As always, the CHWiki is available for any vintage computer stuff. I can set up an account for anyone here who wants one. I have posted similar information for PDP-11 memory, e.g. here: http://gunkies.org/wiki/QBUS_memories#Diagnosing_DRAM_memory_failures http://gunkies.org/wiki/MSV11-J#Technical_information which seems to be a direct analogue of the stuff you have. Noel