What was the most popular operating system on the PDP-11 computers?
And is it known what percentage of PDP-11 computers used this operating system?
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I'm only guessing, but I would guess in the late '70s and early '80s either
RSTS/E for traditional timesharing use
RSX-11M for real-time application use; maybe this transitioned to RSX-11M-Plus as larger memories became common
I have no data for this, just an impression of what was going on in DEC while I was there. I'd be interested in numbers if anyone can come up with them. The answer should in principle be knowable for DEC systems, since software came with a price tag.