<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> VM (often: VM / CMS) is a family of IBM virtual machine operating systems used on IBM mainframes System / 370, System / 390, zSeries, System z and compatible systems, including the Hercules emulator for personal computers . The first version, released in 1972, was VM / 370, or officially Virtual Machine Facility / 370 . This was a System / 370 reimplementation of earlier CP / CMS operating system . Milestone versions included VM / SP . The current version, z / VM, is still widely used as one of the main full virtualization solutions for the mainframe market . </P> <P> The heart of the VM architecture is a control program or hypervisor called VM - CP (usually: CP; sometimes, ambiguously: VM). It runs on the physical hardware, and creates the virtual machine environment . VM - CP provides full virtualization of the physical machine--including all I / O and other privileged operations . It performs the system's resource - sharing, including device management, dispatching, virtual storage management, and other traditional operating system tasks . Each VM user is provided with a separate virtual machine having its own address space, virtual devices, etc., and which is capable of running any software that could be run on a stand - alone machine . A given VM mainframe typically runs hundreds or thousands of virtual machine instances . VM - CP began life as CP - 370, a reimplementation of CP - 67, itself a reimplementation of CP - 40 . </P>

What is the name of virtual machine that the mainframe called had