Multiprocessor Qbus PDP-11

Zane Healy healyzh at
Fri Aug 20 09:49:34 CDT 2021

On Aug 19, 2021, at 4:39 PM, Charles Dickman via cctalk <cctalk at> wrote:
> There are indications in the KDJ11-B processor spec on bitsavers that the
> M8190 could be used in a multiprocessor configuration. For example, bit 10
> of the Maintenance Register (17 777 750) is labeled "Multiprocessor Slave"
> and indicates that the bus arbitrator is disabled. There is also section
> 6.6, "Cache Multi-Processor Hooks", that describes cache features that
> allow multiprocessor operation.
> Would it be as simple as connecting to 11/83 qbus together? And adding the
> proper software.
> Anybody ever heard of such a thing?
> Chuck

Have you looked at the Falcon PDP-11/21 boards?  Perhaps this is for them?  I’ve never had a Falcon board, so haven’t really read up on them.


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