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(nasm.info)Section B.4.76

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B.4.76. `FxDISI', `FxENI': Disable and Enable Floating-Point Interrupts
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     FDISI                         ; 9B DB E1             [8086,FPU]
     FNDISI                        ; DB E1                [8086,FPU]

     FENI                          ; 9B DB E0             [8086,FPU]
     FNENI                         ; DB E0                [8086,FPU]

   `FDISI' and `FENI' disable and enable floating-point interrupts.
These instructions are only meaningful on original 8087 processors: the
287 and above treat them as no-operation instructions.

   `FNDISI' and `FNENI' do the same thing as `FDISI' and `FENI'
respectively, but without waiting for the floating-point processor to
finish what it was doing first.