VSE
Operating system
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VSEⁿ is an operating system for IBM mainframe computers, the latest one in the DOS/360 lineage, which originated in 1965. It is less common than z/OS and is mostly used on smaller machines. Wikipedia
Latest release: 6.3 / May 17, 2022; 22 months ago
OS family: DOS/360 and successors
Source model: Closed source