Replacing MicroVAX II PSU With a Modern PSU

[Mark Wickens]

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.jarratt at 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
>
>