PDP-11/04-34 Programmer's Console manual error

Jörg Hoppe j_hoppe at t-online.de
Tue Mar 29 06:27:31 CDT 2016


this is something every '34 owner must go through. Welcome to the club ;-)


Am 29.03.2016 um 13:19 schrieb Noel Chiappa:
> So, something I just found out the hard way, while debugging another
> 'situation' with a PDP-11/04:
> The KY11-LB Programmer's Console maintainence manual contains a major error,
> in describing the configuration of the 20-conductor flat cable that connectors
> the front panel and the UNIBUS interface module (M7859). This is covered in
> Chapter 9, "Installation", which includes two figures, Figures 9-4 and 9-5.
> Those figures show the 20-conductor flat cable with the red edge stripe
> toward the outer edge of the front panel PCB (correct), and also toward the
> outer edge of the M7859 (WRONG). On the M7859, the red stripe edge needs to
> be oriented _away_ from the outer edge of the board.
> If it is plugged in as shown in these figures, the machine will not operate:
> the four 'RUN/SR DISP/BUS ERR/MAINT' lights will be on, but nothing else, and
> it will not respond to any keys. Fortunately, plugging the cable in reversed
> does not damage anything; simply reverse the cable.
> 	Noel

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