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UNIX System V
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=== SVR2 === [[File:VAX 11-780 intero.jpg|thumb|The [[Digital Equipment Corporation|DEC]] [[VAX-11/780]] was the porting base for SVR2.]] AT&T's UNIX Support Group (USG) transformed into the UNIX System Development Laboratory (USDL), which released System V Release 2 in 1984. SVR2 added [[Unix shell|shell]] functions and the [[System V Interface Definition|SVID]]. SVR2.4 added [[demand paging]], [[copy-on-write]], [[shared memory]], and record and [[file locking]]. The concept of the "porting base" was formalized, and the DEC [[VAX-11/780]] was chosen for this release. The "porting base" is the so-called original version of a release, from which all porting efforts for other machines emanate. Educational source licenses for SVR2 were offered by AT&T for US$800 for the first CPU, and $400 for each additional CPU. A commercial source license was offered for $43,000, with three months of support, and a $16,000 price per additional CPU.<ref>{{cite web |title=UNIX System V and add on applications prices |url=https://www.bell-labs.com/usr/dmr/www/licenses/pricelist84.pdf |publisher=AT&T International |date=24 February 1983 |access-date=24 January 2024}}</ref> [[Apple Computer]]'s [[A/UX]] operating system was initially based on this release. [[Xenix|SCO XENIX]] also used SVR2 as its basis. The first release of [[HP-UX]] was also an SVR2 derivative.<ref name="Rosen"/>{{rp|33}} Maurice J. Bach's book, ''The Design of the UNIX Operating System'', is the definitive description of the SVR2 kernel.<ref>{{Citation |last=Bach |first=Maurice |title=The Design of the UNIX Operating System |publisher=Prentice Hall |year=1986 |bibcode=1986duos.book.....B |isbn=0-13-201799-7 |url=https://archive.org/details/designofunixoper00bach }}</ref>
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