Memory Voltage on MicroVAX II
ard at p850ug1.demon.co.uk
Sat Dec 5 13:12:22 CST 2015
> 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
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