Device Request 0bH: Output Flush

                                                                      ◄Chr► 
 This tells the driver to terminate any write operation in progress and to
 empty the device output buffer.

DevReq0bRec
  Offset Size Contents
  ▀▀▀▀▀▀ ▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
   +0      1  bLen         0dH (length of this request packet)
   +1      1  bUnitNo      (not used)
   +2      1  bCmd         0bH (command code)
   +3      2  rStatus      OUTPUT: Device Status Word must fill before exit
   +5H     8  res          (reserved)
          13               size of this structure

     rStatus  On exit, the driver must place a DevStatusWord here.  Always
              set the Done bit (bit 8).  On an error, set the Done bit and
              the Error bit (bit 15) and put a Device Error Code in the low
              byte.

   Notes: ■ This is the device driver "catch-point" when a device file such
            as PRN is closed via fn 3eH (close file).

See Also: Device Requests
          DevRequestHdrRec
          Installable Device Drivers
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