METHOD AND APPARATUS FOR EFFICIENT MEMORY-READ OPERATIONS WITH A VGA-COMPLIANT VIDEO DISPLAY ADAPTOR

摘要

The efficiency of reading information from video RAM in a display adaptor such as a VGA-compliant adaptor is improved by providing the desired information from a latch whenever possible rather than reading the desired information from video RAM or cache memory. Routine operations with graphical user interfaces such as moving and resizing visual images can be improved by first reading information for all pixels stored in a given location stored in video RAM before executing any commands that modify the contents of that location.