LDS - Load Pointer Using DS

        Usage:  LDS     dest,src
        Modifies flags: None

        Loads 32-bit pointer from memory source to destination register
        and DS.  The offset is placed in the destination register and the
        segment is placed in DS.  To use this instruction the word at the
        lower memory address must contain the offset and the word at the
        higher address must contain the segment.  This simplifies the loading
        of far pointers from the stack and the interrupt vector table.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg16,mem32     16+EA   7     7     6            2-4
        reg,mem (PM)      -     -     22    12           5-7

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