General-purpose Computers
The general purpose family of 3B computer systems includes the 3B2, 3B5, 3B15, 3B20S, and 3B4000.
These computers were named after the successful 3B20D. The 3B20S (simplex) ran using the UNIX operating system and 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.
Read more about this topic: 3B Series Computers