Thanks Mark, I probably don't have space for another one really, and yours is the one in the big enclosure anyway (like this: http://www.trailingedge.com/comphave.html?theKey=deccmicrovax2&byCompany=0), if I remember right, which has a different PSU. Mine is one of these: http://www.cosam.org/images/uvaxii/front.jpg
We should try to get that one of yours working at the next Legacy. Have you thought about whether to go for April? Regards Rob > -----Original Message----- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mark > Wickens > Sent: 24 November 2015 23:52 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: Replacing MicroVAX II PSU With a Modern PSU > > I haven't looked into this at all and I suspect it's probably quite tricky > indeed. I > did look around a while back drew a blank. > If you need another dead MV2 let me know, the one I collected is still sat in > the > garage. > > Regards, > Mark. > > On 20 November 2015 at 00:00, Robert Jarratt <robert.jarr...@ntlworld.com> > wrote: > > > While I look into what is wrong with my H7864, I'd like to use a > > modern PSU to power my machine (actually an rtVAX 1000). > > > > > > > > I think I would need to deal with the following problems: > > > > > > > > 1. Finding the right connectors (ideally, I am sure I could rig up > > something more temporary). > > > > 2. A way to power the fans, which I believe are 15V, perhaps they > > would run on 12V as I wouldn't run the machine for long periods > > anyway, or I could just use PC fans. > > > > 3. Emulate the DC OK and P OK signals, I suspect these would be > > simple > > +5V signals which could perhaps just come from the +5V of the PSU > > +anyway > > (unless there is a problem with that). > > > > 4. The most difficult bit, I suspect, would be the PSU LTC signal , > > which I believe is some kind of clock. I don't know what the spec of > > the signal is, but I will get a scope on a working one to see (NB > > don't want to risk a working PSU on this machine in case it was a > > problem with the machine itself that caused the first PSU to fail, I > > don't mind sacrificing a modern PSU if need be). > > > > > > > > Has anyone done this before? > > > > > > > > Regards > > > > > > > > Rob > > > >
