VGA and EGA video controller apparatus using shared common video

Details VGA and EGA video controller apparatus using shared common video VGA and EGA video controller apparatus using shared common video

1992-03-26

1995-01-03

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345132, G09G 102

Patent

active

053790529

ABSTRACT:
A video controller board for supporting AX Japanese modes and enhanced VGA modes. The board includes two EGA video controllers to support the AX standard and a VGA video controller to support the enhanced VGA standard. Video memory sufficient to support the AX standard is shared by the VGA and EGA controllers. An interface renders the diverse protocols of the VGA and EGA controllers compatible with the shared memory so that each controller sees the memory in a configuration in accordance with its own protocol.

REFERENCES:
patent: 4990904 (1991-02-01), Zenda
patent: 5072411 (1991-12-01), Yamaki
patent: 5142676 (1992-08-01), Fried
patent: 5189401 (1993-02-01), Kugler, Jr. et al.

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