Mouse Pissed! Need power supply help

[Julian Wolfe]

Interesting, I was never aware that the 11/03 and 23 had different boxen
than the 11/23plus, though I knew the power supplies were different.
Speaking to my local DEC salvage dealer, he told me he used to get whole
11/780s just for the power supplies in the front end 11/03s.  However,
judging from the number of 23plus systems that were sold (and have recently
hit, if not flooded, the used market)I'd say it should be fairly easy to
find a cheap H7861 supply.

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
> On Behalf Of Pete Turnbull
> Sent: Wednesday, November 23, 2005 11:52 AM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Mouse Pissed! Need power supply help
> 
> 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