~Topic=Common Problems

Of course, Fractint would never stoop to having a "common" problem.  These
notes describe some, ahem, "special situations" which come up occasionally
and which even we haven't the gall to label as "features".

Fractint (alas!) is still a DOS program. It runs well under windows, but there
can be problems. Here are some tips from some expert users.

Jay Hill's Windows tips:\ 
  For starters, make sure the DOS window properties are set to 
  'Misc | Always suspend' = off." Unless you want the task to stop when it 
  does not have focus. Also, you can put the Idle Sensitivity to high. Make 
  settings on any other DOS windows you have open according to what they 
  should be (or what you prefer). 

  If your DOS window is full screen, press Alt-Enter to make it a Window window. 
  Then click on the MSDOS icon in the upper left. WARNING, don't do this in a
  high res graphics mode or in text mode (sometimes). The safest is F3 320x200 
  graphics mode. Windows likes that mode. If you have a high res image, hit 'X'
  to get the text screen and then Alt-ENTER to get the DOS Windows window... 
  POW...your task will likely die. So ... don't do that: 

  Some DOS programs eat up to 50% or 80% CPU time just sitting watching for 
  key strokes. Clearly, these should be suspended when they don't have the 
  focus. A simple DOS prompt, I have found, eats little time. 

  Some web pages eat lots of time (watching prompt boxes) while others eat 
  little (plain text or graphics with no links). 

  It has been noted here before, you can make a shortcut to Fractint.exe and 
  tailor its properties. I use in the program tab: command line: 

  FRACTINT.EXE textsafe=save sound=off\

  Under the screen tab: Usage: Full screen. 
  Under Misc: Allow screen saver=off. 

  You should coordinate your DOS windows according to what you are doing. 
  I often change the settings for a short time, just to do some other task. 

Damien M. Jones Windows tips:\
  This is what works for me. Your mileage may vary. 

  Create a shortcut to FRACTINT.EXE, right-click it, choose Properties. 
  On the Memory tab: set all five drop-downs to "Auto". 
  On the Screen tab: choose Full-screen and Fast ROM emulation, leave 
  Dynamic memory allocation OFF. 
  Under the Misc tab: turn OFF Allow screen saver. Turn ON Always suspend. 
  Set the Idle sensitivity to about 1/4, closest to Low. 

  In the SSTOOLS.INI file, put textsafe=save on a line by itself in the 
  [fractint] section. (This helps preserve your screen when you switch away 
  from FractInt, but only works if Always suspend is turned ON.) 

  Having more than 8M of RAM helps too, that way Windows and FractInt aren't 
  fighting over the same memory. 

Hang during startup:\
  There might be a problem with Fractint's video detection logic and your
  particular video adapter. Try running with "fractint adapter=xxx" where
  xxx is cga, ega, egamono, mcga, or vga.  If "adapter=vga" works, and you
  really have a SuperVGA adapter capable of higher video modes, there are
  other "adapter=" options for a number of SuperVGA chipsets - please see
  the full selection in {Video Parameters} for details.  If this solves the
  problem, create an SSTOOLS.INI file with the "adapter=xxx" command in it
  so that the fix will apply to every run.\
  Another possible cause:  If you install the latest Fractint in say
  directory "newfrac", then run it from another directory with the command
  "\\newfrac\\fractint", *and* you have an older version of fractint.exe
  somewhere in your DOS PATH, a silent hang is all you'll get.  See the
  notes under the "Cannot find FRACTINT.EXE message" problem for the reason.\
  Another possibility: try one of the "textsafe" parameter choices
  described in {Video Parameters}.

Scrambled image when returning from a text mode display:\
  If an image which has been partly or completely generated gets partly
  destroyed when you return to it from the menu, help, or the information
  display, please try the various "textsafe" parameter options - see
  {Video Parameters} for details.  If this cures the problem, create
  an SSTOOLS.INI file with the "textsafe=xxx" command so that the fix will
  apply to every run.

"Holes" in an image while it is being drawn:\
  Little squares colored in your "inside" color, in a pattern of every
  second square of that size, in solid guessing mode, both across and down
  (i.e., 1 out of 4), are
  a symptom of an image which should be calculated with more conservative
  periodicity checking than the default.  See the Periodicity parameter
  under {Image Calculation Parameters}.

Black bar at top of screen during color cycling on 8086/8088 machines:\
  (This might happen intermittently, not every run.)\
  "fractint cyclelimit=10" might cure the problem.  If so, increase
  the cyclelimit value (try increasing by 5 or 10 each time) until the
  problem reappears, then back off one step and add that cyclelimit value
  to your SSTOOLS.INI file.

Other video problems:

  If you are using a VESA driver with your video adapter, the first thing
  to try is the "vesadetect=no" parameter. If that fixes the problem, add
  it to your SSTOOLS.INI file to make the fix permanent.

  It may help to explicitly specify your type of adapter - see the
  "adapter=" parameter in {Video Parameters}.

  We've had one case where a video driver for Windows does not work
  properly with Fractint.  If running under Windows, DesqView, or some
  other layered environment, try running Fractint directly from DOS to see
  if that avoids the problem.\
  We've also had one case of a problem co-existing with "386 to the Max".

  We've had one report of an EGA adapter which got scrambled images in
  all modes until "textsafe=no" was used (see {Video Parameters}).

  Also, see {Video Adapter Notes} for information
  about enhanced video modes - Fractint makes only limited attempts to
  verify that a video mode you request is actually supported by your
  adapter.
~OnlineFF

Other Hangs and Strange Behavior:\
  We've had some problems (hangs and solid beeps) on an FPU equipped
  machine when running under Windows 3's enhanced mode.  The only ways
  around the problem we can find are to either run the Fractint image
  involved outside Windows, or to use the DOS command "SET NO87=nofpu"
  before running Fractint.  (This SET command makes Fractint ignore your
  fpu, so things might be a lot slower as a result.)

Insufficient memory:\
  Fractint requires a fair bit of memory to run.  Most machines with at
  least 640k (ok sticklers, make that "PC-compatible machines") will have
  no problem.  Machines with 512k and machines with many TSR utilities
  and/or a LAN interface may have problems.  Some Fractint features
  allocate memory when required during a run.  If you get a message about
  insufficient memory, or suspect that some problem is due to a memory
  shortage, you could try commenting out some TSR utilities in your
  AUTOEXEC.BAT file, some non-critical drivers in your CONFIG.SYS file, or
  reducing the BUFFERS parameter in your CONFIG.SYS.
~OnlineFF

"Cannot find FRACTINT.EXE" message:\
  Fractint is an overlayed program - some parts of it are brought from
  disk into memory only when used.  The overlay manager needs to know
  where to find the program.  It must be named FRACTINT.EXE (which it is
  unless somebody renamed it), and you should either be in the directory
  containing it when you start Fractint, or that directory should be in
  your DOS PATH.

"File FRACTINT.CFG is missing or invalid" message:\
  You should either start Fractint while you are in the directory
  containing it, or should have that directory in your DOS PATH variable.
  If that isn't the problem, maybe you have a FRACTINT.CFG file from an
  older release of Fractint lying around? If so, best rename or delete it.
  If that isn't the problem either, then the FRACTINT.CFG included in the
  FRAINT.EXE release file has probably been changed or deleted. Best
  reinstall Fractint to get a fresh copy.
~OnlineFF

Some other program doesn't like GIF files created by Fractint:\
  Fractint generates nice clean GIF89A spec files, honest! But telling
  this to the other program isn't likely to change its mind. Instead, try
  an option which might get around the problem: run Fractint with the
  command line option "gif87a=yes" and then save an image. Fractint will
  store the image in the older GIF87A format, without any fractal
  parameters in it (so you won't be able to load the image back into
  Fractint and zoom into it - the fractal type, coordinates, etc. are not
  stored in this older format), and without an "aspect ratio" in the GIF
  header (we've seen one utility which doesn't like that field.)

Disk video mode performance:\
  This won't be blindingly fast at the best of times, but there are things
  which can slow it down and can be tuned.  See {"Disk-Video" Modes}
  for details.

Sound card output isn't working:\
  If you get the message "FM hardware not present" when trying to switch on
  output from your sound card then check that the drivers you installed with
  the card have set the BLASTER environment variable. To do this go to a DOS
  prompt and type SET, this command will list a bunch of lines like this:\
  VARIABLE=VALUE\
  ANOTHERVARIABLE=ANOTHER VALUE\
  \
  one of these should look like:\
  BLASTER=A:220 I:5 D:3\
  or similar, it's the A: entry that's important. If you don't have the variable
  set then try putting the line:\
  SET BLASTER=A:220\
  in your autoexec.bat file, though be warned that if your sound hardware isn't
  compatable or has its base i/o address set differently to the 220H, then unexpected
  things may happen as fractint tries to write to hardware that isn't there.

  If you get no warning message but still can't hear anything then try to
  alter the volume of your card's output using whatever utility came with the
  card. For windows 95 doubleclick on the small loudspeaker icon on your
  task bar and play with the sliders, you may have to go to the mixer properties
  menu and enable the control for the FM output to appear, this may be called
  'synthesizer', 'FM', 'midi', or 'legacy' depending on your hardware.
  Also fractint is unlikely to be able to continue sounding notes when running
  in the background under windows 95, so you'll need to keep switching back and
  forth until things are set right.
  


;
;
;
~Topic=Fractals and the PC
;
; empty for document, present just so we can reference the subject

~Format-,Doc-

    A Little History:
       { Before Mandelbrot }
       { Who Is This Guy, Anyway? }

    A Little Code:
       { Periodicity Logic }
       { Limitations of Integer Math (And How We Cope) }
       { Arbitrary Precision and Deep Zooming }
       { The Fractint "Fractal Engine" Architecture }

    A Little Math:
       { Summary of Fractal Types }
       { Inside=bof60|bof61|zmag|fmod|period|atan }
       { Inside=epscross|startrail }
       { Finite Attractors }
       { Trig Identities }
       { Quaternion and Hypercomplex Algebra }
~Format+,Doc+
;
;
~Topic=Before Mandelbrot

Like new forms of life, new branches of mathematics and science don't
appear from nowhere. The ideas of fractal geometry can be traced to the
late nineteenth century, when mathematicians created shapes -- sets of
points -- that seemed to have no counterpart in nature.  By a wonderful
irony, the "abstract" mathematics descended from that work has now turned
out to be MORE appropriate than any other for describing many natural
shapes and processes.

Perhaps we shouldn't be surprised.  The Greek geometers worked out the
mathematics of the conic sections for its formal beauty; it was two
thousand years before Copernicus and Brahe, Kepler and Newton overcame the
preconception that all heavenly motions must be circular, and found the
ellipse, parabola, and hyperbola in the paths of planets, comets, and
projectiles.

In the 17th century Newton and Leibniz created calculus, with its
techniques for "differentiating" or finding the derivative of functions --
in geometric terms, finding the tangent of a curve at any given point.
True, some functions were discontinuous, with no tangent at a gap or an
isolated point. Some had singularities: abrupt changes in direction at
which the idea of a tangent becomes meaningless. But these were seen as
exceptional, and attention was focused on the "well-behaved" functions
that worked well in modeling nature.

Beginning in the early 1870s, though, a 50-year crisis transformed
mathematical thinking. Weierstrass described a function that was
continuous but nondifferentiable -- no tangent could be described at any
point. Cantor showed how a simple, repeated procedure could turn a line
into a dust of scattered points, and Peano generated a convoluted curve
that eventually touches every point on a plane. These shapes seemed to
fall "between" the usual categories of one-dimensional lines, two-
dimensional planes and three-dimensional volumes. Most still saw them as
"pathological" cases, but here and there they began to find applications.

In other areas of mathematics, too, strange shapes began to crop up.
Poincare attempted to analyze the stability of the solar system in the
1880s and found that the many-body dynamical problem resisted traditional
methods. Instead, he developed a qualitative approach, a "state space" in
which each point represented a different planetary orbit, and studied what
we would now call the topology -- the "connectedness" -- of whole families
of orbits. This approach revealed that while many initial motions quickly
settled into the familiar curves, there were also strange, "chaotic"
orbits that never became periodic and predictable.

Other investigators trying to understand fluctuating, "noisy" phenomena --
the flooding of the Nile, price series in economics, the jiggling of
molecules in Brownian motion in fluids -- found that traditional models
could not match the data. They had to introduce apparently arbitrary
scaling features, with spikes in the data becoming rarer as they grew
larger, but never disappearing entirely.

For many years these developments seemed unrelated, but there were
tantalizing hints of a common thread. Like the pure mathematicians' curves
and the chaotic orbital motions, the graphs of irregular time series often
had the property of self-similarity: a magnified small section looked very
similar to a large one over a wide range of scales.
;
;
~Topic=Who Is This Guy\, Anyway?

While many pure and applied mathematicians advanced these trends, it is
Benoit Mandelbrot above all who saw what they had in common and pulled the
threads together into the new discipline.

He was born in Warsaw in 1924, and moved to France in 1935. In a time when
French mathematical training was strongly analytic, he visualized problems
whenever possible, so that he could attack them in geometric terms.  He
attended the Ecole Polytechnique, then Caltech, where he encountered the
tangled motions of fluid turbulence.

In 1958 he joined IBM, where he began a mathematical analysis of
electronic "noise" -- and began to perceive a structure in it, a hierarchy
of fluctuations of all sizes, that could not be explained by existing
statistical methods. Through the years that followed, one seemingly
unrelated problem after another was drawn into the growing body of ideas
he would come to call fractal geometry.

As computers gained more graphic capabilities, the skills of his mind's
eye were reinforced by visualization on display screens and plotters.
Again and again, fractal models produced results -- series of flood
heights, or cotton prices -- that experts said looked like "the real
thing."

Visualization was extended to the physical world as well. In a provocative
essay titled "How Long Is the Coast of Britain?" Mandelbrot noted that the
answer depends on the scale at which one measures: it grows longer and
longer as one takes into account every bay and inlet, every stone, every
grain of sand. And he codified the "self-similarity" characteristic of
many fractal shapes -- the reappearance of geometrically similar features
at all scales.

First in isolated papers and lectures, then in two editions of his seminal
book, he argued that many of science's traditional mathematical models are
ill-suited to natural forms and processes: in fact, that many of the
"pathological" shapes mathematicians had discovered generations before are
useful approximations of tree bark and lung tissue, clouds and galaxies.

Mandelbrot was named an IBM Fellow in 1974, and continues to work at the
IBM Watson Research Center. He has also been a visiting professor and
guest lecturer at many universities.
;
;
~Topic=Periodicity Logic

The "Mandelbrot Lake" in the center of the M-set images is the traditional
bane of plotting programs. It sucks up the most computer time because it
always reaches the iteration limit -- and yet the most interesting areas
are invariably right at the edge the lake.
(See {The Mandelbrot Set} for a description of the iteration process.)

Thanks to Mark Peterson for pointing out (well, he more like beat us over
the head until we paid attention) that the iteration values in the middle
of Mandelbrot Lake tend to decay to periodic loops (i.e., Z(n+m) == Z(n),
a fact that is pointed out on pages 58-61 of "The Beauty of Fractals"). An
intelligent program (like the one he wrote) would check for this
periodicity once in a while, recognize that iterations caught in a loop
are going to max out, and bail out early.

For speed purposes, the current version of the program turns this checking
algorithm on only if the last pixel generated was in the lake.  (The
checking itself takes a small amount of time, and the pixels on the very
edge of the lake tend to decay to periodic loops very slowly, so this
compromise turned out to be the fastest generic answer).

Try a full M-set plot with a 1000-iteration maximum with any other
program, and then try it on this one for a pretty dramatic proof of the
value of periodicity checking.

You can get a visual display of the periodicity effects if you press
<O>rbits while plotting. This toggles display of the intermediate
iterations during the generation process.  It also gives you an idea of
how much work your poor little PC is going through for you!  If you use
this toggle, it's best to disable solid-guessing first using <1> or <2>
because in its second pass, solid-guessing bypasses many of the pixel
calculations precisely where the orbits are most interesting.

Mark was also responsible for pointing out that 16-bit integer math was
good enough for the first few levels of M/J images, where the round-off
errors stay well within the area covered by a single pixel. Fractint now
uses 16-bit math where applicable, which makes a big difference on non-32-
bit PCs.
;
;
~Topic=Limitations of Integer Math (And How We Cope)

By default, Fractint uses 16-bit and/or 32-bit integer math to generate
nearly all its fractal types. The advantage of integer math is speed: this
is by far the fastest such plotter that we have ever seen on any PC. The
disadvantage is an accuracy limit. Integer math represents numbers like
1.00 as 32-bit integers of the form [1.00 * (2^29)] (approximately
a range of 500,000,000) for the Mandelbrot and Julia sets. Other integer
fractal types use a bitshift of 24 rather than 29, so 1.0 is stored
internally as [1.00 * (2^24)]. This yields accuracy of better than 8
significant digits, and works fine... until the initial values of the
calculations on consecutive pixels differ only in the ninth decimal place.

At that point, if Fractint has a floating-point algorithm handy for that
particular fractal type (and virtually all of the fractal types have one
these days), it will silently switch over to the floating-point algorithm
and keep right on going.  Fair warning - if you don't have an FPU, the
effect is that of a rocket sled hitting a wall of jello, and even if you
do, the slowdown is noticeable.

If it has no floating-point algorithm, Fractint does the best it can: it
switches to its minimal drawing mode, with adjacent pixels having initial
values differing by 1 (really 0.000000002).  Attempts to zoom further may
result in moving the image around a bit, but won't actually zoom.  If you
are stuck with an integer algorithm, you can reach minimal mode with your
fifth consecutive "maximum zoom", each of which covers about 0.25% of the
previous screen. By then your full-screen image is an area less than
1/(10^13)th [\~0.0000000000001] the area of the initial screen.  (If your
image is rotated or stretched very slightly, you can run into the wall of
jello as early as the fourth consecutive maximum zoom.  Rotating or
stretching by larger amounts has less impact on how soon you run into it.)

Think of it this way: at minimal drawing mode, your VGA display would have
to have a surface area of over one million square miles just to be able to
display the entire M-set using the integer algorithms.  Using the
floating-point algorithms, your display would have to be big enough to fit
the entire solar system out to the orbit of Saturn inside it.  So there's
a considerable saving on hardware, electricity and desk space involved
here.  Also, you don't have to take out asteroid insurance.

32 bit integers also limit the largest number which can be stored.  This
doesn't matter much since numbers outside the supported range (which is
between -4 and +4) produce a boring single color. If you try to zoom-out
to reduce the entire Mandelbrot set to a speck, or to squeeze
it to a pancake, you'll find you can't do so in integer math mode.
;
;
~Topic=Arbitrary Precision and Deep Zooming

The zoom limit of Fractint is approximately 10^15 (10 to the fifteenth
power). This limit is due to the precision possible with the computer
representation of numbers as 64 bit double precision data. To give you an
idea of just how big a magnification 10^15 is, consider this. At the scale
of your computer screen while displaying a tiny part of the Mandelbrot set at
the deepest possible zoom, the entire Mandelbrot set would be many millions
of miles wide, as big as the orbit of Jupiter.

