OS/360 | Article about OS/360 by The Free Dictionary
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OS/360The operating system for the IBM System/360, introduced in 1964. OS/360 was later released in two versions: OS/MFT (Multiple Fixed Transactions) supported multiple programs that used fixed memory regions, and OS/MVT (Multiple Variable Transactions) supported varying program sizes. OS/MFT and OS/MVT were later enhanced for virtual storage and became OS/VS1 and OS/VS2. OS/VS2 evolved into MVS. See System/360 and MVS.