Before MUMPS-11, there was MUMPS-15. It is the only one of the PDP-15's
DEC operating systems that is still missing. TA PDF assembly listing of
XVM/MUMPS-15 (or perhaps only part of it) exists, but it is scribbled
over in places, as though it were a developer's "in progress" listing.
There's also a pocket card for a PDP-9 timesharing system developed at
the Ontario Institute for Studies in Education. No other trace has been
found.
/Bob
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