High Quality Content by WIKIPEDIA articles! z/OS is a 64-bit operating system for mainframe computers, created by IBM. It is the successor to OS/390, which in turn followed MVS and combined a number of formerly separate, related products. z/OS offers the attributes of modern operating systems but also retains much of the functionality originating in the 1960s and each subsequent decade that is still found in daily use. (Extreme backward compatibility is one of z/OS's central design philosophies.) It is derived from OS/390 and was introduced in October, 2000. z/OS supports staple mainframe technologies such as CICS, IMS, DB2, RACF, SNA, WebSphere MQ, record-oriented data access methods, REXX, CLIST, SMP/E, JCL, TSO/E, and ISPF. However, z/OS also supports 64-bit Java, C/C++, and UNIX (Single UNIX Specification) APIs and applications — The Open Group certifies z/OS as a compliant UNIX operating system — with UNIX/Linux-style hierarchical HFS (not to be confused with the Macintosh HFS) and zFS file systems.

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