H7874 power supply

Paul Koning paulkoning at comcast.net
Mon Mar 30 11:49:47 CDT 2020

> On Mar 30, 2020, at 10:17 AM, Robert Armstrong via cctalk <cctalk at classiccmp.org> wrote:
>> Looks like for this enclosure an ATX supply could well work.
>> For my VAX my notes say it didn't.
>  A VAX would certainly be harder.  You'd have to kludge up the ACOK and DCOK signals for one thing, which I don't think the R400x uses.

Thise signals don't seem like a problem: just hardwire them to the desired logic level.  PDP-11s need a real functioning DCOK signal iff you want to do power fail interrupt handling, otherwise they don't.  Do VAXen have power fail interrupt?  If yes, does anyone actually use it?


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