INT 49 - MAGic v1.16+ - TURN ON MAGNIFICATION
        AX = 0001h
Return: AX = status
            0000h cannot magnify current video mode
            0002h magnified (text mode)
            0003h magnified (graphics mode)
            FFFDh function works only in magnified mode
            FFFFh MAGic busy, retry later
        BX,CX,DX destroyed
Notes:  MAGic (MAGnification In Color) is a TSR by Microsystems Software, Inc.
          providing 2x2 text and graphics magnification on VGA, XGA, and SVGA
        INT 49 is the default, but may be overridden on the commandline.  The
          actual interrupt in use may be found by searching for the signature
          "MAGic" or "xMAGic" (for the deluxe version) immediately preceding
          the interrupt handler (this is also the installation check).  MAGic
          uses CodeRunneR, which places the signature "RT" at offset 0000h in
          the interrupt handler's segment, followed by MAGic's TSR ID of
          "VMAG".
SeeAlso: AX=0003h,AX=0004h,AX=0008h