Front of the G840C Light Pen Amplifier. This board converts the output from a 375 light pen which was not present with unit when I got it to a TTL output. If you have a spare 375 light pen I would be interested in it.
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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