DEC PDP-8/e H212 core mat repair

Yes most core stringing was outsourced.

... Rod Smallwood ? -- Digital Equipment Corporation? 1975 to 1985 On 19/07/2021 22:50, Jules Richardson via cctalk wrote: > On 7/19/21 3:40 AM, Joshua Rice via cctalk wrote: >> I believe much of the core manufacturing for DEC minicomputers was >> outsourced, but a lot of it had become much more automated by the >> late 60's and early 70's. > > I've got a trio of planes here, two of which are from a Lockheed > MAC-16, but the other one is made by Keronix out of Santa Monica for > an unknown machine (dated 1973, model number "P4" and p/n 816335 if > that means anything to anyone, approx 16"x16" with two 100-pin, > double-sided finger edge connectors on 0.1" spacing). > > Anyhoo, the Keronix one has a sticker on it saying it was repaired by > DMA, inc. in Amery, WI in 1980 - which might suggest that there were > third parties around working on boards, rather than them having to go > back to the manufacturer for repair. (I have no idea what the nature > of the repair was, of course; maybe it was to surrounding logic rather > than the mat itself). > >> It's worth noting that most computer manufacturers appreciated the >> fragility of core memory planes at the time, with most of them being >> protected with either PCB's or perspex/plastic shields on top of the >> core planes. > > Yes, that's how all the ones I've ever seen have been. The Keronix one > has an additional shield over the top of the entire PCB, on top of the > one protecting the cores. > > Jules