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INT 21 - DOS 2+ - IOCTL - GET OUTPUT STATUS
        AX = 4407h
        BX = file handle
Return: CF clear if successful
            AL = input status
                00h not ready
                FFh ready
        CF set on error
            AX = error code (01h,05h,06h,0Dh) (see AH=59h)
Note:   for DOS 2+, files are always ready for output, even if the disk is
          full or no media is in the drive
SeeAlso: INT 2F/AX=122Bh

See Also: 214406
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