Variable function programmed calculator

Details Variable function programmed calculator Variable function programmed calculator

1979-01-12

1982-04-20

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 302, G06F 3147, G06F 900

Patent

active

043262651

ABSTRACT:
A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, data storage array, a decimal arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc., and to accommodate these different uses the output decoder is mask-programmable. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.

REFERENCES:
patent: 3638197 (1972-01-01), Brennan, Jr. et al.
patent: 3757308 (1973-09-01), Fosdick
patent: 4074351 (1978-02-01), Boone et al.
patent: 4152769 (1979-05-01), Olander, Jr. et al.
patent: 4152771 (1979-05-01), Olander, Jr. et al.

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