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Message * Articles On Discontinued Operating Systems, including Beos, Kent Applicative Operating System, Multics, Os/2, Sunos, Ucsd Pascal, 386bsd, Nextstep, Rsx-11, Tripos, Ibm Pc Dos, Atheos, Arthur (operating System), 86-dos, Ultrix, Mac Os 9 - 1244114871 - 9781244114876