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    Information Research Services Updated: 19 November 1997
         
     
           
        The PDP-4 was aimed at applications with not many calculations, but rather the single manipulation of input and output, such as controlling a bakery or fleet of elevators. "As computers [like the PDP-4] become smaller and less expensive," said Bell, "they will take over some special system types...then the computer becomes a 'module' of the system."