The TI-83 Plus/84 Plus LCD is 96 pixels wide by 64 pixels high. Using assembly (even libs for BASIC), the entire LCD content can be used. Using pure BASIC commands, unless the TI-OS contains glitches proving this wrong, you can only use 95x63 (the right-most column and bottom-most row cannot be used)
http://www.ticalc.org/basics/calculators/ti-84plus.htmlhttp://en.wikipedia.org/wiki/Ti-83#TI-83_PlusIf anyone is aware of what area of the screen can be used on a TI-85, 86, 89, 92/+/v200 and TI-Nspire, BASIC and ASM, and have proof, let me know.
TI-81: 96x64 BASIC, 96x64 ASM
TI-82 through 84+SE: 95x63 BASIC, 96x64 ASM