Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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FSTSW Instruction
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  Title:    Store Status Word
 
  Syntax:   FSTSW dest
            FNSTSW dest
 
  Description:
 
     Stores the status word to a specified 16-bit memory operand. On
     the 80287, 80387, and 80486, the status word can also be stored to
     the processor's AX register.
 
     FSTSW has wait and no-wait versions. The wait version (FSTSW)
     checks for unmasked numeric errors; the no-wait version (FNSTSW)
     does not. When the .8087 directive is used, the assembler puts the
     WAIT instruction before the wait version and the NOP instruction
     before the no-wait version.
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