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Programmable calculator including multifunction keys

  • US 4,178,633 A
  • Filed: 06/01/1977
  • Issued: 12/11/1979
  • Est. Priority Date: 12/27/1971
  • Status: Expired due to Term
First Claim
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1. An electronic calculator comprising:

  • keyboard input means including a plurality of alphabetic, numeric, and function keys for entering alphameric information, including algebraic statements, into the calculator, at least one of said function keys representing a plurality of different predetermined functions, each of said plurality of different predetermined functions being designated by a predetermined different number of successive actuations of said one or more of said function keys;

    memory means, coupled to said keyboard input means, for storing alphameric information entered into the calculator from said keyboard input means;

    processing means, coupled to said keyboard input means and memory means, for processing alphameric information entered into the calculator and stored in said memory means to perform selected functions and to compute the results of selected algebraic statements; and

    output means, coupled to said processing means, for providing a visual indication of selected alphameric information;

    said processing means including logic means responsive to a particular number of successive actuations of one of said one or more of said function keys for causing entry of the one of said different predetermined functions associated therewith that has been designated by the particular number of successive actuations of that key, said processing means thereafter being operative for performing the entered function designated by the particular number of successive actuations of that key without at the same time performing any of the other predetermined functions represented by that key.

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