Tandy TRS-80 Model II
The Tandy TRS-80 Model II was an expensive Tandy computer with a 68000 CPU, and up to 1MB of ram... I recall these selling for $10,000 in a configuration that could run Xenix. And they could support 3 (or more?) users. These machines, much like the Sun-1 had a custom MMU to run Unix, and as far as I know there is no emulator for it, unlike the Apple Lisa.
Some information can be found:
Xenix can be downloaded from here: