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FSTSW             Store Status Word           Exception Flags: None

FSTSW memory location

       Logic:      [memory location] . status word

     FSTSW stores the current value of the status word to a 16-bit memory
     location. In the 80287 and 80387, you can store the status word directly
     to the AX register of the 80x86 with the instruction FSTSW AX.

  --------------------------------------------------------------------------
   Operands            Clocks         Bytes           Example
   FSTSW memory16      12-18           4              FSTSW STAT_WORD
  --------------------------------------------------------------------------

        Note:          If you use FSTSW instead of the no-wait FNSTSW form
                       and there is an outstanding unmasked exception,
                       deadlock results.