Circuit for interfacing mouse input device to computer system

Details Circuit for interfacing mouse input device to computer system Circuit for interfacing mouse input device to computer system

G - Physics

06

F

354/231, 340/135

G06F 3/033 (2006.01) G06K 11/18 (1990.01)

Patent

CA 1296404

ABSTRACT OF THE DISCLOSURE A computer system mouse-type input device. Movements of a track-ball motion sensor are converted to quadrature signals and are accumulated in a counting circuit. The contents of the counter are pulse-position modulated with waveforms characteris- tic of a resistive-capacitive charging circuit and are read peri- odically by a computer input channel normally used for input of potentiometer-generated commands. The pulse-position modulated signals are converted to digital values used by the computer to position the cursor on a display screen. -31-

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