Editing AT&T Computer Systems (section)

==3B series computers==
{{Main|3B series computers}}

Throughout the 1980s and early 1990s, AT&T-CS produced many "firsts" in the computer world, besides the UNIX operating system itself. The 3B5 and 3B15 were the first computers to be designed with the 32-bit WE 32000 microprocessor, and the 3B15 was the first computer to run a [[demand paging|demand-paging]] version of Unix. There was a project, codenamed "Alice", to develop the 3B5 into an asymmetric multiprocessor with 3 [[CPU]]s, but this was canceled in favor of the demand paging 3B15 project, and a few of the "Alice" participants left the company and went to [[Sequent Computer Systems]].

The 3B5, 3B15, 3B20S and [[3B20D]] line, begun in 1982, was aimed at the former AT&T subsidiaries the [[RBOC]]s. Around 70,000 units were made before production ceased at the Oklahoma City Works (a former [[Western Electric]] factory) in 1993.<ref name="lastunits">{{cite news |last1=Denton |first1=Jon |date=December 16, 1993 |title=AT&T Makes Last 3B2 City-Produced Computer Stuff of Legends |publisher=The Oklahoman |url=https://www.oklahoman.com/story/news/1993/12/16/att-makes-last-3b2-city-produced-computer-stuff-of-legends/62439711007/}}</ref>

Starting with ATTIS in 1984, development of a commercial version of the 3B hardware commenced. The [[Motorola 68010]]-based [[UNIX PC]] (aka the 3B1) was released in 1985, developed externally by [[Convergent Technologies]]. This product was not a success, in part due to the high margin on the machines; AT&T sold the machine for $8,000 although their cost was approximately $4,000.{{cn|date=December 2022}}

The next product was the 3B2 product line, which ranged from a 3B2/200 [[Desktop computer|desktop]] unit, to a 3B2/1000 data center system. These machines were sold with [[SVR2|System V Release 2]], and later System V Release 3. The 3B2 was the reference platform for SVR3.