Scientific electronic calculator for performing mathematical ope

Details Scientific electronic calculator for performing mathematical ope Scientific electronic calculator for performing mathematical ope

1993-06-08

1995-01-10

Malzahn, David H.

Boots, shoes, and leggings

36471011, G06F 3147

Patent

active

053813537

ABSTRACT:
Scientific electronic calculator comprising an input device such as a keyboard for inputting operational information including the operands and operators to the calculator, a display device for displaying the input operational information and results of performed mathematical operations, a central processing unit for controlling the input of the operational information, operations and displays, a first storage memory composed of a ROM for storing a program of sequential operations to be executed by the central processing unit, a second storage device composed of a RAM for storing numeric values and expression operands, and a storage and display buffer device composed of a RAM for preparing an operand assembly having the order of a parenthesis open, the numeral, numerical term or numerical expression operands stored in the second storage device, and a parenthesis close. In operation, the calculator instructs the central processing unit to display an operand assembly prepared in the storage and display buffer device in the display device in response to an instructions by the input device to display the numerical stored in the second storage device.

REFERENCES:
patent: 4159525 (1979-06-01), Olander, Jr. et al.
patent: 4695983 (1987-09-01), Oda et al.
patent: 4718029 (1988-01-01), Morino et al.
patent: 5285399 (1994-02-01), Nishiguchi et al.

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