Calculator with definable keys

Details Calculator with definable keys Calculator with definable keys

1985-09-04

1987-03-03

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365S, 340365VL, 364709, G06F 302

Patent

active

046479112

ABSTRACT:
A programmable calculator is disclosed which has a plurality of keys each having a unique definition as an input key for introduction of instruction statements and constants through associated definition instructions. In the calculator, instruction definable keys each allow a definition instruction distinguishable from the first named definition instructions to be programmed. Each keys specific definition is defined by input keys which introduce different pieces of information as by depression of a conventional shift key. The information is introduced by the user to define the definable keys to perform desired instructions.

REFERENCES:
patent: 4145742 (1979-03-01), Olander
patent: 4241333 (1980-12-01), Giebler
patent: 4243845 (1981-01-01), Feinberg
patent: 4277651 (1981-07-01), Fisher
patent: 4291385 (1981-09-01), Osborne
patent: 4324954 (1982-04-01), Taylor

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