Big as this zoom magnification is, your PC can do better using something
called arbitrary precision math. Instead of using 64 bit double precision to
represent numbers, your computer software allocates as much memory as needed
to create a data type supporting as many decimals of precision as you want.

Incorporation of this feature in Fractint was inspired by Jay Hill and his
DEEPZOOM program which uses the shareware MFLOAT programming library.
Several of the Stone Soup programmers noticed Jay's posts in the Internet
sci.fractals newsgroup and began to investigate adding arbitrary precision
to Fractint. High school math and physics teacher Wes Loewer wrote an
arbitrary precision library in both 80x86 assembler and C, and the Stone Soup
team incorporated Wes's library into Fractint. Initially, support was added
for fractal types mandel, julia, manzpower, and julzpower.

Normally, when you reach Fractint's zoom limit, Fractint simply
refuses to let you zoom any more. When using the fractal types that support
arbitrary precision, you will not reach this limit, but can keep on
zooming. When you pass the threshold between double precision and arbitrary
precision, Fractint will dramatically slow down. The <tab> status screen can
be used to verify that Fractint is indeed using arbitrary precision.

Fractals with arbitrary precision are SLOW, as much as ten times slower than
if the math were done with your math coprocessor, and even slower simply
because the zoom depth is greater. The good news, if you want to call it
that, is that your math coprocessor is not needed; coprocessorless machines
can produce deep zooms with the same glacial slowness as machines with
coprocessors!

Maybe the real point of arbitrary precision math is to prolong the "olden"
days when men were men, women were women, and real fractal programmers spent
weeks generating fractals. One of your Stone Soup authors has a large
monitor that blinks a bit when changing video modes--PCs have gotten so fast
that Fractint finishes the default 320x200 Mandelbrot before the monitor can
even complete its blinking transition to graphics mode! Computers are getting
faster every day, and soon a new generation of fractal lovers might forget
that fractal generation is *supposed* to be slow, just as it was in Grandpa's
day when they only had Pentium chips. The solution to this educational
dilemma is Fractint's arbitrary precision feature. Even the newest sexium and
septium machines are going to have to chug for days or weeks at the extreme
zoom depths now possible ...

So how far can you zoom? How does 10^1600 sound--roughly 1600 decimal
digits of precision. To put *this* magnification in perspective, the "tiny"
ratio of 10^61 is the ratio of the entire visible universe to the smallest
quantum effects. With 1600 digits to work with, you can expand an
electron-sized image up to the size of the visible universe, not once but
more than twenty times. So you can examine screen-sized portions of a
Mandelbrot set so large all but a tiny part of it would be vastly farther away
than the billion or so light year limit of our best telescopes.

Lest anyone suppose that we Stone Soupers suffer from an inflated pride over
having thus spanned the Universe, current inflationary cosmological theories
estimate the size of the universe to be unimaginably larger than the
"tiny" part we can see.

Note: many of Fractint's options do not work with arbitrary precision. To
experiment with arbitrary precision at the speedier ordinary magnifications,
start Fractint with the debug=3200 command-line option. With the exception
of mandel and manzpower perturbations, values that would normally be entered
in the Parameters and Coordinates screens need to be entered using the
command-line interface or .par files.  Other known things that do not yet
work with arbitrary precision are: biomorph, decomp, distance estimator,
inversion, Julia-Mandel switch, history, orbit-in-window, and the browse
feature.
;
;
~Topic=The Fractint "Fractal Engine" Architecture

Several of the authors would never ADMIT this, but Fractint has evolved a
powerful and flexible architecture that makes adding new fractals very
easy. (They would never admit this because they pride themselves on being
the sort that mindlessly but happily hacks away at code and "sees if it
works and doesn't hang the machine".)

Many fractal calculations work by taking a rectangle in the complex plane,
and, point by point, calculating a color corresponding to that point.
Furthermore, the color calculation is often done by iterating a function
over and over until some bailout condition is met.
(See {The Mandelbrot Set} for a description of the iteration process.)

In implementing such a scheme, there are three fractal-specific
calculations that take place within a framework that is pretty much the
same for them all.  Rather than copy the same code over and over, we
created a standard fractal engine that calls three functions that may be
bolted in temporarily to the engine.  The "bolting in" process uses the C
language mechanism of variable function pointers.

These three functions are:

   1) a setup function that is run once per image, to do any required
   initialization of variables,

   2) a once-per-pixel function that does whatever initialization has to
   be done to calculate a color for one pixel, and

   3) a once-per-orbit-iteration function, which is the fundamental
   fractal algorithm that is repeatedly iterated in the fractal
   calculation.

The common framework that calls these functions can contain all sorts of
speedups, tricks, and options that the fractal implementor need not worry
about.  All that is necessary is to write the three functions in the
correct way, and BINGO! - all options automatically apply. What makes it
even easier is that usually one can re-use functions 1) and 2) written for
other fractals, and therefore only need to write function 3).

Then it occurred to us that there might be more than one sort of fractal
engine, so we even allowed THAT to be bolted in. And we created a data
structure for each fractal that includes pointers to these four functions,
various prompts, a default region of the complex plane, and various
miscellaneous bits of information that allow toggling between Julia and
Mandelbrot or toggling between the various kinds of math used in
implementation.

That sounds pretty flexible, but there is one drawback - you have to be a
C programmer and have a C compiler to make use of it! So we took it a step
further, and designed a built-in high level compiler, so that you can
enter the formulas for the various functions in a formula file in a
straightforward algebra-like language, and Fractint will compile them and
bolt them in for you!

There is a terrible down side to this flexibility.  Fractint users
everywhere are going berserk. Fractal-inventing creativity is running
rampant. Proposals for new fractal types are clogging the mail and the
telephones.

All we can say is that non-productivity software has never been so potent,
and we're sorry, it's our fault!

Fractint was compiled using Microsoft C 7.0 and Microsoft Assembler 6.0,
using the "Medium" model. Note that the assembler code uses the "C" model
option added to version 5.1, and must be assembled with the /MX or /ML
switch to link with the "C" code. Because it has become too large to
distribute comfortably as a single compressed file, and because many
downloaders have no intention of ever modifying it, Fractint is now
distributed as two files: one containing FRACTINT.EXE, auxiliary files and
this document, and another containing complete source code (including a
.MAK file and MAKEFRAC.BAT).  See {Distribution of Fractint}.
;
;
;
~Topic=Inside=bof60|bof61|zmag|fmod|period|atan
~Format-,Online-

INSIDE=BOF60|BOF61|ZMAG|FMOD|PERIOD|ATAN
~Format+,Online+

Here is an *ATTEMPTED* explanation of what the inside=bof60 and
inside=bof61 options do. This explanation is hereby dedicated to Adrian
Mariano, who badgered it out of us! For the *REAL* explanation, see
"Beauty of Fractals", page 62.

Let p(z) be the function that is repeatedly iterated to generate a fractal
using the escape-time algorithm.  For example, p(z) = z^2+c in the case of
a Julia set. Then let pk(z) be the result of iterating the function p for
k iterations. (The "k" should be shown as a superscript.) We could also
use the notation pkc(z) when the function p has a parameter c, as it does
in our example.  Now hold your breath and get your thinking cap on. Define
a(c) = inf\{|pkc(0)|:k=1,2,3,...}. In English - a(c) is the greatest lower
bound of the images of zero of as many iterations as you like. Put another
way, a(c) is the closest to the origin any point in the orbit starting
with 0 gets. Then the index (c) is the value of k (the iteration) when
that closest point was achieved.  Since there may be more than one,
index(c) is the least such. Got it?  Good, because the "Beauty of
Fractals" explanation of this, is, ahhhh, *TERSE* ! Now for the punch
line. Inside=bof60 colors the lake alternating shades according to the
level sets of a(c).  Each band represents solid areas of the fractal where
the closest value of the orbit to the origin is the same.  Inside=bof61
show domains where index(c) is constant.  That is, areas where the
iteration when the orbit swooped closest to the origin has the same value.
Well, folks, that's the best we can do! Improved explanations will be
accepted for the next edition!

In response to this request for lucidity, Herb Savage offers this explanation
the bof60 and bof61 options:
\
 The picture on page 60 of The Beauty of Fractals shows the distance to\
 origin of the closest point to the origin in the sequence of points\
 generated from a given X,Y coordinate.  The picture on page 61 shows\
 the index (or number) in the sequence of the closest point.\
\
inside=zmag is similar. This option colors inside pixels according to
the magnitude of the orbit point when maxiter was reached, using the formula
color = (x^2 + y^2) * maxiter/2 + 1.

inside=fmod colors inside pixels according to the magnitude of the last orbit
point which is within a set distance from the origin.  Then:\
  color = magnitude * colors / closeprox\
The magnitude used for the comparison is now based on the same calculation as
is used for the bailout test.  The value of closeprox can be varied
interactively.  This feature was contributed by Iain Stirling.

inside=period colors pixels according to the length of their eventual cycle.
For example, points that approach a fixed point have color=1.  Points that
approach a 2-cycle have color=2.  Points that do not approach a cycle during
the iterations performed have color=maxit.  This option works best with a
fairly large number of iterations.

inside=atan colors by determining the angle in degrees the last iterated
value has with respect to the real axis, and using the absolute value.  This
feature should be used with periodicity=0
;
;
;
~Topic=Inside=epscross|startrail
~Format-,Online-

INSIDE=EPSCROSS|STARTRAIL
~Format+,Online+

Kenneth Hooper has written a paper entitled "A Note On Some Internal
Structures Of The Mandelbrot Set" published in "Computers and Graphics", Vol
15, No.2, pp. 295-297.  In that article he describes Clifford Pickover's
"epsilon cross" method which creates some mysterious plant-like tendrils in
the Mandelbrot set. The algorithm is this. In the escape-time calculation of a
fractal, if the orbit comes within .01 of the Y-axis, the orbit is terminated
and the pixel is colored green. Similarly, the pixel is colored yellow if it
approaches the X-axis. Strictly speaking, this is not an "inside" option
because a point destined to escape could be caught by this bailout criterion.

The test distance, 0.01, can now be changed interactively on the <x> screen
and via the proximity=<nnn> command line parameter. A negative value of
the test distance triggers an alternative variation of epsilon cross that
colors the epsilon bands with the iteration; otherwise they are colored 
normally to maintain compatibility.

Hooper has another coloring scheme called "star trails" that involves
detecting clusters of points being traversed by the orbit. A table of tangents
of each orbit point is built, and the pixel colored according to how many
orbit points are near the first one before the orbit flies out of the cluster.
This option looks fine with maxiter=16, which greatly speeds the calculation.

Both of these options should be tried with the outside color fixed
(outside=<nnn>) so that the "lake" structure revealed by the algorithms can be
more clearly seen. Epsilon Cross is fun to watch with boundary tracing turned
on - even though the result is incorrect it is interesting! Shucks - what
does "incorrect" mean in chaos theory anyway?!
;
;
;
~Topic=Finite Attractors
~Format-,Online-

FINITE ATTRACTORS
~Format+,Online+

Many of Fractint's fractals involve the iteration of functions of complex
numbers until some "bailout" value is exceeded, then coloring the
associated pixel according to the number of iterations performed.  This
process identifies which values tend to infinity when iterated, and gives
us a rough measure of how "quickly" they get there.

In dynamical terms, we say that "Infinity is an Attractor", as many
initial values get "attracted" to it when iterated.  The set of all points
that are attracted to infinity is termed The Basin of Attraction of
Infinity.  The coloring algorithm used divides this Basin of Attraction
into many distinct sets, each a single band of one color, representing all
the points that are "attracted" to Infinity at the same "rate".  These
sets (bands of color) are termed "Level Sets" - all points in such a set
are at the same "Level" away from the attractor, in terms of numbers of
iterations required to exceed the bailout value.

Thus, Fractint produces colored images of the Level Sets of the Basin of
Attraction of Infinity, for all fractals that iterate functions of Complex
numbers, at least.  Now we have a sound mathematical definition of what
Fractint's "bailout" processing generates, and we have formally introduced
the terms Attractor, Basin of Attraction, and Level Set, so you should
have little trouble following the rest of this section!

For certain Julia-type fractals, Fractint can also display the Level Sets
of Basins of Attraction of Finite Attractors.  This capability is a by-
product of the implementation of the MAGNETic fractal types, which always
have at least one Finite Attractor.

This option can be invoked by setting the "Look for finite attractor"
option on the <Y> options screen, or by giving the "finattract=yes"
command-line option.

Most Julia-types that have a "lake" (normally colored blue by default)
have a Finite Attractor within this lake, and the lake turns out to be,
quite appropriately, the Basin of Attraction of this Attractor.

The "finattract=yes" option (command-line or <Y> options screen)
instructs Fractint to seek out and identify a possible Finite Attractor
and, if found, to display the Level Sets of its Basin of Attraction, in
addition to those of the Basin of Attraction of Infinity.  In many cases
this results in a "lake" with colored "waves" in it;  in other cases there
may be little change in the lake's appearance.

For a quick demonstration, select a fractal type of LAMBDA, with a
parameter of 0.5 + 0.5i.  You will obtain an image with a large blue lake.
Now set "Look for finite attractor" to 1 with the "Y" menu.
The image will be re-drawn
with a much more colorful lake.  A Finite Attractor lives in the center of
one of the resulting "ripple" patterns in the lake - turn the <O>rbits
display on to see where it is - the orbits of all initial points that are
in the lake converge there.

Fractint tests for the presence of a Finite Attractor by iterating a
Critical Value of the fractal's function.  If the iteration doesn't bail
out before exceeding twice the iteration limit, it is almost certain that
we have a Finite Attractor - we assume that we have.

Next we define a small circle around it and, after each iteration, as well
as testing for the usual bailout value being exceeded, we test to see if
we've hit the circle. If so, we bail out and color our pixels according to
the number of iterations performed.  Result - a nicely colored-in lake
that displays the Level Sets of the Basin of Attraction of the Finite
Attractor.  Sometimes !

First exception: This does not work for the lakes of Mandel-types.  Every
point in a Mandel-type is, in effect, a single point plucked from one of
its related Julia-types.  A Mandel-type's lake has an infinite number of
points, and thus an infinite number of related Julia-type sets, and
consequently an infinite number of finite attractors too.  It *MAY* be
possible to color in such a lake, by determining the attractor for EVERY
pixel, but this would probably treble (at least) the number of iterations
needed to draw the image.  Due to this overhead, Finite Attractor logic
has not been implemented for Mandel-types.

Secondly, certain Julia-types with lakes may not respond to this
treatment, depending on the parameter value used.  E.g., the Lambda Set
for 0.5 + 0.5i responds well; the Lambda Set for 0.0 + 1.0i does not - its
lake stays blue.  Attractors that consist of single points, or a cycle of
a finite number of points are ok.  Others are not.  If you're into fractal
technospeak, the implemented approach fails if the Julia-type is a
Parabolic case, or has Siegel Disks, or has Herman Rings.

However, all the difficult cases have one thing in common - they all have
a parameter value that falls exactly on the edge of the related Mandel-
type's lake.  You can avoid them by intelligent use of the Mandel-Julia
Space-Bar toggle:  Pick a view of the related Mandel-type where the center
of the screen is inside the lake, but not too close to its edge, then use
the space-bar toggle.  You should obtain a usable Julia-type with a lake,
if you follow this guideline.

Thirdly, the initial implementation only works for Julia-types that use
the "Standard" fractal engine in Fractint.  Fractals with their own
special algorithms are not affected by Finite Attractor logic, as yet.

Finally, the finite attractor code will not work if it fails to detect
a finite attractor.  If the number of iterations is set too low, the finite
attractor may be missed.

Despite these restrictions, the Finite Attractor logic can produce
interesting results.  Just bear in mind that it is principally a bonus
off-shoot from the development of the MAGNETic fractal types, and is not
specifically tuned for optimal performance for other Julia types.

(Thanks to Kevin Allen for the above).

There is a second type of finite attractor coloring, which is selected
by setting "Look for Finite Attractor" to a negative value.  This colors
points by the phase of the convergence to the finite attractor,
instead of by the speed of convergence.

For example, consider the Julia set for -0.1 + 0.7i, which is the three-lobed
"rabbit" set.  The Finite Attractor is an orbit of length three; call these
values a, b, and c.  Then, the Julia set iteration can converge to one of
three sequences: a,b,c,a,b,c,..., or b,c,a,b,c,..., or c,a,b,c,a,b,...
The Finite Attractor phase option colors the interior of the Julia set with
three colors, depending on which of the three sequences the orbit converges
to.  Internally, the code determines one point of the orbit, say "a", and
the length of the orbit cycle, say 3.  It then iterates until the sequence
converges to a, and then uses the iteration number modulo 3 to determine the
color.

