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you could just go to nintendo.com and go the ds page, it specifically says that the ds will not play GB and GBC games, only GBA (but it also says that the GBA slot could be used as memory and hardware expansion!) ooooh...
Are you sure about that? I just checked, and all I could find was:
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Dual Slots: Nintendo DS makes a vast library of Game Boy® Advance games readily available. Developers could find ways to make new connections between GBA games and DS games. The GBA port could be used for new hardware, enormously expanding the functional expandability of the DS.
Here's what I understand about why this entire subject has come up.
The GameBoy Color "emulated" B&W GameBoy games, and added a special Metroid-designed color scheme to them.
The GameBoy Advance perfectly re-creates the GBC experience, by having actual GBC hardware included in the GBA, automatically triggered by a small switch in the cart slot that only comes in contract with GB/GBC games.
Now, we already know that the DS has an ARM9 CPU for it's primary strength, and that it includes an ARM7 CPU (the same as the GBA) for GBA-compatibility, and to run it's second screen independantly of what's going on with the first.
But is there
just the ARM9 and ARM7 in there, or did they include the GBC's CPU as well? It's possible that Nintendo decided the GB and GBC aren't worth hanging onto anymore.
AFAIK (and I admit that I'm no techie), some GBA games actually did use the GBC's CPU. Like, do you remember how the first GBA Castlevania had great (for the GBA) sound? And then for the second one, the sound was pretty crappy, because Konami decided it was a good "tradeoff" for more powerful graphics in the second game?
Well, as I've heard it, the GBA has no "sound processor". So the first Castlevania ran everything off the main CPU. But for the second game, they decided to use the included GBC CPU as a makeshift "sound processor", so that the GBA's main CPU could focus on other things.
If there is no GBC CPU in the "GBA part" of the DS, then (assuming what I've heard is true) the second GBA Castlevania wouldn't be able to function properly in the DS (or at least it's sound wouldn't work).
Edit: "Whatcu talkin' bout Willis?" used to be the catch phrase of Gary Coleman ("that little black midget security-guard guy") back when he was on the 80's sitcom "Different Strokes" (playing a kid from Harlem who got adopted along with his older brother "Willis" by a rich old white guy).