The TI-83 was a graphical calculator from Texas
Instruments. It had a black and white display, some buttons and a Z80
processor, and it allowed you to write programs in assembly
This I did, and I also managed to extract the ROM code from within the
calculator (not a trivial task, since the memory was paged), and investigate
it. I discovered some things which were of great help to me and to others in
the TI-83 community. Today, this sort of activity could very well be illegal in
the USA, and perhaps soon in Europe.
The TI-83 community thrived in the 1990:s, but unfortunately, Texas
Instruments have upgraded their ROM software in a way which is not
backwards-compatible, so if you buy a TI-83 now, you won't be able to run all
the old programs.
- WizMusic - My first music program for the TI-83.
Plays the Bossa Nova-theme from C64 Wizball, originally composed by Martin
Galway. You need a 2.5 -> 3.5 mm adapter to be able to connect a pair of normal
stereo earphones to the link port of the calculator.
- Complications - Another piece of music for
the '83. This one was originally composed by Tomas Danko.
- The very first full-blown demo for the TI-83 - RiDE
is here to kick some ass.
- The graphical adventure game Stranded, my first
game for the TI-83. You can also play
this game online.
I spent a lot of time disassembling and investigating the TI-83 ROM, to see
if I could find anything useful. The following discoveries have been used
extensively by the TI-83 community:
The source code for Stranded is now freely available, together with a brief
guide to the layout of the game and its data structures. Download the complete source code. (240k) Inside
the archive you will find a file called the_guide.text, which tries to explain how the game
works. Note that you can play Stranded
A lot of people have asked me to release the source code to RiDE (and I'm
flattered, of course). Well, here it is! Warning: This
is a demo. The code does not try to be clean or understandable. You won't be
able to compile it without the data files either. However, tunnel.c was used to precalculate the tunnel data.