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Operating System
An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers. The dominant desktop operating system is Microsoft Windows with a market share of around 82.74%
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MVS
Multiple Virtual Storage, more commonly called MVS, was the most commonly used operating system on the System/370 and System/390 IBM mainframe computers. It was developed by IBM, but is unrelated to IBM's other mainframe operating systems, e.g., VSE, VM, TPF. First released in 1974, MVS was extended by program products with new names multiple times:
  • next to MVS/SP (MVS/System Product) Version 1,
  • next to MVS/XA (MVS/eXtended Architecture),
  • next to MVS/ESA (MVS/Enterprise Systems Architecture),
  • then to OS/390 and
  • finally to z/OS (when 64-bit support was added with the zSeries models). IBM added UNIX support (originally called OpenEdition MVS) in MVS/SP V4.3 and has obtained POSIX and UNIX™ certifications at several different levels from IEEE, X/Open and The Open Group. The MVS core remains fundamentally the same operating system
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  • OS/VS1
    Operating System/Virtual Storage 1, or OS/VS1, is a discontinued IBM mainframe computer operating system designed to be run on IBM System/370 hardware. It was the successor to the Multiprogramming with a Fixed number of Tasks (MFT) option of System/360's operating system OS/360
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    IBM 8100
    The IBM 8100 Information System, announced Oct. 3, 1978, was at one time IBM’s principal distributed processing engine, providing local processing capability under two incompatible operating systems (DPPX and DPCX) and was follow-on to IBM 3790. The 8100, when used with the Distributed Programming Processing Executive (DPPX), was intended to provide turnkey distributed processing capabilities in a centrally controlled and managed network. It never saw much success—one anonymous source, according to PC Magazine, called it a "boat anchor"—and became moribund when host-based networks went out of fashion. This, coupled with IBM's recognition that they had too many hardware and software systems with similar processing power and function, led to announcement in March 1986 that the 8100 line would not be expanded and a new System/370 compatible processor line, ES/9370, would be provided to replace it
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    VSE (operating System)
    z/VSE (Virtual Storage Extended) is an operating system for IBM mainframe computers, the latest one in the DOS/360 lineage, which originated in 1965. It is less common than prominent z/OS and is mostly used on smaller machines
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    IBM 4680 OS
    FlexOS is a discontinued modular real-time multi-user multi-tasking operating system (RTOS) designed for computer-integrated manufacturing, laboratory, retail and financial markets
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    History Of CP/CMS
    This article covers the History of CP/CMS — the historical context in which this important IBM time-sharing virtual machine operating system was built. It provides details to support the main CP/CMS and History of IBM articles, drawing on source material that is not readily available on-line. CP/CMS development occurred in a complex political and technical milieu. To understand the system's history, it is necessary to examine these broader forces. The following material summarizes major issues and events of the day from the perspective of CP/CMS development – a perspective that is somewhat different from (and orthogonal to) other ways of viewing the period
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    IBM
    IBM (International Business Machines Corporation) is an American multinational technology company headquartered in Armonk, New York, United States, with operations in over 170 countries. The company originated in 1911 as the Computing-Tabulating-Recording Company (CTR) and was renamed "International Business Machines" in 1924. IBM manufactures and markets computer hardware, middleware and software, and provides hosting and consulting services in areas ranging from mainframe computers to nanotechnology. IBM is also a major research organization, holding the record for most U.S. patents generated by a business (as of 2018) for 25 consecutive years. Inventions by IBM include the automated teller machine (ATM), the PC, the floppy disk, the hard disk drive, the magnetic stripe card, the relational database, the SQL programming language, the UPC barcode, and dynamic random-access memory (DRAM)
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    IBM 3790
    The IBM 3790 Communications System, developed by IBM's Data Processing Division (DPD), was announced in 1975. It was one of the first distributed computing platforms
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