Virtual Machine

(VM) An {IBM} pseudo-{operating system}

{hypervisor} running on {IBM 370}, {ESA} and {IBM 390}

architecture computers.

VM comprises CP ({Control Program}) and CMS ({Conversational

Monitor System}) providing Hypervisor and personal computing

environments respectively. VM became most used in the early

1980s as a Hypervisor for multiple {DOS/VS} and {DOS/VSE}

systems and as IBM's internal operating system of choice. It

declined rapidly following widespread adoption of the {IBM PC}

and hardware partitioning in {microcode} on IBM {mainframes}

after the {IBM 3090}.

VM has been known as VM/SP (System Product, the successor to

{CP/67}), VM/XA, and currently as VM/ESA (Enterprise Systems

Architecture). VM/ESA is still in used in 1999, featuring a

{web} interface, {Java}, and {DB2}. It is still a major IBM

operating system.

{Home (http://vmdev.gpl.ibm.com/)}.

["History of VM"(?), Melinda Varian, Princeton University].

(1999-10-31)