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(nasm.info)Section B.4.102

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B.4.102. `FST', `FSTP': Floating-Point Store
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     FST mem32                     ; D9 /2                [8086,FPU]
     FST mem64                     ; DD /2                [8086,FPU]
     FST fpureg                    ; DD D0+r              [8086,FPU]

     FSTP mem32                    ; D9 /3                [8086,FPU]
     FSTP mem64                    ; DD /3                [8086,FPU]
     FSTP mem80                    ; DB /7                [8086,FPU]
     FSTP fpureg                   ; DD D8+r              [8086,FPU]

   `FST' stores the value in `ST0' into the given memory location or
other FPU register. `FSTP' does the same, but then pops the register
stack.