The 8x series of Texas Instruments graphing calculators, including the TI-82, the TI-83 and 83+, and the TI-86 (to mention some of the more common ones.) The main difference between these and lesser TI calculators is mainly the ability to write programs in BASIC, ranging from nifty Geomitry tools (like my own GNU/Math) to games (Tetris!)

Don't forget the TI-89, it has the same processor and software as the TI-92, but in a case the size of a TI-86.

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