Pick ran on a plethora of different platforms. Ultimate even had a port for IBM mainframes, PICK/370.
How much use all these different ports saw, I don’t know. Obviously some of them were pretty big (you mention Prime, I’ll mention R83) - others less so. I wonder how many customers IBM RT PC PICK ever actually had. Probably significantly less than PICK ever had on AIX for RS/6000 (at one point several different PICK vendors offered Unix ports, and AIX was commonly on the list of supported Unix flavours)
> I wonder how many customers IBM RT PC PICK ever actually had.
According to Wikipedia:
Approximately 23,000 RTs were sold over its lifetime, with some 4,000 going into IBM's development and sales organizations. Pick OS sales accounted for about 4,000 units.
How much use all these different ports saw, I don’t know. Obviously some of them were pretty big (you mention Prime, I’ll mention R83) - others less so. I wonder how many customers IBM RT PC PICK ever actually had. Probably significantly less than PICK ever had on AIX for RS/6000 (at one point several different PICK vendors offered Unix ports, and AIX was commonly on the list of supported Unix flavours)