Method and apparatus for storing and retrieving keyboard LED dat

Details Method and apparatus for storing and retrieving keyboard LED dat Method and apparatus for storing and retrieving keyboard LED dat

1983-02-28

1987-08-04

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340711, 340365E, 340365S, 340802, G09G 300

Patent

active

046849343

ABSTRACT:
An apparatus and method for storing and retrieving information indicative of the state of a plurality of keyboard LED's is disclosed. A RAM is employed to store the current status of all keyboard LED's. Programmed array logic cyclically generates RAM addresses to cause RAM data to be supplied to an LED array. The RAM addresses are also supplied to a decoder to generate additional LED array activation signals. LED's which are activated by both a RAM data output and a decoder output are illuminated. Each RAM address affects a different subset of the keyboard LED's. The programmed array logic generates each RAM address several times per second such that the LED's which are activated appear to be constantly on. Apparatus is also disclosed to update the data stored in the RAM.

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