;
;
~Topic=Trig Identities
~Online-

TRIG IDENTITIES

~Online+
The following trig identities are invaluable for coding fractals that use
complex-valued transcendental functions of a complex variable in terms of
real-valued functions of a real variable, which are usually found in
compiler math libraries. In what follows, we sometimes use "*" for
multiplication, but leave it out when clarity is not lost. We use "^" for
exponentiation; x^y is x to the y power.
~Format-

   (u+iv) + (x+iy) = (u+x) + i(v+y)
   (u+iv) - (x+iy) = (u-x) + i(v-y)
   (u+iv) * (x+iy) = (ux - vy) + i(vx + uy)
   (u+iv) / (x+iy) = ((ux + vy) + i(vx - uy)) / (x^2 + y^2)

   e^(x+iy) = (e^x) (cos(y) + i sin(y))

   log(x+iy) = (1/2)log(x^2 + y^2) + i(atan(y/x) + 2kPi)
      for k = 0, -1, 1, -2, 2, ...
      (The log function refers to log base e, or ln. The expression
       atan(y/x) is an angle between -pi and pi in the quadrant containing
       (x,y) implemented in C as the atan2() function.)

   z^w = e^(w*log(z))

   sin(x+iy)  = sin(x)cosh(y) + i cos(x)sinh(y)
   cos(x+iy)  = cos(x)cosh(y) - i sin(x)sinh(y)
   tan(x+iy)  = sin(x+iy) / cos(x+iy)
   sinh(x+iy) = sinh(x)cos(y) + i cosh(x)sin(y)
   cosh(x+iy) = cosh(x)cos(y) + i sinh(x)sin(y)
   tanh(x+iy) = sinh(x+iy) / cosh(x+iy)
   cosxx(x+iy) = cos(x)cosh(y) + i sin(x)sinh(y)
     (cosxx is present in Fractint to provide compatibility with a bug
     which was in its cos calculation before version 16)

                     sin(2x)               sinh(2y)
   tan(x+iy) = ------------------  + i------------------
               cos(2x) + cosh(2y)     cos(2x) + cosh(2y)

                 sin(2x) - i*sinh(2y)
   cotan(x+iy) = --------------------
                  cosh(2y) - cos(2x)

                    sinh(2x)                sin(2y)
   tanh(x+iy) = ------------------ + i------------------
                cosh(2x) + cos(2y)    cosh(2x) + cos(2y)

                  sinh(2x) - i*sin(2y)
   cotanh(x+iy) = --------------------
                   cosh(2x) - cos(2y)

   asin(z) = -i * log(i*z+sqrt(1-z*z))
   acos(z) = -i * log(z+sqrt(z*z-1))
   atan(z) = i/2* log((1-i*z)/(1+i*z))

   asinh(z) = log(z+sqrt(z*z+1))
   acosh(z) = log(z+sqrt(z*z-1))
   atanh(z) = 1/2 * log((1+z)/(1-z))

   sqr(x+iy) = (x^2-y^2) + i*2xy
   sqrt(x+iy) = sqrt(sqrt(x^2+y^2)) * (cos(atan(y/x)/2) + i sin(atan(y/x)/2))

   ident(x+iy) = x + iy
   conj(x+iy) = x - iy
   recip(x+iy) = (x-iy) / (x^2+y^2)
   flip(x+iy) = y + ix
   zero(x+iy) = 0
   one(x+iy)  = 1
   cabs(x+iy) = sqrt(x^2 + y^2)
   floor(x+iy) = floor(x) + i*floor(y)
   ceil(x+iy)  = ceil(x) + i*ceil(y)
   trunc(x+iy) = trunc(x) + i*trunc(y)
   round(x+iy) = round(x) + i*round(y)

~Format+
Fractint's definitions of abs(x+iy) and |x+iy| below are non-standard.
Math texts define both absolute value and modulus of a complex number to
be the same thing.  They are both equal to cabs(x+iy) as defined above.
~Format-

   |x+iy| = x^2 + y^2
   abs(x+iy) = sqrt(x^2) + i sqrt(y^2)
;
;
;
~Topic=Quaternion and Hypercomplex Algebra

Quaternions are four dimensional generalizations of complex numbers.
They almost obey the familiar field properties of real numbers, but
fail the commutative law of multiplication, since x*y is not generally
equal to y*x.

Quaternion algebra is most compactly described by specifying the rules
for multiplying the basis vectors 1, i, j, and k. Quaternions form a
superset of the complex numbers, and the basis vectors 1 and i are the
familiar basis vectors for the complex algebra. Any quaternion q can be
represented as a linear combination q = x + yi + zj + wk of the basis
vectors just as any complex number can be written in the form z = a + bi.
~Format-

Multiplication rules for quaternion basis vectors:
ij =  k jk =  i ki = j
ji = -k kj = -i ik = -j
ii = jj = kk = -1
ijk = -1

Note that ij = k but ji = -k, showing the failure of the commutative law.
The rules for multiplying any two quaternions follow from the behavior
of the basis vectors just described. However, for your convenience, the
following formula works out the details.

Let q1 = x1 + y1i + z1j + w1k and q2 = x2 + y2i + z2j + w2k.
Then q1q2 = 1(x1x2 - y1y2 - z1z2 - w1w2) +
            i(y1x2 + x1y2 - w1z2 + z1w2) +
            j(z1x2 + w1y2 + x1z2 - y1w2) +
            k(w1x2 + z1y2 - y1z2 + x1w2)
            
~Format+
Quaternions are not the only possible four dimensional supersets of the
complex numbers. William Rowan Hamilton, who discovered quaternions in 1843,
considered the alternative called the hypercomplex number system.
Unlike quaternions, the hypercomplex numbers satisfy the commutative law of
multiplication. The law which fails is the field property that states that
all non-zero elements of a field have a multiplicative inverse. For a non-zero
hypercomplex number h, the multiplicative inverse 1/h does not always exist.

As with quaternions, we will define multiplication in terms of the basis
vectors 1, i, j, and k, but with subtly different rules.
~Format-

Multiplication rules for hypercomplex basis vectors:
ij = k  jk = -i ki = -j
ji = k  kj = -i ik = -j
ii = jj = -kk = -1
ijk = 1

Note that now ij = k and ji = k, and similarly for other products of pairs
of basis vectors, so the commutative law holds.

Hypercomplex multiplication formula:
Let h1 = x1 + y1i + z1j + w1k and h2 = x2 + y2i + z2j + w2k.
Then  h1h2 =  1(x1x2 - y1y2 - z1z2 + w1w2) +
              i(y1x2 + x1y2 - w1z2 - z1w2) +
              j(z1x2 - w1y2 + x1z2 - y1w2) +
              k(w1x2 + z1y2 + y1z2 + x1w2)

As an added bonus, we'll give you the formula for the reciprocal.

Let det = [((x-w)^2+(y+z)^2)((x+w)^2+(y-z)^2)]
Then 1/h =   1[ x(x^2+y^2+z^2+w^2)-2w(xw-yz)]/det +
             i[-y(x^2+y^2+z^2+w^2)-2z(xw-yz)]/det +
             j[-z(x^2+y^2+z^2+w^2)-2y(xw-yz)]/det +
             k[ w(x^2+y^2+z^2+w^2)-2x(xw-yz)]/det

~Format+
A look at this formula shows the difficulty with hypercomplex numbers.
In order to calculate 1/h, you have to divide by the quantity
det = [((x-w)^2+(y+z)^2)((x+w)^2+(y-z)^2)]. So when this quantity is zero,
the multiplicative inverse will not exist.

Hypercomplex numbers have an elegant generalization of any unary
complex valued function defined on the complex numbers. First, note that
hypercomplex numbers can be represented as a pair of complex numbers in the
following way.
~Format-
Let h = x + yi + zj + wk.
    a = (x-w) + i(y+z)
    b = (x+w) + i(y-z)
~Format+
The numbers a and b are complex numbers. We can represent h as the pair of
complex numbers (a,b). Conversely, if we have a hypercomplex number given
to us in the form (a,b), we can solve for x, y, z, and w. The solution to
~Format-
   c = (x-w) + i(y+z)
   d = (x+w) + i(y-z)
is
   x = (real(c) + real(d))/2
   y = (imag(c) + imag(d))/2
   z = (imag(c) - imag(d))/2
   w = (real(d) - real(c))/2
~Format+
We can now, for example, compute sin(h). First compute the two complex numbers
a and b as above, then set c = sin(a) and d = sin(b) where sin() is the
complex version of the sin function. Now use the equations above to solve for
x, y, z, and w in terms of c and d. The hypercomplex number (x,y,z,w) thus
obtained is sin(h).

The beauty of this is that it really doesn't make any difference what
function we use. Instead of sin, we could have used cos, sinh, ln, or z^2.
Using this technique, Fractint can create 3-D fractals using the formula
h' = fn(h) + c, where "fn" is any of the built-in functions. Where fn is
sqr(), this is the famous mandelbrot formula, generalized to four dimensions.

For more information, see _Fractal Creations, Second Edition_ by Tim Wegner
and Bert Tyler, Waite Group Press, 1993.
;
;
;
~Topic=GIF Save File Format

Since version 5.0, Fractint has had the <S>ave-to-disk command, which
stores screen images in the extremely compact, flexible .GIF (Graphics
Interchange Format) widely supported on CompuServe. Version 7.0 added the
<R>estore-from-disk capability.

Until version 14, Fractint saved images as .FRA files, which were a
non-standard extension of the then-current GIF87a specification.  The
reason was that GIF87a did not offer a place to store the extra
information needed by Fractint to implement the
<R> feature -- i.e., the parameters that let you keep zooming, etc.
as if the restored file had just been created in this session.
The .FRA format worked with all of the popular GIF decoders that we
tested, but these were not true GIF files. For one thing,
information after the GIF terminator (which is where we put the extra info)
has the potential to confuse the
online GIF viewers used on CompuServe. For another, it is the opinion of
some GIF developers that the addition of this extra information violates
the GIF87a spec. That's why we used the default filetype .FRA instead.

Since version 14, Fractint has used a genuine .GIF format, using the
GIF89a spec - an upwardly compatible extension of GIF87a, released by
CompuServe on August 1 1990.
This new spec allows the
placement of application data within "extension blocks".
In version 14 we changed our default savename extension from .FRA
to .GIF.

There is one significant advantage to the new GIF89a format compared to
the old GIF87a-based .FRA format for Fractint purposes:  the new .GIF
files may be uploaded to the CompuServe graphics forums fractal information
intact.  Therefore anyone downloading a Fractint image from CompuServe will
also be downloading all the information needed to regenerate the image.

Fractint can still read .FRA files generated by
earlier versions.  If for some reason you wish to save files in the older
GIF87a format, for example because your favorite GIF decoder has not yet
been upgraded to GIF89a, use the command-line parameter "GIF87a=yes".
Then any saved files will use the original GIF87a format without any
application-specific information.

An easy way to convert an older .FRA file into true .GIF format suitable
for uploading is something like this at the DOS prompt:\
    FRACTINT MYFILE.FRA SAVENAME=MYFILE.GIF BATCH=YES\
Fractint will load MYFILE.FRA, save it in true .GIF format as MYFILE.GIF,
and return to DOS.

GIF and "Graphics Interchange Format" are trademarks of CompuServe
Incorporated, an H&R Block Company.
;
;
;
~Topic=Using Fractint With a Mouse
; This topic is online only.

~FormatExclude-
Left Button:   Brings up and sizes the Zoom Box.   While holding down the
               left button, push the mouse forward to shrink the Zoom Box,
               and pull it back to expand it.
               Double-clicking the left button performs the Zoom.

Right Button:  While holding the right button held down, move the mouse
               from side to side to 'rotate' the Zoom Box.  Move the mouse
               forward or back to change the Zoom Box color.
               Double-clicking the right button performs a 'Zoom-Out'.

Both Buttons:  (or the middle button, if you have three of them) While
               holding down both buttons, move the mouse up and down to
               stretch/shrink the height of the Zoom Box, or side to side
               to 'squish' the Zoom Box into a non-rectangular shape.

Zoom and Pan using the mouse typically consists of pushing in the left
button, sizing the zoom box, letting go of the button, panning to the
general area, then double-clicking the left button to perform the Zoom.

For details of a special mode that takes advantage of the mouse when
palette editing see {Freestyle mode tutorial}
;
;
;
~Topic=Selecting a video mode when loading a file, Label=HELPLOADFILE
; This topic is only online, context-sensitive.
~Format-

The most suitable video modes for the file are listed first.

The 'err' column in the video mode information indicates:
  blank  mode seems perfect for this image
  v      image smaller than screen, will be loaded in a <v>iew window
  c      mode has more colors than image needs
  *      a major problem, one or more of the following is also shown:
   C     mode has too few colors
   R     image larger than screen, Fractint will reduce the image, possibly
         into a <v>iew window, and maybe with aspect ratio a bit wrong
   A     mode has the wrong shape of pixels for this image
;
;
;
~Topic=Distribution of Fractint
~Format-,Online-

DISTRIBUTION OF FRACTINT
~Format+,Online+

New versions of FRACTINT are uploaded to the Fractint developer's web site at
www.fractint.org, and make
their way to other systems from that point.  FRACTINT is available as
two self-extracting archive files - FRAINT.EXE (executable & documentation)
and FRASRC.EXE (source code).

The latest developer's version can also be found at www.fractint.org.

Many other sites tend to carry
these files shortly after their initial release (although sometimes
using different naming conventions).  Look for frainnn.zip (executable
package) and frasrnnn.zip (source), where nnn is the release number. Major
releases with two digit numbers have names such as fraintnn.zip and
frasrcnn.zip.

On the Internet, try the Noel Giffin's Spanky Fractal Database. Using a
Web browser, go to: \
http://spanky.triumf.ca/pub/fractals/programs/ibmpc/frainxxx.zip\
where xxx is the release number.

Via FTP, login to spanky.triumf.ca as ANONYMOUS, and change directories
to [pub.fractals.programs.ibmpc], then download frainxxx.zip. (The directory
syntax is in VAX format.)

The X Windows port of Fractint was written by Ken Shirriff and is available
via FTP from http://spanky.triumf.ca/pub/fractals/programs/unix/XFRACTxxx.zip\
where xxx is the Xfractint release number.  Developer's versions of
Xfractint are available at the Fractint developer's web site.
;
;
~Topic=Contacting the Authors
~Format-,Online-

CONTACTING THE AUTHORS
~Format+,Online+
Communication between the authors for development of the next version of
Fractint takes place in the fractint mailing list.



The following authors have agreed to the distribution of their addresses.
Usenet/Internet/Bitnet/Whatevernet users can reach CIS users directly if
they know the user ID.

Postal addresses are listed below
so that you have a way to send bug reports
and ideas to the Stone Soup team.

Please understand that we receive a lot of
mail, and because of the demands of volunteer work on Fractint as well as
our professional responsibilities, we are generally unable to answer it all.
Several of us have reached the point where we can't answer any conventional
mail. We *do* read and enjoy all the mail we receive, however. If you need a
reply, the best thing to do is use email, which we are generally able to
answer, or better yet, leave a message on the fractint list.

Tim Wegner now runs a mailing list for fractint users to swap ideas and par
data, you can subscribe by emailing mailman@mailman.xmission.com with
the line:\
subscribe fractint\
as the sole content of the message, you'll receive further instructions by
return of email.

(This address list has been pruned of names of folks we haven't heard
from in a while. If your name has been removed, and you'd like to be listed,
just let us know and we'll add it back.)

~FF
Current main authors:

~Format-

Timothy Wegner          twegner@fractint.org
4714 Rockwood
Houston, TX 77004
(713) 747-7543

Jonathan Osuch          josuch@fractint.org
2110 Northview Drive
Marion, IA  52302

Contributing authors' addresses (in alphabetic order).

Prof Jm Collard-Richard jmc@math.ethz.ch

Paul de Leeuw
16 Sunset Street
Wyoming
NSW 2250
Australia
+61-2-8293-3055 (Work)
+61-2-4329-0870 (Home)


~OnlineFF
Sylvie Gallet           sylvie.gallet1@libertysurf.fr

Lee H. Skinner          skinner@thuntek.net 
P.O. Box 14944
Albuquerque, NM  87191
(505) 293-5723

Bert Tyler              bert.tyler@oef.com
Tyler Software 
124 Wooded Lane
Villanova, PA 19085
(610) 525-5478

~Format+
;
;
~Topic=The Stone Soup Story
~Format-,Online-
THE STONE SOUP STORY
~Format+,Online+

Once upon a time, somewhere in Eastern Europe, there was a great famine.
People jealously hoarded whatever food they could find, hiding it even
from their friends and neighbors. One day a peddler drove his wagon into a
village, sold a few of his wares, and began asking questions as if he
planned to stay for the night.

[No!  No!  It was three Russian Soldiers! - Lee Crocker]\
[Wait!  I heard it was a Wandering Confessor! - Doug Quinn]\
[Well *my* kids have a book that uses Russian Soldiers! - Bert]\
[Look, who's writing this documentation, anyway? - Monte]\
[Ah, but who gets it *last* and gets to upload it? - Bert]\

"There's not a bite to eat in the whole province," he was told. "Better
keep moving on."

"Oh, I have everything I need," he said. "In fact, I was thinking of
making some stone soup to share with all of you." He pulled an iron
cauldron from his wagon, filled it with water, and built a fire under it.
Then, with great ceremony, he drew an ordinary-looking stone from a velvet
bag and dropped it into the water.

By now, hearing the rumor of food, most of the villagers had come to the
square or watched from their windows. As the peddler sniffed the "broth"
and licked his lips in anticipation, hunger began to overcome their
skepticism.

"Ahh," the peddler said to himself rather loudly, "I do like a tasty stone
soup. Of course, stone soup with CABBAGE -- that's hard to beat."

Soon a villager approached hesitantly, holding a cabbage he'd retrieved
from its hiding place, and added it to the pot. "Capital!" cried the
peddler. "You know, I once had stone soup with cabbage and a bit of salt
beef as well, and it was fit for a king."

The village butcher managed to find some salt beef...and so it went,
through potatoes, onions, carrots, mushrooms, and so on, until there was
indeed a delicious meal for all. The villagers offered the peddler a great
deal of money for the magic stone, but he refused to sell and traveled on
the next day. And from that time on, long after the famine had ended, they
reminisced about the finest soup they'd ever had.

                                ***

That's the way Fractint has grown, with quite a bit of magic, although
without the element of deception. (You don't have to deceive programmers
to make them think that hours of painstaking, often frustrating work is
fun... they do it to themselves.)

It wouldn't have happened, of course, without Benoit Mandelbrot and the
explosion of interest in fractal graphics that has grown from his work at
IBM. Or without the example of other Mandelplotters for the PC. Or without
those wizards who first realized you could perform Mandelbrot calculations
using integer math (it wasn't us - we just recognize good algorithms when
we steal--uhh--see them).  Or those graphics experts who hang around the
CompuServe PICS forum and keep adding video modes to the program.  Or...
~Doc-
(continued in {A Word About the Authors})
~Doc+
;
;
~Topic=A Word About the Authors
~Format-,Online-

A WORD ABOUT THE AUTHORS
~Format+,Online+

Fractint is the result of a synergy between the main authors, many
contributors, and published sources.  All of the main authors have
had a hand in many aspects of the code.  However, each author has certain
areas of greater contribution and creativity.  Since there is not room in
the credits screen for the contributions of the main authors, we list these
here to facilitate those who would like to communicate with us on
particular subjects.

Main Authors of Version 19 and later.

BERT TYLER is the original author of Fractint.  He wrote the "blindingly
fast" 386-specific 32 bit integer math code and the original video mode
logic. Bert made Stone Soup possible, and provides a sense of direction when
we need it. His forte is writing fast 80x86 assembler, his knowledge of a
variety of video hardware, and his skill at hacking up the code we send him!

Bert has a BA in mathematics from Cornell University.  He has been in
programming since he got a job at the computer center in his sophomore
year at college - in other words, he hasn't done an honest day's work in
his life.  He has been known to pass himself off as a PC expert, a UNIX
expert, a statistician, and even a financial modeling expert.  He is
currently masquerading as an independent PC consultant, supporting the PC-
to-Mainframe communications environment at NIH.  If you sent mail from the
Internet to an NIH staffer on his 3+Mail system, it was probably Bert's
code that mangled it during the Internet-to-3+Mail conversion.  He also
claims to support the MS-Kermit environment at NIH. Fractint is Bert's
first effort at building a graphics program.

TIM WEGNER contributed the original implementation of palette animation,
and is responsible for most of the 3D mechanisms.  He provided
the main outlines of the "StandardFractal" engine and data structures, and is
accused by his cohorts of being "obsessed with options". One of Tim's main
interests is the use of four dimensional algebras to produce fractals.
Tim served as team coordinator for version 19, and integrated Wes Loewer's
arbitrary precision library into Fractint.

