Mode
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Color ordering
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15 bpp
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1 undefined, 5 red, 5 green, 5 blue (URRR RRGG GGGB BBBB)
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16 bpp
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5 red, 6 green, 5 blue (RRRR RGGG GGGB BBBB)
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24 bpp
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8 red, 8 green, 8 blue
(RRRR RRRR GGGG GGGG BBBB BBBB)
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32 bpp
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8 alpha, 8 red, 8 green, 8 blue
(AAAA AAAA RRRR RRRR GGGG GGGG BBBB BBBB)
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B4.1.4.5.2 Adapter supports gamma correction performed in hardware at 24 bpp or 32 bpp without using VGA resources.
ICM uses this capability to perform gamma correction for the attached monitor and to allow game applications to switch palettes. This capability also supports transition effects in applications. To provide support for ICM, the graphics adapter gamma must be programmatically adjustable. It is required that downloadable RAM digital-to-analog converter entries be included to perform gamma correction in hardware at 24 bpp or 32 bpp.
This capability must be supported without requiring the use of any VGA resources.
B4.1.4.5.3 Driver supports dynamic color bit-depth change.
The graphics adapter must operate properly and must not fail when asked by the operating system to change the color depth or resolution. A restart must not be required to accomplish this.
B4.1.4.6.2 Primary graphics adapter works normally with default VGA mode driver.
Primary graphics adapter works normally with default VGA mode driver
The default VGA driver is required for installing the operating system. The primary adapter must support 4-bit planar VGA mode as described in the Windows DDK.
B4.1.4.6.3Driver does not bypass any Microsoft-provided system components.
This requirement applies for all files normally installed in the System32 directory. These files include, but are not limited to, Win32k.sys, Ntoskrnl.exe, Gdi32.dll, User32.dll, and Mcdsrv32.dll.
B4.1.4.6.4 Adapter supports DDC monitor detection.
And option ROM supports VESA Enhanced Display Data Channel Standard (EDDC), Version 1.0, Level 2B protocols (DDC2B).
The adapter must support the DDC2B host requirements identified in the VESA Enhanced Extended Display Data Channel Standard (E-DDC), Version 1, which defines the communication channel between the display and host system. The software can use this information to properly manage output to the various displays and to prevent the disabling of television output if no monitor is attached. Devices capable of multihead display must support this feature for all attached monitors.
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