| 摘要 |
A method and apparatus which provides bi-directional communication between a video monitor and a computer system unit. This enables the video monitor to inform the system unit of its capabilities without direct user involvement and also enables the system unit to directly control or adjust all the functions of the video monitor. In the preferred embodiment, bi-directional communication between the video monitor and the system unit is provided utilizing a mouse port in the keyboard controller. Multiplexors are coupled between the mouse port and each of the mouse and video monitor to select between data paths and selectively allow communication between the system unit and the video monitor. Monitor control software is included in the system unit which can be used to control or adjust the output of the video monitor. When a user desires to adjust the output of the video monitor, the monitor control software directs the multiplexors to provide a communication path between the system unit and the video monitor, and the system unit relates the control information input from the user to the video monitor, which adjusts its visual output accordingly. Also, at each power-on of the computer system, the data path between the keyboard controller and video monitor is selected to enable the video monitor to provide capability information to the system unit.
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