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2 definitions found
 for OS/MFT
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

         Operating System / Multiprogramming with a Fixed number of Tasks
  (OS, IBM S/360), "OS/MFT"

From The Free On-line Dictionary of Computing (30 December 2018) :

  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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