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INT 2F - AD-DOS - INSTALLATION CHECK
        AX = 0C00h
Return: AL = FF if installed
            BX = 4144H  ('AD')
            CX = 2D44H  ('-D')
            DX = 4F53H  ('OS')
Notes:  AD-DOS is the DOS version of the After Dark screen blanker for
          MS Windows
        AH=0Ch is the default multiplex number (there is one report of a
          version with AH=C0h as default)

See Also: 2F0C01
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