23 Nov
2005
23 Nov
'05
9:51 a.m.
On Nov 23 2005, 10:51, Charles wrote:
I've found the reason why my PDP-11 power supply
(H7861) is not
putting out POK and DCOK signals.
[ ... ]
Unfortunately the H780 schematic does not match
closely (they use
74123's while this one uses 555's, for example) so it'll be hard
to figure out the missing or unreadable parts anyway!
The H7861 is a reworked version of the H786 design, which is fairly
different from the H780. The H786 is used in the BA11-N box commonly
used for PDP-11/03 and 11/23 systems, and the H7861 is used in the
BA11-S box commonly used for 11/23plus and 11/73S systems, so you
should be able to find the schemeatics amongst the BA11-{N,S} drawings.
--
Pete Peter Turnbull
Network Manager
University of York