INT 61 - OPTIMA 1024 VGA-Sync - ENTER SPECIFY MODE
        AX = 0004h
Note:   Specify Mode is enabled by hot key (seeAlso below), and allows
        panning and zooming via the numeric keypad.
        INT 61h is the default interrupt; the actual interrupt number can be
          obtained by calling INT 16/AH=FFh
        The Zoom interrupt no. can be obtained with function INT 16h,AH=0FFh
SeeAlso: INT 61/AX=0000h"OPTIMA",INT 61/AX=0007h"OPTIMA"