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This desk-sized machine used drum memory, displayed machine state as serial traces on a built-in oscilloscope, and drove an attached Flexowriter with paper tape reader/punch.
Purdue Electrical Engineering had a 4000 that they kept on the ground floor behind glass.
I can remember running the RPC 4000. A log book kept with the machine had instructions for starting and boot loading the machine. It also suggested that "personal edification" was an acceptable use and should be logged as such. I can't remember what I might have programmed. However, I do remember learning the word edification through the experience.