![]() By design, programs written for MVS run on z/OS without modification.Īt first IBM described MVS as simply a new release of OS/VS2, but it is, in fact a major rewrite. The MVS core remains fundamentally the same operating system. IBM added UNIX support (originally called OpenEdition MVS) in MVS/SP V4.3 and has obtained POSIX and UNIX™ certifications at several different levels from IEEE, X/Open and The Open Group. ![]()
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