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 for pdp-10
From The Jargon File (version 4.4.7, 29 Dec 2003) :

      [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/.

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