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    Information Research Services Updated: 19 August 1997
         
     
           
        The PDP-11/20 was the first minicomputer to interface all system elements -- processor, memory and peripherals -- to a single, bi-directional, asynchronous bus. The UNIBUS enabled fast devices to send, receive or exchange data without intermediate buffering in memory. The PDP-11 became the world's most successful family of minicomputers.