The TRASH-80 had a full port of Unix -- Microsoft Xenix, for the 68k-based Model 16, 1982. The only other Unix workstation on the market at that time besides the Sun.
The model 16 series were not really workstations for a single user. They were explicitly intended for multi-user, multi-terminal applications. They had practically no graphics capability.
Apollo was arguably the first "Workstation" vendor, selling affordable 68000-based systems, before the 68010. (If I recall correctly, before the 68010, in order to handle a page fault, you had to set up a system with two 68000s. Only one would execute at a time. In the event of a page fault, one CPU would halt, and the other would begin executing.)
By 1982, with the advent of the much-friendlier 68010, there were a number of UNIX workstation vendors. The notable survivors of that era were Apollo, HP, SGI, and Sun, but there were others. Even AT&T had a line of UNIX workstations in the early 80s.
