Multiprogramming with a Variable number of Tasks (MVT) was the most sophisticated of three available configurations of the OS/360's control program. The history of operating systems running on IBM mainframes is a notable chapter of history of mainframe operating systems, because of IBM 's long-standing position IBSYS was the tape based Operating system that IBM supplied with its IBM 7090 and This article is about the MIT Computation Center operating system BOS/360 (Basic Operating System/360 was an early IBM Operating system. TOS/360 (Tape Operating System/360 was an IBM Operating system for the System/360, used in the early days around 1965 to support the IBM The IBM Time Sharing System TSS/360 was an early Time-sharing Operating system which ran on a special model of the System/360 line of mainframes the MUSIC/SP (Multi-User System for Interactive Computing / System Product originally "McGill University System for Interactive Computing" was developed at McGill University Michigan Terminal System ( MTS) is an Operating system for the IBM System/360 and its successors that was developed jointly by the following institutions Disk Operating System/360, also DOS/360, or simply DOS, was an Operating system for IBM mainframes It was announced by IBM on the z/VSE (Virtual Storage Extended is an Operating system for IBM mainframe computers the latest one in the DOS/360 lineage, which originated in 1965 See also History of IBM mainframe operating systems OS/360, officially known as IBM System/360 Operating System, was a group of Batch processing In the History of IBM mainframe operating systems, multiprogramming with a fixed number of tasks ( MFT) was one of the three available configurations of the OS/360 Operating System/Virtual Storage 1, or OS/VS1,was an IBM mainframe computer Operating system designed to be run on IBM System/370 Multiple Virtual Storage, more commonly called MVS, was the most commonly used Operating system on the System/370 and System/390 IBM MVS/370 is the earliest currently supported version of the MVS Operating system. MVS/XA, or Multiple Virtual Storage/Extended Architecture, was a version of the IBM operating system that is now called Z/OS. MVS/ESA MVS Enterprise System Architecture Version of MVS, first introduced as MVS/SP Version 3 in February 1988 OS/390 is an IBM Operating system for the System/390 IBM mainframe computers. z/OS is a 64-bit Operating system for Mainframe computers, created by IBM. See also CP/CMS, History of IBM This lengthy article explores the History of CP/CMS — the historical context in which this important IBM Time-sharing CP-40 was a research precursor to CP-67, which in turn was part of IBM's then-revolutionary CP[-67]/CMS &ndash a Virtual machine / Virtual memory CP/CMS was a Time-sharing Operating system of the late 60s and early 70s known for its excellent performance and advanced features See also CP/CMS CP-67 was the control program portion of CP/CMS, a Virtual machine operating system developed for the IBM System/360-67 CP/CMS was a Time-sharing Operating system of the late 60s and early 70s known for its excellent performance and advanced features See also National CSS CP/CMS|History of CP/CMS|IBM System/360-67 VP/CSS was a Time-sharing Operating system developed by National CSS. CP/CMS|History of CP/CMS VM (often VM/CMS) refers to a family of IBM Virtual machine Operating systems used on IBM System/370 CP/CMS|History of CP/CMS VM (often VM/CMS) refers to a family of IBM Virtual machine Operating systems used on IBM System/370 CP/CMS|History of CP/CMS VM (often VM/CMS) refers to a family of IBM Virtual machine Operating systems used on IBM System/370 See also VM (operating system z/VM is the current version in IBM's VM family of Virtual machine Operating systems. IBM Airline Control Program, or ACP, was the Operating system developed by IBM beginning about 1965. TPF is an IBM Real-time operating system for mainframes descended from the IBM System/360 family including ZSeries and System TPF is an IBM Real-time operating system for mainframes descended from the IBM System/360 family including ZSeries and System A Unix-like (sometimes shortened to *nix) Operating system is one that behaves in a manner similar to a Unix system while not necessarily conforming UTS is an implementation of the UNIX Operating system for IBM mainframe (and compatible computers Linux on System z is the collective term for the Linux operating system compiled to run on IBM mainframes especially System z machines See also History of IBM mainframe operating systems OS/360, officially known as IBM System/360 Operating System, was a group of Batch processing ^[1] In turn, OS/360 was an operating system for the IBM System/360 line of computers. An operating system (commonly abbreviated OS and O/S) is the software component of a Computer system that is responsible for the management and coordination The IBM System/360 ( S/360) is a Mainframe computer system family announced by IBM on April 7, 1964. MVT was intended for the largest machines in the System/360 family, introduced in 1964, but it did not become available until 1967. Year 1964 ( MCMLXIV) was a Leap year starting on Wednesday (link will display full calendar of the 1964 Gregorian calendar. Year 1967 ( MCMLXVII) was a Common year starting on Sunday (link will display full calendar of the 1967 Gregorian calendar. Early versions had many problems and the simpler MFT continued to be used for many years. In the History of IBM mainframe operating systems, multiprogramming with a fixed number of tasks ( MFT) was one of the three available configurations of the OS/360

In later decades, MVT had been developed into MVS, then OS/390, and now z/OS. Multiple Virtual Storage, more commonly called MVS, was the most commonly used Operating system on the System/370 and System/390 IBM OS/390 is an IBM Operating system for the System/390 IBM mainframe computers. z/OS is a 64-bit Operating system for Mainframe computers, created by IBM.

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.

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