Display system with graphics cursor

Details Display system with graphics cursor Display system with graphics cursor

G - Physics

09

G

375/11

G09G 5/08 (2006.01)

Patent

CA 2021828

A display system has cursor definition memory for storing data defining a graphics cursor, a cache for the temporary storage of a portion of the graphics cursor for display on a display device, the cache being such that its data rate is sufficient to support the display of the graphics cursor, and control logic for updating the cache from the cursor definition memory at a slower data rate. The cache need only be large enough to store a portion of the cursor at any one time as the graphics cursor is only displayed for a fraction, for example one-tenth, of a scan line and the cache can be updated during the portion of the scan time when the cursor is not displayed. Through the use of a small cache operable at the required data rate, inexpensive memory which does not support the required data rate can be used for the cursor definition memory.

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