* 310: 959-1122 San Pedro / Wilmington, CA ( AT & T )

* 478: 990 Dublin, GA. ( BELLSOUTH & AT & T )

* 682: 959-1122 Ft. Worth, TX ( AT & T / SBC )

* 682: 970-1234 Ft. Worth, TX ( AT & T / SBC )

* 760: 959-1122 Oceanside / Escondido / Fallbrook, CA ( Current for all AT & T / PB switches )

* 817: 970-1234 Ft. Worth, TX ( AT & T / SBC )

* 817: 959-1122 Ft. Worth, TX ( AT & T / SBC )

* 912: 940 Vidalia, GA. ( BELLSOUTH & AT & T )

* 972: 959-1122 Plano, TX ( AT & T / SBC )

* 972: 970-1234 Plano, TX ( AT & T / SBC )

* 270: 559 AT & T, Fishskill NY.

AIX / 370 was IBM's third attempt to offer Unix-like functionality for their mainframe line, specifically the System / 370 ( the prior versions were a TSS / 370 based Unix system developed jointly with AT & T c. 1980, and VM / IX a VM / 370 based system developed jointly with Interactive Systems Corporation c. 1984 ).

# REDIRECT AT & T

As of February 18, 2008, carriers in the United States were no longer required to support AMPS and companies such as AT & T and Verizon have discontinued this service permanently.

D-AMPS was a digital, 2G standard used mainly by AT & T Mobility and U. S. Cellular in the United States, Rogers Wireless in Canada, Telcel in Mexico, Telecom Italia Mobile ( TIM ) in Brazil, VimpelCom in Russia, Movilnet in Venezuela, and Cellcom in Israel.

* AT & T Mobility-In areas where AT & T Mobility previously had D-AMPS operating on 1900 MHz frequencies, no analog AMPS network existed, and the D-AMPS network on the 1900 MHz frequency was shut down in mid-2007.

# REDIRECT AT & T Corporation

However, FuturePhone ( as well as other similar services ) ceased operations upon legal challenges from AT & T and other service providers.

In the early 1960s, AT & T introduced digital telephony first on long-distance trunk lines.

* Michigan Bell, the subsidiary of AT & T serving the state of Michigan

* Regional Bell Operating Company, any of the phone companies spun-off from AT & T in 1984

* Bell Labs, a research & development organization founded by AT & T

Initially designed to run on AT & T Hobbit-based hardware, BeOS was later modified to run on PowerPC-based processors: first Be's own systems, later Apple Inc .' s PowerPC Reference Platform and Common Hardware Reference Platform, with the hope that Apple would purchase or license BeOS as a replacement for its then aging Mac OS.

Other 386 PCs followed suit, and the AT ( later ISA ) bus remained a part of most systems even into the late 1990s.

The 8-bit bus ran at 4. 77 MHz ( the clock speed of the IBM PC and IBM PC / XT's 8088 CPU ), while the 16-bit bus operated at 6 or 8 MHz ( because the 80286 CPUs in IBM PC / AT computers ran at 6 MHz in early models and 8 MHz in later models.

It was also available on some non-IBM compatible machines such as Motorola 68k-based Apollo ( 68020 ) and Amiga 3000 ( 68030 ) workstations, the short-lived AT & T Hobbit and later PowerPC based BeBox.

The later E-stepping level of the 80286 was free of the several significant errata that caused problems for programmers and operating system writers in the earlier B-step and C-step CPUs ( common in the AT and AT clones ).

All major graphics standards were supported ; initially CGA and Hercules, and later EGA, AT & T, and VGA.

This suit later leads to the breakup of AT & T and its Bell System.

In 1917, Gilbert Vernam ( of AT & T ) invented and later patented in 1919 () a cipher based on teleprinter technology.

AT & T later offered Heaviside money in exchange for his rights ; it is possible that the Bell engineers ' respect for Heaviside influenced this offer.

AT & T Park ( originally Pacific Bell Park and later SBC Park ) sits on the shores of China Basin ( often referred to as McCovey Cove by Giants fans ) at the corner of 3rd and King Streets ( with an official address of 24 Willie Mays Plaza to honor the long-time Giant ).

Utilizing the early work at Bell Labs, AT & T eventually established their Frequency Control Products division, later spun off and known today as Vectron International.

The EDFA was first demonstrated several years later by a group including David N. Payne, R. Mears, and L. Reekie, from the University of Southampton and a group from AT & T Bell Laboratories, E. Desurvire, P. Becker, and J. Simpson.

The IBM AT compatible bus was later named the Industry Standard Architecture bus by manufacturers of compatible computers.

NFS and ONC figured prominently in the network-computing war between Sun Microsystems and Apollo Computer, and later the UNIX wars ( ca 1987-1996 ) between AT & T and Sun on one side, and Digital Equipment, HP, and IBM on the other.

Before NBC's 1926 formation, RCA had acquired AT & T's New York City station WEAF ( later WNBC, now CBS-owned WFAN ).

Although this system was never released, Commodore's negotiations with AT & T over the proper way to bundle their VCOS / VCAS operating system software in a personal computer environment helped Apple Computer deliver their AV-series Macintosh systems, two years later.

In early 1971, a former Air Force electronics technician named John Draper ( later self-nicknamed Captain Crunch, Crunch, Crunchman, or Mr. Crunchtastic ) was informed by his phone phreak friend Joe Engressia that a toy whistle that was, at the time, packaged in boxes of the cereal could be easily modified to emit a tone at precisely 2600 Hertz, the same frequency that was used by AT & T long lines to indicate that a trunk line was ready to route a new call.

The later allowed the programmers to create a commonly used graphical element, the AT & T logo for instance, and save it to a macro.

The Regional Bell Operating Companies ( RBOC ) are the result of United States v. AT & T, the U. S. Department of Justice antitrust suit against the former American Telephone & Telegraph Company ( later known as AT & T Corp .).

The IBM AT bus, which later became known as the Industry Standard Architecture ( ISA ) bus had a number of technical design limitations, including:

It introduced the technically superior Micro Channel architecture bus for higher speed communication within the system, but failed to maintain the open AT bus ( later called the ISA bus ), which meant that none of the millions of existing add-in cards would function.