catflap.org Online Dictionary Query

  PDP-11
       
          Programmed Data Processor model 11.
       
          A series of minicomputers based on an instruction set
          designed by C. Gordon Bell at DEC in the early 1970s (late
          60s?).  The PDP-11 family, which came after, but was not
          derived from, the PDP-10, was the most successful computer
          of its time until it was itself succeeded by the VAX.
       
          Models included the 11/23 and 11/24 (based on the F11
          chipset); 11/44, 11/04, 11/34, 11/05, 11/10, 11/15, 11/20,
          11/35, 11/40, 11/45, 11/70, 11/60 ({MSI and SSI); LSI-11/2
          and LSI-11 (LSI-11 chipset).  In addition there were the 11/8x
          (J11 chipset) and SBC-11/21 (T11 chip) and then there was
          compatibility mode in the early VAX processors.
       
          The B and C languages were both used initially to
          implement Unix on the PDP-11.  The microprocessor design
          tradition owes a heavy debt to the PDP-11 instruction set.
       
          See also SEX.
       
          (1994-12-21)