Curiously enough, 11/782 and other MA780-based models were not the only
multiprocessor design based on the 11/780.
Some brave souls just took out the SBI terminator and hooked in a second KA780
CPU in its place, using the created dual-processor machine to develop what
appears to be the very first multiprocessor version of UNIX (based on 4.1/4.2).
Both processors (master and slave) shared the SBI, IO adaptors and single-port
(MS780) memory.
http://dl.acm.org/citation.cfm?id=801738
According to the lore, the whole story started with a 780 being dropped off a
truck...
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