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Expansion and upgrades are becoming more and more popular as knowledge about the internal workings of these machines continues to grow. I even accelerated my own TI-85 (original instructions by Boris Lutz and Keith L. Miller). I have looked at all the instructions that I could find and made this page so it would be a little easier to view (many of them used all text. I have added graphics that illustrate the actual board's surface). Curently, the TI-81, TI-85, and TI-86 can be accelerated to approximately 3x their normal speed, about 18 MHz. The TI-82 and TI-83 can also be accelerated, but it is a little bit more complicated. They only about double their speed to around 12 MHz. The TI-92 can be accelerated to possibly over or at least near 20 MHz!

Accelerate the TI-81
Accelerate the TI-82
Accelerate the TI-83
Accelerate the TI-85
Accelerate the TI-86
Accelerate the TI-92