[vcf-midatlantic] PDP-11 topics again.

Dave Shevett shevett at pobox.com
Tue Mar 15 16:46:43 UTC 2022

Hahhahahah.  FUNNY BIT HERE.

check this out.  someone sent me these because they just had them lying around

They're literally decoration on my wall.  They're 11/03's.  What are
the chances of these working?  :)


Here's the other problem.  The console on the /73 is on the mainboard.
I have a pair of DLV11J's I could use - same pinning, but I'd need to
identify the console somehow.  Hmmmmm.  (googles a bit) Ahhh, the
DLV11J can be jumpered to say I AM THE CONSOLE.


I think I've found my project for tonight.

Dave, thanks for the info on the 11/03 - I was almost sure the Qbus
CPUs were all switchable, but thanks for the validation.  For some
reason I was lumping in an 11/05 which didn't make any sense
whatsoever.  And yeah, that machine Im' probably went to some poor
slob who I'm sure never did anything with it.  We never got it past
like instruction 8 in the bootstrap.

On Tue, Mar 15, 2022 at 12:18 PM Dave McGuire via vcf-midatlantic
<vcf-midatlantic at lists.vcfed.org> wrote:
> On 3/15/22 10:22, Dave Shevett via vcf-midatlantic wrote:
> > I would be keen on coming down for the repair fest with my 11/73 if
> > someone has a spare KDJ11 CPU board that I can swap into this chassis
> > to see if this is the ONLY fault I'm seeing.
> >
> > I've found other boards on ebay but the lowest price is $400, and
> > that's a lot of money to toss out when I'm not sure the rest of hte
> > machine is functional.
> >
> > Anyone got a board I can test with?
>    I can send you one if you don't find one sooner.  I should be able to
> get one tested and shipped by Thursday or Friday.  Let me know.
> > I don't... know if a low end CPU will work here (IE an 11/03 or an
> > 11/05).  I'm willing to strip the backplane and try it with the serial
> > boards.
>    The 11/05 is Unibus; the predecessor of the 11/04, one that you know
> very well. :-)  (whatever happened to that system?)
>              -Dave
> --
> Dave McGuire, AK4HZ
> New Kensington, PA

Dave Shevett
shevett at pobox.com

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