Function 4407h (68-7)    IOCTL: Get Output Status

    Checks to see if the device or file is ready for output.

       On entry:      AH         44h
                      AL         07h
                      BX         Device or file handle

       Returns:
          (file)      AL         FFh     until EOF is reached
                                 00h     after EOF is reached

          (device)    AL         FFh     If device ready
                                 00h     If device not ready

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    This subfunction reports the onput status of the device or file. AL
    returns FFh for ready and 00h for not ready (or end of file).