A video I uploaded to show how simple this works. I show what you need, it's menu, controls and that you can even copy it to another memory card.
I have put together a few of these hacks to sell at GAMESWAP. All you need is a copy of The Legend of Zelda The Wind Waker to boot the hack. I've done so 'cos you can always find the GameBoy Player hardware, but never the start-up disc software needed to use it. It's not the official GameBoy Player software on the disc, of course...but some enthusiasts argue this simplified software scales better, has a cleaner image and is easier to use than the real thing. Since it's not official or collectible, we have priced it accordingly.