Apparatus and method for controlling an electrical switch array

Details Apparatus and method for controlling an electrical switch array Apparatus and method for controlling an electrical switch array

2005-03-22

2005-03-22

Lee, Michael G. (Department: 2876)

Registers

Keyboards

With total transfer to keyboard or the like

C235S14500A, C235S146000

Reexamination Certificate

active

06869011

ABSTRACT:
An electrical switching apparatus configured for low power operation includes: (a) a plurality of switching devices arranged in a switching array permitting sensing of individual switching events by selected switching devices; (b) a switching control device coupled with the switching array that provides power to the switching array for sensing and for a first time interval after a first switching device is actuated. The control device identifies the first switching device during the first time interval and interrupts power to the switching array after the first time interval until the first switching device is deactuated. The control device provides power to the switching array for a second time interval after the first switching device is deactuated. The control device determines during the second time interval whether a second switching device other than the first switching device is actuated.

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IBM (NN76081027), Keyboard Test, Aug. 1976.

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