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FDISI             Disable Interrupts          Exception Flags: None

FDISI

       Logic:      Interrupt Enable Mask . 1

     FDISI disables interrupts in the 8087 only. It sets the Interrupt Enable
     Mask (IEM) in the control word, which prevents the 8087 from issuing
     interrupt requests. If WAIT is decoded with pending exceptions, the 8087
     produces an input (whether masked or not).

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   Operands            Clocks         Bytes           Example
   FDISI               2-8              3             FDISI
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        Note:          The opposite instruction is FENI. The no-wait
                       version of FDISI is FNDISI.