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INTRODUCTION
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 It has since been replaced by newer models which have faster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.
PHOTO
MODEL SPECIFICATIONS
OFFICIAL INFORMATION
» Official TI-81 home page at Texas Instruments
» Guide Books from Texas Instruments
» Graphing Calculator Comparison
» TI Online Store
UNDOCUMENTED FEATURES
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]
WARNING: 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, 2.0
UNOFFICIAL UPGRADES
» Power Extension Page
The Power Extension instructions will show you how to use AA (instead of AAA)
batteries without making any modifications to your calculator.
» TI-81 Turbo Page
Internal modifications to your TI-81 can overclock the calculator to 3-4 times
its original speed.
EMULATORS
Several emulators are available to let you simulate TI calculators on your
computer.
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