Multiprocessor Qbus PDP-11

Charles Dickman chd at
Thu Aug 19 18:39:10 CDT 2021

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?


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