Hacking gba link cable adapter

Where exactly do you plan to plug the adapter into? The power port? The DS slot?

It can't be done, sorry. Some people found a few traces of the link cable on the DS motherboard, but not all, so it's not enough to get a makeshift solder job working.
 
I'd want to get a GC-GBM Link adapter or something to convert the GBM cable adapted to a GBA plug...sadly haven't found any original Nintendo GBA-GC Cables (all 3rd Party cables I found have not connected all cables necessary)
 

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