[Fwd: Restoration of a PDP-8a]

From: anders at abc80.net Wednesday, December 04, 2013 12:00 PM Charles Morris and I that did some PCBs for replacement 8A programmer's panels. He got his working, but I ended up getting an original, so while my prototype got built, it never got debugged. As I recall, the issues were with the power and ground planes (those boards have some very long power runs, and they were ringing a bit), and a consistency issue with the naming of pins on the interconnect between the boards (one drawing has bit 0 as LSB, the other as MSB). Once those were worked out, the boards worked. They are a pair, mounted back-to-back, each replacing one side of the original pair. Anyway, I think I have a few more PCBs, if you are interested. I think I also have some stock for the buttons, LED digits, and a few of the more exotic (LS367 and LED drivers, IIRC) ICs. I think there was also some front panel work on laying out the artwork. I used a cardboard mock-up printed on my inkjet, but I think Charles ordered one from FP Express. I'd have to check my records. (That, of course, would be the single most expensive part.) Oh, here's a link to a picture of Charles' panel: http://i1181.photobucket.com/albums/x426/DrCharlesMorris/PDP8A.jpg Vince