Multiple Virtual Storage, more commonly called MVS, was the most commonly used
operating system on the
System/370 and
System/390 IBM mainframe computers. It was developed by
IBM, but is unrelated to IBM's other mainframe operating system,
VM.First released in 1974, MVS had been renamed multiple times, first to
MVS/XA (eXtended Architecture), next to
MVS/ESA (Enterprise Systems Architecture), then to
OS/390 (when
UNIX System Services (USS) were added), and finally to
z/OS (when
64-bit support was added with the
zSeries models). Its core remains fundamentally the same operating system. By design, programs written for MVS can still run on z/OS without modification.
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