Display Monitor Detection and Self Configuration for Personal Computer
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
A technique is described whereby video driver circuitry automatically determines four different types of display monitor configurations attached to a personal computer. The concept differs from prior art in that the setting of a dip switch is eliminated for four different types of monitor configurations. Since each monitor has a unique input terminator circuit at both the horizontal and vertical synchronization input signal sections, video driver 10, as shown in the figure, uses a bidirectional transceiver circuit for the same signals. In normal operation, video driver 10 sends out a horizontal and vertical sync signal derived from the respective drive signals in order to maintain the CRT display in synchronization with the video outputs.