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 does not respond. Since it takes the full 22-bit memory
space I can't see ho
Sounds familiar, got a picture of the board somewhere?
C
On 10/19/2021 12:57 PM, Nigel Johnson Ham via cctalk 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.
It's just a memory board and looks like one!
Picture here:
https://www.mediafire.com/file/ive7i7ax6zdibv3/Screenshot_20211019_185019.png/file
cheers,
Nigel
On 2021-10-19 5:21 p.m., Chris Zach via cctalk wrote:
> Sounds familiar, got a picture of the board somewhere?
>
> C
>
> On 10/19/2021 12
Hm, ok all my Plessy boards are dual height, 1mb boards. Are you sure
the 11/23+ is working, and do you have the CPU in slot 3 with the memory
board in slot 4 (staying away from the PMI slots)?
C
On 10/19/2021 6:51 PM, Nigel Johnson Ham via cctalk wrote:
It's just a memory board and looks lik
In all the hundreds of systems I have shipped, I have never put the CPU
in slot 3! I was VP Operations of Transduction, DEC's biggest components
group OEM in Canada.
No, I don't know if the CPU is good (it is a dual-width KDF11-A btw),
but it is in slot 1 AB with a DLV11J in slot 2AB. The memory
It can be done, technically the 11/83 and 11/93 put the CPU in slot 3
with the PMI memories in slots 1 and 2. Putting the CPU in slot one with
the PMI memory in 2 and 3 would just cause all memory access to slug
across the Q Bus.
So you can leave slots 1 and 2 open if you really want to, makes
Ah, well there you see the end of my technical knowledge.
When the 11/83 came out, I was already a manager :-)
Thanks for the info, I will try it and report back!
cheers,
Nigel
ps, No way is it PMI mmeory, it is waaay too old!
On 2021-10-19 11:03 p.m., Chris Zach via cctalk wrote:
> It can b
