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Abstract

A video generation logic for a display controller includes a precoded PROM which combines visual attributes associated with the characters of information to be displayed on the display screen to produce multiple video control signals for modifying the dot pattern generation signal which is generated in response to character information stored in a refresh memory of the display controller. Visual attribute signals are used as an address to a video attribute generation PROM to retrieve a precoded data word associated with a particular combination of video attributes and the information contained in the retrieved data word is used to provide video control signals. Some of the video control signals are combined with the dot pattern generation signal to provide a video signal which is transmitted to the display monitor which displays the character information. One of the video attribute signals is a low intensity signal, which in the case of a character not having any other visual attributes selected, would result in the character of information being displayed in a reduced intensity level on the screen of the display monitor. Before transmission to the display monitor, this low intensity signal is modified by the video attribute generation PROM as a function of the other selected video attributes.

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First Claim