+--------------------------------+
| Starfield Simulation           |
|  Version: 1.3                  |
|   Author: ...                  |
|   E-mail: Borealis02@yahoo.com |
| Platform: TI-83/83+ Ion        |
|     Date: 6-22-2000            |
+--------------------------------+

I. About the program

   As the name implies, this program generates a true three-dimensional
starfield, and the user flies through it (much like the classic Windows
screen saver).


II. Installation

   Installation is the same as any other program (Skip to the next section
if you've done this before).  Just send the file Stars.83p to your TI-83,
or Stars.8xp to the TI-83+.  This program requires Ion to run, so make sure
you send that to your calculator and install it before trying to run
Starfield Simulation.  See also the Ion installation and usage instructions
for details.


III. Usage

   When you run Starfield Simulation from Ion, the animation starts
immediately.  During the animation, pressing MODE will bring up the Setup
screen.  If you leave the program animation running for about 30 seconds,
the calculator will automatically turn off.  You can turn it back on by
pressing On (what a concept!).  Pressing DEL during the animation will quit.


IV. Version History

---------
 Version 1.0 (2-25-2000)
  - Size: 1,637 bytes (TI-83+)
  - Code is up and running, doesn't crash
  - Speed control by function keys

---------
 Version 1.1 (3-2-2000)
  - Size: 1,964 bytes (TI-83+)
  - Fixed a few minor bugs
  - Stars appear farther away, and more randomly so
  - Stars in the distance appear as one point instead of a square
  - Added 16 more stars to the 32 already there

---------
 Version 1.2 (3-11-2000)
  - Size: 1,601 bytes (TI-83+)
  - Added power-down feature
  - Added setup screen (MODE), with saving of settings
  - Moved storage of star coordinates to saferam1, instead of in the program
   itself
  - Changed quit key from CLEAR to DEL

---------
 Version 1.3 (6-22-2000)
  - Size: 1,231 bytes (TI-83+),
          1,229 bytes (TI-83)
  - Rewrote division routine
  - Fixed bug that caused stars to disappear for no reason
  - Recalculated frame number requirement for powerdown due to increased
   speed (24% faster)
  - Released 83 version


VI. Thanks

   I haven't worked with anyone else on this program, but I have acquired a
lot of information from outside sources.

 - AsmGuru, The TI-83 assembly language Windows help file
 - Everyone else who releases their source code


V. Final comments

   I've tested this program extensively, on one occasion leaving it running
overnight (Accidentally, of couse... this is mainly what inspired me to add
the power-down feature), and it didn't crash.  But it probably isn't perfect,
so (As with any other assembly language program) the execution of this program
carries an inherent risk of data loss.  I appreciate questions and comments;
feel free to send me a message at Borealis02@yahoo.com.

   83 users, please note that I haven't tested this extensively on the 83, but
Devpac83's output usually works on both calculators if it works on either one.
Contact me if you encounter problems.

   Also, I would appreciate it if anyone who uses parts of my source or takes
an idea from it would give me some credit.  No one likes people who
disassemble code and steal it, so don't do that.