29 Mar
2016
29 Mar
'16
4:19 a.m.
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
29 Mar
29 Mar
4:27 a.m.
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
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
8:36 a.m.
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 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
3190
days inactive
3190
days old
3 comments
4 participants
participants (4)
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derschjo＠gmail.com -
iamcamiel＠gmail.com -
j_hoppe＠t-online.de -
jnc＠mercury.lcs.mit.edu