And AFAIK there is no MMU for the PDP11/20 (the first
PDP11
Not as a product. However, lo these many years ago (neigh
on to 3 decades), I was shown an object that consisted of
numerous DEC modules and told that it was one of three MMUs
that had been built for the 11/20. Since we also had an
11/20 there, it was at least plausible. To my knowledge,
it was later lost to a great clean-out. Now, I have no
idea whether it really was an 11/20 MMU, but I do recall
a while back coming across a mention of what sounded like
an experimental MMU for it. So such a thing did exist
in legend and myth...
BLS