useful file, but was not successful.
> Thank you
> Eugene
>
>
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Al Kossow
> Sent: Sunday, January 22, 2017 5:59 PM
> To: cctalk@classiccmp.org
> Subject: Re: quick omnibus qu
> From: Eugene (W2HX)
> Before deleting this, someone ... should double check to make sure I am
> right that the file is incorrect. ... But it seems to be backward to me.
Well, it is, and it isn't. The board is drawn with the 'bottom' (in DEC
nomenclature, for when the board is insert
.nl site to suggest they
redo the otherwise useful file, but was not successful.
Thank you
Eugene
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Al Kossow
Sent: Sunday, January 22, 2017 5:59 PM
To: cctalk@classiccmp.org
Subject: Re: quick omnibus
On 1/22/17 2:05 PM, W2HX wrote:
> I hope this email can be found by the next guy searching for the omnibus
> details so they can avoid wasting time.
> THIS FILE IS WRONG
> http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8e/Omnibus_legenda.pdf
>
> This file shows the Omnibus signal
I would also do a cleaning of your empty backplane with a good vacuum cleaner
nozzle. It is not uncommon for bits of conductive detritus to fall into the
backplane over time. Given that the pins are adjacent on the connector it might
be a possible cause.
Vacuuming out any stuff that has accumu
Thanks to several who have made suggestions. Noel, Tony, Jim, and Paul thank
you. The system has been very thoroughly cleaned and the PS has been load
tested. The front panel has had some bulbs replaced as well.
I took all my boards (except the front panel) to a friend's house with a
working 8e
Hi Eugene,
You might want to test the over the top connectors. I don't remember the
part #, but they do go bad. They can be labeled and swapped with a spare if
have one. Just look to see if anything has changed after every change.
Dirty contacts and bad connections are always a problem.
I would
On 1/22/2017 12:17 PM, Tony Duell wrote:
On Sun, Jan 22, 2017 at 4:27 PM, W2HX wrote:
Hi friends.
I am 100% new to my pdp8e and I am troubleshooting a problem.
The problem is that whenever address bit 7 I asserted, I also see MD bit 4
asserted.
I am hoping there is a simple short somehow be
On Sun, Jan 22, 2017 at 4:27 PM, W2HX wrote:
> Hi friends.
> I am 100% new to my pdp8e and I am troubleshooting a problem.
> The problem is that whenever address bit 7 I asserted, I also see MD bit 4
> asserted.
>
> I am hoping there is a simple short somehow between these lines somewhere. I
> sh
> From: Eugene (W2HX)
> I noticed that B1J (MA7) is directly adjacent to B1K (MD4). Could this
> be related?
"Rule #1: There are no concidences." :-)
> I have the board sitting on my table with the components facing up and
> the omnibus card edge is at the bottom of the card.
10 matches
Mail list logo
