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AT&T Inc. (with "AT&T" being an abbreviation for its former name, the American Telephone and Telegraph Company) is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. [5] It is the world's fourth-largest telecommunications company by revenue and the largest wireless carrier in ...
History of AT&T. The history of AT&T dates back to the invention of the telephone. The Bell Telephone Company was established in 1877 by Alexander Graham Bell, who obtained the first US patent for the telephone, and his father-in-law, Gardiner Greene Hubbard. Bell and Hubbard also established American Telephone and Telegraph Company in 1885 ...
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 R-series RISC microprocessors. After the WE ...
AT&T Communications. AT&T Corporation, commonly referred to as AT&T, an abbreviation for its former name, the American Telephone and Telegraph Company, was an American telecommunications company that provided voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies.
AT&T Mobility. AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the largest wireless carrier in the United States, with 241.5 million subscribers as of December ...
The Monochrome Display Adapter ( MDA, also MDA card, Monochrome Display and Printer Adapter, MDPA) is IBM 's standard video display card and computer display standard for the IBM PC introduced in 1981. The MDA does not have any pixel-addressable graphics modes, only a single monochrome text mode which can display 80 columns by 25 lines of high ...
Background. Since the Kingsbury Commitment in 1913, AT&T was permitted by the United States government, first via the Interstate Commerce Commission and then via the Federal Communications Commission (FCC), to become the natural monopoly telephone service provider in the country (known as the Bell System) in return for commitments to universal service and basic connectivity for all consumers.
Connectivity. RS-232 port, Parallel port, 3 phone jacks. Mass. 40 lb (18 kg) The AT&T UNIX PC is a Unix desktop computer originally developed by Convergent Technologies [2] (later acquired by Unisys ), [5] [1] and marketed by AT&T Information Systems in the mid- to late-1980s. The system was codenamed "Safari 4" [6] and is also known as the PC ...
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