Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
FSTSW Instruction
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────────────────┬─────────────────────────┬─────────────────────────────────
 FSTSW mem16    │ fstsw  statword         │  87 12-18
 FNSTSW mem16   │                         │ 287 12-18
                │                         │ 387 15
                │                         │ 486 3
────────────────┼─────────────────────────┼─────────────────────────────────
 FSTSW AX       │ fstsw  ax               │  87 ──
 FNSTSW AX      │                         │ 287 10-16
                │                         │ 387 13
                │                         │ 486 3
────────────────┴─────────────────────────┴─────────────────────────────────
 
  NOTE: The timings reflect the no-wait version of the instruction.
        The wait version may take additional clock cycles.
                                    -♦-