Actually, are we only counting machines that ran
Unix-a-like systems, or
anything in the workstation class? (i.e. does PERQ qualify? :-)
And just how would you describe PNX?
(for the uninitiated, PNX, pronounced peenix, is essentially PERQ Unix.
I am not sure how much AT&T code is in it, but probably quite a bit,
actually.
It was available for the PERQ 1 and 2 machines (AFAIK there never was a
version for the PERQ 2T4, and the 68020-based PERQ 3a ran nothing else).
-tony