it was on a Purdue Dual Vax 11/780
much later DEC sold the 782 which was a
commercially produced version of the
Purdue Dual VAX 11/780 which was built
from one machine and a bunch of "spares".
George Goble produced the parts list to
order from DEC Spares to build your own.
several got built.
very fine-grain-locked systems often display convoying and
are prone to priority inversion problems. coarse-grained
systems exhibit all the granularity problems already described.
(the first purdue dual-vax system plowed most of that ground)
we published the best Unix SMP paper I've ever seen in
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