MOVZX - Move with Zero Extend (386+)

        Usage:  MOVZX   dest,src
        Modifies flags: None

        Copies the value of the source operand to the destination register
        with the zeroes extended.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg,reg           -     -     3     3             3
        reg,mem           -     -     6     3            3-7


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