Tim has BA and MA degrees in mathematics from Carleton College and the
University of California Berkeley.  He worked for 7 years overseas as a
volunteer, doing things like working with Egyptian villagers building
water systems. Since returning to the US in 1982, he has written shuttle
navigation software, a software support environment prototype, and
supported strategic information planning, all at NASA's Johnson Space
Center. After a two-year stint at full-time writing, he's back at NASA
developing shuttle navigation software.

JONATHAN OSUCH started throwing pebbles into the soup around version 15.0
with a method for simulating an if-then-else structure using the formula
parser.  He has contributed the fn||fn fractal types, the built-in bailout
tests, the increase in both the maximum iteration count and bailout value,
and bug fixes too numerous to count. Jonathan worked closely with Robin
Bussell to implement Robin's browser mechanism in Fractint.

Jonathan has a B.S. in Physics from the University of Dubuque and a B.S. in
Computer Science from Mount Mercy College, both in Iowa.  He is currently
working as a consultant in the nuclear power industry.

WES LOEWER first got his foot in the Stone Soup door by writing fast
floating point assembler routines for Mandelbrot, Julia, and Lyapunov
fractals.  He also rewrote the boundary trace algorithms and added the
frothybasin fractal.  His most significant contribution is the addition of
the arbitrary precision library which allows Fractint to perform
incredibly deep zooms.

Wes has a B.S. in Physics from Wheaton College in Illinois.  He also holds
an M.S. in Physics and an M.Ed. in Education from Texas A&M University.
Wes teaches physics and math at McCullough High School in The Woodlands,
Texas where his pupils inspire him to keep that sense of amazement that
students get when they understand a physical or mathematical principle for
the first time.  Since he uses Fractint to help teach certain mathematical
principles, he's one of the few folks who actually gets to use Fractint on
the job.  Besides his involvement with Fractint, Wes is the author of
WL-Plot, an equation graphing program, and MatCalc, a matrix calculator
program.

GEORGE MARTIN first became known to Fractint users when he brought
a modicum of order to the chaotic world of formula postings with his
release of the Orgform program and formula compilation. George added
IF..ELSE to the formula parser language for version 19.6. Among his other
contributions are the ability to include formula, ifs, and lsystem entries
in .par files, the scrolling of text in the <z> and F2 screens, and
new autokey commands.

George received an A.B. in Economics from Dartmouth College and a J.D from
the University of Michigan. When not playing with Fractint, he practices
law in a small village about 40 miles northwest of Detroit.


ROBIN BUSSELL began contributing to fractint in rudimentary fashion with the
autologmap routine and has been producing more and more complex interface
enhancements as he gets better at what he refers to as 'this C programming lark'
He is always grateful for the help the rest of the team have given in smoothing
the rough edges of the ingredients he adds to the soup and regards the evolver
feature as his greatest achievement to date.

Robin had far too much fun at college in London to actually get any qualifications there
and has since worked his way up from a workshop job fixing computers back in
the final days of CPM, via some interesting work with Transputers ( an innovative
British cpu that was designed to run in massively parallel configurations, and
made a very good Mandlebrot set calculating machine when a few dozen or more were set
to the task) , through to his current position of senior engineer for a third
party suppport company where he spends his time travelling the south west of Britain
sorting out peoples IT problems. Anyone wishing to offer him interesting work
in anything to do with computers can find a CV at:
http://web.ukonline.co.uk/robin.b2/rbcv.htm

When not playing with computers Robin likes to relax by experimenting with kite
powered traction and can often be found hurtling around the local beaches on the end of
a few square metres of fabric and carbon fibre in various configurations.
;
;
~Topic=Other Fractal Products
(Forgive us, but we just *have* to begin this section with a plug for
*our* fractal products even though the books are now out of print and 
hard to find ...)

Several of Fractint's programmers have written books about fractals,
Fractint, and Winfract (the Windows version of Fractint).
The book about Fractint is Fractal Creations Second Edition (1994 Waite
Group Press, ISBN # 1-878739-34-4).  The book about Winfract is The Waite
Group's Fractals for Windows (1992 Waite Group Press, ISBN # 1-878739-25-5).
These books are now very hard to find, so if you see one, better get it!
~Format-
Fractal Creations Second Edition includes:
 o A guided tour of Fractint.
 o A detailed manual and reference section of commands.
 o A tutorial on fractals.
 o A reference containing tips, explanations, and examples of parameters
   for all the Fractals generated by Fractint/Winfract.
 o Secrets on how the programs work internally.
 o Spectacular color plate section.
 o A CD containing Fractint and Xfract source and executable, and over a
   thousand spectacular fractal images.
 o A complete copy of the source code with a chapter explaining how the
   program works.
~Format+
;
;
~OnlineFF

  Several Fractint enthusiasts are selling Fractal CDs.  One of the best
  are called "Fractal Dimensions" by Lee Skinner. Highly recommended original 
  artwork in a variety of graphics formats.

  You can receive the "Fractal Dimensions CD" by sending $19.95US +
  $5.00 S&H (or $10.00 S&H outside USA) to

     Lee H. Skinner
     P. O. Box 14944
     Albuquerque, NM  87191-4944
     USA


~OnlineFF
Michael Peters and Randall Scott have written a fractal program called HOP
based on the Martin orbit fractals. This program is much narrower than
Fractint in the kind of thing that it does, but has many more animation
effects and makes a great screen saver. Michael sent us the algorithms for
the chip, quadruptwo, and threeply fractal types to give us a taste. The
file is called HOPZIP.EXE in LIB 9 of CompuServe's DIGART forum.

Michael has also written a handy utility called PARTOBAT which creates
a batch file for generating all the images in a Fractint PAR file.

George Martin has written a useful formula file organizing program,
distributed as ORGFRM.ZIP, which also includes a comprehensive collection
of formulas. More than 15,000 formulas written by Fractint users are
included in the compilation, arranged alphabetically by name, and with
the original source file shown in each formula by comment, making the
compilation an encyclopedia of formulas written for Fractint. The most
recent version of ORGFRM.ZIP is available at the CompuServe site, and
at Noel Giffin's web page described in the next paragraph. The package
includes a utility program, orgform.exe, which copies the formulas of
".frm" files into the compilation, skipping those formulas which are
already included in the compilation. Formula writers are urged to consult
this compilation in order to avoid giving a new formula an existing formula
name. George can be reached at [76440,1143], or ggmartin@compuserve.com.

Robin Bussell has knocked together a windows front end for fractint that makes
rendering images from par information recieved in email a simple operation.
Download it for free from http://web.ukonline.co.uk/robin.b2/pastengo.htm
or check compuserve for pastengo.zip


Noel Giffin (noel@triumf.ca), maintains a terrific web page for Fractint and
fractals in general at spanky.triumf.ca. Highly recommended. His pages on
arbitrary precision gleaned from sci.fractals and corresponence are required
reading.
;
;
;
~Topic=Bibliography

BARNSLEY, Michael: "Fractals Everywhere," Academic Press, 1988.

DAVENPORT, Clyde: "A Hypercomplex Calculus with Applications to Relativity",
   ISBN 0-9623837-0-8. This self-published expansion of Mr. Davenport's
   Master's thesis makes the case for using hypercomplex numbers rather than
   quaternions. This book provided the background for Fractint's
   implementation of hypercomplex fractals.

DEWDNEY, A. K., "Computer Recreations" columns in "Scientific American" --
   8/85, 7/87, 11/87, 12/88, 7/89.

FEDER, Jens: "Fractals," Plenum, 1988.\
   Quite technical, with good coverage of applications in fluid
   percolation, game theory, and other areas.

GLEICK, James: "Chaos: Making a New Science," Viking Press, 1987.\
   The best non-technical account of the revolution in our understanding
   of dynamical systems and its connections with fractal geometry.
~OnlineFF

MANDELBROT, Benoit: "The Fractal Geometry of Nature," W. H. Freeman & Co.,
   1982.\
   An even more revised and expanded version of the 1977 work. A rich and
   sometimes confusing stew of formal and informal mathematics, the
   prehistory of fractal geometry, and everything else. Best taken in
   small doses.

MANDELBROT, Benoit: "Fractals: Form, Chance, and Dimension," W. H. Freeman
   & Co., 1977.\
   A much revised translation of "Les objets fractals: forme, hasard, et
   dimension," Flammarion, 1975.

PEITGEN, Heinz-Otto & RICHTER, Peter: "The Beauty of Fractals," Springer-
   Verlag, 1986.\
   THE coffee-table book of fractal images, knowledgeable on computer
   graphics as well as the mathematics they portray.

PEITGEN, Heinz-Otto & SAUPE, Ditmar: "The Science of Fractal Images,"
   Springer-Verlag, 1988.\
   A fantastic work, with a few nice pictures, but mostly filled with
   *equations*!!!

PICKOVER, Clifford: "Computers, Pattern, Chaos, and Beauty," St. Martin's
   Press, 1990.\

SCHROEDER, Manfred: "Fractals, Chaos, Power Laws," W. H. Freeman
   & Co., 1991.\

WEGNER, Timothy: "Image Lab, Second Edition", Waite Group Press, 1995.\
   Learn how to create fractal animations, fractal
   RDS stereo images, and how to use Fractint with other image creation
   and processing tools such as Piclab, POV-Ray and Polyray ray tracers.

WEGNER, Timothy & TYLER, Bert: "Fractal Creations, Second Edition" Waite
   Group Press, 1993\
   This is the definitive Fractint book. Spectacular color plate section,
   totally new and expanded fractal type descriptions, annotated PAR files,
   source code secrets, and a CD filled to the brim with spectacular fractals.

WEGNER, Timothy, TYLER, Bert, PETERSON, Mark, and Branderhorst, Pieter:
   "Fractals for Windows," Waite Group Press, 1992.\
   This book is to Winfract (the Windows version of Fractint) what
   "Fractal Creations" is to Fractint.
;
;
~Topic=Other Programs

~Label=@FDESIGN
FDESIGN, by Doug Nelson (CIS ID 70431,3374) - a freeware IFS fractal
generator available from CompuServe in DIGART LIB 9, and probably on your
local BBS.  This program requires a VGA adapter and a Microsoft-compatible
mouse, and a floating point coprocessor is highly recommended.  It
generates IFS fractals in a *much* more intuitive fashion than Fractint.
It can also (beginning with version 3.0) save its IFS formulas in
Fractint-style .IFS files.

BRAZIL Fractal Generator by David CHARDONNET - A freeware IFS fractal 
generator and animator for Windows 95 and Win/NT 4.0 shares common fractal
description language for sharing fractals between fractint and this program. 
It can be downloaded from his website:\ 
   http://www.geocities.com/CapeCanaveral/Lab/1837/index_a.html
 
FRACTINT SCREEN SAVER by Thore Berntsen. This freeware screen saver works with
Fractint. Check this out at:\
   http://home.sol.no/\~thbernt/fintsave.htm\

~OnlineFF
The following pieces of software are pretty old now, but for now these 
references are still here. Winfract is based on on old version of Fractint
and is no longer maintained.

WINFRACT. Bert Tyler has ported Fractint to run under Windows 3.  The same
underlying code is used, with a Windows user interface.  Winfract has
almost all the functionality of Fractint - the biggest difference is the
absence of a zillion weird video modes.  Fractint for DOS will continue to
be the definitive version.  Winfract is available from CompuServe in
DIGART LIB 9, as WINFRA.ZIP (executable) and WINSRC.ZIP (source).

PICLAB, by Lee Crocker - a freeware image manipulation utility available
from CompuServe in PICS Lib 10, as PICLAB.EXE.  PICLAB can do very
sophisticated resizing and color manipulation of GIF and TGA files.  It
can be used to reduce 24 bit TGA files generated with the Fractint
"lightname" option to GIF files.

~OnlineFF
~Label=@ACROSPIN
ACROSPIN, by David Parker - An inexpensive commercial program that reads
an object definition file and creates images that can be rapidly rotated
in three dimensions. The Fractint "orbitsave=yes" option creates files that
this program can read for orbit-type fractals and IFS fractals. Contact:
   David Parker                         801-966-2580\
   P O Box 26871                        800-227-6248\
   Salt Lake City, UT  84126-0871

;
;

~Topic=Sound Controls, label=HELPSOUND

On this screen, accessed by hitting ctrl-F, you'll find a few parameters
that you recognise from the 'x' menu handily gathered together, plus a few
new ones. You can find the descriptions for the basic parms over at the
{Sound Parameters} help.

The newer parameters now control whether fractint uses the PC speaker for
sound, as in previous versions, or the output of a sound card, or both.

Your present Sound card may boast all manner of gizmos and wotnots but fractint may
well not be able to take advantage of them, this is simply due to our not including
umpteen different drivers for all the different cards. Instead it just uses a
simple approach that at least allows you to use multimedia speakers for
the various noises of which fractint is capable.

This DOS version of fractint uses the current lowest common denominator
hardware among the variety of sound cards available, the yamaha OPL-3 FM synthesizer
chipset which is found in most sound cards from the original AdLib, through
the various soundblasters from creative labs, to the numerous cards that
emulate them. 

The OPL-3 chipset has within it several 'voices', each capable of generating
sound independently of the others, and with a variety of controllable
parameters. See {Advanced Sound Controls} for details.

The sound card volume control given here will be overridden by any volume
control applications that come with your OS, such as the windows 95 mixer
control panel. Also, depending on your sound card and software, the output
of the OPL-3 chipset may be controlled by a slider named 'synth', 'midi',
 or possibly 'legacy'... if in doubt, experiment :-)

The other parameter that needs explaining here is note pitch quantisation.
When this is enabled, tones that are to be played are first rounded to the
nearest note on the western even tempered scale (i.e. the notes that you find
on a piano) as opposed to the full spectrum of frequencies. The
{Advanced Sound Controls} screen also has a facility to restrict the notes
played further so that you can produce tunes in a particular key, if you're
so inclined.
;
;
~Topic=Advanced Sound Controls, Label=HELPMUSIC
The soundcard output from fractint is a tad more versatile than the simple
tones of the PC speaker. This comes into its own when playing sounds based
on fractal orbits, producing results from haunting chordal pulses through to
unearthly arpeggios.

The voices used to generate notes on the sound card have variable {Envelopes}
and can be played polyphonically so we have three parameters to vary the
sounds produced:

POLYPHONY=nn\
This controls how many different note are allowed to sound at once, voices are
assigned cyclically as notes are played: i.e. after the first orbit is
calculated a frequency is assigned to the first voice and that note is
triggered on. Fractint then waits for one orbitdelay period, calculates the
next orbit, assigns a frequency to the second voice, and triggers it on. 
This continues until the number of voices sounding is equal to the polyphony
value whereupon the first selected voice is triggered off and the note allowed
to decay.
That probably all sounds horrendously complex but just think of it as playing
the organ, holding down each new note for as long as possible but with the
polyphony value controlling how many fingers you have.

WAVETYPE=nn\
~Format-
 WaveForm 0: Sine       WaveForm 1: Half-Sine
  | /^\\                   | /^\\         /^\\
  |/   \\       /          |/   \\       /   \\
 �/�����\\�����/��        �|������-----��������
  |      \\   /            |
  |       \\_/             |

 WaveForm 2: Abs-Sine   WaveForm 3: Pulse-Sine
  | /^\\   /^\\             | /^|         /^|
  |/   \\ /   \\ /          |/  |        /  |
 �|��������������        �|����-------��������
  |                       |

 WaveForm 4: Sine - even periods only
  | /^\\                     /^\\
  |/   \\                   /   \\
 �|�����\\������-----------������\\�������
  |      \\   /                   \\   /
  |       \\_/                     \\_/

 WaveForm 5: Abs-Sine - even periods only
  | /^\\   /^\\               /^\\   /^\\
  |/   \\ /   \\             /   \\ /   \\
 �|������������-----------��������������
  |

 WaveForm 6: Square
  |-----�     �-----�     �-----�     �-
  |     |     |     |     |     |     |
 �|�����|�����|�����|�����|�����|�����|��
  |     |     |     |     |     |     |
  |     �-----�     �-----�     �-----�

 WaveForm 7: Derived Square
  |          |\\                |\\
  |         |  \\              |  \\
 �|--__����|����\\------__����|����\\------
  |    \\  |              \\  |
  |     \\|                \\|
~Format+

ATTACK=nn\
This controls the time taken for a note to hit full volume after being
triggered on. Low values give a punchy percussive sound while long values
give a softer bowed sound. If attack time is set too long and orbitdelay is
low then notes are played too fast to ever achieve any volume and the net
result is low or non existent output. To put it another way, if orbitdelay
is low then this value should be low also.

DECAY=nn\
This controls the time taken for a note to die down to the sustain level. 
Setting this time too low may produce a rhythmic click between notes.  
The attack and decay values don't allow much fine control.

SUSTAIN=nn\
This controls the volume level at which a note is held.

SRELEASE=nn\
This controls the delay in time for releasing a note.  A release value of
15 seems to equate to 'never let the note release' on the machine used to
develop the sound card drivers.  But, as ever, with other manufacturer's
emulations your mileage may vary.

VOLUME=nn\
It is possible to adjust the volume of an FM synth card.  This has no effect
on the PC speaker.

ATTENUATE=none|low|mid|high\
On an FM synth card it is possible to attenuate the high pitched notes.  The
default is none.  The low value attenuates at 1.5 dB/octave, the mid at
3.0 dB/octave, and the high at 6.0 dB/octave.

SCALEMAP=nn/nn/nn/...\
The scale map list is a way of controlling which notes are played by fractint
and only has any effect if note quantisation is switched on in the basic sound
parameters screen. It can be very useful when the polyphony is up and the chords
you're getting are more like dischords. :-)

The way it works is this: When a sound is played with frequency quantisation on
its frequency is rounded to the nearest 'proper' note on the musical scale,
this note number is then looked up in the scale map table and substituted by the
note indicated in that entry of the table.
The end result of this is that, for instance, using this sequence of numbers
as a scale map: \
2,2,4,4,4,7,7,9,9,11,11,11 \
Will ensure that fractint uses only the black notes on the keyboard, just the
sharps and flats for a vaguely oriental feel (to my western ears anyway :-) ).

The above probably appears to be sheer gobbledegook at first reading, sorry,
but if you keep at it you'll unlock this powerful feature for keeping your
fractals melodic.  (Unless you're totally turned on by microtonal frequencies
in which case forget all this quantisation nonsense and tune in to the true
sound of chaos!)

