TI Basic

TI Basic is a programming language supported on nearly every Texas Instruments graphing calculator in some form.

It's been revised many times with each model, where capability and feature set varies greatly. The variants are mostly categorized into "Z80 TI-Basic" (including the eZ80 found in the TI-84 Plus CE), "68k TI-Basic", and "Nspire TI-Basic". Even within these categories, they are not all the same, and a program for the TI-84 Plus will likely not function on a TI-81, for example, due to missing features and different syntax.