This is the back of the Calcomp 563 incremental plotter. The round multi pin connector is the connection to the control board in the PDP-8.
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Feel free to contact me, David Gesswein djg@pdp8online.com with any questions, comments on the web site, or if you have related equipment, documentation, software etc. you are willing to part with. I am interested in anything PDP-8 related, computers, peripherals used with them, DEC or third party, or documentation.
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