The passes=1 setting ({Drawing Method}) almost always works best with sound. 
~Topic=Envelopes

Here's some more information about the concept of a note envelope for those 
unfamiliar with sound synthesis terminology, it's all about how the dynamics 
of a note are defined (i.e the way in which the loudness changes during the 
life of a note)

 Graph of a note's volume during it's life cycle:
  
    /\\______                     /\\_______           \
__/          \\_____ ... _______/          \\_________ \
0011111111110000000 ... 0000000111111111110000000000 \
  A  D  S   R                  AAADSSSSSSSR          \

The string of 0's and 1's represents the keyon/off state of the voice, 1's
indicate the key being held down. The attack, decay, sustain, and release
portions of the envelope are represented by ADSR, this is what happens:

When the note is first triggered on the volume rises to peak volume at a
rate determined by the attack value.

Once at the full level the decay period starts and the volume dies down (at
a rate set by the decay value) to a level that is set by the sustain
value.

The note continues to sound at this volume until triggered off (the 'key'
is released) whereupon it dies down to zero volume at the release rate.

And so on.  Now, with the current voice assignment method, while orbits are
being generated continuously, timing looks like this (with four note polyphony 
in this example)

   Voice:\
     1 *111.....*111....\
     2 .*111.....*111...\
     3 ..*111.....*111..\
     4 ...*111.....*111.\
     5 ....*111.....*111\
     6 .....*111.....*11\
     7 ......*111.....*1\
     8 .......*111.....*\
     9 ........*111.....\
orbit: 12345678901234567\

Where:\
      . = key off (silent or releasing note)\
      * = note assigned a value and triggered on, attack, decay, sustain phase
          begins\
      1 = note held on, you'll notice that above there are only ever four
          notes held on at any one time, though more than four may be sounding
          if there is a long release value.\
;
;
~Topic=Revision History

  Please select one of:

      {Version 20}

      {Version 19}

      {Version 18}

      {Version 17}

      {Version 16}

      {Version 15}

      {Versions 12 through 14}

      {Versions  1 through 11}
;
~Topic=Version 20

Version 20 (9/99) New features include:

The new Fractal Evolver by Robin Bussell. This feature randomly perturbs 
  fractal parameters in a user-controlled way, letting you see a screen
  full of postage-stamp variations of a fractal. See 
  {=HELPEVOL Parameter explorer/evolver}

New sound routines from Robin Bussell.  Now <ctrl-f> brings up a menu for
  changing the sounds made by Fractint.  The sound= prompt can now look like
  this: sound=off|beep|x|y|z/pc|fm/quant. See {Sound Parameters}

New 32767 x 32767 (32K) pixel limit. Removed the 2048 pixel limit for the size
  of fractals. You can now define disk video modes larger than 2048 x 2048. 

Added the experimental synchronous orbits (a.k.a. SOI) "fractal witchcraft" 
  algorithm invoked using passes=s. This algorithm optimizes the computation of very 
  deeply zoomed fractals by calculating parallel orbits, and subdividing 
  when the orbits break formation. See {Drawing Method}

Other new features and changes include:

When resuming in pass=1, the calculation is now restarted at the last X value,
  instead of at the beginning of the row. 

Fixed browser so browsing images won't make the current image non-resumable.

During an image save to disk, the 's' key is now ignored.

Added Humberto Baptista's Epsilon Cross variation. It is triggered with a 
  negative proximity. With a positive proximity value, the result should 
  be backwards compatable. This assumes no one has made images with a 
  negative proximity.

Changed the internal orbitdelay timer to use a new microsecond timer.
  Changed the logic for controlling sound and orbit speed to make
  it less machine dependent. Use debug=4020 to invoke the old timing
  logic.

Modified autologmap so that it ignores symmetry.  

Made the sound= prompts and batch output match the docs.  

Made the colors= information put into PARs the last item in the PAR.

Added capability for makepar command to detect viewwindows and add to
  PAR file.

Turned off view windows when the window is either too large or too small.

Added an auto calc feature for the final aspect ratio if it is set to zero 
  and the x and y sizes are specified.  

Fixed corners drift of integer fractals by disabling the logic that attempts
   to keep the aspect fixed when zooming. 

The <g> command no longer runs the backwards() routines unless
  debug=98. 

Added tangent domain protection to integer version of popcorn that
  prevents the "PI box" artifact. Brutal but works.

~OnlineFF
Generalized popcorn and popcornjul. There's a lot of possibility in
  these new variations. The function variables are remembered as long 
  as you stay within the popcorn family, otherwise they are set to
  defaults. The integer version has an artifact in the F3 mode, probably
  due to tan() being undefined.

Included contributions from Humberto Baptista. These include Pickover's
  Latoocarfian fractal type, as well as a passes=d[iffusion] option. 

The parser colors variable is now initialized to 256.

Fixed problem with the floating point Unity fractal type.  

Added Chuck Ebbert's parser speedup.  

Added checks for inside, outside, biomorph, and fillcolor entries larger
  than the number of colors.

Added fix so that showorbit= can be turned off by restarting Fractint
  with <INS>.

Adapted the browser so it would work with arbitrary precision images.

Added cpu/fpu detection for 486 and up.

Fixed the slow down of palette reset caused by slowing down color cycling.

Fixed inside=zmag and =fmod for arbitrary precision.

More mandel/julia FPU speedup by assembling the > 8087 code without the
  emulator fixups.  This was also used to speedup the FPU parser code.

The mandel/julia optimizations are a combination of contributions from
  Rees Acheson (author of MANDELB), Damien Jones, Agner Fog,
  Terje Mathisen, Thomas Jentzsch, and Daniele Paccaloni.  Although
  it would be hard to identify any one person's contribution, they all
  played a great part in the pentium optimizations.

Added inside=fmod and inside=atan. The inside=atan option should only be 
  used with periodicity=0.

Fixed a bug in loaddac() routine caused because bios doesn't zero top 8
  entries when resetting the dac.

Added two new features to <b> command. You can now specify "only" at
   the "Record colors?", and added a maxlinelen field to specify how
   wide the parameter file can be.

Added support for maps to makepar command. Try something like:\
   fractint map=lyapunov makepar=mymaps

Improved color map compression in PAR files. Debug=910 uses old method, 
   otherwise uses Sylvie Gallet's fix. Debug=920 uses lossless
   compression for critical use.

Removed a longstanding but unintended row limit of the encoder which
  resulted in an "interrupted" message when saving long (> 5000 rows) files.

Fixed bug with LodRealPwr in formula parser.

Speedkey now works with unsorted lists. 

Numbers in sound001.txt file names now increment.

Added new based data type PFCODE which is a pointer to FCODE. This saves
   memory with the array of parser error messages.

Fixed bug that caused lockup when extended memory is used without any
  expanded memory. 

Fixed a bug in the spacing of file names in the file selection menu.

Added Rich Thomson's Xfractint fixes for Silicon Graphics. 

Fixed Julia pointer bug.

Fixed a bug that caused the zoom box coordinates to be used if a doodad was
  changed with a zoom box on the screen.

Formula type and inversion now work with large images. Fractint now
   does everything simplgifd does - make an appropriate diskvideo
   mode, then load and save a MIG!! 

Fixed a long standing bug in the popcorn fractal type and added backwards
  compatibility.  Revised the popcorn type docs to clarify that when the
  view window is used, it is possible to see orbits outside the "box".

Fixed a bug that was causing garbage to be read when a non-Fractint GIF
  image was read.

Replaced the lzw logic with code based on the UNIX compress. This should 
  eliminate very rare but very frustrating encoder problems.

Added a function one() to formula parser, to complement ident() and zero().
  The new function returns (1,0), and, like ident() and zero(), is only
  available as a choice for fn1, fn2, fn3 or fn4.

Disabled symmetry for synchronous orbits.

Moved encoder default color palettes from near memory to overlayed data.

Changed the grid lookups to a function. Fixed diskvideo viewwindows bug.
  Moved zoom box function out of assembler to c. 

Changed the direction of single color cycling when in color cycling mode.

Added command line option orgfrmdir=[directory path]. When used, Fractint's
  search for formulas will make a final check of the appropriate Orgform
  compilation file in the specified directory (e.g. for a formula with the
  name "abc", the only file searched in the specified directory will
  be _a.frm). This feature will significantly reduce the time taken to
  find a formula for users of the compilation.

  For more about the Orgform compilation, see { Other Fractal Products }.

Added a new minstack=<nnnn> command. Default value is 1100. This is
  the minimum number of bytes returned by the stackavail() function
  required in order to do another SOI recursion. People who get bad SOI
  results at high resolutions should increase this value until the
  symptoms go away. 

Fixed the FPUatan bug that has been in the code in calmanfp.asm
  since it was written.  It turns out that the major problem was that the FPU
  stack was being overrun. 

Rewrote the Mandelbrot FPU code.  Fixed the FPU versions of inside= real,
  imag, mult, and summ.  Incremented the version number so the fix could
  be backwards compatible.

Added symmetry to Escher-Julia type. 

Editpal changes from Andrew McCarthy.  Removed IIT coprocessor support.

Parser changes: New code is only used to determine which functions
  and variables will appear at top of "z" screen for a formula. Variable
  names in fomrulas must now start with a letter or "_". Error checking
  of formulas expanded. Formulas in Orgform compilation caught by the new
  error checking have been rewritten.

Fixed bug which appeared when an image entry and a formula in a .par file
  had the same name.

Added support for formula type to SPACE Mandelbrot/Julia toggle. Implemented
  using new ismand parser constant.

Added incremental redraw of images when maxiter is increased.  This works on
  completed images that use inside=color.  None of the other inside=
  options are supported.
  
~Topic=Version 19

Version 19.6 (5/97) new features include:

Added new fractal types {=HT_ESCHER escher_julia} and {=HT_VL volterra-lotka}
  courtesy Michael Sargent.

Expanded formula parser capability to recognize "if..else" flow control
  instructions. The format of an "if block" of instructions is:
         IF(boolean)
            statements
         ELSEIF(boolean) [any number of these are permitted in a block]
            statements
         ELSE            [if used, only one is permitted in a block]
            statements
         ENDIF
  Note that ELSEIF() does not require a separate ENDIF. Each branching
  instruction must be a separate formula statement, separated from other
  statements by a comma or an end of line. There is a limit of 200 branching
  instructions per formula (ELSEIF counts as two branching instructions).
  Unlimited nesting is permitted; each ELSEIF, ELSE, and ENDIF relates to
  the immediately preceding "non endif'ed" IF. An IF() and its ENDIF cannot
  traverse the end of the initialization section of the formula.

Added tutorials to the distribution package: Bradley
  Beacham's basic formula tutorial, Sylvie Gallet's PHC and PTC formula
  tutorial, and George Martin's tutorial on the new if..else feature
  of the formula parser. Required reading for formula writers.

Added text scrolling capability in <z> and F2 screens. Scroll keys for
  the <z> screen:
         CTRL+DOWN_ARROW    Move screen down one line
         CTRL+UP_ARROW      Move screen up one line
         CTRL+RIGHT_ARROW   Move screen right one column
         CTRL+LEFT_ARROW    Move screen left one column
         CTRL+PAGE_DOWN     Move screen down one view screen
         CTRL+PAGE_UP       Move screen up one view screen
         CTRL+HOME          Go to beginning of entry
         CTRL+END           Go to end of entry

  Direction keys without the CONTROL key depressed maintain their current
  roles in moving the cursor in the entry prompt boxes.

  In the F2 screen, the same scrolling is available; the CONTROL key
  does not need to be depressed.

Added capability to place ifs, formula, and lsys entries in PAR files.
  If not found in the file named in the parameter entry, formulas, ifs, and
  lsystem entries called for in entries are looked for in the .par file
  itself. The referenced entry must have the appropriate prefix in the
  PAR file as follows:\

       formulas  frm:\
       lsystem   lsys:\
       ifs       ifs:\

  for example:\

  frm:mandel \{\
    z=c=pixel:\
    z = z*z + c\
    |z| < 4\
  \}\

  The prefix is an identifier, not part of the name itself. Thus, the
  parameter in the image entry would read "formulaname=mandel". The
  formulafile= parameter need not, and probably should not, name the
  PAR file itself - the search of the PAR file is automatic.

  Formulas, ifs, and lsys entries in a PAR file will not be shown on the
  menu screen for the PAR file, and are accessible only in connection with
  running the parameter entry which calls for the formula. Also, PAR
  files are not searched when looking for a formula, ifs, or lsystem entry in
  connection with restoring a .gif file. You will need to copy these entries
  from the PAR file into .frm, .ifs, and .l files as applicable (taking
  care, of course, to delete the identifier prefixes) in order to make
  general use of them.

Added command line option fastrestore=yes|no. Default is NO. When YES,
  causes viewwindows to be set to NO before each restore, so that otherwise
  normal gifs will not be drawn at the reduced aspect when viewwindows was
  previously set to YES; and bypasses the warning which is displayed when a
  restore is to be viewed in a video mode other than the one at which the gif
  was saved. Combined with askvideo=no, all restores will automatically be
  made at the user's default video mode. This feature will be helpful when
  cycling through a group of gifs in autokey mode.

Ctrl-Right used in file selection screens now skips over directory listings,
  and if the cursor is on the last file, moves the cursor to the first file.
  This makes possible uninterrupted cycling in autokey mode. The keyword for
  this keystroke in a .key file is CTRL_RIGHT.\
~OnlineFF
  The following additional keystrokes were also implemented:\

       Ctrl-Left (autokey symbol "CTRL_LEFT")\
       Ctrl-Down ("CTRL_DOWN")\
       Ctrl-Up   ("CTRL_UP")\
       Ctrl-Home ("CTRL_HOME")\
       Ctrl-End  ("CTRL_END")\

   Run the following .key file with command line parameters fastrestore=yes
   and askvideo=no (and, if you don't set your video mode in sstools.ini,
   video=[your standard video mode]) and your coworkers will get a continuous
   display of the .gif files in your default .gif directory when you go to
   lunch (come on, we know you have Fractint on your hard drive at work):

         "r"
          MORE:
          ENTER
          CALCWAIT
          WAIT 30
          "R"
          CTRL_RIGHT
          GOTO MORE

Added four new lsystem types to fractint.l.

When palette editing mode is entered, the original palette is now stored
  in the area associated with F2.

Reduced the fractint.cfg resolution limit to 2x2 pixels.

Fixed bug which caused a lockup when ranges= was used with maxit >= 32767.

Fixed arbitrary precision and decoder crashes.

Fixed an entry display scrolling bug.

Fixed the integer mode frothy basin "censored" bug.

Added backwards compatibility for inside=startrails.

Fixed the 16-color color cycling inside the palette editor.  Fixed color
  cycling when used with a maxit > 32767.  Pixels with iterations > 32767
  now cycle in the same direction as those with iterations <= 32767.

Fixed bug which caused an apparent lockup when find finite attractor was
  used with maxit > 32767.

Fixed viewwindows bug that caused extra points to be written when ydots
  was not divisible by 4.

Fixed Ant type so that it works with 16 digits.  Old pars will need to be
  re-entered or have a decimal point added to the first two parameters.

Changed MAXSTRING in the decoder from 64000 to 60000. This change eliminates
  all the encoder bug examples we have, but we don't understand why it
  works and we may not have fixed the problem.

Fixed the logmap routine when used with a par/gif release <= 1920 and memory
  for the LogTable is insufficient.

Fixed the complexnewton type when used with a par/gif release <= 1920.

Changed the keystroke behavior of the passes= field on the <x> screen.

New logic autocenters all input screen menu titles.

Changed the automatic resolution switching logic between float and arbitrary
  precision.

If user aborts before selecting a file in a file menu screen, the program
  now remembers the last file name selected even if the directory has been
  changed.

Fixed writing 3d smooth factor to PAR.

Fixed writing potential to PAR in makepar mode.

Fixed redundant "Regenerate before <b> to get correct symmetry" messages
  in divide and conquer mode.

Fixed hi rez type 2 diffusion bug and parser error bug.

Fixed crashing in disk video with too long a savename path.

Added Adrian Mariano's diffusion fixes - a new color option, several bug
  fixes, and improved documentation. Removed integer support which wasn't
  being used anyway.

Finally, we've added two undocumented commands to give expert users
   workarounds for math type precision and GIF encoder problems.

Added the mathtolerance=.05/.05 command. The first number controls the
  integer/float transition, and the second number controls the float/arbitrary
  precision transition. The default value of .05 means that the ratio between
  the exact and calculated width and height is between .95 and 1.05. A larger
  value than .05 (say .10) makes the test looser so that the lower precision
  math is used longer. A value <= 0 means the test is always failed and the
  higher precision math type is used. A value >= 1 means that the test is
  always passed and the lower precision math type is used.

  The automatic precision toggle is resolution dependent. The same image may
  use float at 320x200 and arbitrary precision at 640x480. This is not a bug;
  it has to work this way. At a given magnification more pixels require more
  precision. There are other tests so even with mathtolerance=1/.05,
  eventually Fractint will have to use float. The same is not true for
  mathtolerance=.05/1. If you keep zooming Fractint will not rescue you;
  eventually you'll get a nasty error message and the corners will be lost.

Added the tweaklzw=nnn/nnn command. Fractint's GIF encoder occasionally
  fails and produces bad GIF files. Tweaking encoder parameters might
  allow saving in such a situation. The parameters reduce the
  maximum size of the current string and maximum total length of the string
  table, respectively. The default values are 0, which gives the old
  encoder performance.


Version 19.5 is a bug-fix release for version 19.4 based on the developer's
  version 19.40 patch 11. As always, we added a few new features along
  with the bug fixes.

New {=@COMMENTS Comment= command}. You can automatically set any of the four
  PAR comments, and can include variables in the comments such as the
  much-requested $calctime$ and $date$. Fractint now writes ';;' for empty
  comments above the last comment from the comment= command. This prevents
  comments from moving positions when the PAR is reloaded.

New {=@RECORDCOLORS recordcolors= command}. If you place
  recordcolors=y in your SSTOOLS.INI, compressed colors will always be
  written in your PARS. If you want to remember what the map file was
  (assuming the colors were loaded from one), try recordcolors=c. This is
  exactly like recordcolors=y except that the map file (if any) is written
  to a parfile comment.

Added new parser constants:\
  1. whitesq parser constant = (row+col)&1\
  2. scrnpix parser constant = (col,row)\
  3. scrnmax parser constant = (xdots, ydots)\
  4. maxit   parser constant = (maxit,0)\

Added "\\" linewrap for formula files.

Made the round function consistent in all modes. Now round(z) is always
  (floor(x+.5)+i*floor(y+.5)). In version 19.4, in floating point mode
  with type=formula, round() used the coprocessor "nearest or even"
  rounding. Version 19.5 always rounds xxx.5 up.

Fixed a bug that caused a crash when zooming out with certain functions in
  integer mode.

Fixed a bug that caused a crash when attempting 3d=overlay without a filename
  in batch mode.

Fixed a bug that caused part of the video table to not show when compiled
  by Borland.

Fixed a bug that kept the last image browsed from showing up when you
  regenerate an image and then start the browser again.

