SECTION 6
Conversions and Interfaces
6-48 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
INT 10h, Function AH = 12h, BL = 30h: Set Scan Lines
BIOS
Selects the number of scan lines for text modes. Selected value effective when
performing set display mode function.
On Entry:
AH = 12h
BL = 30h
AL = 0 = 200 scan lines
1 = 350 scan lines
2 = 400 scan lines
On Return:
AL = 12h = VGA active
00h = VGA not active
INT 10h, Function AH = 12h, BL = 31h: Enable/Disable Default Palette Loading
BIOS
On Entry:
AH = 12h
BL = 31h
AL = 0 = Enable default palette loading
1 = Disable default palette loading
On Return:
AL = 12h = Function supported
INT 10h, Function AH = 12h, BL = 32h: Enable/Disable Video
BIOS
Disables or enables CPU access to the video adapter's I/O ports and refresh
buffer. The display is turned off or on.
On Entry:
AH = 12h
BL = 32h
AL = 0 = Enable video
1 = Disable video
On Return:
AL = 12h = Function supported
INT 10h, Function AH = 12h, BL = 33h: Enable/Disable Gray Scale Summing
BIOS
Enables or disables grayĆscale summing.
On Entry:
AH = 12h
BL = 33h
AL = 0 = Enable gray scale summing
1 = Disable gray scale summing
On Return:
AL = 12h = Function supported
6. Conversions and
Interfaces
