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FNSTSW Store Status Word (No-wait) Exception Flags: None
FNSTSW memory location
Logic: [memory location] . status word
FNSTSW is the no-wait form of FSTSW. It stores the current value of the
status word to a 16-bit memory location. In the 80287 and 80387, you can
store the status word directly to the AX register of the 80286 or 80386
with the instruction FNSTSW AX.
Use this instruction to poll the state of the coprocessor. You can use
FNSTSW to determine if the coprocessor is busy.
--------------------------------------------------------------------------
Operands Clocks Bytes Example
FNSTSW memory16 12-18 4 FNSTSW STAT_WORD
--------------------------------------------------------------------------
Note: You should use this no-wait form of the instruction
only when there is a danger of generating an infinite
wait condition.
See Also:
FSTSW
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