This is the PDP-8 CPU. Similar to the straight 8 CPU backplane. The area without cards is for options such as EAE multiply/divide, D/A converter.
Feel free to contact me, David Gesswein firstname.lastname@example.org 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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