> Could someone describe the 'lds' function to me, or atleast quote
> the code i posted (the 'lds' parts of it) so that i could better
> understand it. I think i've gotten the idea of it, but i'm not sure.
> So far i think it does the following:
> 
> mov ds,100
> mov ax,102        ;add 2 to the number put into dx
But remember MOV uses DS as a segment pointer, here you've changed DS
first and therefore loaded AX from a new location...  
Use segment overrides to force things:
                        mov ax,cs:[100h]
                        mov ds,ax
                        mov ax,cs:[102h]
This should be equal to  lds ax,cs:[100h].  I hope.  ;-) 
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