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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