Specifications

AMD Geode™ GeodeROM Functional Specification 179
Video BIOS Support
32087C
13.1.18.2 Subfunction 01h: Load 8x14 Font
Description:
Loads the ROM 8x14 font into the specified block. The font is loaded without changing the cell height or cursor size. If
the cell height needs to be changed, use Subfunction 11h to adjust the CRTC values. Eight different font blocks can be
loaded, but only two can be displayed at any one time.
Passed:
Returns:
None.
13.1.18.3 Subfunction 02h: Load 8x8 Font
Loads the ROM 8x8 font into the specified block. The font is loaded without changing the cell height or cursor size. If
the cell height needs to be changed, use Subfunction 12h to adjust the CRTC values. Eight different font blocks can be
loaded, but only two can be displayed at any one time.
Passed:
Returns:
None.
13.1.18.4 Subfunction 03h: Set Font Block
Specifies the font block(s) to be displayed on the screen. Eight different font blocks can be loaded, but only two can be
displayed at any one time. The two fonts displayed are defined by the bit fields passed in BL. Bits 5, 3, 2 identify the
block displayed when text attribute bit 3 is a one. Bits 4, 1, 0 identify the block displayed when text attribute bit 3 is a
zero.
Data Bit Block # Bit
D7 Unused
D6 Unused
D5 Block 0, bit 0
D4 Block 1, bit 0
D3 Block 0, bit 2
D2 Block 0, bit 1
D1 Block 1, bit 2
D0 Block 1, bit 1
Passed:
Returns:
None.
Parameter Description
AH 11h
AL 01h
BL Font block
Parameter Description
AH 11h
AL 02h
BL Font block
Parameter Description
AH 11h
AL 03h
BL Font block