29 Mar
2016
29 Mar
'16
6:13 a.m.
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 J?rg 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