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There are so MANY more than this!
For a partial list see the PDP-11 Emulation Webpage:
http://www.aracnet.com/~healyzh/pdp11emu.html
For a "complete" list see:
http://www.village.org/pdp-11/faq.pages/pdpOSes.html
Depending on how you count there is something like 20-34 different OS's.
Zane
Not listed on the "complete" list is XINU, which is an educational
operating system developed at Purdue University by Dr. Comer (his
students, and others) and was taught on LSI-11s for a number of
years before newer more modern processors took their place.
"XINU" == "Xinu Is Not Unix"
--tom