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3 definitions found
 for OS/2
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014) :

  OS2
         Operating System /2 (IBM, OS), "OS/2"
         

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

  OS/2
   /O S too/, n.
  
      The anointed successor to MS-DOS for Intel 286- and 386-based micros; proof
      that IBM/Microsoft couldn't get it right the second time, either. Often
      called ?Half-an-OS?. Mentioning it is usually good for a cheap laugh among
      hackers ? the design was so baroque, and the implementation of 1.x so
      bad, that three years after introduction you could still count the major {
      apps shipping for it on the fingers of two hands ? in unary. The 2.x
      versions were said to have improved somewhat, and informed hackers rated
      them superior to Microsoft Windows (an endorsement which, however, could
      easily be construed as damning with faint praise). In the mid-1990s IBM put
      OS/2 on life support, refraining from killing it outright purely for
      internal political reasons; by 1999 the success of Linux had effectively
      ended any possibility of a renaissance. See monstrosity, cretinous, {
      second-system effect.
  

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

  OS/2
  Merlin
  Warp
  
     /O S too/ IBM and Microsoft's successor to the MS-DOS
     operating system for Intel 80286 and Intel 80386-based
     microprocessors.  It is proof that they couldn't get it
     right the second time either.  Often called "Half-an-OS".  The
     design was so baroque, and the implementation of 1.x so bad,
     that 3 years after introduction you could still count the
     major application programs shipping for it on the fingers of
     two hands, in unary.  Later versions improved somewhat, and
     informed hackers now rate them superior to Microsoft
     Windows, which isn't saying much.  See second-system
     effect.
  
     On an Intel 80386 or better, OS/2 can multitask between
     existing MS-DOS applications.  OS/2 is strong on
     connectivity and the provision of robust virtual machines.
     It can support Microsoft Windows programs in addition to its
     own native applications.  It also supports the Presentation
     Manager graphical user interface.
  
     OS/2 supports hybrid multiprocessing (HMP), which provides
     some elements of symmetric multiprocessing (SMP), using
     add-on IBM software called MP/2.  OS/2 SMP was planned for
     release in late 1993.
  
     After OS/2 1.x the IBM and Microsoft partnership split.
     IBM continued to develop OS/2 2.0, while Microsoft developed
     what was originally intended to be OS/2 3.0 into Windows NT.
     In October 1994, IBM released version OS/2 3.0 (known as
     "Warp") but it is only distantly related to Windows NT.
     This version raised the limit on RAM from 16MB to 1GB (like
     Windows NT).
  
     IBM introduced networking with "OS/2 Warp Connect", the first
     multi-user version.  OS/2 Warp 4.0 ("Merlin") is a network
     operating system.
  
     http://mit.edu:8001/activities/os2/os2world.html)">(http://mit.edu:8001/activities/os2/os2world.html).
  
     [Dates?]
  
     [{Jargon File]
  
     (1995-07-20)
  

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