NOP - No Operation (90h)

        Usage:  NOP
        Modifies flags: None

        This is a do nothing instruction.  It results in occupation of both
        space and time and is most useful for patching code segments.
        (This is the original XCHG AL,AL instruction)

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              3     3     3     1             1

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