Specifications

AMD Geode™ GeodeROM Functional Specification 199
Video BIOS Support
32087C
13.2.8 Function 07h: VBE Set/Get Display Start
The subfunctions either set the display start to a specific pixel location (Set Display Start) or return the current starting
address (Get Display Start). When setting the display start address, it is possible that all pixel positions are not available. In
this case, the functions will fail and the display start will not change.
13.2.8.1 Subfunction 00h: Set Display Start
Passed:
Returns:
13.2.8.2 Subfunction 01h: Get Display Start
Passed:
Returns:
13.2.8.3 Subfunction 80h: Set Display Start during Vertical Retrace
Passed:
Parameter Description
AH 4Fh
AL 07h
BH Reserved and set to 00h
BL 00h
CX First display pixel in line
DX First displayed scan line
Parameter Description
AX VBE return status
Parameter Description
AH 4Fh
AL 07h
BH Reserved and set to 00h
BL 01h
Parameter Description
AX VBE return status
BH Reserved and set to 00h
CX First displayed pixel in line
DX First displayed scan line
Parameter Description
AH 4Fh
AL 07h
BH Reserved and set to 00h
BL 80h
CX First display pixel in line
DX First displayed scan line