Editing AT&T Computer Systems (section)

==Partners==
[[File:NCR model3000 class3434 computer.JPG|thumb|upright|NCR 3000 (Class 3434) external view (manufactured 1989)]]
[[File:NCR 3000-3434 internal.JPG|thumb|upright|NCR 3000 (Class 3434) 80486 internal view (manufactured 1989)]]
AT&T-CS also bought OEM systems from [[Tandem Computers]] and [[Pyramid Technology]]. The Tandem Integrity S2 was renamed the StarServer FT and sold only internally to other AT&T divisions. The Pyramid "System 7000" was a large symmetric multiprocessor, containing 12 CPUs, and saw its first large-scale application at the AT&T Universal Cards credit-card billing center, the first enterprise-scale replacement of mainframes by a UNIX server within AT&T.  Both these systems used the [[MIPS architecture|MIPS]] R-series [[RISC]] microprocessors.  After the WE 32000 microprocessors were canceled, the 3B2 follow-on (codenamed "Phoenix") was also to use a MIPS CPU.  The entire MIPS-based product line was to be renamed the System 9000, and to feature "scalavailability" - from normal commercial availability (NCA) choices, to fault-tolerant (FT), to high performance SMP.

The System 9000 strategy was canceled when AT&T's board of directors decided to close down AT&T-CS, and buy the [[NCR Corporation]], announced in 1991, and implemented January 1, 1992.  NCR management tried to cancel all further development of AT&T-CS systems, though some refused to allow this for a few years, and backlash from AT&T Network Systems (later to be spun off as [[Lucent Technologies]]) precipitated a purge of NCR upper management by the AT&T Board.  NCR had just developed and suddenly canceled its [[Motorola]] [[88000]]-based systems, and then started the NCR 3000 series, developed using Intel x86 [[microprocessor]]s.  The AT&T StarServer E could still beat the comparably equipped NCR 3450 by 11% in the [[Transaction Processing Performance Council|TPC]] Benchmark B test, and some of the SSE's 7 patented innovations were then adapted and retrofitted into the NCR 3000 design.

NCR was renamed AT&T Global Information Solutions (AT&T-GIS) in 1994, and some of the top NCR management was purged.  The Naperville, IL operation provided [[LifeKeeper]] Fault Resilient System software (a failover high-availability software cluster product), the [[Distributed lock manager]] for [[Oracle Corporation|Oracle]] Parallel Server, and the Vistium computer-telephony integrated (CTI) on-line hardware-assisted networked meeting product.  Only about 400 employees remained in the Naperville location by the beginning of 1995.  In the mid-1980s, there had been something like 30,000 employees associated with AT&T-CS, including marketing, customer support, factories, and development.

In 1994 a high powered team from AT&T Naperville transferred to NCR San Diego in the midst of developing a [[Micro Channel architecture]] based four channel SCSI adapter based on a custom [[Application-specific integrated circuit|ASIC]].  This host bus adapter went on to great success in NCR and served as a connection point for over a billion dollars worth of peripherals attached to NCR minicomputers and database servers. 

On September 20, 1995, Bob Allen, AT&T Chairman of the Board and CEO, announced the "trivestiture" - the 3-way split of AT&T into the new service-oriented AT&T, a newly independent NCR, and the new telecom equipment business which would later be named Lucent Technologies. On December 15, the former AT&T-CS operations were shut down, signaling the end of AT&T's involvement in designing computer systems. Three AT&T-CS employees went into the new NCR, 25 stayed with AT&T, and the rest (about 200) went to Lucent. Many former AT&T-CS employees have been employed by Schaumburg, IL-based Motorola.