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                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. | 
             
         
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