VGA and EGA video controller apparatus using shared common video memory
US5379052A · kind A · utility
3Cited by
4References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1992 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Mar 26, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/39
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.