Circuit for interfacing mouse input device to computer system
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United States of America Patent
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-
Dec 12, 1989
Grant Date -
N/A
app pub date -
May 19, 1987
filing date -
May 19, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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