I have one for my old school Gameboy Color but i dont even know what its purpose is or what to do with it haha. it has 2 prongs going in opposite diagonal directions and i dont know why...
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AC means alternating current, what you would use to light your home on the other hand DC stands for direct current. batteries require direct current.
so to answer your question an AC adapter changes the current to DC, most hand held games are operated using a battery.
so to answer your question an AC adapter changes the current to DC, most hand held games are operated using a battery.