Electronic calculator having keyboard for entering data
AssigneeNippon Electric Co., Ltd.
InventorSusumu Muranaka
Life of this patent
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Abstract
An electronic calculator comprises a semiconductor integrated circuit and an input keyboard which includes the series connection of a condition switch and an operation key, thereby minimizing the number of interconnections between the semiconductor integrated circuit and the keyboard.
Claims11
An electronic calculator comprising:
- a semiconductor integrated circuit having an arithmetic operation circuit, a control circuit and a terminal for receiving command signals for said operation and control circuits;
- a condition switch for generating a first command signal for said semiconductor integrated circuit, said switch being fixed to continue generating said first command signal once said switch is set to generate said first command signals;
- and an operation key for generating a second command signal for the calculator to perform a required arithmetic operation;
- wherein said operation key is connected between said condition switch and said terminal of said semiconductor integrated circuit, and said first and second command signals generated by said condition switch and said operation key are applied to said terminal of said semiconductor integrated circuit.
In combination in an electronic calculator, condition switch means having plural inputs, a common ouput, and means for connecting one of said inputs with said output, a calculator integrated circuit having an input terminal, and an operation key connected between said common output of said condition switch means and said input terminal of said calculator integrated circuit.
Dependencies are inferred from the claim text.