Key switch input control circuit

Details Key switch input control circuit Key switch input control circuit

1981-08-25

1984-11-13

Malzahn, David H.

Boots, shoes, and leggings

364709, G06F 302

Patent

active

044829787

ABSTRACT:
In an instrument such as an electronic desk-top or pocket calculator, an exposure meter or the like, having a plurality of data-inputting switches in the form of a pushbutton switch, key switch, pressure or touch sensor switch, a control switch is provided for preventing inadvertent change of data stored or registered in the instrument. To this end, gates are interposed between the data inputting switches and a data storage member in the instrument. The instrument could alternatively include a microcomputer programmed to change its stored data in response to the operation of the input switches and to be prevented from changing the data upon operation of the control switch.

REFERENCES:
patent: 4021656 (1977-05-01), Caudel et al.
patent: 4028538 (1977-06-01), Olander, Jr. et al.
patent: 4064399 (1977-12-01), Maranaka
patent: 4075690 (1978-02-01), Shinoda et al.
patent: 4139864 (1979-02-01), Schulman
patent: 4185210 (1980-01-01), Zuk
patent: 4267578 (1981-05-01), Vetter

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