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Electronic checklist using solid state readouts

  • US 4,251,813 A
  • Filed: 03/05/1979
  • Issued: 02/17/1981
  • Est. Priority Date: 03/05/1979
  • Status: Expired due to Term
First Claim
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1. In an electronic checklist using solid state readouts, characters of alphanumeric information may be displayed by a means comprised of:

  • an operator actuated rotary switch, said switch being connected to an encoder, said encoder having an output forming the most significant bits of a read only memory address, each combination of bits delineating a portion of said memory;

    an operator actuated momentary switch, said switch being one of two inputs to a debouncing circuit, said debouncing circuit having two outputs, one of which forms an input to a counter, said counter having an output forming the next most significant bits of said read only memory address, each combination of bits delineating a portion of read only memory address subsequent to portion delineated by output of said encoder;

    a second input to said debouncing circuit from said encoder in combination thereof with said momentary switch resulting in the activation of a clock, said clock having an output forming the input to a second counter, said second counter having one of a combination of outputs which deactivates said clock after a prescribed number of clock pulses, other outputs of said second counter forming the least significant address bits of said read only memory;

    a decoder having inputs derived from outputs of said second counter, said decoder having one of a number of mutually exclusive outputs each forming an input to an alphanumeric display cluster;

    alphanumeric display clusters each having an input derived from said read only memory, said decoder, said clock, and said second counter, said read only memory containing encoded alphanumeric data, said decoder providing cluster selection, said second counter providing display character selection, and said clock providing character write commands.

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