Memory control apparatus for a crt controller

Details Memory control apparatus for a crt controller Memory control apparatus for a crt controller

G - Physics

09

G

375/22

G09G 1/00 (2006.01) G09G 5/393 (2006.01)

Patent

CA 1240427

Abstract of the Disclosure A memory control apparatus for a CRT controller is disclosed. When the same data from a data input circuit is loaded into a plurality of addresses of a buffer memory for storing drawing data, the address of the buffer memory is automatically updated. X- and Y- address generators update address data in response to pulses from X- and Y-axis pulse generators. A micropro- cessor supplies to a register the width of the X and Y thickness of an address to be updated, coordinate data representing a write start point to the address generators, and the drawing data to be written to a data input circuit. The memory can then be updated in units specified by the X and Y thickness of the picture element.

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