Fixed a bug that loaded images with the wrong aspect ratio when using the
  browser with the view window turned on, and the file image size was not the
  same as the screen image size.
~ONLINEFF
Version 19.4 is a bug-fix release for version 19.3 based on the developer's
  version 19.30 patch 18. But a few new features did slip in when we weren't
  looking.

New functions are now available for type=formula and general function
  variable use. They are the rounding functions: floor(), ceil(), trunc(),
  and round()

New larger showdot "turtle" to enable better seeing which pixel is currently
  being calculated. The syntax is showdot=<color>/<size>, but the color
  parameter can now be one of auto, bright, medium, and dark in addition to
  the previously-supported color number value.

The <g> command now remembers the last command.

Added the ability to load images into a view window.  This can be used
  with the browser to browse images larger than the current image.

Added George Martin's new integrated entry-finding code. Fractint is now
  more tolerant of text between entries, and the internal code is much
  cleaner than before.

Added Bert Tyler's new VESA truecolor video drivers. These don't do anything
  yet; we've just added the video drivers for testing. Work goes on ...\
  To test out the new modes, try fractint debug=500 type=test and select
  a new truecolor mode. They only work with video boards having VESA
  truecolor support. Some "non-standard VESA" modes (an unfortunate
  oxymoron if there ever was one) can also be supported by editing
  FRACTINT.CFG. These vendor-specific "VESA" modes tend to make Bert,
  our video expert, real grumpy ...

Now for the squashed bugs report:

Ranges is working again.

Fixed a browser bug that caused a crash when the browser cross-hairs
  become too small.

Fixed a bug which put the browser into an infinite loop if the history
  feature was used to try and access a deleted or renamed image that was
  still in the history stack.

Fixed bug that caused any command with greater than 16 parameters to fail,
  most notably textcolors and ranges.

Fixed a center-mag<->corners conversion bug that occurred with rotated images.
  arbitrary precision also (test with debug=3200).

Fixed bug that allowed the matherr debugging file to grow arbitrarily large.
  Matherr file is limited to 100 messages for each fractal.

Fixed bug that affected some Icons3d types, which were broken due to a
  very subtle bug in apparently good code caused by the compiler optimizer.

Version 19.3 is a bug-fix release for version 19.2 based on the developer's
  version 19.21 patch 30.

The biggest changes from 19.2 to 19.3 are the fixing of the color logmap
  function for maximum iterations greater than 32K, and a large increase in
  the maximum size of an individual formula and the maximum number of entries
  in formula, parameter, ifs, and lsystem files.

Changes from 19.2 to 19.3 include:

Added better math function error trapping for the formula parser. This can
  change the rendering of some PAR files using type=formula. If reset=1920
  is included in the PAR file, the new error trapping is disabled.

Fixed an old, rare, but nasty bug that stripped trailing zeros from the
  exponents of floating point numbers written to PAR files.

Ctrl-ins and Ctrl-Del now change the browser frame colors.

Fixed bug that occurred when writing PAR files containing a video= line
  with a four character video mode.

Added batch facility to copy fractal information and color in GIFs to PAR
  format.

Added current column to the <tab> screen.

Removed support for reading Targa files.

Added backwards compatibility for the fractal type fn(z*z).

Added support for expanded and extended memory to the browser.  Use
  expanded memory if you don't have at least 4 MB of extended memory.

Added pi and e to constants that the formula parser recognizes.  Fixed parser
  so that constants are recognized correctly.

Added docs for freestyle mode in the colour editor.

Fixed bug involving comments between formula entries.

Allow renaming Fractint.exe without losing access to fractint's help files.

Center-mag is now the default method for storing coordinates in PAR files.

Increased limit on number of operations in a formula entry from 250 to
  over 2000. In most cases memory use is actually less than before
  because of use of existing memory arrays.

Fixed a bug that caused the image to regenerate when the <y> screen was
  accessed, but nothing was changed (or color cycle range was changed).

Fixed a bug that caused saved partial images that used logmap to use the
  incorrect logmap routine when restored (GIFs & PARs).

Made the solid guessing stop pass parameter save to GIFs and PARS.

Added truecolor=yes command. This causes the iterations for each point to
  be written to a 24-bit Targa truecolor file called iterates.tga. Maxiter
  is also written to the file. This allows a simple outboard program to
  assign truecolors to iterations. Passes=1 is forced, but symmetry works.
  (This function may go away in the future when real truecolor support is
  implemented.)

Fixed bug that caused PARs to have incorrect number of parameters when
  a formula based GIF was loaded and a PAR made immediately.

Added additional bailout tests manh and manr.  See {Bailout Test}.

Fixed <Z> screen so bailout test can be changed when potential is being used.

Fixed bug that caused large filename numbers to increment incorrectly.

Added new guessing options g1, g2, etc. that cause guessing to terminate
  before the last pass.

Added new orbitsave=sound option that causes orbits with sound on to
  write to a file sound.txt. The values written are the Hertz values for
  each orbit point. The time is written out in milliseconds once per pixel.

Added documentation for making demm images to match ones made prior to
  version 16.

Added key pressed check to autologmap so it is possible to bailout with
  a high maxit value.

Made all floating point types capable of zooming out past (32,32).

Added the formula parameters p1, p2, and p3 to the <tab> screen.

Added stereo pair feature to stereo options menu.

Fixed a bug that caused julia_inverse to continue after completed.

Bignumber library rearranged. DOS midnight bug fix, so total time of images
  run overnight is now correct.

Added logmap backwards compatibility for pre-version 19.2 images.

Browser problem with flipped images fixed.

Changed default corners to 4:3 aspect for types sierpinski, popcorn,
  pickover, popcornjul, tim's_error, martin, and halley.

Added a range check for type=ants numants parameter.

RDS save command is no longer case sensitive.

Added the color number to the status area in the palette editor.

Changed logmap and distest to a long variable to accomodate the version 19.0
  change to long maxit.

Added a pixel-at-a-time routine to calculate the logmap values on the fly when
  memory is low or maxit > 32767.  Use logmode=fly to use with maxit < 32767.
  Note: ranges still doesn't work with maxit > 32767.

Extended error checking to set the overflow variable when a zero denominator
  is found.  Added checking of overflow in a few places where it is needed.

Added backwards compatibility for the old "broken" integer parser mod
  function.

Fixed the maximum zoom out of the integer type fn(z*z) (and others) so the
  user doesn't get thrown out to DOS.

Fixed writing of olddemmcolors variable to PAR file.

Version 19.2 changes start on the next page.
~FF
Version 19.2 is a bug-fix release for version 19.1. Changes from 19.1
  to 19.2 include:

Fixed the 3D function, which was broken in 19.1 due to a side-effect of
  a repair of a minor bug in 19.0. Arrgghh! This is the main reason for the
  release of this version so quickly.

Fixed a bug that caused the Julia inverse window and the orbits window to lose
  their place after loading a color map.

Fixed a bug that causes corners to be lost when too many digits are entered.

Added an enhanced ants automaton by Luciano Genero and Fulvio Cappelli.

New showorbit command allows orbits-during-generation feature to be turned
  on by default. Expanded limits of Hertz command to 20 to 15000.

Targa 3D files are now correctly written to workdir rather than tempdir.

Uncommented garbage between file entries is now ignored. (But note that "\{"
  must be on same line as entry name.)

Fixed savename update logic.

Version 19.1 is a bug-fix release for version 19.0. Changes from 19.0
  to 19.1 include:

Disabled the F6 (corners) key when in the parameters screen (<z>) for
  arbitrary precision.

IFS formulas now show in <z> screen.

Allow RDS image maps of arbitrary dimensions.

Touched up Mandelbrot/Julia <Space> toggle logic.

Fractint now remembers map name, and uses the mapfile path correctly, and
  now allows periods in directory names.

Fixed tab bug that caused problems when interrupting a restore of an
  arbitrary precision image.

Repaired savename logic. No longer show (usually truncated) full path of
  the saved file in the screen.

Fixed double to arbitrary precision transition with 90 degree images. (This
  only failed before when the image was rotated exactly 90 degrees.)

Corrected docs directory errors that reported several commands such as
  PARDIR= that were not implemented. Documented the color cycling HOME
  function.

Fixed Mandelbrot/Julia types with bailout less than 4 (try it, results
  are interesting!)

Fixed browser delete feature which left a box on the screen after deleting
  and exiting browser feature.

More changes in filename processing logic.  ".\\" is now recognized as the
  current directory and is expanded to its full path name.  It is now possible,
  although not recommended, to designate the root directory of a disk as the
  desired search directory.

Fixed integer math Mandelbrot bug for 286 or lower machines.

Fixed problem of reading some Lsys files incorrectly (distribution
  PENROSE.L file was broken unless first line was commented.)

Fixed problem that caused endless loop in RDS with bad input values.

Made reading the current directory first optional, added the new
  curdir=yes command for times when you want to use current directory
  files.

Fixed problem with complexpower() function ("x^y" formula operator) in
  the case where x == 0. (Note that formulas where 0^0 appears for every
  every pixel are considered broken and no promises made.)

Prevented aspect ratio drift as you zoom. If you want to make tiny
  adjustments, use new ASPECTDRIFT=0 command.

Inside=bof60 and bof61 options now work correctly with the formula parser.

We discovered the calculation time is no good after 24 days, so instead of the
  time you will now get the message "A Really Long Time!!! (> 24.855 days)".
  We thought you'd like to know ... A prize for the first person who actually
  *sees* this message!

A summary of features new with 19.0 begins on next page.
~FF
New arbitrary precision math allows types mandelbrot, julia, manzpower, and
  julzpower to zoom to 10^1600. See {Arbitrary Precision and Deep Zooming}

New Random Dot Stereogram feature using <Ctrl>-<S>. Thanks to Paul De Leeuw
  for contributing this feature. For more, see {Random Dot Stereograms (RDS)}.

New browser invoked by the <l> command allows you to see the relationships of
  a family of images within the current corners values. See {Browse Commands}
  and {Browser Parameters}. Thanks to Robin Bussell for contributing this
  feature.

Added four bailout tests: real, imag, or, and.  These are
  set on the <Z> screen of the fractal types for which they work.  The
  default is still mod.  See {Bailout Test}.

New asin, asinh, acos, acosh, atan, atanh, sqrt, abs (abs(x)+i*abs(y)),
  and cabs (sqrt(x*x + y*y)) functions added to function variables and parser.

New fractal types types chip, quadruptwo, threeply, phoenixcplx,
  mandphoenixclx, and ant automaton.

Increased maximum iterations to 2,147,483,647 and maximum bailout to 2,100,000,000
  when using floating point math.

New path/directory management. Fractint now remembers the pathname of
  command-line filenames. This means that you can specifiy directories where
  your files reside in SSTOOLS.INI. In what follows, <path> can be a directory,
  a filename, or a full path.

  File                      SSTOOLS.INI Command       Comments\
  ==========================================================================\
  PAR directory             parmfile=<path>\
  GIF files for reading     filename=<path>\
  MAP files                 map=<path>\
  Autokey files             autokeyname=<path>\
  GIF files for saving      savename=<path>\
  Print file                printfile=<path>\
  Formula files             formulafile=<path>\
  Lsystem file              lfile=<path>\
  IFS file                  ifsfile=<path>\
  Miscellaneous files       workdir=<path>\           new command\
  Temporary files           tempdir=<path>\           new command\

  If the directories do not exist, Fractint gives an error message on runup
  with the option to continue.

Fractint now searches all FRM, IFS, LSYS, and PAR files in the designated
  directory for entries. The number of entries in files has been greatly
  increased from 200 to 2000. Comment support in these files is improved.

Parameters shown in <z> screen now match those used in a formula.

Distance estimator logic has been overhauled, with the variable olddemmcolors
  added for backward compatibility.

New floating point code for Lsystems from Nick Wilt greatly speeds up image
   generation.

Enhanced fast parser from Chuck Ebbert makes floating point formula fractals
  faster than built-in types.

Enhanced the history command to include all parameters, colors, and
  even .frm, .l, and .ifs file names and entries. Number of history sets
  remembered can be set with the maxhistory=<nnn> command to save memory.

Enhanced center-mag coordinates to support rotated/stretched/skewed zoom
  boxes.

Added new parameter to built-in Halley for comparison with formula type,
  also added new parameter to Frothybasin type.

Added color number to orbits numbers <n> display.

Added two new parameters to distest= to allow specifying resolution.
  This allows making resolution-independent distance estimator images.

Fixed bug that caused the "big red switch" bug if '(' appeared in random
  uncommented formula file text, but fair warning, we don't officially
  support uncommented text in FRM files.

Symmetry now works for the Marksjulia type and Marksmandel types.

Full path no longer written in PAR files with <b> command.

Fixed fractal type fn(z*z) so that zooming out will no longer dump you out
  to DOS, affecting zoomed out integer images made with this type.

Fixed a float to fudged integer conversion that affects integer fractal
  types fn(z*z) and fn*fn.  This has only a minor impact on integer images
  made with these types.

Default drive and directory restored after dropping to DOS, in
  case you changed it while under DOS.

Added support for inversion to the formula parser (type=formula).

Increased maximum number of files listed by <r> command to 2977 from 300.

Added outside=atan option.

Added faster auto logmap logic.
;
;


;
~Topic=Version 18

Versions 18.1 and 18.2 are bug-fix releases for version 18.0.  Changes from
18.1 to 18.2 include:

 The <b> command now causes filenames only to be written in PAR files.

 Fractint will now search directories in the PATH for files not found in the
 requested the requested directory or the current directory. If you place
 .MAP, .FRM, etc. in directories in your PATH, then Fractint will find them.

 Fixed bug that caused fractals using PI symmetry to fail at high resolution.

 Fractals interrupted with <3> or <r> can now resume.

 The palette editor's <u> (undo) now works.

 The <s> command in orbit/Julia window mode is no longer case sensitive.

 Added warnings that the POV-Ray output is obsolete (but has been left in).
 Use POV-Ray's height field facility instead or create and convert RAW files.

 Fixed several IFS bugs.

Changes from 18.0 to 18.1 include:

 Overlay tuning - the Mandelbrot/Julia Set fractals are now back up
 to 17.x speeds

 Disk Video modes now work correctly with VESA video adapters (they
 used to use the same array for different purposes, confusing each other)

 1024x768x256 and 2048x2048x256 disk video modes work again

 Parameter-file processing no longer crashes Fractint if it attempts to
 run a formula requiring access to a non-existent FRM file

 IFS arrays no longer overrun their array space

 type=cellular fixes

 "autologmap=2" now correctly picks up the minimum color

 The use of disk-video mode with random-access fractal types is now
 legal (it generates a warning message but lets you proceed if you
 really want to)

 The Lsystems "spinning-wheel" now spins slower (removing needless overhead)

 Changes to contributors' addresses in the Help screens

(The remainder of this "new features" section is from version 18.0)

New fractal types:

 19 new fractal types, including:

 New fractal types - 'lambda(fn||fn)', 'julia(fn||fn)', 'manlam(fn||fn)',
 'mandel(fn||fn)', 'halley', 'phoenix', 'mandphoenix', 'cellular',
 generalized bifurcation, and 'bifmay' - from Jonathan Osuch.

 New Mandelcloud, Quaternion, Dynamic System, Cellular Automata fractal
 types from Ken Shirriff.

 New HyperComplex fractal types from Timothy Wegner

 New ICON type from Dan Farmer, including a PAR file of examples.

 New Frothy Basin fractal types (and PAR entries) by Wesley Loewer

 MIIM (Modified Inverse Iteration Method) implementation of Inverse Julia
 from Michael Snyder.

 New Inverse Julia fractal type from Juan Buhler.

 New floating-point versions of Markslambda, Marksmandel, Mandel4,
 and Julia4 types (chosen automatically if the floating-point option
 is enabled).

New options/features:

 New assembler-based parser logic from Chuck Ebbert - significantly
 faster than the C-based code it replaces!

 New assembler-based Lyapunov logic from Nicholas Wilt and Wes Loewer.
 Roughly six times faster than the old version!

 New Orbits-on-a-window / Julia-in-a-window options:\
  1) The old Overlay option is now '#' (Shift-3).\
  2) During generation, 'O' brings up orbits (as before) - after\
     generation, 'O' brings up new orbits Windows mode.\
  3) Control-O brings up new orbits Windows mode at any time.\
  4) Spacebar toggles between Inverse Julia mode and the Julia set and\
     back to the Mandelbrot set.\
 These new "in-a-window" modes are really neat!  See {Orbits Window}
 and {Julia Toggle Spacebar Commands} for details.

 New multi-image GIF support in the <B> command.  You can now generate
 65535x65535x256 fractal images using Fractint (if you have the disk
 space, of course).  This option builds special PAR entries and a
 MAKEMIG.BAT file that you later use to invoke Fractint multiple times
 to generate individual sections of the image and (in a final step)
 stitch them all together.  If your other software can't handle
 Multiple-image GIFs, a SIMPLGIF program is also supplied that converts
 MIGS into simgle-image GIFs.  Press F1 at the <B> prompts screen for
 details.

 Fractint's decoder now handles Multi-Image Gifs.

 New SuperVGA/VESA Autodetect logic from the latest version of
 VGAKIT.  Sure hope we didn't break anything.

 New register-compatible 8514/A code from Jonathan Osuch.  By default,
 Fractint now looks first for the presence of an 8514/A register-compatible
 adapter and then (and only if it doesn't find one) the presence of the
 8514/A API (IE, HDILOAD is no longer necessary for register-compatible
 "8514/a" adapters).  Fractint can be forced to use the 8514/A API by using
 a new command-line option, "afi=yes".  Jonathan also added ATI's
 "8514/a-style" 800x600x256 and 1280x1024x16 modes.

 New XGA-detection logic for ISA-based XGA-2 systems.

 The palette editor now has a "freestyle" editing option.  See
 {Palette Editing Commands} for details.


 Fractint is now more "batch file" friendly.  When running Fractint from
 a batch file, pressing any key will cause Fractint to exit with an
 errorlevel = 2.  Any error that interrupts an image save to disk will
 cause an exit with errorlevel = 2.  Any error that prevents an
 image from being generated will cause an exit with errorlevel = 1.

 New Control-X, Control-Y, and Control-Z options flip a fractal image
 along the X-axis, Y-axis, and Origin, respectively.

 New area calculation mode in TAB screen from Ken Shirriff
 (for accuracy use inside=0).

 The TAB screen now indicates when the Integer Math algorithms are in use.

 The palette must now be explicitly changed, it will not reset to the default
 unexpectedly when doing things like switching video modes.

 The Julibrot type has been generalized.
 Julibrot fractals can now be generated from PAR files.

 Added <b> command support for viewwindows.

 Added room for two additional PAR comments in the <B> command

 New coloring method for IFS shows which parts of fractal came from
 which transform.

 Added attractor basin phase plotting for Julia sets from Ken Shirriff.

 Improved finite attractor code to find more attractors from Ken Shirriff.

