From some Foxboro brochure scans that I have: M/97400 - Mar 1964 based on the PDP-5 SPC400 - Apr 1969 based on the original PDP-8 FOX-1 - Jan 1971 FOX-2 - Jan 1972 based on the PDP-11/20 I'll see about getting these up on bitsavers as well. The Fox-1 CPU cabinet is pretty strange. It is 'X' shaped.