Editing UNIX System V (section)

=== SVR3 ===
[[Image:3B2_model_400_sitting_on_grass.jpg|thumb|The AT&T [[3B series computers#3B2|3B2]] line of [[minicomputer]]s was the porting base for SVR3.]]

AT&T's UNIX System Development Laboratory (USDL) was succeeded by AT&T Information Systems (ATTIS), which distributed UNIX System V, Release 3, in 1987.<ref>{{citation | author=Marshall Kirk McKusick | author-link=Marshall Kirk McKusick | chapter=History of the UNIX System | title=The Design and Implementation of the FreeBSD Operating System | edition=2nd | year=2015 | pages=23–28}}</ref> SVR3 included [[STREAMS]], [[Remote File Sharing]] (RFS), the File System Switch (FSS) [[virtual file system]] mechanism, a restricted form of [[shared library|shared libraries]], and the [[Transport Layer Interface]] (TLI) network [[application programming interface|API]]. The final version was Release 3.2 in 1988, which added binary compatibility to [[Xenix]] on Intel platforms (see [[Intel Binary Compatibility Standard]]).

User interface improvements included the "layers" windowing system for the [[Blit (computer terminal)|DMD 5620]] graphics terminal, and the SVR3.2 [[curses (programming library)|curses libraries]] that offered eight or more color pairs and other at this time important features (forms, panels, menus, etc.). The [[3B series computers#3B2|AT&T 3B2]] became the official "porting base."

[[SCO UNIX]] was based upon SVR3.2, as was [[Interactive Systems Corporation|ISC]] [[Interactive Unix|386/ix]]. Among the more obscure distributions of SVR3.2 for the 386 were ESIX 3.2 by [[Everex]] and "System V, Release 3.2" sold by Intel themselves; these two shipped "plain vanilla" AT&T's codebase.<ref name="IW1989">{{cite journal|author=Jeff Tye|title=Other OSs That Run Unix on a 386|url=https://books.google.com/books?id=ijAEAAAAMBAJ&pg=PT77|date=10 July 1989|journal=InfoWorld|pages=62|issn=0199-6649}}</ref>

[[IBM]]'s [[AIX operating system]] is an SVR3 derivative.