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Calculator with equation display device

  • US 4,386,412 A
  • Filed: 12/09/1980
  • Issued: 05/31/1983
  • Est. Priority Date: 12/17/1979
  • Status: Expired due to Term
First Claim
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1. An equation display device for a calcuator, comprising:

  • a key input section including at least numerical entry keys and function keys of +, -, ×

    , ÷

    , etc., for inputting numeral data and function data according to a calculation equation;

    a memory coupled to said key input section for storing the numeral data and function data inputted from said key input section;

    calculating means coupled to said memory for performing a calculation, according to the calculation equation, based on the data stored in said memory;

    a display section coupled to said calculating means for displaying a result of calculation outputted from said calculating means;

    input control means coupled to said memory for judging the data inputted by the operation of said numerical entry keys and said function keys of said key input section and for performing a key input processing;

    character equation preparing means coupled to, and controlled by, said input control means for treating the data inputted by said key operation according to the calculation equation such that each numeral data is replaced by respective character data in the order of inputting of the numeral data, and for preparing display data so that the inputted calculation equation is displayed in the form of a character equation;

    a display register coupled to said character equation preparing means for sequentially storing the character equation display data prepared by said character equation preparing means; and

    display control means coupled to said display register and responsive to said character equation display data outputted from said display register for displaying the character equation on said display section.

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