Single-chip semiconductor unit and key input for variable functi

Details Single-chip semiconductor unit and key input for variable functi Single-chip semiconductor unit and key input for variable functi

1982-03-18

1984-11-27

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 302, G06F 3147, G06F 900, G06F 1300

Patent

active

044854552

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, jump-condition circuits, a clock generator, a timing generator, decoders, key input logic, a data storage array, an 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. 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: 3036773 (1962-05-01), Brown
Reference Manual-IBM 7090, Data Processing System-A22-6528-3, Aug. 1961, pp. 6-9 and 74.

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