MVT

From Wikipedia, the free encyclopedia

It has been suggested that this article or section be merged into OS/360 and successors. (Discuss)

History of IBM mainframe operating systems

IBSYS 1950s CTSS 1961 BOS/360 1965 TOS/360 1965 TSS/360 1967 MUSIC/SP 1960s MTS 1970s

DOS/360 and successors 1966 DOS/VS 1972 DOS/VSE 1980s VSE/ESA 1991 z/VSE 2005

OS/360 and successors 1966 MFT 1966 OS/VS1 1970s MVT 1967 OS/VS2R1 (SVS) 1972 MVS (OS/VS2R2) 1974 MVS/370 1970s MVS/XA 1980s MVS/ESA 1988 OS/390 1995 z/OS 2000

VM line CP-40/CMS 1967 CP-67/CMS 1967 VP/CSS 1968 VM/370 1972 VM/SP 1980 VM/ESA 1988 z/VM 2000

TPF line ACP 1967 TPF 1979 z/TPF 2000s

Unix-like on IBM mainframes UTS 1981 AIX/370 1990 AIX/ESA 1991 Linux 1999

This box: view • talk • edit

Multiprogramming with a Variable number of Tasks (MVT) was the most sophisticated of three available configurations of the OS/360's control program.^[1] In turn, OS/360 was an operating system for the IBM System/360 line of computers. MVT was intended for the largest machines in the System/360 family, introduced in 1964, but it did not become available until 1967. Early versions had many problems and the simpler MFT continued to be used for many years.

In later decades, MVT had been developed into MVS, then OS/390, and now z/OS.

Although officially PCP, MFT and MVT were not a separate operating systems from OS/360,^[1] those were only an install-time configuration options—in today's words, a three different variants of OS kernel—because of quite different behaviour and memory requirements, users commonly considered them de facto separate operating systems, and referred to them as early OS/360, OS/MFT, OS/MVT, respectively.

[edit] References