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(nasm.info)Section B.4.104

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B.4.104. `FSTENV': Store Floating-Point Environment
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     FSTENV mem                    ; 9B D9 /6             [8086,FPU]
     FNSTENV mem                   ; D9 /6                [8086,FPU]

   `FSTENV' stores the `FPU' operating environment (control word,
status word, tag word, instruction pointer, data pointer and last
opcode) into memory. The memory area is 14 or 28 bytes long, depending
on the CPU mode at the time. See also `FLDENV' (*Note Section B.4.91::).

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