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UNLIMITED ROLL KEYBOARD CIRCUIT

  • US 3,675,239 A
  • Filed: 09/14/1970
  • Issued: 07/04/1972
  • Est. Priority Date: 09/14/1970
  • Status: Expired due to Term
First Claim
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1. An unlimited roll keyboard circuit for controlling the flow of a key code of any newly depressed key to a key code data collector means during the continued depression of any other key, comprising:

  • a. keyboard switch means having a plurality of key means therein for sending out a binary bit from each depressed key means during each timing cycle;

    b. an array of bistable means, the keyboard switch means being connected to a first section of the array of bistable means for allowing the inputting of a binary bit from each depressed key means into the first section of the array;

    c. timing means for transferring the binary bits from the first section of the array of bistable means serially into a second section of the array of bistable means during a timing cycle;

    d. compare means for comparing the binary bitsserially coming out of the first section of the array of bistable means with the binary bits serially coming out of the second section of the array of bistable means, during any timing cycle.

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