Memory Voltage on MicroVAX II

Jon Elson elson at
Sat Dec 5 12:03:17 CST 2015

On 12/05/2015 09:51 AM, Robert Jarratt wrote:
> I finally fixed my H7864 PSU so I can now run my rtVAX 1000. However, I
> think the machine is damaging memory boards. I checked the ripple and 5V
> looks OK, but 12V looks suspicious. Is the 12V supply used by the memory?
I don't have my print set anymore, but I highly doubt it.  I 
think the +/- 12 V is only used by serial comm boards, and 
possibly by some graphics boards.  I would not be surprised 
if the regulation of the 12 V supplies is not very precise.


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