Editing 3B series computers (section)

===3B20S===
The 3B20S (simplex) was developed at [[Bell Labs]] and produced by Western Electric in 1982 for general purpose internal [[Bell System]] use. The 3B20S<ref name=3Bseries.NYT840328/> has hardware similar to the 3B20D, but one unit instead of two. The machine is approximately the size of a large [[refrigerator]], requiring a minimum of 170 square feet floor space.<ref>[http://bitsavers.trailing-edge.com/pdf/westernElectric/3b20s/234-301-910WE_3B20S_System_Index_and_Description_Jul81.pdf 3B20S Processor System Index and Description], Western Electric Co., July 1981.</ref> It was in use at the [[1984 Summer Olympics]], where around twelve 3B20S served the [[email]] requirements of the ''Electronic Messaging System'', which was built to replace the man-based messaging system of earlier Olympiads. The system connected around 1800 user terminals and 200 printers.<ref>{{cite journal
  |url=https://ieeexplore.ieee.org/document/1654251
  |title=Olympics electronic messaging system demonstrated
  |journal=[[IEEE Computer]] |volume=16 |issue=11 |date=November 1983  |page=113|doi = 10.1109/MC.1983.1654251|s2cid = 47105018|url-access=subscription}}</ref> The '''3B20A''' is an enhanced version of the 3B20S, adding in a second processing unit working in parallel as a multiprocessor unit.