Computer Dictionary/Berkeley Software Distribution
by Bill Joy and others at the [[Computer Dictionary/University of California at Berkeley|University of California at Berkeley]], originally for the DEC VAX and PDP-11 computers, and subsequently ported to almost all modern general-purpose computers. BSD Unix incorporates paged virtual memory, TCP/IP networking enhancements and many other features.
BSD UNIX 4.0 was released on 1980-10-19. The BSD versions (4.1, 4.2, and 4.3) and the commercial versions derived from them (SunOS, ULTRIX, Mt. Xinu, Dynix) held the technical lead in the Unix world until ATandT's successful standardisation efforts after about 1986, and are still widely popular.