I finally borrowed a digital camera to photograph the damage to my PDP-8/L
parity core stack. The damage is more extensive than I remember. There
are the two main areas, but in addition, there are single bits that are
missing here and there over the entire area. I do not think it is possible
to repair this board without rewiring at least the four core mats on this
PCB in toto... that's 128x128 cores for the folks keeping score at home. The
wire density is approx 32 per inch. Much work. I won't be doing this anytime
soon.
Here's some photos of that stack I got back in '82 with a partial PDP-8/L
http://www.infinet.com/~erd/retrcomputing/pdp8/pix/coreassy.jpg - external view
http://www.infinet.com/~erd/retrcomputing/pdp8/pix/coremat1.jpg - one bad mat
http://www.infinet.com/~erd/retrcomputing/pdp8/pix/coremat2.jpg - another one
Thanks for all the responses to my original questions. I'm somewhat gratified
to see that the can of worms that this thread opened has been strangely on
topic. I'm especially interested in hearing the results of the #2 nut core,
if it's suitable for display purposes.
-ethan
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Received on Sun Apr 25 1999 - 17:34:52 BST
