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UNIX Systems available
UNICS (Version Zero) PDP-7 Summer 1969 First Edition UNIX PDP-11/20 November 1971 Fifth Edition UNIX PDP-11/40 June 1974 Sixth Edition UNIX PDP-11/45 May 1975 Seventh Edition UNIX PDP-11/70 January 1979 Research UNIX 8 VAX-11/750 1981 AT&T UNIX System III PDP-11/70 Fall 1982 AT&T UNIX System V PDP-11/70 1983 AT&T UNIX System V 3b2/400 1984 4.3 BSD MicroVAX June 1986 2.11 BSD PDP-11/70 January 1992
