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T > TEXAS INSTRUMENTS  > Computer 99/8   

Texas Instruments
Computer 99/8

The 99/8 was intended as an upmarket companion to the TI 99/4A . Something like a small business computer. However, at TI they didn't think it would generate any income, so it was never released.

It has built-in features which were optional in the 4A : The speech synthesiser and the Pascal UCSD ROM card. It is a prototype computer and was never marketed.


Very interesting information from CC Clarke
As a young electronic technician at TI, I labored in the "trenches" during the Home Computer Wars of the early eighties. It was brutal. Our 99/4A was technologically superior to the Comodore 64, but was marketed against the VIC 20 in price.
The 99/8 (codenamed: Roadrunner) was supposed to remedy that situation. It was more advanced, cheaper to produce, (the bottom line was ALWAYs the decisive factor in corporate decision-making) and used the existing TI HexBus interface, touted as the emerging interface standard at TI.
Unfortunately, TI got a very bloody nose when it voluntarily recalled thousands of 99/4A AC transformers due to a perceived fusing issue.

Thousands of 99/8s were built and warehoused (before being destroyed) after it was discovered they couldn't meet FCC EMI specs without expensive design changes.
In 1982/83, TI was losing more money in their Lubbock Consumer Products Division than they could justify. and the 99/8's problems made it cheaper to bury than bring to market. A few escaped and are considered collector's items.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


The Myarc Geneve was not a "clone" of the 99/8. It used the same CPU, but absent were the Hex Bux interface, built-in speech, and the built-in USCD Pascal system. It also used a totally different operating system. People have compared it to the 99/8 but it''s in no way a "clone" of the 99/8.

Wednesday 17th June 2015
Andy (USA)

Monday 30th July 2012
frank (us)

Dan you are right. I knew a few members of the North Jersey TI Users club that had them. Myarc was based in Basking Ridge, NJ and it was called the Geneve. Some used the PE box or a PC case to hose the parts. I know that at least one was still in use in the late 1990s.

Tuesday 8th November 2011
Stephen Boutillette


NAME  Computer 99/8
MANUFACTURER  Texas Instruments
TYPE  Home Computer
YEAR  1983
KEYBOARD  QWERTY full-stroke keyboard, 54 keys
CPU  TI TMS 9995
CO-PROCESSOR  TMS 9918A (Video Generator)
RAM  64 kb (up to 15Mb !)
61 kb free with Basic
VRAM  16 kb
ROM  220 Kb
TEXT MODES  32 x 24 (16 colors) / 40 x 24 (2 colors)
GRAPHIC MODES  64 x 48 (with 4x4 graphic symbols), 256 x 128 (16 colors), 256 x 192 (16 colors)
SOUND  3 channels & 5 octaves, speech synthesizer built-in
I/O PORTS  Tape, RGB video out (DIN), Joystick, HexBus connector, Expansion port (16 bits), Cartridge slot (GROM port)
OS  P-System
PRICE  planned for 600$

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