Texas Instruments TI-99/4A
http://en.wikipedia.org/wiki/Texas_Instruments_TI-99/4A I think it was quite rare here though, all my home computer owning friends had either some Commodore machine (first VIC-20, then C=64) or Sinclair Spectrum or similar, or Atari VCS. I originally jumped to TI because I noticed how superior the TI version of "Space Invaders" was to the VIC-20, let alone to the horrid Atari VCS, version.
I loved the part how TI lost to Commodore (VIC-20 & C=64) because e.g.:
Commodore also made other cost-cutting changes including using aluminized cardboard to build RF shields for some of their systems. Texas Instruments never followed suit, electing instead to continue to use the highest quality components and materials with the unfulfilled hope that the marketplace would recognize it.
So TI lost partly because it was manufacturing a too high-quality home computer?
For a short period of time, I think TI had the most amazing gaming graphics of any home gaming system. Parsec....