-----Original Message-----
From: cctalk [mailto:cctalk-bounces at
classiccmp.org] On Behalf Of Jon Elson
Sent: 05 December 2015 18:03
To: General at
classiccmp.org; Discussion at classiccmp.org:On-Topic and Off-
Topic Posts
Subject: Re: Memory Voltage on MicroVAX II
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.
Jon
There seems to be a spike on the 12V supply, surely that isn't good, even if
it doesn't affect the memory?
Regards
Rob