Looking for info on memory
Nigel Johnson Ham
g4ajq1 at gmail.com
Sat Oct 23 12:46:05 CDT 2021
Thanks for the links, but I already have the config data, it was only
the engineering drawings that I lost after I left the DEC business!
The 11/23 you supplied was originally configured to power up through 24,
indicating it was used on a battery-backed-up system, so I changed that
one to go directly to ODT. I got an 11/73 from another collector and
left that one to power up to 173000.
I know from years of experience as an FE and running a production line
that an 11/23 will not work without bank zero memory, hence the title of
this email chain.
So while I appreciate everybody's help, there is no point in scratching
your heads! If I cannot find any data on the Plessey memory I will just
have to look for an MSV11-DD or something to give me at least some
memory to start off with!
cheers,
Nigel
The 11/23 you supplied was
On 2021-10-23 1:34 p.m., Josh Dersch wrote:
> On Sat, Oct 23, 2021 at 10:30 AM Josh Dersch <derschjo at gmail.com
> <mailto:derschjo at gmail.com>> wrote:
>
>
>
> On Sat, Oct 23, 2021 at 10:12 AM Nigel Johnson Ham via cctalk
> <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
>
> It is not possible to get ODT running without bank 0 memory.
> All I get
> is output of 173000 and the no ability to input.
>
>
> How is your CPU board configured? Based on the above, it sounds
> like it's set up to jump to a ROM bootstrap at power-up (at
> 173000) and I'm guessing given your current configuration that
> there isn't one. Without memory present/functional, this may be
> confusing things further. There are jumpers on the 11/23 CPU to
> select what the CPU does at power-up (see:
> https://gunkies.org/wiki/KDJ11-A_CPU
> <https://gunkies.org/wiki/KDJ11-A_CPU>). Try setting it to drop
> directly into ODT instead.
>
>
> Sorry, just realized I pasted a link for the 11/73 CPU config (same
> basic idea, though). Try this instead:
> http://www.willsworks.net/pdp-11/boards#KDF11-BA
> <http://www.willsworks.net/pdp-11/boards#KDF11-BA>.
>
> - Josh
>
>
>
> - Josh
>
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