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MVT is an acronym for Multiprogramming with a Variable number of Tasks. It is a very old forerunner of the IBM operating systems MVS and z/OS.

Long since dead and buried, it is of historical interest as the most advanced of the early OS/360 operating systems and the one most influential in later developments.

In particular, the I/O queueing of all the OS/360 family left a lot to be desired. This was addressed by a 3rd party package, HASP, the Houston Automated Spooling Package. In MVS, HASP became JES, the Job Entry Subsystem (either JES2 or JES3), and it was many years before the HASP labels were removed from the JES source.

See Also: OS/360