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Content derived from the Wikipedia article on Z/OS

Z/OS

From Wikipedia, the free encyclopedia

z/OS

The z/OS welcome screen as seen through a terminal emulator. This interface is still available, but a Web interface is used more commonly.

Website: IBM: z/OS operating system

Company/

developer: IBM

OS family: z/OS

Source model: Mostly closed source

Kernel type: Monolithic kernel

License: Proprietary monthly license charge (MLC)

Working state: Current

The correct title of this article is z/OS. The initial letter is shown capitalized due to technical restrictions.

z/OS is a 64-bit server operating system from IBM. It is the successor to the IBM mainframe operating system OS/390, combining MVS and UNIX System Services (a POSIX-compliant mainframe implementation of UNIX formerly known as MVS Open Edition, or OpenMVS).

While retaining much of the functionality originating in the 1970s and (in some cases) 1960s, z/OS also offers many of the same attributes and elements of currently-available open systems. So while CICS, IMS, RACF, SNA, and similar features are still available and in daily use, they are less prominent than in years past.

z/OS now also runs Java, supports UNIX (Single UNIX Specification) APIs and applications, and easily communicates with TCP/IP and the Web. A complementary IBM product, z/VM, improves Linux support on the same system. This support of current standard of functionality within z/OS and concurrent Linux support have allowed the operating system to garner continued use.

z/OS supports pre-z/Architecture mainframes using a 31-bit (ESA/390) mode, and earlier hardware using a 24-bit addressing model. However, starting with z/OS V1R6, introduced on September 24, 2004, z/OS requires a 64-bit zSeries or System z9 server. (IBM will support z/OS V1R5 until at least March 31, 2007.)

z/OS is IBM's flagship operating system, suited for continuous, high volume operation with high security and stability.

A lower-cost version of z/OS, z/OS.e, is identical in code, but runs with a startup setting that prevents execution of "classic" workloads such as most COBOL and PL/I. z/OS.e is available for IBM z800, z890, and z9 BC mainframes, and customers choose whether to run with this setting or not (and with the resulting license charges).

See also

Linux on zSeries

OS/360

Parallel Sysplex

z/TPF

z/VSE

External links

IBM: z/OS

IBM: Shop zSeries (ShopZ)

IBM: z/OS Internet Library

Retrieved from "http://en.wikipedia.org/wiki/Z/OS"

Categories: Wikipedia articles needing style editing | IBM Mainframe computer operating systems

End of Wikipedia content, http://en.wikipedia.org/wiki/Z/OS

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