Editing AT&T Computer Systems (section)

==Formation post-divestiture==
After [[Breakup of the Bell System|divestiture of the Bell System]] on January 1, 1984, AT&T was required to put its computer business into a fully separated subsidiary called [[AT&T Information Systems]] (ATTIS, without the [[ampersand]] or [[hyphen]]). Software was developed in New Jersey (at [[Murray Hill, New Jersey|Murray Hill]], [[Summit, New Jersey|Summit]], [[Holmdel Township, New Jersey|Holmdel]], and [[Piscataway, New Jersey|Piscataway]]), and software, hardware, and system solutions were developed in [[Naperville, Illinois|Naperville]] and [[Lisle, Illinois|Lisle]], Illinois. After a couple of years of court hearings, AT&T was allowed to pull the business back into the mainstream corporate organization, and it was renamed AT&T Data Systems Group, which had three divisions: Computer, Terminals (the [[Teletype Corporation]] of [[Skokie, Illinois]]), and Printers. AT&T Data Systems Group was announced to the public in 1991. In 1992 the Terminals division was sold to [[Memorex]]-Telex, and the Printer division, which had only bought OEM equipment from Genicom, was phased out. By the mid-1990s, this left only AT&T Computer Systems.

AT&T Computer Systems (abbreviated AT&T-CS) was the home of the [[UNIX System V]] [[operating system]], originally developed in the Bell Labs Research Division. The important [[System V Interface Definition]] (SVID) was written, attempting to standardize the various flavors of [[Unix]], and define the official interfaces which made up a Unix operating system. In 1988, AT&T announced its intent to buy up to a 20% stake in [[Sun Microsystems]], a company then best known for making high-end Unix workstations.<ref>{{cite news
 | first = Burgess
 | last = John
 | title = AT&T to Buy Stake In Sun Microsystems
 | url = https://pqasb.pqarchiver.com/washingtonpost_historical/access/406816581.html?dids=406816581:406816581&FMT=ABS&FMTS=ABS:FT&date=JAN+07%2C+1988&author=John+Burgess+Washington+Post+Staff+Writer&pub=The+Washington+Post
 | work = The Washington Post
 | date = 1988-01-07
 | accessdate = 2007-01-23
 | quote = American Telephone & Telegraph Co. announced yesterday that it will buy up to a 20 percent stake in Sun Microsystems Inc., a Silicon Valley-based maker of powerful small computers known as workstations.
 | archive-date = 2007-03-27
 | archive-url = https://web.archive.org/web/20070327204639/https://pqasb.pqarchiver.com/washingtonpost_historical/access/406816581.html?dids=406816581:406816581&FMT=ABS&FMTS=ABS:FT&date=JAN+07%2C+1988&author=John+Burgess+Washington+Post+Staff+Writer&pub=The+Washington+Post
 | url-status = dead
 }}</ref> Upset at their academic-minded supplier (Bell Labs) now turned competitor (AT&T-CS), the "Gang of Seven" Unix system vendors founded the [[Open Software Foundation]] (OSF), each contributing source code from their UNIX SVR3 versions. AT&T founded the [[Unix International|UNIX International]] organization as a response to the OSF. But by the late 1980s, AT&T had almost given up, sold most of its stake in Sun, spun the Unix business off as [[Unix System Laboratories]] (which was later bought by [[Novell]]), canceled its [[Bellmac 32|WE 32000]] (aka BELLMAC) and [[AT&T Hobbit|CRISP]] (C Reduced Instruction Set Processor) microprocessor product lines, and just concentrated on networked server computer systems. See also [[Unix wars]].