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(nasm.info)Section B.4.105

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B.4.105. `FSTSW': Store Floating-Point Status Word
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     FSTSW mem16                   ; 9B DD /7             [8086,FPU]
     FSTSW AX                      ; 9B DF E0             [286,FPU]

     FNSTSW mem16                  ; DD /7                [8086,FPU]
     FNSTSW AX                     ; DF E0                [286,FPU]

   `FSTSW' stores the `FPU' status word into `AX' or into a 2- byte
memory area.

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