Electronic calculator with display and keyboard scanning signal

Details Electronic calculator with display and keyboard scanning signal Electronic calculator with display and keyboard scanning signal

1973-09-24

1976-10-19

Shaw, Gareth D.

Communications: electrical

Digital comparator systems

340365S, G06F 300

Patent

active

039874168

ABSTRACT:
An electronic calculator system of the type having a keyboard input and a visual display readout is implemented in MOS/LSI semiconductor chips having a data memory, an arithmetic unit, a read-only-memory for storing instruction words, and control circuitry for operating the system in response to keyboard inputs, all in monolithic semiconductor units. The keyboard and display are scanned by timing signals generated in the semiconductor unit by a register associated with the data memory.

REFERENCES:
patent: 3623082 (1971-11-01), Stein et al.
patent: 3631403 (1971-12-01), Asbo et al.
patent: 3639742 (1972-02-01), Drage et al.
patent: 3676656 (1972-07-01), Schmidt
patent: 3688263 (1972-08-01), Balogh, Jr. et al.
patent: 3702988 (1972-11-01), Haney et al.
patent: 3745536 (1973-07-01), Klehm, Jr.
patent: 3748452 (1973-07-01), Ruben
patent: 3757308 (1973-09-01), Fosdick
patent: 3760171 (1973-09-01), Wang et al.
patent: 3781852 (1973-12-01), White et al.
patent: 3800129 (1974-03-01), Umstattd

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