LOOP - Decrement CX and Loop if CX Not Zero

        Usage:  LOOP    label
        Modifies flags: None

        Decrements CX by 1 and transfers control to label if CX is not
        Zero.  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      18   8+m  11+m    6             2
                no jump    5    4     ?     2



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