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

214407 - DOS 2+ - IOCTL - GET OUTPUT STATUS