> > > There seems to be a spike on the 12V supply, surely that isn't good, even if > it doesn't affect the memory?
Often a spike on a particular output of an SMPSU is caused by a high ESR capacitor on that output. It's worth checking them. FWIW, old DRAMs, up to about 16Kbit size, often used +12V and -5V as well as +5V. Later/larger DRAMs are +5V only. I doubt you'll find any of the former in a VAX after early 11/700-series. -tony
