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    Information Research Services Updated: 20 August 1997
         
             
                   
              July:
Shipments begin of the
PDP-4, DIGITAL's second 18-bit computer.
               
              September:
The
PDP-1 operating system, the world's first timesharing system, is written by engineers at MIT and BBN for the PDP-1.
                     
              Gordon Bell begins design work on the architecture for the PDP-5.