M7264 Troubleshooting

Mattis Lind mattislind at gmail.com
Thu May 23 07:38:25 CDT 2019

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

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


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