This tells the driver to return its output status; in particular, to
indicate whether an output request can be satisfied without waiting.

DevReq0aRec
Offset Size Contents
                                                                          
+0      1  bLen         0dH (length of this request packet)
+1      1  bUnitNo      (not used)
+2      1  bCmd         0aH (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).

If the driver is unable to accept any additional characters,
set the Busy bit (bit 9).  Otherwise, clear bit 9 to indicate
that a call to DvRq 08H will be satisfied without waiting.

Notes:   Output devices can be optimized by processing DvRq 10H (output
until busy).

See Also: Device Requests
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Device Request 0aH: Output Status