System for selectively coupling trackball and mouse through a switch where input device provides coded signal to disable trackball while permitting signals from mouse
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
Jul 25, 1994
filing date -
Jul 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A trackball enable/disable system is disclosed for use in a personal computer to permit selective activation and deactivation of a trackball or mouse device. The system includes a keyboard controller that detects the selection of a hot key (or combination of keys) by the operator, and in response either enables or disables the trackball. In one embodiment, the controller includes an associated flag, and sets or reset a the flag in response to hot key selection. Signals from the trackball are received by the keyboard controller and assembled in preparation for transmission to the CPU. Before the trackball data is transmitted to the CPU, the status of the flag is checked to determine if the trackball is enabled or disabled. If disabled, the trackball data is not sent to the CPU. In an alternative embodiment, a pair of switches are provided between the trackball and the controller. If the hot key is selected, the keyboard controller connects or disconnects the trackball by an appropriate control signal to the switches on a control line.
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