Vectoring through 24 was very important back in the core memory days
when the memory would still be there after a power failure and you
wnated the system to keep running, as was our Ontario Bellboy paging
controller.
cheers,
Nigel
On 30/03/2020 12:49, Paul Koning via cctalk wrote:
On Mar 30, 2020, at 10:17 AM, Robert Armstrong via cctalk
<cctalk@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?
paul
--
Nigel Johnson
MSc., MIEEE
VE3ID/G4AJQ/VA3MCU
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