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The earliest electronic digital systems had no operating systems.
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Many major features were pioneered in the field of operating systems, including batch processing, input/output interrupt, buffering, multitasking, spooling, runtime libraries, link-loading, and programs for sorting records in files
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monitor programs that could automatically run different application programs in succession to speed up processing
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SHARE Operating System was released as an integrated utility for the IBM 704, and later in the 709 and 7090 mainframes, although it was quickly supplanted by IBSYS/IBJOB on the 709, 7090 and 7094.
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Control Data Corporation developed the SCOPE operating system in the 1960s, for batch processing.
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Introduced the B5000 in 1961 with the MCP, (Master Control Program) operating system.
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Control Data and the University of Illinois developed the PLATO operating system, which used plasma panel displays and long-distance time sharing networks. Plato was remarkably innovative for its time, featuring real-time chat, and multi-user graphical games. Burroughs Corporation introduced the B5000 in 1961 with the MCP, (Master Control Program) operating system
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Several hardware capabilities evolved that allowed similar or ported software to run on more than one system.
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University of California, Berkeley installed its first Unix system.
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After programmable general purpose computers were invented, machine languages were introduced that speed up the programming process
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Formed NeXT Inc., a company that manufactured high-end computers running on a variation of BSD called NeXTSTEP. One of these computers was used by Tim Berners-Lee as the first webserver to create the World Wide Web.
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Windows 95 was released, combining MS-DOS 7.0 with Windows on the same medium, removing the need of getting a separate MS-DOS license.
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The operating system was first released in 1999 as Mac OS X Server 1.0.