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Keyboard Scanner Disclosure Number: IPCOM000053727D
Original Publication Date: 1981-Nov-01
Included in the Prior Art Database: 2005-Feb-12

Publishing Venue


Related People

Heybruck, WF Hubacher, EM [+details]


The drawing shows a keyboard 2 having an array of key-operated switches 3, 4. Each switch is connected between a row wire X1...Xn and a column wire Y1...Yn. The circuit of the drawing scans the row and column wires and produces an output on a line 5 that identifies a switch that has been closed. For the scanning operation, each row or column wire is driven by an AND Invert (AI) gate.