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

[Josh Dersch]

Consider yourself lucky -- when I hit this issue about this time last year
(maybe it's seasonal?) I got excoriated off-list by a particularly irate
listmember for not having the foresight to just try reversing the cable
before asking on the list... :)

- Josh

On Tue, Mar 29, 2016 at 6:13 AM, Camiel Vanderhoeven <iamcamiel at gmail.com>
wrote:

> It's done on purpose, sort of an initiation rite. All traces of this
> conversation will be wiped out so future /34 owners won't miss out on this!
> ;-)
>
> Camiel.
>
> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jörg
> Hoppe
> Sent: dinsdag 29 maart 2016 13:28
> To: General Discussion: On-Topic and Off-Topic Posts <
> cctalk at classiccmp.org>
> Subject: Re: PDP-11/04-34 Programmer's Console manual error
>
> Noel,
>
> this is something every '34 owner must go through. Welcome to the club ;-)
>
> Joerg
>
> 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
> >
>
>