LODS - Load String (Byte, Word or Double)

        Usage:  LODS    src
                LODSB
                LODSW
                LODSD  (386+)
        Modifies flags: None

        Transfers string element addressed by DS:SI (even if an operand is
        supplied) to the accumulator.   SI is incremented based on the size
        of the operand or based on the instruction used.  If the Direction
        Flag is set SI is decremented, if the Direction Flag is clear SI
        is incremented.  Use with REP prefixes.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        src             12/16   5     5     5             1


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