American Megatrends Super Voyager LPX User Manual page 119

VGA BIOS INT 10h Inquiry Functions
Function 12h Subfunction A0h Query Video Mode Availability
This subfunction returns information on the availability of a video mode.
Input: AH = 12h
AL = Video mode number (00h - 7Fh)
BL = A0h
Output: AH =
00h Video mode not supported
01h Video mode supported
DS:SI = Pointer to standard video parameters (FFFFF:FFFFh if
standard parameters undefined for this mode).
ES:DI = Pointer to supplemental video parameters (FFFF:FFFFh
if supplemental parameters undefined for this mode).
BX = Offset to the BIOS subroutine that modifies the
parameters pointed to by DS:SI. This routine requires
that ES:DI point to the proper supplemental video
parameters.
Super Voyager LPX ISA Motherboard User's Guide
, Continued