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FENI              Enable Interrupts           Exception Flags: None

FADD [[destination,] source]

       Logic:      Interrupt Enable Mask . 0

     FENI allows the 8087 only to generate interrupt requests by clearing the
     Interrupt Enable Mask in the control word. This instruction is recognized
     but ignored on later coprocessors.

  --------------------------------------------------------------------------
   Operands            Clocks         Bytes           Example
   FENI                2-8              3             FENI
  --------------------------------------------------------------------------

        Note:          The opposite instruction is FDISI, and the no-wait
                       version of FENI in FNENI.