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2 definitions found
 for PDP-20
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  PDP-20
   n.
  
      The most famous computer that never was. PDP-10 computers running the {
      TOPS-10 operating system were labeled ?DECsystem-10? as a way of
      differentiating them from the PDP-11. Later on, those systems running {
      TOPS-20 were labeled ?DECSYSTEM-20? (the block capitals being the result
      of a lawsuit brought against DEC by Singer, which once made a computer
      called ?system-10?), but contrary to popular lore there was never a
      ?PDP-20?; the only difference between a 10 and a 20 was the operating
      system and the color of the paint. Most (but not all) machines sold to run
      TOPS-10 were painted ?Basil Blue?, whereas most TOPS-20 machines were
      painted ?Chinese Red? (often mistakenly called orange).
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  PDP-20
  
     The most famous computer that never was.  PDP-10 computers
     running the TOPS-10 operating system were labelled
     "DECsystem-10" as a way of differentiating them from the
     PDP-11.  Later on, those systems running TOPS-20 were
     labelled "DECSYSTEM-20" (the block capitals being the result
     of a lawsuit brought against DEC by Singer, which once made a
     computer called "system-10"), but contrary to popular lore
     there was never a "PDP-20"; the only difference between a 10
     and a 20 was the operating system and the colour of the
     paint.  Most (but not all) machines sold to run TOPS-10 were
     painted "Basil Blue", whereas most TOPS-20 machines were
     painted "Chinese Red" (often mistakenly called orange).
  
     [{Jargon File]
  
     (1994-12-21)
  

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