PT-210 Serial Board

[dave at 661.org]

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/

-- 
David Griffith
dave at 661.org

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