mov dx,3CCh
        in  al,dx
        and al,0F3h
        mov dx,3C2h
        out dx,al

        mov dx,3C4h
        mov ax,100h
        out dx,ax

        mov al,1
        out dx,al
        inc dx
        in  al,dx
        or  al,1
        out dx,al

        dec dx
        mov ax,300h
        out dx,ax

        mov dx,3DAh
        in  al,dx
        mov dx,3C0h
        mov al,33h
        out dx,al
        mov al,0
        out dx,al