Four wire keyboard interface

Details Four wire keyboard interface Four wire keyboard interface

H - Electricity

03

M

354/236.5

H03M 11/00 (2006.01) H03M 11/20 (2006.01)

Patent

CA 1264095

Abstract A computer system comprises a terminal and a keyboard, the terminal comprises a central control means for controlling the operator of the keyboard and the key- board comprises a switch array, the switch array has a plurality of rows and a plurality of columns. The terminal further comprises a data output port for transmitting a command signal from the terminal central control means and a data input port for receiving a data signal from the keyboard. The command signal comprises a keyboard initialize signal and a keyboard increment signal. The keyboard further comprises a four-wire keyboard interface means for communicating with the terminal. The four-wire keyboard interface means facilitates the initialization of a sequence for scanning the switch array after the receipt of the keyboard clear signal, the scanning of the switch array for detecting the activation of a location of the switch array after the receipt of the keyboard increment signal, and the transmission of the data signal after detecting the activation of the location of the switch array.

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