TRS-80 Model I, circa 1978, which was replaced with a TRS-80 Model II the following year. Yep, the good ol' TRS-80, with its blow-on-it-and-you've-ruined-it 8 inch floppy disk.
The only real game for it was Zork, of course.
It's dark here. You'll likely be eaten by a grue.