On 2021-07-19 6:06 p.m., Rod Smallwood via cctalk wrote: > > Yes most core stringing was outsourced. >
There's more detail on early core production in the book "IBM's Early Computers", iirc. (And possibly "A Few Good Men From Univac".) > ... > 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
