DEC PDP-8/e H212 core mat repair

Tom Hunter ccth6600 at
Mon Jul 19 00:33:59 CDT 2021

I am curious if anyone has attempted to repair (replace) a broken wire in a
PDP-8/e H212 (MM8EJ) core mat (8 k word). The cores are not visible without
a microscope. I cannot imagine how these were even manufactured and wonder
if DEC service centers repaired core mat faults or if faulty boards were
simply discarded.

CDC 6600 cores were huge in comparison and I would not hesitate to replace
a broken core wire on those.

Best regards
Tom Hunter

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