Mouse Pissed! Need power supply help

Pete Turnbull pete at
Wed Nov 23 11:51:31 CST 2005

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

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