AT&T Computer Systems
AT&T Computer Systems is the generic name for American Telephone & Telegraph's unsuccessful attempt to compete in the computer business. In return for divesting the local Bell Operating Companies (Baby Bells), AT&T was allowed to have an unregulated division to sell computer hardware and software.
Prior to the divestiture of the Bell System on January 1, 1984, the Bell Labs Processor Division had developed the 3B20D ("D" for Duplex); the commercial simplex version 3B20S, which competed with the DEC VAX for internal Bell System usage; the world's first 32-bit microprocessor, the BELLMAC 32A; and, using this microprocessor, the 3B5 and 3B15 computers for billing and telecom switching control applications.
Read more about AT&T Computer Systems: Divestiture, Desktops, Servers, Partners
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