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4 definitions found
 for MS-DOS
From WordNet (r) 3.0 (2006) :

  MS-DOS
      n 1: an operating system developed by Bill Gates for personal
           computers [syn: MS-DOS, Microsoft disk operating
           system]

From V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014) :

  MSDOS
         MicroSoft Disk Operating System (MS, OS, PC)
         

From The Jargon File (version 4.4.7, 29 Dec 2003) :

  MS-DOS
   /M?S?dos/, n.
  
      [MicroSoft Disk Operating System] A clone of CP/M for the 8088 crufted
      together in 6 weeks by hacker Tim Paterson at Seattle Computer Products,
      who called the original QDOS (Quick and Dirty Operating System) and is said
      to have regretted it ever since. Microsoft licensed QDOS in order to have
      something to demo for IBM on time, and the rest is history. Numerous
      features, including vaguely Unix-like but rather broken support for
      subdirectories, I/O redirection, and pipelines, were hacked into
      Microsoft's 2.0 and subsequent versions; as a result, there are two or more
      incompatible versions of many system calls, and MS-DOS programmers can
      never agree on basic things like what character to use as an option switch
      or whether to be case-sensitive. The resulting appalling mess is now the
      highest-unit-volume OS in history. Often known simply as DOS, which annoys
      people familiar with other similarly abbreviated operating systems (the
      name goes back to the mid-1960s, when it was attached to IBM's first disk
      operating system for the 360). The name further annoys those who know what
      the term operating system does (or ought to) connote; DOS is more
      properly a set of relatively simple interrupt services. Some people like to
      pronounce DOS like ?dose?, as in ?I don't work on dose, man!?, or to
      compare it to a dose of brain-damaging drugs (a slogan button in wide
      circulation among hackers exhorts: ?MS-DOS: Just say No!?). See mess-dos.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  Microsoft Disk Operating System
  Microsoft DOS
  MS-DOS
  
      /M S doss/ (Or "MS-DOS", "PC-DOS",
     "{MS-DOG", "{mess-dos}") Microsoft Corporation's clone of
     the CP/M disk operating system for the 8088 crufted
     together in 6 weeks by hacker Tim Paterson, who is said to
     have regretted it ever since.
  
     MS-DOS is a single user operating system that runs one
     program at a time and is limited to working with one megabyte
     of memory, 640 kilobytes of which is usable for the
     application program.  Special add-on EMS memory boards
     allow EMS-compliant software to exceed the 1 MB limit.
     Add-ons to DOS, such as Microsoft Windows and DESQview,
     take advantage of EMS and allow the user to have multiple
     applications loaded at once and switch between them.
  
     Numerous features, including vaguely Unix-like but rather
     broken support for subdirectories, I/O redirection and
     pipelines, were hacked into MS-DOS 2.0 and subsequent
     versions; as a result, there are two or more incompatible
     versions of many system calls, and MS-DOS programmers can
     never agree on basic things like what character to use as an
     option switch ("-" or "/").  The resulting mess became the
     highest-unit-volume operating system in history.  It was
     used on many Intel 16 and 32 bit microprocessors and IBM
     PC compatibles.
  
     Many of the original DOS functions were calls to BASIC (in
     ROM on the original IBM PC), e.g. Format and Mode.  People
     with non-IBM PCs had to buy MS-Basic (later called
     GWBasic).  Most version of DOS came with some version of
     BASIC.
  
     Also know as PC-DOS or simply DOS, ignoring the fact that
     there were many other OSes with that name, starting in the
     mid-1960s with IBM's first disk operating system for the
     IBM 360.
  
     [{Jargon File]
  
     (2007-05-21)
  

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