Specifications

AMD Geode™ GeodeROM Functional Specification 175
Video BIOS Support
32087C
13.1.17.6 Subfunction 08h: Read Overscan Register
Description:
Returns the current value of the Overscan register. Overscan is the small border around the edge of the screen
between display end and blank start.
Passed:
Returns:
13.1.17.7 Subfunction 09h: Read All Palette and Overscan Registers
Description:
Returns all 16 internal palette registers as well as the Overscan register into a buffer pointed to by ES:DX. The first 16
bytes of the buffer contain the Palette registers (Index 00h-0Fh) and the last byte contains the Overscan register.
Passed:
Returns:
None.
13.1.17.8 Subfunction 10h: Read Individual RAMDAC Register
Description:
Sets a specified, individual RAMDAC register to the given R, G, B value. Each of the 256 RAMDAC locations contain
three 6-bit values for red, green, blue. Values above 3Fh are truncated (masked).
Passed:
Returns:
None.
Parameter Description
AH 10h
AL 08h
Parameter Description
BH Value read
Parameter Description
AH 10h
AL 09h
ES:DX Pointer to 17 byte table for return data:
Byte[16] = Overscan
Bytes[15:0] = Palette
Parameter Description
AH 10h
AL 10h
BX Index
CH Green value
CL Blue value
DH Red value