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The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.
this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997. was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled. 2009: overlaid by 442. 761.
The new numbering plan provided for 152 area codes, each with a capacity to serve as many as 540 central offices. [26] Originally, only eighty-six area codes were assigned. New Jersey received the first NPA code in the new system, area code 201. [27] The second area code, 202, was assigned to the District of Columbia. The allocation of area ...
Copland is an operating system developed by Apple for Macintosh computers between 1994 and 1996 but never commercially released. It was intended to be released with the name System 8, and later after changing their naming style, Mac OS 8. [ 1] Planned as a modern successor to the aging System 7, Copland introduced protected memory, preemptive ...
The current Mac operating system is macOS, originally named Mac OS X until 2012 and then OS X until 2016. [ 3 ] It was developed between 1997 and 2001 after Apple's purchase of NeXT. It brought an entirely new architecture based on NeXTSTEP, a Unix system, that eliminated many of the technical challenges that the classic Mac OS faced, such as ...
Mac OS X Public Beta – code name Kodiak. Mac OS X 10.0 – code name Cheetah. Mac OS X 10.1 – code name Puma. Mac OS X 10.2 – also marketed as Jaguar. Mac OS X Panther – 10.3. Mac OS X Tiger – 10.4. Mac OS X Leopard – 10.5. Mac OS X Snow Leopard – 10.6. Mac OS X Lion – 10.7 – also marketed as OS X Lion.
The original numbering plan area (NPA) was split twice: in 1957 to create area code 819 and in 1998 to create area code 450. In 2006, the entire remaining 514 area was assigned a second area code, 438, in an overlay plan that made ten-digit dialing mandatory in the Montreal area. Area code 263 was added to the overlay in October 2022.
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.