Bi-directional manual pulse generator

Claim 1

IN A DISPLAY SYSTEM INCLUDING A DIGITAL MEMORY HAVING A PLURALITY OF LOCATIONS WHEREIN EACH LOCATION STORES A CHARACTER CODE AND A MEMORY ADDRESS REGISTER FOR STORING ADDRESS INFORMATION IDENTIFYING ONE OF SAID PLURALITY OF LOCATIONS; A SOURCE OF TIMING PULSES; MEANS RESPONSIVE TO EACH OF SAID TIMING PULSES FOR INCREMENTING SAID ADDRESS INFORMATION IN SAID MEMORY ADDRESS REGISTER TO CAUSE SAID MEMORY ADDRESS REGISTER TO SUCCESSIVELY DEFINE EACH OF A PLURALITY OF DIFFERENT STATES EQUAL IN NUMBER TO SAID PLURALITY OF MEMORY LOCATIONS; MEANS COUPLED TO SAID MEMORY ADDRESS REGISTER FOR SUCCESSIVELY ACCESSING THE CHARACTER CODES FROM SAID MEMORY LOCATIONS SUCCESSIVELY IDENTIFIED BY SAID MEMORY ADDRESS REGISTER; CHARACTER GENERATOR MEANS RESPONSIVE TO SAID SUCCESSIVELY ACCESSED CHARACTER CODES FOR SUCCESSIVELY GENERATING VIDEO SIGNALS; DISPLAY MEANS RESPONSIVE TO SAID SUCCESSIVELY GENERATED VIDEO SIGNALS FOR SUCCESSIVELY DISPLAYING CHARACTERS REPRESENTED BY SAID VIDEO SIGNALS; A BI-DIRECTIONAL COUNTER CAPABLE OF SUCCESSIVELY DEFINING A PLURALITY OF DIFFERENT STATES EQUAL IN NUMBER TO SAID NUMBER OF MEMORY LOCATIONS; AN INDEX PULSE GENERATOR; DETECTOR MEANS RESPONSIVE TO A UNIQUE STATE DEFINED BY SAID COUNTER FOR ACTUATING SAID INDEX PULSE GENERATOR; SAID DISPLAY MEANS RESPONSIVE TO SAID ACTUATION OF SAID INDEX PULSE GENERATOR FOR DISPLAYING A MARKER; MEANS CONNECTING SAID SOURCE OF TIMING PULSES TO SAID COUNTER FOR INCREMENTING SAID COUNTER IN SYNCHRONISM WITH SAID MEMORY ADDRESS REGISTER; AND MANUALLY OPERABLE BI-DIRECTIONAL PULSE GENERATOR MEANS CONNECTED TO SAID COUNTER FOR ENABLING SAID CYCLE DEFINED BY SAID COUNTER TO BE SHIFTED IN TIME WITH RESPECT TO SAID CYCLE DEFINED BY SAID MEMORY ADDRESS REGISTER.