Editing UNIX/32V (section)

==Overview==
[[File:System7simh-coolrt.png|thumb|Version 7 Unix for the VAX 11/780, running in the SIMH VAX 11/780 simulator displayed on Cool Retro Term]]

Before 32V, Unix had primarily run on DEC [[PDP-11]] computers. The Bell Labs group that developed the operating system was dissatisfied with DEC, so its members refused DEC's offer to buy a VAX when the machine was announced in 1977. They had already begun a Unix port to the [[Interdata 8/32]] instead. DEC then approached a different Bell Labs group in [[Holmdel, New Jersey]], which accepted the offer and started work on what was to become 32V.<ref name="penguin">{{cite book |first=Peter H. |last=Salus |authorlink=Peter H. Salus |title=The Daemon, the Gnu and the Penguin |chapter=Chapter 6. 1979 |url=http://www.groklaw.net/article.php?story=20050502114023686 |publisher=[[Groklaw]] |year=2005}}</ref>

Performed by Tom London and John F. Reiser,<ref name="reader">{{cite tech report |first1=M. D. |last1=McIlroy |authorlink1=Doug McIlroy |year=1987 |url=http://www.cs.dartmouth.edu/~doug/reader.pdf |title=A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986 |series=CSTR |number=139 |institution=Bell Labs}}</ref> porting Unix was made possible due to work done [[Version 6 Unix#Portability|between the Sixth and Seventh Editions]] of the operating system to decouple it from its "native" PDP-11 environment. The 32V team first ported the C compiler (Johnson's [[Portable C Compiler|pcc]]), adapting an assembler and loader written for the Interdata 8/32 version of Unix to the VAX. They then ported the April 15, 1978 version of Unix, finding in the process that "[t]he [[Bourne shell|(Bourne) shell]] [...] required by far the largest conversion effort of any supposedly portable program, for the simple reason that it is not portable."<ref>Thomas B. London and John F. Reiser (1978). [https://www.bell-labs.com/usr/dmr/www/otherports/32vscan.pdf A Unix operating system for the DEC VAX-11/780 computer]. Bell Labs internal memo 78-1353-4.</ref>

UNIX/32V was released without [[virtual memory]] [[paging]], retaining only the swapping architecture of Seventh Edition.  A virtual memory system was added at [[University of California, Berkeley|Berkeley]] by [[Bill Joy]] and [[Özalp Babaoğlu]] in order to support [[Franz Lisp]]; this was released to other Unix licensees as the Third [[Berkeley Software Distribution]] ('''3BSD''') in 1979.<ref name="opensources">{{cite encyclopedia |title=Twenty Years of Berkeley Unix: From AT&T-Owned to Freely Redistributable |first=Marshall Kirk |last=McKusick |authorlink=Marshall Kirk McKusick |encyclopedia=Open Sources: Voices from the Open Source Revolution |year=1999 |publisher=O'Reilly}}</ref> Thanks to the popularity of the two systems' successors, 4BSD and [[UNIX System V]], UNIX/32V is an antecedent of nearly all modern Unix systems.