The Restoration of the PDP-8/I Minicomputer (PAGE 14)
Tested all three spare 4k core planes that I had; the one marked "Bad" is the only one that works! :-)
Now have 8k of memory.
It's interesting that both the planes that failed had similar problems; I could deposit nothing into
locations 0000 through 0077 (it always came back with zero), but I could deposit stuff into locations
0100 and on (one of the core planes had a stuck bit).
This is suspicious...