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Old 25th Feb 2022, 6:42 pm   #19
Mark1960
Octode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 1,265
Default Re: Genuine DS1210 NVRAM controllers

I think on power off the supply voltage would drop quite slowly, at least in microprocessor terms. As it drops the processor might start doing random things including writes to memory.

I might still have the schematic of a z80 processor board with 56k battery backed ram, if I can find it still. It monitored the 50Hz from the power supply to force reset and write protect if power was cut.
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