A few years ago I entered the schematics and laid out a design for the serial board option for the TRS-80 PT-210 printing terminal using gEDA. I found the schematics in a hardcopy of the service manual[1]. I revisited the project a couple of days ago and reentered the schematics into Kicad. I remembered that the reason I never made the board was that I was unsure of its correctness. The schematics and foil patterns contradict slightly and a couple wires seem to be missing from the schematic.
Does anyone here have a PT-210 with a working serial board? I would like to work with you to beep out various points so I can figure out what's wrong.
I also found a Youtube video showing a PT-210 with the serial board in action. See https://www.youtube.com/watch?v=FPxpzcFXh-0
[1] Scanned and uploaded to http://chiclassiccomp.org/docs/content/computing/RadioShack-Tandy/
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