Int 10 Fn 6F06 - Video - Video7 VGA,vega Vga - Select Autoswitch Mode [V] AX = 6F06h BL = Autoswitch mode select 00h select EGA/VGA-only modes 01h select Autoswitched VGA/EGA/CGA/MGA modes 02h select 'bootup' CGA/MGA modes BH = enable/disable (00h enable, 01h = disable selection)