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Operating System/Multiprogramming of Fixed Tasks

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(operating system)Operating System/Multiprogramming of Fixed Tasks - (OS/MFT) One of the IBM operating systems associated with the IBM 360, released in 1966 and targetted at mid-range IBM 360 users (typically 360/40, 360/50). OS/MFT was the juinior member of the main 'OS' series of IBM operating systems, the other being OS/MVT. Smaller 360 mainframes used DOS.

OS/MFT shared JCL and utilities with OS/MVT but allocated memory differently. In OS/MFT, partitions of memory were of a fixed number and size, specified by the generation and configuration of the operating system. As this class of mainframe had typically less than 512K of main memory, partitions tended to be about 128K.

With the advent of Virtual Storage and the System 370's Dynamic Address Translation (DAT), OS/MFT was improved to become OS/VS1, taking account of virtual storage in a single partition up to 16MB.
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