The perf board is my buffer board which has an op amp to increase the voltage from the DAC board glued to the corner. The other chip is a CMOS switch to disconnect the voltage under control of the BeagleBone. The enable line for it is connected to J7 pin 5.
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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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