VM (operating system)

Family of IBM virtual machine operating systems

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From Wikipedia

VM, often written VM/CMS, is a family of virtual machine operating systems used on IBM mainframes including the System/370, System/390, IBM Z and compatible systems. It replaced the older CP-67 that formed the basis of the CP/CMS operating system. It was first released as the free Virtual Machine Facility/370 for the S/370 in 1972, followed by chargeable upgrades and versions that added support for new hardware. VM creates virtual machines into which a conventional operating system may be loaded to allow user programs to run. Originally, that operating system was CMS, a simple single-user system similar to DOS. VM can also be used with a number of other IBM operating systems, including large systems like MVS or VSE, which are often run on their own without VM. In other cases, VM is used with a more specialized operating system or even programs that provided many OS features. These include RSCS and MUMPS, among others.

Text: Wikipédia, CC BY-SA 4.0. · Image: WEC3390 (CC BY-SA 4.0) ·

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