@tig said:
I worked on a similar 'Calcomp IGS 500' setup at the very same time - it was in the UK [it was the 1st CAD installation in England!]...
By the late 80s I was working on 'Silicon Graphics Indigos' using 'Sonata' [the grandpa of Revit]...
The digitizers were Calcomp, but the equipment was manufactured by a California company, which was purchased by GE around 1979.