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system/360

system/360 in Technology
computer
The generic name for the CPUs and architecture released by IBM on 1964-04-07. The 360 was marketed as a general purpose computer with 'all round' functionality - hence 360 (degrees).
Models ranged from the 360/20 to the 360/65 and later the 360/95, with typical memory configurations from 16K to 1024K.
Elements of the architecture, such as the basic instruction set are still in use on IBM mainframes today. Operating System/360 (OS/360) was developed for System/360. Other associated operating systems included DOS, OS/MFT and OS/MVT.
The 360 architecture was based on an 8-bit byte, 16 general purpose registers, 24-bit addressing, and a PSW (Program Status Word) including a location counter.
Gene Amdahl, then an IBM employee, is generally acknowledged as the 360's chief architect. He later went on to found Amdahl Corporaton, a manufacture of PCM mainframe equipment.
The 360's predecessors were the smaller IBM 1401 and the large IBM 7090 series. If was followed by the IBM 370.
See also ABEND, ALC, BAL, Big Red Switch, HCF, mode bit, PL360, PL/S.
(2004-06-06)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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