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    Information Research Services Updated: 19 November 1997
         
     
           
        Bell based the PDP-5 on a 12-bit digital controller (the DC-12) that DIGITAL had designed in 1961 but never built. Bell specified the instruction set in the fall of 1962. Design work was continued by Edson deCastro in early 1963. Shown here is the 7th PDP-5 built.