23 Oct
2021
23 Oct
'21
10:46 a.m.
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