American Megatrends Super Voyager LPX, User Manual

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Super Voyager LPX ISA Motherboard User's Guide
VGA BIOS INT 10h Inquiry Functions
, Continued
Function 12h Subfunction A2h Set Monitor Type (Horizontal)
This function sets the monitor type horizontal timings. The monitor type
information is used by the VGA BIOS to select the optimal display
timings for extended modes. The current monitor type can be read using
INT 10h function 12h subfunction 9Ah.
Input: AH = 12h
BL = A2h Set monitor type
AL = Monitor type to set
00h VGA 31.5 KHz
01h 8514-compatible 31.5 KHz and 35.5 KHz
02h SVGA 31.5 KHz to 35.1 KHz
03h Extended SVGA 31.5 KHz to 35.5 KHz
04h Multifrequency 31.5 KHz to 37.8 KHz
05h Extended multifrequency 31.5 KHz to 48 KHz
06h Super multifrequency 31.5 KHz to 56.0 KHz
07h Extended super multifrequency 31.5 KHz to 64.0
KHz
Output: None
Function 12h Subfunction A3h Set Refresh Type
Toggles the VGA refresh rate between normal vertical refresh and high
vertical refresh for flicker reduction. The current refresh can be read
using INT 10h function 12h subfunction 9Ah.
Input: AH = 12h
BL = A3h Set High/Low VGA refresh
AL = Enable/Disable
01h Enable high refresh
00h Use normal VGA refresh
Output: None