3B Computers
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3B is family of computer systems, produced by Western Electric/AT&T Computer Systems/Lucent Technologies.
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[edit] High Availability Computers
These includes: 3B20D, 3B20C, and 3B21D.
The 3B20D is a duplex (redundant) computer with a real-time operating system. It is used in the tele-communications environment and was first produced in the late 1970s at the WECo factory in Lisle Il. It ran using the Duplex Multi Environment Real Time (DMERT) operating system which was renamed UNIX-RTR (Real Time Reliable) in 1982. There were many improvements in both software andhardware throughout the 1980s. The computer was reengineered and renamed in 1992 as the 3B21D Computer.
[edit] General Purpose Computers
The family includes: 3B2, 3B5, 3B15, 3B20S, and 3B4000.
These computers were named after the successful 3B20D. The 3B20S (simplex) ran using the UNIX operating system was developed at Bell Labs and produced by WECo in 1982 for the general purpose internal Bell System use and later the mini-computer market. The other 3B computers were also created for this market and eventually were running UNIX System V from AT&T.
[edit] External links
[edit] See also
- 5ESS switch switching system
- WE32100 microcomputer
- DMERT operating system
- BSTJ Bell System Technical Journal, 62: 1. January 1983
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