Specifications

170 AMD Geode™ GeodeROM Functional Specification
Video BIOS Support
32087C
13.1.10 Function 09h - Write Character and Attribute
Description:
Writes a character with a given attribute at the location specified by the current cursor position. In graphics mode, the
attribute is actually the foreground color (background is always black). Also in graphics modes, if bit 7 of BL is set to a
“1”, then the character is XORed into memory.
The number of characters written (specified by CX) should not exceed the screen length. No error checking or clipping
is provided by the BIOS on this value.
Passed:
Returns:
None.
13.1.11 Function 0Ah - Write Character
Description:
Writes a character only (not the attribute) at the location specified by the current cursor position. In graphics mode, this
function actually maps to Function 09h and therefore requires the foreground color information. Just like Function 09h,
in graphics modes, if bit 7 of BL is set to a “1”, then the character is XORed into memory.
The number of characters written (specified by CX) should not exceed the screen length. No error checking or clipping
is provided by the BIOS on this value.
Passed:
Returns:
None.
Parameter Description
AH 09h
DS Seg0
AL Character to write
AH Attribute of character
BH Display page to write to
CX Number of times to write character
Parameter Description
AH 0Ah
DS Seg0
AL Character to write
BL Graphics mode: character color (if bit 7=1: XOR char)
BH Display page to write to
CX Number of times to write character