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Z/OS - Wikipedia, the free encyclopedia

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 and a Web interface is commonly used.
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, DB2, 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 communicates with TCP/IP and the Web. A complementary IBM product, z/VM, assists the management of Linux guests on the same physical mainframe. These new functions within z/OS and z/VM, and the "multiple Linux image" support have encouraged new applications to appear on the z/OS operating system.

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).

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aa - ab - af - ak - als - am - an - ang - ar - arc - as - ast - av - ay - az - ba - bar - bat_smg - bcl - be - be_x_old - bg - bh - bi - bm - bn - bo - bpy - br - bs - bug - bxr - ca - cbk_zam - cdo - ce - ceb - ch - cho - chr - chy - co - cr - crh - cs - csb - cu - cv - cy - da - de - diq - dsb - dv - dz - ee - el - eml - eo - es - et - eu - ext - fa - ff - fi - fiu_vro - fj - fo - fr - frp - fur - fy - ga - gan - gd - gl - glk - gn - got - gu - gv - ha - hak - haw - he - hi - hif - ho - hr - hsb - ht - hu - hy - hz - ia - id - ie - ig - ii - ik - ilo - io - is - it - iu - ja - jbo - jv - ka - kaa - kab - kg - ki - kj - kk - kl - km - kn - ko - kr - ks - ksh - ku - kv - kw - ky - la - lad - lb - lbe - lg - li - lij - lmo - ln - lo - lt - lv - map_bms - mdf - mg - mh - mi - mk - ml - mn - mo - mr - mt - mus - my - myv - mzn - na - nah - nap - nds - nds_nl - ne - new - ng - nl - nn - no - nov - nrm - nv - ny - oc - om - or - os - pa - pag - pam - pap - pdc - pi - pih - pl - pms - ps - pt - qu - quality - rm - rmy - rn - ro - roa_rup - roa_tara - ru - rw - sa - sah - sc - scn - sco - sd - se - sg - sh - si - simple - sk - sl - sm - sn - so - sr - srn - ss - st - stq - su - sv - sw - szl - ta - te - tet - tg - th - ti - tk - tl - tlh - tn - to - tpi - tr - ts - tt - tum - tw - ty - udm - ug - uk - ur - uz - ve - vec - vi - vls - vo - wa - war - wo - wuu - xal - xh - yi - yo - za - zea - zh - zh_classical - zh_min_nan - zh_yue - zu

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