-- Original Message --
From: "Nigel Johnson Ham via cctech"
To: "Jerry Weiss via cctech"
Sent: Thursday, 21 Oct, 2021 At 01:10
Subject: Re: Looking for info on memory
Thanks for that, but unfortunately it is crashing into ODT and not
accepting input from the console, which I remember
Thank you Josh, my next move will be to get a different memory.
Like you say, Even an MSV11DDD will help sort it out. I only need enough
to get into ODT, and maybe run some XXDP. I have tried two CPUs and two
J boards, so it is either the memory of backplane!
cheers,
Nigel
On 2021-10-21 4:29
> On 10/19/2021 12:57 PM, Nigel Johnson Ham via cctech wrote:
>> I am trying to bring up an 11/23 system in a BA23 box, and the only
>> memory i have is an obscure Plessey one. The only identification is the
>> p/n 705920 with dash-100 in white ink. By counting the chips I make it
>> 4MB, but it
Thanks, but like bitsavers they are all older that the one I have.
To be honest, I never saw anything Plessey bigger than 128kB in the
wild, so I have to wonder what kind of machine this board came from,
although it was in a pile of Qbus things that I got the J boards from.
I'm thinking that mayb
On 10/20/21 7:10 PM, Nigel Johnson Ham via cctalk wrote:
Thanks for that, but unfortunately it is crashing into ODT and not
accepting input from the console, which I remember was a symptom of no
bank 0 memory.
Now,of course, it could be the receiver chip in the J board (I used to
make a lot of m
On 10/21/2021 9:10 AM, Nigel Johnson Ham via cctalk wrote:
Thanks, but like bitsavers they are all older that the one I have.
To be honest, I never saw anything Plessey bigger than 128kB in the
wild, so I have to wonder what kind of machine this board came from,
although it was in a pile of Q
No luck, there are no 12V traces continued to the edge connector, and
the 5VB goes to a three way jumper post where the jumper is between the
common and 5V
Besides, there are two LEDs on the board that light up, one red one green.
Thanks,
Nigel
On 2021-10-21 10:58 a.m., Chris Zach via cctalk w
A couple of comments on a number of things touched on in this thread:
> From: Nigel Johnson Ham
> Ah, well there you see the end of my technical knowledge.
My observation is that since varying QBUS PDP-11 CPU's can be swapped in and
out (unlike UNIBUS PDP-11's, where the CPU's backplane
Hey, FoothillsGeek here! I saw this thread last night and checked to see if
I had a manual for it - it does not look like I do. Most of the Plessey
documents we received are for core memory boards.
However, when I indexed the docs we received, I did so by model number
(PM-) and not by part num
I’m having a general clear out and the following are free for the collection
rather than they go in the skip/dumpster.
Most if not all were working when put away but I can’t offer any guarantees.
Preference will be given to anyone who will take all of them.
Photos are available if required, if
I really appreciate that, all the things I can find under that board
number (which is simple the pcb etch) are from vendors who want to sell
you one and have no idea of the model number.
I too, have no idea of the model number, but have tried search for all
sorts of PM-MSV11 etc with no luck.
I w
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