Aaeon PCM-4330 Instructions Manual page 103

These calls are spedtic to the WD-BIOS.
The following lists functions that are supported by the WD-BIOS with call
and return codes.
AX = 7F7Fh BH = 00h
AX = 7F7Fh BH = 01h
AX = 7F7Fh BH = 02h
CH=
CL=
AX = 7F7Fh BH = 03h
BL=
AX = 7F7Fh BH = 04h
AX = 7F7Fh BH = 05h
AX = 7F7Fh BH = 06h
AX = 7F7Fh BH = 07h
AX = 7F7Fh BH = 08h
BL=
AX = 7F7Fh BH = 22h
BL=
AX = 7F7Fh BH = 23h
BL=
AX = 7F7Fh BX = 4100h
AX = 7F7Fh BX = 4101h
AX = 7F7Fh BX = 4102h
set non-VGA mode
set VGA mode
read spedtic status information
number of available 64 KB blocks of screen memory
number of used blocks
disable current VGA mode
enable/disable current VGA mode
set non-VGA MDA (monochrome) mode
set non-VGA CGA (color) mode
set VGA monochrome mode
set VGA color mode
disable RAMDAC
enable/disable RAMDAC
read BitBLT scroll status information
hardware BitBLT or software scroll-function
0: hardware BitBLT scroll-function
1: software scroll-function
set BitBLT scroll-function
0: hardware BitBLT scroll-function
1: software scroll-function
enable LCD- and CRT-monitor
enable or disable auto-centering
This function is not available if vertical expansion
is actived.
toggle vertical expansion
This function is available for video modes 3+ and
7+ only.