| Virtual Machine (VM) An pseudo- running on , and architecture computers. VM comprises CP () and CMS () providing Hypervisor and personal computing environments respectively. VM became most used in the early 1980s as a Hypervisor for multiple and systems and as IBM's internal operating system of choice. It declined rapidly following widespread adoption of the and hardware partitioning in on IBM after the . VM has been known as VM/SP (System Product, the successor to ), VM/XA, and currently as VM/ESA (Enterprise Systems Architecture). VM/ESA is still in used in 1999, featuring a interface, , and . It is still a major IBM operating system. {Home (http://vmdev.gpl.ibm.com/)}. ["History of VM"(?), Melinda Varian, Princeton University]. (1999-10-31) |
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