------ Original Message ------
From: "Tom Hunter via cctalk" <cctalk@classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk@classiccmp.org>
Sent: Monday, 19 Jul, 2021 At 06:33
Subject: DEC PDP-8/e H212 core mat repair
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
These patents might be enlightening. I'm sure there's others, but these
are some i've found on a quick search.
https://patents.google.com/patent/US4161037A
<https://patents.google.com/patent/US4161037A>
https://patents.google.com/patent/US3668664
<https://patents.google.com/patent/US3668664>
Josh
