Yes, and if you plug one of their PMI memory boards into a Q/Q backplane, it will emit magic smoke, too! :-) I think that's why this thing has the jumpers - to allow it to be used in a Q/Q backplane. It would, of course, only be normal (slower) QBUS memory, but at least one could use it there. However, I am unable to verify that hypothesis. (See below.) I looked at the jumpers along the edge in the C/D finger region, and a lot of them _do_ connect to pins used in the PMI bus. (Confusingly, a number connect to _other_ pins - I can see I have some detective work in front of me here!) However, that made it likely that the one that had jumpers on all those pins was configured for PMI use, so I rolled the dice, and tried plugging that board into a Q22/CD backplane, along with a KDJ11-B, and after a short bout of 'tired memory' (see my previous post), it did come up as a 4MB PMI memory! (Parity, though, not CRC - which might make sense, I guess - it has 148 memory chips on it, which is a multiple of 37, so 32 + byte parity, plus a spare chip, I would guess?) However, when I plugged the other one in - nada. No response at all; the boot PROM bitched about 'no memory at 0'. So I'm not sure _what_ that configuration is for. So then I took a flier (although the cards use the identical PCB, they do have a few minor differences in chip rev in a couple of the programmable chips), and put the jumper config from the working PMI card onto the other card, and it did 'sort of' come up as a PMI card. The boot PROM was complaining about "Memory CSR Error" (I'll have to investigate that further), _but_ the memory was shown (by the boot PROM 'map' command) as PMI, and my own memory-test program showed it was all working OK. Well, at least we have a jumper config that allows us to use these cards as PMI memory! Noel