G - Physics – 09 – G
Patent
G - Physics
09
G
375/18
G09G 1/02 (2006.01) G09G 5/02 (2006.01) G09G 5/393 (2006.01)
Patent
CA 1175963
BC9-81-005 Abstract: Apparatus and Method for Reading and Writing Text Characters in a Graphics Display Apparatus and method for writing text characters to a raster scan video display operated in an all-points- addressable, or graphics, mode, and fox reading characters thus written. A graphic video display buffer directly refreshes the display with graphics data received from a microprogrammed processor. The processor writes a character to the display by selecting and loading into the graphics video display buffer a text character dot pattern retrieved from main storage, and reads a charac- ter previously written by comparing a dot pattern retrieved from the display buffer with dot patterns retrieved from main storage. To write a character to the display in color, the graphic dot image of a selected character retrieved from main storage is expanded to a selected pixel and color format, and stored in the graphics video display buffer. Text characters thus written in color are read by retrieving from the display buffer the expanded dot image, restoring the expanded dot image to its original form, and comparing the restored dot image with graphic dot images retrieved from storage.
406361
International Business Machines Corporation
Kerr Alexander
LandOfFree
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