Computer graphics processing and selective visual display system – Computer graphics display memory system – Graphic display memory controller
Reexamination Certificate
2005-03-16
2010-06-29
Mengistu, Amare (Department: 2629)
Computer graphics processing and selective visual display system
Computer graphics display memory system
Graphic display memory controller
C345S530000, C345S533000
Reexamination Certificate
active
07746349
ABSTRACT:
To display a row of characters in the VGA alphanumeric mode, the ASCII and attribute bits for all such characters are retrieved from the main memory and stored in a local cache memory. The font and unused bits that are also retrieved from the memory during the retrieval of ASCII and attribute bits are discarded. The stored ASCII and attribute bits for each such character is then used to compute the address of the associated font bits in the main memory. Next, for each character, the font bits are retrieved from the main memory using a burst read operation and using the computed address for that font. The font bits associated with all the characters in the row are stored in the local cache memory and are subsequently scanned out to be used in the display of the characters.
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Rao Krishnaraj S.
Reed David G.
Treichler Sean Jeffrey
Guertin Aaron M
Mengistu Amare
NVIDIA Corporation
Townsend and Townsend / and Crew LLP
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