Int 21 Fn 4407  - DOS 2+ - Ioctl - Get Output Status                       [D]

   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

See Also: AX=4406h,INT 2F/AX=122Bh