OS/390


OS/390

(operating system)An IBM mainframe operating system,featuring integrated MVS, UNIX, LAN, distributed computing and application enablement services through itsbase elements. These base services enable open, distributedprocessing and offer a foundation for object-ready applicationdevelopment. The OS/390 base includes a Communication Server that includes VTAM, the VTAM AnyNet feature,TCP/IP and TIOC. It provides SNA (3270), APPC,High Performance Routing, ATM support, sockets andRPC.

OS/390 is basically rebranded, repackaged MVS/OE, CMOSprocessors, RAMAC disk arrays and open systems extensionto networking in VTAM, the principle being that if you can'tcompete, rebrand what you have and tell everyone it'ssomething new.

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OS/390

The primary operating system used in IBM mainframes. OS/390 was originally the MVS/ESA operating system renamed and repackaged in 1996 with an extensive set of utilities. Although the name MVS was still used to refer to the base control program of OS/390, enhancements in usability and workload balancing made OS/390 stand apart from its MVS heritage. OS/390 is upward compatible from MVS/ESA 5.2.2, but downward compatibility is not ensured. See System/390.