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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.).


Hate to perform thread necromancy, but the 99/4A was in no way superior to the C64. I had a 99/4A and loved it, but the C64 was so much more advanced than the 99/4A. Sorry.

Friday 18th August 2023
Ernie (US)

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)


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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