H7874 power supply
nw.johnson at ieee.org
Mon Mar 30 11:52:11 CDT 2020
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
On 30/03/2020 12:49, Paul Koning via cctalk wrote:
>> 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?
Amateur Radio, the origin of the open-source concept!
You can reach me by voice on Skype: TILBURY2591
If time travel ever will be possible, it already is. Ask me again yesterday
This e-mail is not and cannot, by its nature, be confidential. En route from me to you, it will pass across the public Internet, easily readable by any number of system administrators along the way.
Nigel Johnson <nw.johnson at ieee.org>
Please consider the environment when deciding if you really need to print this message
More information about the cctalk