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VM

Operating system
VM 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. Wikipedia
Initial release: 1972; 52 years ago
Developer: IBM
Latest release: IBM z/VM V7.2 / September 16, 2020; 3 years ago
License: 1972–1981 Public domain, 1976–present Proprietary
OS family: VM family
Source model: 1972–1986 Open source, 1977–present Closed source

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