The TI-81, TI's first graphing calculator, was designed for algebra and precalculus. It has since been replaced by newer models which have faster processors, more memory, and popular features such as linking capability and flash upgradability. The TI-81 drew little in the way of third-party games and other programs, since the code must be typed into the calculator by hand.
From time to time, TI will update the internal code of their calculators to work around bugs, optimize functions, and even add features. This results in several versions of each calculator in the marketplace. You can check the ROM version of your TI-81 using the following key sequence and reading the number on your screen:
[TEST] [ALPHA] [S]
After entering the above key sequence, DO NOT PRESS ENTER! If you do, your calculator's memory will be erased during the self-test sequence. Press any other key to exit back harmlessly.
Known ROM versions: 1.1, 1.6K, 2.0
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This page was last modified on October 4th, 2008