#### Back to index | # Info for ti81

Texas Instruments TI-81 (1990)
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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 It has since been replaced by newer models which have faster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.
(note taken from www.ticalc.org)
Features
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CPU: Z80 2 MHz
Memory: RAM 32kB(?), ROM 128kB
Screen: 96x64 pixels, 16x8 characters
Known ROM versions: 1.1, 1.8, 2.0
Emulator
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Texas Instruments TI-81 simulator (http://www.ti.com)
Links
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Texas Instruments Homepage
http://www.ti.com
ticalc.org
http://www.ticalc.org
TI-Files
http://www.ti-files.org
Mess Emulation State
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driver for rom versions: 1.8
grayscale effects emulated
200Hz(?) timer and ON key interrupts emulated
there are bugs in port 3 emulation (ON/OFF)

Notes:
1. After start TI-81 waits for ON key interrupt, so press ON key to start
calculator.
2. Video engine (with grayscale support) based on the idea found in VTI source
emulator written by Rusty Wagner.

To do:
- port 3 and 4
- nvram
- better artworks
- drivers for other rom versions

Needed:
1. Any hardware info.
2. High quality artwork.
3. Dumps of other rom versions.

created on Thu Aug 16 22:55:01 2001