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z/OS Last modified: Friday, December 01, 2006

Often abbreviated as ZOS, z/OS is IBM's mainframe operating system. It is a 64-bit operating system that supports Java, UNIX, API's, and TCP/IP to name a few features.  z/OS.e is a specially priced, slimmed-down offering of z/OS. It provides select functions but  uses the same code base as z/OS and invokes an operating environment that is comparable to z/OS in service, management, reporting, and reliability. The first name for IBM's mainframe operating system was MVS (Multiple Virtual Storage), which was succeeded first by OS/390 and then z/OS. See also MVS.

IBM z/OS IBM's Web page for z/OS, its flagship mainframe operating system. z/OS and z/OS.e An IBM Web page comparing and contrasting its z/OS and z/OS.e operating systems.