Int 10/AH=12h/BL=30h

AH = 12h
BL = 30h
AL = vertical resolution
00h 200 scan lines
01h 350 scan lines
02h 400 scan lines

Return:
AL = 12h if function supported

Desc: Specify the number of scan lines used to display text modes

Note: The specified resolution will take effect on the next mode set

See Also: AH=00h

Category: Video - Int 10h - V