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1. operating system.

2. [obsolete, ITS], an output spy. See "OS and JEDGAR".

3. <operating system> An operating system from IBM for their System/360 line of hardware announced in 1964. OS was planned with several flavours that were supposed to be compatible. OS was late, memory hungry and not able to reach the marketing objectives of IBM for the 360/30, the planned successor of the IBM 1401. IBM then decided to design a new operating system for the low end machines which they called DOS/360.

[Jargon File]


Nearby terms: orthogonal « orthogonal instruction set « Orwell « OS » OS2 » OS/2 » OS/360

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