 New zero function, to be used in PAR files to replace old integer tan, tanh

 Debugflag=10000 now reports video chipset in use as well as CPU/FPU
 type and available memory

 Added 6 additional parameters for params= for those fractal types that
 need them.

 New 'matherr()' logic lets Fractint get more aggressive when these errors
 happen.

 New autologmap option (log=+-2) from Robin Bussell that ensures that
 all palette values are used by searching the screen border for the lowest
 value and then setting log= to +- that color.

 Two new diffusion options - falling and square cavity.

 Three new Editpal commands: '!', '@' and '#' commands (that's
 <shift-1>, <shift-2>, and <shift-3>) to swap R<->G, G<->B, R<->B.

 Parameter files now use a slightly shorter maximum line length, making
 them a bit more readable when stuffed into messages on CompuServe.

 Plasma now has 16-bit .POT output for use with Ray tracers. The "old"
 algorithm has been modified so that the plasma effect is independent
 of resolution.

 Slight modification to the Raytrace code to make it compatible with
 Rayshade 4.0 patch level 6.

 Improved boundary-tracing logic from Wesley Loewer.

 Command-line parameters can now be entered on-the-fly using the <g> key
 thanks to Ken Shirriff.

 Dithered gif images can now be loaded onto a b/w display.
 Thanks to Ken Shirriff.

 Pictures can now be output as compressed PostScript.
 Thanks to Ken Shirriff.

 Periodicity is a new inside coloring option.
 Thanks to Ken Shirriff.

 Fixes: symmetry values for the SQR functions, bailout for the floating-pt
 versions of 'lambdafn' and 'mandelfn' fractals from Jonathan Osuch.

 "Flip", "conj" operators are now selectable in the parser

 New DXF Raytracing option from Dennis Bragg.

 Improved boundary-tracing logic from Wesley Loewer.

 New MSC7-style overlay structure is used if MAKEFRAC.BAT specifies MSC7.
 (with new FRACTINT.DEF and FRACTINT.LNK files for MSC7 users).  Several
 modules have been re-organized to take advantage of this new overlay
 capability if compiled under MSC7.

 Fractint now looks first any embedded help inside FRACTINT.EXE, and then
 for an external FRACTINT.HLP file before giving up. Previous releases
 required that the help text be embedded inside FRACTINT.EXE.

Bug fixes:

 Corrected formulas displayed for Marksmandel, Cmplxmarksmandel, and
  associated julia types.

 BTM and precision fixes.

 Symmetry logic changed for various "outside=" options

 Symmetry value for EXP function in lambdafn and lambda(fn||fn) fixed.

 Fixed bug where math errors prevented save in batch mode.

 The <3> and <r> commands no longer destroy image -- user can back out
 with ESC and image is still there.

 Fixed display of correct number of Julibrot parameters, and Julibrot
 relaxes and doesn't constantly force ALTERN.MAP.

 Fixed tesseral type for condition when border is all one color but center
 contains image.

 Fixed integer mandel and julia when used with parameters > +1.99 and < -1.99

 Eliminated recalculation when generating a julia type from a mandelbrot
 type when the 'z' screen is viewed for the first time.

 Minor logic change to prevent double-clutching into and out of graphics
 mode when pressing, say, the 'x' key from a menu screen.

 Changed non-US phone number for the Houston Public (Software) Library

 The "Y" screen is now "Extended Options" instead of "Extended Doodads"

 ...and probably a lot more bux-fixes that we've since forgotten that
 we've implemented.

;
~Topic=Version 17

Version 17.2, 3/92

 - Fixed a bug which caused Fractint to hang when a Continuous Potential\
   Bailout value was set (using the 'Y') screen and then the 'Z' screen\
   was activated.\
 - fixed a bug which caused "batch=yes" runs to abort whenever any\
   key was pressed.\
 - bug-fixes in the Stereo3D/Targa logic from Marc Reinig.\
 - Fractint now works correctly again on FPU-less 8088s when\
   zoomed deeply into the Mandelbrot/Julia sets\
 - The current image is no longer marked as "not resumable" on a\
   Shell-To-Dos ("D") command.\
 - fixed a bug which prevented the "help" functions from working\
   properly during fractal-type selection for some fractal types.\

Version 17.1, 3/92

 - fixed a bug which caused PCs with no FPU to lock up when they attempted\
   to use some fractal types.\
 - fixed a color-cycling bug which caused the palette to single-step \
   when you pressed ESCAPE to exit color-cycling.\
 - fixed the action of the '<' and '>' keys during color-cycling.\

Version 17.0, 2/92

- New fractal types (but of course!):

Lyapunov Fractals from Roy Murphy (see {Lyapunov Fractals} for details)

'BifStewart' (Stewart Map bifurcation) fractal type and new bifurcation
parameters (filter cycles, seed population) from Kevin Allen.

Lorenz3d1, Lorenz3d3, and Lorenz3d4 fractal types from Scott Taylor.
Note that a bug in the Lorenz3d1 fractal prevents zooming-out from
working with it at the moment.

Martin, Circle, and Hopalong (culled from Dewdney's Scientific American
Article)

Lots of new entries in fractint.par.

New ".L" files (TILING.L, PENROSE.L)

New 'rand()' function added to the 'type=formula' parser

- New fractal generation options:

New 'Tesseral' calculation algorithm (use the 'X' option list to
select it) from  Chris Lusby Taylor.

New 'Fillcolor=' option shows off Boundary Tracing and Tesseral structure

inside=epscross and inside=startrail options taken from a paper by
Kenneth Hooper, with credit also to Clifford Pickover

New Color Postscript Printer support from Scott Taylor.

Sound= command now works with <O>rbits and <R>ead commands.

New 'orbitdelay' option in X-screen and command-line interface

New "showdot=nn" command-line option that displays the pixel currently
being worked on using the specified color value (useful for those lloooonngg
images being calculated using solid guessing - "where is it now?").

New 'exitnoask=yes' commandline/SSTOOLS.INI option to avoid the final
"are you sure?" screen

New plasma-cloud options.  The interface at the moment (documented here and
  here only because it might change later) lets you:\
  - use an alternate drawing algorithm that gives you an earlier preview\
    of the finished image.
  - re-generate your favorite plasma cloud (say, at a higher resolution)
    by forcing a re-select of the random seed.\

New 'N' (negative palette) option from Scott Taylor - the documentation at
this point is:  Pressing 'N' while in the palette editor will invert
each color. It will convert only the current color if it is in 'x' mode,
a range if in 'y' mode, and every color if not in either the 'x' or 'y' mode.

- Speedups:

New, faster floating-point Mandelbrot/Julia set code from Wesley Loewer,
Frank Fussenegger and Chris Lusby Taylor (in separate contributions).

Faster non-386 integer Mandelbrot code from Chris Lusby Taylor, Mike Gelvin
and Bill Townsend (in separate contributions)

New integer Lsystems logic from Nicholas Wilt

Finite-Attractor fixups and Lambda/mandellambda speedups from Kevin Allen.

GIF Decoder speedups from Mike Gelvin

- Bug-fixes and other enhancements:

Fractint now works with 8088-based AMSTRAD computers.

The video logic is improved so that (we think) fewer video boards will need
"textsafe=save" for correct operation.

Fixed a bug in the VESA interface which effectively messed up adapters
with unusual VESA-style access, such as STB's S3 chipset.

Fixed a color-cycling bug that would at times restore the wrong colors
to your image if you exited out of color-cycling, displayed a 'help'
screen, and then returned to the image.

Fixed the XGA video logic so that its 256-color modes use the same
default 256 colors as the VGA adapter's 320x200x256 mode.

Fixed the 3D bug that caused bright spots on surfaces
to show as black blotches of color 0 when using a light source.

Fixed an image-generation bug that sometimes caused image regeneration
to restart even if not required if the image had been zoomed in
to the point that floating-point had been automatically activated.

Added autodetection and 640x480x256 support for the Compaq Advanced VGA
Systems board - I wonder if it works?

Added VGA register-compatible 320x240x256 video mode.

Fixed the "logmap=yes" option to (again) take effect for continuous potential
images.  This was broken in version 15.x.

The colors for the floating-point algorithm of the Julia fractal
now match the colors for the integer algorithm.

If the GIF Encoder (the "Save" command) runs out of disk space, it now
tells you about it.

If you select both the boundary-tracing algorithm and either "inside=0"
or "outside=0", the algorithm will now give you an error message instead
of silently failing.

Updated 3D logic from Marc Reinig.

Minor changes to permit IFS3D fractal types to be handled properly
using the "B" command.

Minor changes to the "Obtaining the latest Source" section to refer
to BBS access (Peter Longo's) and mailed diskettes (the Public (Software)
Library).

~Topic=Version 16

Version 16.12, 8/91

  Fix to cure some video problems reported with Amstrad
     8088/8086-based PCs.

Version 16.11, 7/91

  SuperVGA Autodetect fixed for older Tseng 3000 adapters.\

  New "adapter=" options to force the selection of specific SuperVGA
     adapter types.  See {Video Parameters} for details.\

  Integer/Floating-Point math toggle is changed only temporarily
     if floating-point math is forced due to deep zooming.\

  Fractint now survives being modified by McAfee's "SCAN /AV" option.\

  Bug Fixes for Acrospin interface, 3D "Light Source Before
     Transformation" fill type, and GIF decoder.\

  New options in the <Z> parameters screen allow you to directly
     enter image coordinates.\

  New "inside=zmag" and "outside=real|imag|mult|summ" options.\

  The GIF Decoder now survives reading GIF files with a local color map.\
  Improved IIT Math Coprocessor support.\

  New color-cycling single-step options, '<' and '>'.\

Version 16.0, 6/91

  Integrated online help / fractint.doc system from Ethan Nagel.
    To create a printable fractint.doc file see {Startup Parameters}.

  Over 350 screens of online help! Try pressing <F1> just about anywhere!\

  New "autokey" feature.  Type "demo" to run the included demo.bat and
    demo.key files for a great demonstration of Fractint.
    See {Autokey Mode} for details.

  New <@> command executes a saved set of commands.  The <b> command has
    changed to write the current image's parameters as a named set of
    commands in a structured file.  Saved sets of commands can subsequently
    be executed with the <@> command.
    See {Parameter Save/Restore Commands}.
    A default "fractint.par" file is included with the release.

  New <z> command allows changing fractal type-specific parameters without
    going back through the <t> (fractal type selection) screen.

  Ray tracer interface from Marc Reinig, generates 3d transform output for a
    number of ray tracers; see {"Interfacing with Ray Tracing Programs"}

  Selection of video modes and structure of "fractint.cfg" have changed. If
    you have a customized fractint.cfg file, you'll have to rebuild it based
    on this release's version. You can customize the assignment of your
    favorite video modes to function keys; see {Video Mode Function Keys}.
    <delete> is a new command key which goes directly to video mode selection.

  New "cyclerange" option (command line and <y> options screen) from Hugh
    Steele. Limits color cycling to a specified range of colors.

  Improved {Distance Estimator Method} algorithm from Phil Wilson.\

  New "ranges=" option from Norman Hills.
    See {Logarithmic Palettes and Color Ranges} for details.

  type=formula definitions can use "variable functions" to select
    sin, cos, sinh, cosh, exp, log, etc at run time;
    new built-ins tan, tanh, cotan, cotanh, and flip
    are available with type=formula; see Type {Formula}

  New <w> command in palette editing mode to convert image to greyscale\

  All "fn" fractal types (e.g. fn*fn) can now use new functions tan, tanh,
    cotan, cotanh, recip, and ident; bug in prior cos function fixed, new
    function cosxx (conjugate of cos) is the old erroneous cos calculation

  New L-Systems from Herb Savage\
  New IFS types from Alex Matulich\
  Many new formulas in fractint.frm, including a large group from
    JM Collard-Richard
  Generalized type manzpwr with complex exponent per Lee Skinner's request\
  Initial orbit parameter added to Gingerbreadman fractal type\

  New color maps (neon, royal, volcano, blues, headache) from Daniel Egnor\

  IFS type has changed to use a single file containing named entries
    (instead of a separate xxx.ifs file per type); the <z> command brings up
    IFS editor (used to be <i> command).  See {=HT_IFS Barnsley IFS Fractals}.

  Much improved support for PaintJet printers; see {PaintJet Parameters}\

  From Scott Taylor:\
    Support for plotters using HP-GL; see {Plotter Parameters}\
    Lots of new PostScript halftones; see {PostScript Parameters}\
    "printer=PS[L]/0/..." for full page PostScript; see {PostScript Parameters}\
    Option to drive printer ports directly (faster); see {Printer Parameters}\
    Option to change printer end of line control chars; see {Printer Parameters}

  Support for XGA video adapter\
  Support for Targa+ video adapter\
  16 color VGA mode enhancements:\
    Now use the first 16 colors of .map files to be more predictable\
    Palette editor now works with these modes\
    Color cycling now works properly with these modes
  Targa video adapter fixes; Fractint now uses (and requires) the "targa"
    and "targaset" environment variables for Targa systems
  "vesadetect=no" parameter to bypass use of VESA video driver; try
    this if you encounter video problems with a VESA driver
  Upgraded video adapter detect and handling from John Bridges; autodetect
    added for NCR, Trident 8900, Tseng 4000, Genoa (this code
    is from a beta release of VGAKIT, we're not sure it all works yet)

  Zoom box is included in saved/printed images (but, is not recognized as
    anything special when such an image is restored)

  The colors numbers reserved by the palette editor are now selectable with
    the new <v> palette editing mode command

  Option to use IIT floating point chip's special matrix arithmetic for
    faster 3D transforms; see "fpu=" in {Startup Parameters}

  Disk video cache increased to 64k; disk video does less seeking when
    running to real disk
  Faster floating point code for 287 and higher fpus, for types mandel,
    julia, barnsleyj1/m1/j2/m2, lambda, manowar, from Chuck Ebbert

  "filename=.xxx" can be used to set default <r> function file mask\

  Selection of type formula or lsys now goes directly to entry selection
    (file selection step is now skipped); to change to a different file, use
    <F6> from the entry selection screen

  Three new values have been added to the textcolors= parameter; if you use
    this parameter you should update it by inserting values for the new 6th,
    7th, 9th, and 13th positions; see "textcolors=" in {Color Parameters}

  The formula type's imag() function has changed to return the result as
    a real number

  Fractal type-specific parameters (entered after selecting a new fractal
    type with <T>) now restart at their default values each time you select
    a new fractal type

  Floating point input fields can now be entered in scientific notation (e.g.
    11.234e-20). Entering the letters "e" and "p" in the first column causes
    the numbers e=2.71828... and pi=3.14159... to be entered.

  New option "orbitsave=yes" to create files for Acrospin for
    some types (see {Barnsley IFS Fractals}, {Orbit Fractals},
    {=@ACROSPIN Acrospin})

  Bug fixes:\
    Problem with Hercules adapter auto-detection repaired.\
    Problems with VESA video adapters repaired (we're not sure we've got them
      all yet...)\
    3D transforms fixed to work at high resolutions (> 1000 dots).\
    3D parameters no longer clobbered when restoring non-3D images.\
    L-Systems fixed to not crash when order too high for available memory.\
    PostScript EPS file fixes.\
    Bad leftmost pixels with floating point at 2048 dot resolution fixed.\
    3D transforms fixed to use current <x> screen float/integer setting.\
    Restore of images using inversion fixed.\
    Error in "cos" function (used with "fn" type fractals) fixed; prior
      incorrect function still available as "cosxx" for compatibility

  Old 3D=nn/nn/nn/... form of 3D transform parameters no longer supported\

  Fractint source code now Microsoft C6.00A compatible.
;
;
~Topic=Version 15

Version 15.11, 3/91, companion to Fractal Creations, not for general
release

  Autokey feature, IIT fpu support, and some bug fixes publicly released in
  version 16.


Version 15 and 15.1, 12/90

  New user interface! Enjoy! Some key assignments have changed and some have
    been removed.
  New palette editing from Ethan Nagel.\
  Reduced memory requirements - Fractint now uses overlays and will run on a
    512K machine.
  New <v>iew command: use to get small window for fast preview, or to setup
    an image which will eventually be rendered on hard copy with different
    aspect ratio
  L-System fractal type from Adrian Mariano\
  Postscript printer support from Scott Taylor\
  Better Tandy video support and faster CGA video from Joseph A Albrecht\
  16 bit continuous potential files have changed considerably;  see the
    Continuous Potential section for details.  Continuous potential is now
    resumable.
  Mandelbrot calculation is faster again (thanks to Mike Gelvin) - double
    speed in 8086 32 bit case
  Compressed log palette and sqrt palette from Chuck Ebbert\
  Calculation automatically resumes whenever current image is resumable and
    is not paused for a visible reason.
  Auto increment of savename changed to be more predictable\
  New video modes:\
    trident 1024x768x256 mode\
    320x480x256 tweak mode (good for reduced 640x480 viewing)\
    changed NEC GB-1, hopefully it works now\
  Integer mandelbrot and julia now work with periodicitycheck\
  Initial zoombox color auto-picked for better contrast (usually)\
  New adapter=cga|ega|mcga|vga for systems having trouble with auto-detect\
  New textsafe=no|yes for systems having trouble with garbled text mode\
  <r> and <3> commands now present list of video modes to pick from; <r> can
    reduce a non-standard or unviewable image size.
  Diffusion fractal type is now resumable after interrupt/save\
  Exitmode=n parameter, sets video mode to n when exiting from fractint\
  When savetime is used with 1 and 2 pass and solid guessing, saves are
    deferred till the beginning of a new row, so that no calculation time is
    lost.
  3d photographer's mode now allows the first image to be saved to disk\
  textcolors=mono|12/34/56/... -- allows setting user interface colors\
  Code (again!) compilable under TC++ (we think!)\
  .TIW files (from v9.3) are no longer supported as input to 3D
    transformations
  bug fixes:\
    multiple restores (msc 6.0, fixed in 14.0r)\
    repeating 3d loads problem; slow 3d loads of images with float=yes\
    map= is now a real substitute for default colors\
    starfield and julibrot no longer cause permanent color map replacement\
    starfield parameters bug fix - if you couldn't get the starfield
    parameters to do anything interesting before, try again with this\
    release\
    Newton and newtbasin orbit display fixed
  Fixed startup and text screen problems on systems with VESA compliant
    video adapters.
  New textsafe=save|bios options.\
  Fixes for EGA with monochrome monitor, and for Hercules Graphics Card.
    Both should now be auto-detected and operate correctly in text modes.
    Options adapter=egamono and adapter=hgc added.
  Fixed color L-Systems to not use color 0 (black).\
  PostScript printing fix.
;
~Topic=Versions 12 through 14

Version 14, 8/90

  LAST MINUTE NEWS FLASH!\
    CompuServe announces the GIF89a on August 1, 1990, and Fractint supports
    it on August 2! GIF files can now contain fractal information!  Fractint
    now saves its files in the new GIF89a format by default, and uses .GIF
    rather than .FRA as a default filetype.  Note that Fractint still
    *looks* for a .FRA file on file restores if it can't find a .GIF file,
    and can be coerced into using the old GIF87a format with the new
    'gif87a=yes' command-line option.

