M7264 Troubleshooting

[Mister PDP]

Ok, small update. My M8043 (DLV11-J) just arrived today. It seemed in good
condition so I confirmed it was set up correctly (9.6k baud and console on
J3), built a serial cable from the information provided on gunkies, and put
it into my system. Sadly, it behaves exactly how it did with the M8017. No
output, no activity on the BRPLY line. I have a hard time imagining that
both my M8017 and my M8043 are bad, but it could still be possible.

On Thu, May 23, 2019 at 7:38 AM Mattis Lind via cctalk <
cctalk at classiccmp.org> wrote:

> Den tors 23 maj 2019 kl 14:14 skrev Noel Chiappa via cctalk <
> cctalk at classiccmp.org>:
>
> >     > From: Jon Elson
> >
> >     > Yes, this is most likely a bus timeout
> >
> > The good news is that it looks like his CPU is 'mostly' working; and if
> > the NXM is due to a fault on the CPU (e.g. bad bus transceiver sending
> > the wrong address), that would be fixable (it uses 8641's).
> >
> > If the fault is in the DLV11-E (and not just misconfiguration), depending
> > on
> > where the fault is, he might be out of luck with that card; it uses
> DC005's
> > for transceivers, which of course are unobtainium now.
>
>
> Not really unobtainium: https://www.ebay.com/itm/281679682476 and
> https://www.ebay.com/itm/253305313497
>
> These DC0xx chips can sometimes be found on Ebay under their Signetics
> name.
>
> DC003 C2293N
> DC004 C2301N
> DC005 C2324N
> DC006 C2345N
> DC010 C2344N
>
>
>
>
> > Still, QBUS serial
> > interfaces are not rare.
> >
> > And overall, progress is being made! :-)
> >
> >     Noel
> >
>
> /Mattis
>