Download AMD Geode SC1201 Specifications

32087C
Video BIOS Support
13.1.17.14Subfunction 1Bh: Sum RAMDAC to Gray Scale
Description:
Converts a range of color registers into a gray scale. The shade of gray is based on 30% red, 59% green, and 11%
blue.
Passed:
Parameter
AH
Description
10h
AL
1Bh
BX
Starting index
CX
Number of registers to sum
Returns:
None.
13.1.18 Function 11h - Font Functions
Operates the interface to the VGA loadable fonts.
13.1.18.1 Subfunction 00h: Load User Font
Description:
Loads the font for a range of characters without changing the cell height and cursor size. If the cell height needs to be
changed, use Subfunction 10h to adjust the CRTC values. Eight different font blocks can be loaded, but only two can
be displayed at any one time. The pointer to the font points to character 0 even if the starting character is non-zero.
Passed:
Parameter
Description
AH
11h
AL
00h
BH
Number of bytes per character (character height)
BL
Font block
CX
Number of characters to load
DX
Starting character
ES:BP
Pointer to font
Returns:
None.
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AMD Geode™ GeodeROM Functional Specification