Looking through the XVM/MUMPS15 listing, I saw that the timesharing
terminals were attached via a DC01 communications multiplexer. There's
no reference to such a device anywhere in the 18b literature on Bitsavers.
Because the PDP15 is a contemporary of the PDP8/I and the KI10, I
thought it might be a variant of their multiplexers, but I can't find a
match.
Another mystery.
/Bob
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