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(nasm.info)Section B.4.86

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B.4.86. `FINIT', `FNINIT': Initialise Floating-Point Unit
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     FINIT                         ; 9B DB E3             [8086,FPU]
     FNINIT                        ; DB E3                [8086,FPU]

   `FINIT' initialises the FPU to its default state. It flags all
registers as empty, without actually change their values, clears the
top of stack pointer. `FNINIT' does the same, without first waiting for
pending exceptions to clear.