UNIX/32V was an early version of the Unix operating system from Bell Laboratories, released late in 1978. 32V was a direct port of the PDP-11 Seventh Edition Unix to the Digital Equipment Corporation VAX architecture. UNIX/32V was released without paging virtual memory, retaining only the swapping architecture of Seventh Edition. A virtual memory system was added at Berkeley by Bill Joy and others to support Franz Lisp ; this was released to other Unix licensees as the Third Berkeley Software Distribution (3BSD) in 1979. An independent implementation of virtual memory was done at AT&T's UNIX Support Group for the UNIX System III release in 1982. Thanks to the popularity of the two systems' successors, 4BSD and UNIX System V, UNIX/32V as an antecedent of nearly all modern Unix systems.

Reference

• Marshall Kirk McKusick and George V. Neville-Neil , The Design and Implementation of the FreeBSD Operating System (Boston: Addison-Wesley, 2004), ISBN 0-201-70245-2, pp. 4–6.