On 25-May-20 09:29, Bob Supnik wrote: > 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 > Just for fun, I looked a bit further:
Here is the DC01-EB system exerciser test (diagnostic) in PDP-15 assembler: https://ia800403.us.archive.org/28/items/bitsavers_decpdp15diSystemExerciser19DC01EB_2205397/19_DC01EB.pdf It's rather entertaining reading. Would not like to be in the room when it runs (on 32 TTYs); it seems to mostly be good for finding crosstalk. But there's a lot to be gleaned from the code about how the DC01 works. Computerworld 17-Nov-1971 has a classified AD for a PDP-15 with DC01-EB, MUMPS, and other old friends: Enjoy.
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