Comment PDP-8 ! (Score 1) 620
At work we have a PC Board component inserter robot that runs off a PDP-8. Programmed with paper tape. Yes. Paper tape. OK, well, plastic punched tape. There is a short stack of 'spare' PDP-8 rack units sitting in the crib just waiting for a failure. But you know what ? Digital Equipment made some rugged machines.
And in my old job in the defense industry we used a surplus Nike-Ajax missile radar, that was run off a synchro computer. I designed a digital interface to run it off a Z-80 processor.