Data display centering and expansion system

Claim 1

IN A DATA PROCESSING SYSTEM, DISPLAY MEANS, AND MEANS FOR OPERATIVELY SUPPLYING TO SAID DISPLAY MEANS SUCCESSIVE GROUPS OF SIGNALS REPRESENTING MESSAGES AND DIGITAL DISPLAY ADDRESSES RELATED THERETO, SAID DISPLAY MEANS HAVING A DISPLAY SCREEN, SAID ADDRESSES OCCURRING ALONG AN AXIS OF SAID SCREEN DIVISABLE EVENLY INTO CONSECUTIVE ADDRESS GROUPS COMPRISING INTEGRAL DIVISIONS OF SAID AXIS, MEANS OPERATIVE TO PROVIDE A DIGITAL KEY ADDRESS REPPRESENTATIVE OF A POSITIONAL VALUE ON SAID SCREEN EXPANSION LEVEL CONTROL MEANS, MESSAGE DISPLAY SELECTION MEANS COMPRISING LOGICAL DECODER MEANS SENSITIVE TO A HIGH ORDER PORTION OF SAID KEY ADDRESS TO DEFINE AN ADDRESS DECISION, INTEVAL OF WHICH THE KEY ADDRESS IS A MEMBER, SAID LOGICAL DECODER MEANS BEING OPERATIVE TO PERMIT DISPLAY OF ONLY THOSE MESSAGES WHOSE UNALTERED ADDRESS EQUIVALENT CONTAINS HIGH ORDER BITS DEFINING A DISPLAY INTERVAL CONTAINING SAID DECISION INTERVAL AND CENTERING AND EXPANSION MEANS COMPRISING CONTROLLABLE MEANS TO SHIFT THE WEIGHT SIGNIFICANCE OF THE MESSAGE ADDRESS N ORDERS AND TO DELETE N HIGH ORDER BITS THEREOF, WHEREIN N IS THE POWER TO WHICH EXPANSION IS TO BE EFFECTED.