  Pieter Branderhorst mounted a major campaign to get his name in lights:\
  Mouse interface:  Diagonals, faster movement, improved feel. Mouse button
    assignments have changed - see the online help.
  Zoom box enhancements:  The zoom box can be rotated, stretched, skewed,
    and panned partially offscreen.  See "More Zoom Box Commands".
  FINALLY!! You asked for it and we (eventually, by talking Pieter into it
    [actually he grabbed it]) did it!  Images can be saved before
    completion, for a subsequent restore and continue.  See "Interrupting
    and Resuming" and "Batch Mode".
  Off-center symmetry:  Fractint now takes advantage of x or y axis symmetry
    anywhere on the screen to reduce drawing time.
  Panning:  If you move an image up, down, left, or right, and don't change
    anything else, only the new edges are calculated.
  Disk-video caching - it is now possible, reasonable even, to do most
    things with disk video, including solid guessing, 3d, and plasma.
  Logarithmic palette changed to use all colors.  It now matches regular
    palette except near the "lake".  "logmap=old" gets the old way.
  New "savetime=nnn" parameter to save checkpoints during long calculations.\
  Calculation time is shown in <Tab> display.

  Kevin C Allen    Finite Attractor, Bifurcation Engine, Magnetic fractals...\
  Made Bifurcation/Verhulst into a generalized Fractal Engine (like
    StandardFractal, but for Bifurcation types), and implemented periodicity
    checking for Bifurcation types to speed them up.
  Added Integer version of Verhulst Bifurcation (lots faster now). Integer
    is the default.  The Floating-Point toggle works, too.
  Added NEW Fractal types BIFLAMBDA, BIF+SINPI, and BIF=SINPI. These are
    Bifurcation types that make use of the new Engine. Floating-
    point/Integer toggle is available for BIFLAMBDA. The SINPI types are
    Floating-Point only, at this time.
  Corrected the generation of the MandelLambda Set.  Sorry, but it's always
    been wrong (up to v 12, at least).  Ask Mandelbrot !
  Added NEW Fractal types MAGNET1M, MAGNET1J, MAGNET2M, MAGNET2J from "The
    Beauty of Fractals".  Floating-Point only, so far, but what do you
    expect with THESE formulae ?!
  Added new symmetry types XAXIS NOIMAG and XAXIS NOREAL, required by the
    new MAGNETic Fractal types.
  Added Finite Attractor Bailout (FAB) logic to detect when iterations are
    approaching a known finite attractor. This is required by the new
    MAGNETic Fractal types.
  Added Finite Attractor Detection (FAD) logic which can be used by *SOME*
    Julia types prior to generating an image, to test for finite attractors,
    and find their values, for use by FAB logic. Can be used by the new
    MAGNETic Fractal Types, Lambda Sets, and some other Julia types too.

  Mike Burkey sent us new tweaked video modes:\
    VGA     - 400x600x256   376x564x256   400x564x256\
    ATI VGA - 832x612x256
  New HP Paintjet support from Chris Martin\
  New "FUNCTION=" command to allow substition of different transcendental
    functions for variables in types (allows one type with four of these
    variables to represent 7*7*7*7 different types!
  ALL KINDS of new fractal types, some using "FUNCTION=": fn(z*z), fn*fn,
    fn*z+z, fn+fn, sqr(1/fn), sqr(fn), spider, tetrate, and Manowar. Most of
    these are generalizations of formula fractal types contributed by Scott
    Taylor and Lee Skinner.
  Distance Estimator logic can now be applied to many fractal types using
    distest= option. The types "demm" and "demj" have been replaced by
    "type=mandel distest=nnn" and "type=julia distest=nnn"
  Added extended memory support for diskvideo thanks to Paul Varner\
  Added support for "center and magnification" format for corners.\
  Color 0 is no longer generated except when specifically requested with
    inside= or outside=.
  Formula name is now included in <Tab> display and in <S>aved images.\
  Bug fixes - formula type and diskvideo, batch file outside=-1 problem.\
  Now you can produce your favorite fractal terrains in full color instead
    of boring old monochrome! Use the fullcolor option in 3d! Along with a
    few new 3D options.
  New "INITORBIT=" command to allow alternate Mandelbrot set orbit
    initialization.


Version 13.0, 5/90

  F1 was made the help key.\
    Use F1 for help\
    Use F9 for EGA 320x200x16 video mode\
    Use CF4 for EGA 640x200x16 mode (if anybody uses that mode)\
  Super-Solid-guessing (three or more passes) from Pieter Branderhorst
    (replaces the old solid-guessing mode)
  Boundary Tracing option from David Guenther ("fractint passes=btm", or use
    the new 'x' options screen)
  "outside=nnn" option sets all points not "inside" the fractal to color
    "nnn" (and generates a two-color image).
  'x' option from the main menu brings up a full-screen menu of many popular
    options and toggle switches
  "Speed Key" feature for fractal type selection (either use the cursor keys
    for point-and-shoot, or just start typing the name of your favorite
    fractal type)
  "Attractor" fractals (Henon, Rossler, Pickover, Gingerbread)\
  Diffusion fractal type by Adrian Mariano\
  "type=formula" formulas from Scott Taylor and Lee H. Skinner.\
  "sound=" options for attractor fractals.  Sound=x  plays speaker tones
    according to the 'x' attractor value  Sound=y  plays speaker tones
    according to the 'y' attractor value.  Sound=z  plays speaker tones
    according to the 'z' attractor value  (These options are best invoked
    with the floating-point algorithm flag set.)
  "hertz=" option for adjusting the "sound=x/y/z" output.\
  Printer support for color printers (printer=color) from Kurt Sowa\
  Trident 4000 and Oak Technologies SuperVGA support from John Bridges\
  Improved 8514/A support (the zoom-box keeps up with the cursor keys now!)\
  Tandy 1000 640x200x16 mode from Brian Corbino (which does not, as yet,
    work with the F1(help) and TAB functions)
  The Julibrot fractal type and the Starmap option now automatically verify
    that they have been selected with a 256-color palette, and search for,
    and use, the appropriate GLASSESn.MAP or ALTERN.MAP palette map when
    invoked.  *You* were supposed to be doing that manually all along, but
    *you* probably never read the docs, huh?
  Bug Fixes:\
    TAB key now works after R(estore) commands\
    PS/2 Model 30 (MCGA) adapters should be able to select 320x200x256 mode
      again (we think)\
    Everex video adapters should work with the Autodetect modes again (we
      think)


Version 12.0, 3/90

  New SuperVGA Autodetecting and VESA Video modes (you tell us the
    resolution you want, and we'll figure out how to do it)
  New Full-Screen Entry for most prompting\
  New Fractal formula interpreter ('type=formula') - roll your own fractals
    without using a "C" compiler!
  New 'Julibrot' fractal type\
  Added floating point option to all remaining fractal types.\
  Real (funny glasses) 3D - Now with "real-time" lorenz3D!!\
  Non-Destructive <TAB> - Check out what your fractal parameters are without
    stopping the generation of a fractal image
  New Cross-Hair mode for changing individual palette colors (VGA only)\
  Zooming beyond the limits of Integer algorithms (with automatic switchover
    to a floating-point algorithm when you zoom in "too far")
  New 'inside=bof60', 'inside=bof61' ("Beauty of Fractals, Page nn") options\
  New starmap ('a' - for astrology? astronomy?) transformation option\
  Restrictions on the options available when using Expanded Memory
    "Disk/RAM" video mode have been removed
  And a lot of other nice little clean-up features that we've already
    forgotten that we've added...
  Added capability to create 3D projection images (just barely) for people
    with 2 or 4 color video boards.
;
~Topic=Versions  1 through 11

Version 11.0, 1/90

  More fractal types\
    mandelsinh/lambdasinh        mandelcosh/lambdacosh\
    mansinzsqrd/julsinzsqrd      mansinexp/julsinexp\
    manzzprw/julzzpwr            manzpower/julzpower\
    lorenz (from Rob Beyer)      lorenz3d\
    complexnewton                complexbasin\
    dynamic                      popcorn\
  Most fractal types given an integer and a floating point algorithm.
    "Float=yes" option now determines whether integer or floating-point
    algorithms are used for most fractal types.  "F" command toggles the use
    of floating-point algorithms, flagged in the <Tab> status display
  8/16/32/../256-Way decomposition option (from Richard Finegold)\
  "Biomorph=", "bailout=", "symmetry="  and "askvideo=" options\
  "T(ransform)" option in the IFS editor lets you select 3D options (used
    with the Lorenz3D fractal type)
  The "T(ype)" command uses a new "Point-and-Shoot" method of selecting
    fractal types rather than prompting you for a type name
  Bug fixes to continuous-potential algorithm on integer fractals, GIF
    encoder, and IFS editor


Version 10.0, 11/89

  Barnsley IFS type (Rob Beyer)\
  Barnsley IFS3D type\
  MandelSine/Cos/Exp type\
  MandelLambda/MarksLambda/Unity type\
  BarnsleyM1/J1/M2/J2/M3/J3 type\
  Mandel4/Julia4 type\
  Sierpinski gasket type\
  Demm/Demj and bifurcation types (Phil Wilson), "test" is "mandel" again\
  <I>nversion command for most fractal types\
  <Q>uaternary decomposition toggle and "DECOMP=" argument\
  <E>ditor for Barnsley IFS parameters\
  Command-line options for 3D parameters\
  Spherical 3D calculations 5x faster\
  3D now clips properly to screen edges and works at extreme perspective\
  "RSEED=" argument for reproducible plasma clouds\
  Faster plasma clouds (by 40% on a 386)\
  Sensitivity to "continuous potential" algorithm for all types except
    plasma and IFS
  Palette-map <S>ave and Restore (<M>) commands\
  <L>ogarithmic and <N>ormal palette-mapping commands and arguments\
  Maxiter increased to 32,000 to support log palette maps\
  .MAP and .IFS files can now reside anywhere along the DOS path\
  Direct-video support for Hercules adapters (Dean Souleles)\
  Tandy 1000 160x200x16 mode (Tom Price)\
  320x400x256 register-compatible-VGA "tweaked" mode\
  ATI VGA Wonder 1024x768x16 direct-video mode (Mark Peterson)\
  1024x768x16 direct-video mode for all supported chipsets\
  Tseng 640x400x256 mode\
  "Roll-your-own" video mode 19\
  New video-table "hot-keys" eliminate need for enhanced keyboard to access
    later entries


Version 9.3, 8/89

  <P>rint command and "PRINTER=" argument (Matt Saucier)\
  8514/A video modes (Kyle Powell)\
  SSTOOLS.INI sensitivity and '@THISFILE' argument\
  Continuous-potential algorithm for Mandelbrot/Julia sets\
  Light source 3D option for all fractal types\
  "Distance estimator" M/J method (Phil Wilson) implemented as "test" type\
  LambdaCosine and LambdaExponent types\
  Color cycling mode for 640x350x16 EGA adapters\
  Plasma clouds for 16-color and 4-color video modes\
  Improved TARGA support (Joe McLain)\
  CGA modes now use direct-video read/writes\
  Tandy 1000 320x200x16 and 640x200x4 modes (Tom Price)\
  TRIDENT chip-set super-VGA video modes (Lew Ramsey)\
  Direct-access video modes for TRIDENT, Chips & Technologies, and ATI VGA
    WONDER adapters (John Bridges). and, unlike version 9.1, they WORK in
    version 9.3!)
  "zoom-out" (<Ctrl><Enter>) command\
  <D>os command for shelling out\
  2/4/16-color Disk/RAM video mode capability and 2-color video modes
    supporting full-page printer graphics
  "INSIDE=-1" option (treated dynamically as "INSIDE=maxiter")\
  Improved <H>elp and sound routines (even a "SOUND=off" argument)\
  Turbo-C and TASM compatibility (really!  Would we lie to you?)


Version 8.1, 6/89

  <3>D restore-from-disk and 3D <O>verlay commands, "3D=" argument\
  Fast Newton algorithm including inversion option (Lee Crocker)\
  16-bit Mandelbrot/Julia logic for 386-class speed with non-386 PCs on
    "large" images (Mark Peterson)
  Restore now loads .GIF files (as plasma clouds)\
  TARGA video modes and color-map file options (Joe McLain)\
  30 new color-cycling palette options (<Shft><F1> to <Alt><F10>)\
  "Disk-video, RAM-video, EMS-video" modes\
  Lambda sets now use integer math (with 80386 speedups)\
  "WARN=yes" argument to prevent over-writing old .GIF files


Version 7.0, 4/89

  Restore from disk (from prior save-to-disk using v. 7.0 or later)\
  New types: Newton, Lambda, Mandelfp, Juliafp, Plasma, Lambdasine\
  Many new color-cycling options (for VGA adapters only)\
  New periodicity logic (Mark Peterson)\
  Initial displays recognize (and use) symmetry\
  Solid-guessing option (now the default)\
  Context-sensitive <H>elp\
  Customizable video mode configuration file (FRACTINT.CFG)\
  "Batch mode" option\
  Improved super-VGA support (with direct video read/writes)\
  Non-standard 360 x 480 x 256 color mode on a STANDARD IBM VGA!


Version 6.0, 2/89

  32-bit integer math emulated for non-386 processors; FRACT386 renamed
    FRACTINT
  More video modes


Version 5.1, 1/89

  Save to disk\
  New! Improved! (and Incompatible!) optional arguments format\
  "Correct" initial image aspect ratio\
  More video modes


Version 4.0, 12/88

  Mouse support (Mike Kaufman)\
  Dynamic iteration limits\
  Color cycling\
  Dual-pass mode\
  More video modes, including "tweaked" modes for IBM VGA and register-
    compatible adapters


Version 3.1, 11/88

  Julia sets


Version 2.1, 10/23/88 (the "debut" on CIS)

  Video table\
  CPU type detector


Version 2.0, 10/10/88

  Zoom and pan


Version 1.0, 9/88

  The original, blindingly fast, 386-specific 32-bit integer algorithm
;
;
;
~Data=INTRO_AUTHORS
;
; FRACTINT intro screen primary authors
;
 Primary Authors (current version)
 Timothy Wegner       twegner AT fractint.org
 Jonathan Osuch       josuch AT fractint.org
 Contributing Authors
 ; room for 15 authors at a time here















 SPACEBAR toggles scrolling off/on
   Copyright (C) 1990-2006 The Stone Soup Group.  Fractint may be freely copied
   and distributed but may not be sold.  See help for more information.
;
;
;
~Data=INTRO_CREDITS
;
; FRACTINT intro screen contributing authors.
;
                  ...
 Michael Abrash       360x480x256, 320x400x256 VGA video modes
 Rees Acheson         (Author of MandelB) pentium speedups
 Joseph Albrecht      Tandy video, CGA video speedup
 Kevin Allen          Finite attractor, bifurcation engine
 Humberto Baptista    passes=d, latoocarfian type
 Steve Bennett        restore-from-disk logic
 Rob Beyer            Barnsley IFS, Lorenz fractals
 Francois Blais       Lyapunov Fractals, LYAPUNOV.MAP
 Scott D. Boyd        Xfractint user interface cleanup
 Dennis Bragg         DXF Raytracing output option
 Juan J. Buhler       Diffusion options, inverse Julia type
 Mike Burkey          376x564x256, 400x564x256, and 832x612x256 VGA video modes
 Robin Bussell        Fractal browser and evolver, past primary author
 John Bridges         superVGA support, 360x480x256 mode
 Fulvio Cappelli      ants options and speedup
 Charlie Chernohorsky Virtual VESA screen sizes & speedup
 Brian Corbino        Tandy 1000 640x200x16 video mode
 Lee Crocker          Fast Newton, Inversion, Decomposition..
 Monte Davis          Documentation
 Paul De Leeuw        RDS (Random Dot Stereogram) Feature
 Jean-Pierre Demailly Xfractint truecolor
 Chuck Ebbert         cmprsd & sqrt logmap, fpu speedups, fast parser
 Dan Farmer           orbits enhancements
 Richard Finegold     8/16/../256-Way Decomposition option
 Frank Fussenegger    Mandelbrot speedups
 Sylvie Gallet        Formula and math wizard
 Mike Gelvin          Mandelbrot speedups
 Luciano Genero       ants options and speedup
 Lawrence Gozum       Tseng 640x400x256 Video Mode
 David Guenther       Boundary Tracing algorithm
 Jay Hill             Windows notes
 Mike Kaufman         mouse support, other features
 Norman Hills         Ranges option
 Richard Hughes       "inside=", "outside=" coloring options
 Bill Jemison         orbitsave=sound option
 Damien M. Jones      Windows notes, web hosting
 Wesley Loewer        Arbitrary precision, past primary author
 Adrian Mariano       Diffusion & L-Systems
 Charles Marslett     VESA video and IIT math chip support
 George Martin        Formula parser, past primary author
 Andrew McCarthy      European keyboard support
 Joe McLain           TARGA Support, color-map files
 Bob Montgomery       (Author of VPIC) Fast text I/O routines
 Bret Mulvey          plasma clouds
 Roy Murphy           Lyapunov Fractals
 Ethan Nagel          Palette editor, integrated help/doc system
 Yavuz Onder          Postscript printer driver
 Kyle Powell          8514/A Support
 Mark Peterson        Parser, julibrot, past primary author
 Marc Reinig          Lots of 3D options
 Pieter Branderhorst  Solid guessing, menus, past primary author
 Michael Sargent      Volterra-Lotka, escher_julia fractals
 Matt Saucier         Printer Support
 Herb Savage          'inside=bof60', 'inside=bof61' options
 Ken Shirriff         Quaternions, CA, Xfractint port
 Lee Skinner          Tetrate fractal types and more
 Michael Snyder       julia inverse and Julia-In-A-Window using MIIM
 Dean Souleles        Hercules Support
 Kurt Sowa            Color Printer Support
 Hugh Steele          cyclerange feature
 Iain Stirling        Inside=fmod and outside=fmod
 John Swenson         Postscript printer features
 Chris Taylor         Floating&Fixed-point algorithm speedups, Tesseral Option
 Scott Taylor         PostScript, Kam Torus, many fn types.
 Rich Thomson         Xfractint truecolor support, mailing list
 Bill Townsend        Mandelbrot Speedups
 Bert Tyler           Original Fractint/Fract386 Author 
 Paul Varner          Extended Memory support for Disk Video
 Dave Warker          Integer Mandelbrot Fractals concept
 Aaron Williams       Register-compatible 8514/A code
 Phil Wilson          Distance Estimator, Bifurcation fractals
 Nicholas Wilt        Lsystem speedups
 Richard Wilton       Tweaked VGA Video modes
;
;
