WAIT/FWAIT - Event Wait

        Usage:  WAIT
        Modifies flags: None

        CPU enters wait state until the coprocessor signals it has finished
        its operation.  This instruction is used to prevent the CPU from
        accessing memory that may be temporarily in use by the coprocessor.
        WAIT and FWAIT are identical.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              4     3     6+   1-3            1

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