INT 10,F - Get Video State

AH = 0F

on return:

AH = number of screen columns

AL = mode currently set (see ~VIDEO MODES~)

BH = current display page

- video modes greater than 13h on EGA, MCGA and VGA indicate

~INT 10,0~ was called with the high bit of the mode (AL) set

to 1, meaning the display does not need cleared

- function returns byte value at 40:49; On EGA, MCGA and

VGA bit 7 of register AL is determined by bit 7 of BIOS Data

Area byte 40:87. This bit is usually set by INT 10,0

with bit 7 of the requested mode (in AL) set to 1