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 email@example.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