Display system for a data processing unit

Claim 1

IN A DATA PROCESSING SYSTEM OF THE TYPE HAVING A CENTRAL PROCESSING UNIT OPERATING TO STORE A PLURALITY OF DATA FILES IN MACHINE FORMAT, AND ONE OF SAID DATA FILES COMPRISES A PLURALITY OF ALPHANUMERICAL CHARACTERS,A DATA RETRIEVAL SYSTEM, COMPRISING, A PLURALITY OF FIRST STATIONS CONNECTED IN COMMON TO SAID CENTRAL PROCESSING UNIT, SECOND STATIONS CONNECTED TO AT LEAST CERTAIN OF SAID FIRST STATIONS, EACH STATION INCLUDING A KEYBOARD FOR ENTERING A REQUEST INTO SAID PROCESSING UNIT FOR ONE OF SAID DATA FILES, A DARK TRACE DISPLAY TUBE ASSOCIATED WITH EACH OF SAID STATIONS AND EQUIPPED WITH A SUITABLE PORTION FOR DISPLAYING THE REQUESTED DATA FILE, CONTROL MEANS INCLUDING MANUALLY OPERABLE MEANS IN EACH OF SAID STATIONS FOR ACTIVATING ONE OF SAID STATIONS AND FOR LOCKING OUT THE REMAINING OF SAID STA. TIONS, CHARACTER FORMING MEANS COMMON TO ALL OF SAID STATIONS AND RESPONSIVE TO SAID CENTRAL PROCESSOR FOR TRANSLATING SAID MACHINE FORMAT OF SAID REQUESTED DATA CHARACTERS INTO A DISPLAY FORMAT REPRESENTATIVE OF THE VISUAL IMAGE OF EACH OF SAID DATA CHARACTERS, EACH OF SAID DISPLAY TUBES BEING EQUIPPED WITH AN ELECTRON BEAM FORMING MEANS AND A HORIZONTAL MAGNETIC DEFLECTION YOKE AND A VERTICAL MAGNETIC DEFLECTION YOKE, UNBLANKING MEANS ASSOCIATED WITH EACH OF SAID TUBES AND RESPONSIVE TO SAID CONTROL MEANS SAID CHARACTER FORMING MEANS FOR ACTIVATING SAID BEAM FORMING MEANS OF SAID ACTIVATED STATION AND FOR PRODUCING BEAM OPERATION AT SAID ACTIVATED STATION CORRESPONDING TO SAID DISPLAY FORMAT, SAID YOKES OF SAID ACTIVATED STATION BEING OPERATIVE IN MOVING ITS ASSOCIATED BEAM ACROOS THE DISPLAY PORTION OF ITS CORRESPONDING TUBE, COUNTER MEANS CONNECTED IN COMMON TO ALL OF SAID STATIONS FOR PRODUCING DISCRETE FIRST HORIZONTAL AND VERTICAL DEFLECTION SIGNALS,