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Salnax said:

Assorted Thoughts

  • The GBA is the odd man out, but I thought that the ARM7 CPU was familiar. Sure enough, it's the same CPU that appears as the second CPU in the DS, and also serves as the Dreamcast's Sound Processor. Neat.

That was a common thing for Nintendo hand helds. The second cpu in the gameboy advance was the main processor of the Gameboy/color. The second cpu on the ds was the main cpu on the GBA. The second cpu on the 3ds is the main one of the DS. It is done mainly for backwards compatibility.