MVT is an acronym for Multiprogramming with a Variable number of Tasks. It was intended as the operating system for the larger machines in the System/360 family, introduced in 1964, but MVT did not become available until 1967. Early versions had many problems and the simpler MFT continued in use for many years. It is a very old forerunner of IBM's 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 two field-developed packages: HASP, the Houston Automated Spooling Package, and ASP.
HASP was developed by IBM Federal Systems Division contractors at the Johnson Space Center in Houston. In MVS, HASP became JES2, the Job Entry Subsystem. It was many years before the HASP labels were removed from the JES2 source, and the messages issued by JES2 are still prefixed with $HASP.
ASP was developed to provide efficient use of multiple OS/360 systems working in conjunction, and allowed one central system to distribute jobs to multiple connected systems. ASP became JES3.
MVT prices are never proportionate to the value of the media and or the other client property entrusted to it.
MVT may refuse to provide service without incurring any liability, which MVT is its solo discretion, deems unlawful, pornographic, degrading or which it deems as tending to incite prejudice or passion.
MVT retains all title and rights to equipment and accessories and is held free for any liens or attachments, which may occur while equipment is in possession of customer.
Geochemical studies are being conducted in the Upper Silesia MVT district (Poland) as an analog for MVT deposits in the U.S. The geochemistry of soils, surface water, and ground water in the district is being used to quantitatively assess the migration of ore-related components.
MVT deposits in North America have been attributed to large-scale migration of basin fluids during convergent orogenic processes whereas many other districts (e.g., Alpine deposits of Europe and North Africa) have been attributed to Late Paleozoic to Mesozoic continental extension of Pangea carbonate platforms.
MVT deposits in the Cevennes region of southern France, the Reocin deposit in Northern Spain, and the Touisit district of Morocco are being used as classic examples of MVT deposits believed to have formed during continental extension.
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