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

1987-05-19

1989-12-12

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340710, G08C 2100

Patent

active

048869414

ABSTRACT:
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 characteristic of a resistive-capacitive charging circuit and are read periodically 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.

REFERENCES:
patent: 4739303 (1988-04-01), Kobayashi

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