As a programmer, I allways think about "how things are done" when it comes to programs and technical equipment. So when I first got hold of my calculator I started making small basic programs for it, but were irritated over the poor speed. And then some of my pals had Tetris and Nibbles, working at a "incredible" speed, and soon I had discovered the z80 part of my calculator.

I downloaded any information I could find about z80 and the ti-83 interface. I was used to allways finding information about all available function and now I was irritated over not finding f.i. which registers that are destroyed by a function call. So I started tracing the functions I used, noting registers used, and writing comments to the rom-assembly code.

The source for following documents is the ti-83 rom pages. I make no warranty for whatever damage use or missuse or writer errors this may result in.

Ti83 Memorymapper

Information about the Ti83 memorymapper and a short notice on how to render the build-in variable font.