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 #01680 at AH=59h/BX=0000h) Notes: for DOS 2+, files are always ready for output, even if the disk is full or no media is in the drive this function was not supported by Digital Research's DOS Plus SeeAlso: AX=4406h,INT 2F/AX=122Bh