LOOPNZ/LOOPNE - Loop While Not Zero / Loop While Not Equal

        Usage:  LOOPNZ  label
                LOOPNE  label
        Modifies flags: None

        Decrements CX by 1 (without modifying the flags) and transfers
        control to label if CX != 0 and the Zero Flag is clear.  The
        label operand must be within -128 or 127 bytes of the instruction
        following the loop instruction.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        label:  jump      19   8+m  11+m    9             2
                no jump    5    4     ?     6


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