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  2. DOS - Wikipedia

    en.wikipedia.org/wiki/DOS

    DOS is a single-user, single-tasking operating system with basic kernel functions that are non-reentrant: only one program at a time can use them, and DOS itself has no functionality to allow more than one program to execute at a time.

  3. List of operating systems - Wikipedia

    en.wikipedia.org/wiki/List_of_operating_systems

    DOS Plus 1.1 – 2.1, a single-user, multi-tasking system derived from Concurrent DOS 4.1 – 5.0; ... (GUI based multitasking operating system for Z80 computers)

  4. Operating system - Wikipedia

    en.wikipedia.org/wiki/Operating_system

    A library operating system (libOS) is one in which the services that a typical operating system provides, such as networking, are provided in the form of libraries and composed with a single application and configuration code to construct a unikernel: [32] a specialized (only the absolute necessary pieces of code are extracted from libraries ...

  5. Unix - Wikipedia

    en.wikipedia.org/wiki/Unix

    This new operating system was initially without organizational backing, and also without a name. The new operating system was a single-tasking system. [17] In 1970, the group coined the name Unics for Uniplexed Information and Computing Service as a pun on Multics, which stood for Multiplexed Information and Computer Services.

  6. Mac OS nanokernel - Wikipedia

    en.wikipedia.org/wiki/Mac_OS_nanokernel

    The initial revision of this software is a single tasking system which delegates most tasks to an emulator running the Motorola 68000 series (68K) version of the operating system. The second major revision supports multitasking, multiprocessing, and message passing, and would be more properly called a microkernel.

  7. Timeline of DOS operating systems - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_DOS_operating...

    Digital Research announces Concurrent CP/M-86, aka Concurrent CP/M, a new CP/M-86-compatible single-user multitasking operating system. Concurrent CP/M allows users to go from one screen to another at the push of a key and programs to directly address up to 1 MB of memory. The first implementation will be on the IBM Displaywriter.

  8. MS-DOS - Wikipedia

    en.wikipedia.org/wiki/MS-DOS

    [15] [16] Microsoft advertised MS-DOS and Xenix together, listing the shared features of its "single-user OS" and "the multi-user, multi-tasking, UNIX-derived operating system", and promising easy porting between them. [17] After the breakup of the Bell System, however, AT&T Computer Systems started selling UNIX System V.

  9. SUNMOS - Wikipedia

    en.wikipedia.org/wiki/SUNMOS

    SUNMOS (Sandia/UNM Operating System) is an operating system jointly developed by Sandia National Laboratories and the Computer Science Department at the University of New Mexico. The goal of the project, started in 1991, is to develop a highly portable, yet efficient, operating system for massively parallel-distributed memory systems.