Plessy core memory

I've got a Plessey core memory manual somewhere, but I can't find it, so I don't know if it's the one you are looking for. I got it from Paul Birkel; it was a duplicate, and he scanned his and sent the scan off, but I don't think it made it online. It all depends on what kind of -11/10 you have. If yours is in a 5-1/4" box, you can't plug a DEC memory card into the SPC slots that some of the CPU-holding backplane versions have because DEC memories (other than the ones like the MM11-L and -U, which are multi-board core systems that require custom backplanes) all require MUD slots, not SPC. All of the CPU backplanes on that machine are for a _specific_ kind of core memory (MM11-L or MM11-U), see here: https://gunkies.org/wiki/PDP-11/05 There are I think some third-party memories which can be used (Dataram, maybe?) but I don't have time to go into them. If you have a 10-1/2" box, you can mount a MUD backplane - but you might still have an issue because the older BA11-D boxes use the old 9-pin power connectors, and the MUD backplanes (DD11-C, -D, etc) all use the newer 15-pin ones. (Again, there are some oddball ones, and again, I don't have time to go into them.) If you're lucky enough to have one of the ones that will take a MUD backplane, an MS11-E/F/H/J: https://gunkies.org/wiki/MS11_32KB_MOS_memory would be an option. The later /05's, /40's and /45's were the first ones to provide +20V, for the then-new MM11-U. On machines which took H744 'brick's, the _later_ harnesses could take a H754 +20V, -5V regulator 'brick'. Alternatively, _some_ BA11-L's (used for the /04 and /34) had the right version of H777: https://gunkies.org/wiki/H777_Power_Supply to provide +20V. Noel