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(nasm.info)Section B.4.103

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B.4.103. `FSTCW': Store Floating-Point Control Word
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     FSTCW mem16                   ; 9B D9 /7             [8086,FPU]
     FNSTCW mem16                  ; D9 /7                [8086,FPU]

   `FSTCW' stores the `FPU' control word (governing things like the
rounding mode, the precision, and the exception masks) into a 2-byte
memory area. See also `FLDCW' (*Note Section B.4.90::).

   `FNSTCW' does the same thing as `FSTCW', without first waiting for
pending floating-point exceptions to clear.