Specifications

178 AMD Geode™ GeodeROM Functional Specification
Video BIOS Support
32087C
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:
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:
Returns:
None.
Parameter Description
AH 10h
AL 1Bh
BX Starting index
CX Number of registers to sum
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