[Simh] Simulating the PDP-15/76 Unichannel

[Tom Morris]

The Unichannel 15 Overview manual in the Bitsavers collection has a pretty
good description of everything for those wondering about the details.

https://archive.org/details/bitsavers_decpdp15Un974_2578882

There's an additional component, the MX15-B memory multiplexer, which
arbitrates memory access (15 wins for simultaneous requests, otherwise,
first come, first serve) and implements byte read/write for the 11.  The
manual also shows the memory layout and how it maps on each system, as well
as a lot of other details of operation.

Tom
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