Back to index

Info for ti81


====== Texas Instruments TI-81 (1990) ======




===== Features =====

* CPU: Z80 2 MHz
* Memory: RAM 32kB(?), ROM 128kB
* Screen: 96 x 64 pixels, 16 x 8 characters
* Known ROM versions: 1.1, 1.8, 2.0



===== Usage =====

* After start TI-81 waits for ON key interrupt, so press ON key to start calculator.

* Video engine (with grayscale support) based on the idea found in VTI source emulator written by Rusty Wagner.



===== Known Issues =====

* Grayscale effects emulated

* 200Hz(?) timer and ON key interrupts emulated

* There are bugs in port 3 emulation (ON/OFF)

* To do: port 3 and 4, NVRAM, Better artworks, Drivers for other ROM versions

* Needed
* Any hardware info.
* High quality artwork.
* Dumps of other ROM versions (1.1 and 2.0).



===== History and Trivia =====

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 It has since been replaced by newer models which have faster processors, more memory, and popular features such as linking capability and flash upgradability.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.

//(info from ticalc.org)//



===== Links =====

* Texas Instruments Homepage -- http://www.ti.com
* ticalc.org -- http://www.ticalc.org
* TI-Files -- http://www.ti-files.org



===== Other Emulators =====

* Texas Instruments TI-81 simulator -- http://www.ti.com
* Virtual TI -- http://sourceforge.net/projects/virtualti/




Generated on Sun Jul 19 10:17:28 2009