> -----Original Message----- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jon Elson > Sent: 05 December 2015 18:03 > To: gene...@classiccmp.org; discuss...@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