International Business Machines Corporation

Edward Y Kwong

Matthew Elsner

Yoshio Iida

Omar M Rahim

A color graphic display having a read/write control system for a buffer memory therein. The invention provides Line-on-Line and Underpaint by way of a method which invleves reading the contents of a frame buffer storage location for which new pixel data is being provided, comparing those contents with data representing a display background characteristic or color, and if the result of the comparison is positive, storing the new pixel data in the frame buffer storage location. If the result of the comparison is negative, a selected data value different from the new pixel data is stored in the frame buffer storage location.

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West Hurley, NY, United States of America

Edward Y Kwong