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2 definitions found
 for PDP-10
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  PDP-10
   n.
  
      [Programmed Data Processor model 10] The machine that made timesharing
      real. It looms large in hacker folklore because of its adoption in the
      mid-1970s by many university computing facilities and research labs,
      including the MIT AI Lab, Stanford, and CMU. Some aspects of the
      instruction set (most notably the bit-field instructions) are still
      considered unsurpassed. The 10 was eventually eclipsed by the VAX
      machines (descendants of the PDP-11) when DEC recognized that the 10
      and VAX product lines were competing with each other and decided to
      concentrate its software development effort on the more profitable VAX.
      The machine was finally dropped from DEC's line in 1983, following the
      failure of the Jupiter Project at DEC to build a viable new model. (Some
      attempts by other companies to market clones came to nothing; see Foonly
      and Mars.) This event spelled the doom of ITS and the technical
      cultures that had spawned the original Jargon File, but by mid-1991 it had
      become something of a badge of honorable old-timerhood among hackers to
      have cut one's teeth on a PDP-10. See TOPS-10, ITS, BLT, DDT, EXCH
      , HAKMEM, pop, push. See also http://www.inwap.com/pdp10/.
  

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

  PDP-10
  
      Programmed Data Processor model 10.
  
     The series of mainframes from DEC that made time-sharing
     real.  It looms large in hacker folklore because of its
     adoption in the mid-1970s by many university computing
     facilities and research labs, including the MIT AI Lab,
     Stanford, and CMU.  Some aspects of the instruction set
     (most notably the bit-field instructions) are still considered
     unsurpassed.
  
     The PDP-10 was eventually eclipsed by the VAX machines
     (descendants of the PDP-11) when DEC recognised that the
     PDP-10 and VAX product lines were competing with each other
     and decided to concentrate its software development effort on
     the more profitable VAX.  The machine was finally dropped from
     DEC's line in 1983, following the failure of the Jupiter
     Project at DEC to build a viable new model.  (Some attempts by
     other companies to market clones came to nothing; see Foonly
     and Mars.)  This event spelled the doom of ITS and the
     technical cultures that had spawned the original Jargon
     File, but by mid-1991 it had become something of a badge of
     honourable old-timerhood among hackers to have cut one's teeth
     on a PDP-10.
  
     See TOPS-10, AOS, BLT, DDT, DPB, EXCH, HAKMEM,
     JFCL, LDB, pop, push.
  
     news:alt.sys.pdp10
  
     [Was the PDP-10 a mini or a mainframe?]
  
     (2001-01-05)
  

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