This is a very exciting idea! ppspp"N3DSll"

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I doubt the 3DS processor is fast enough. It's a 268 MHz ARM11 MPCore quad core (with only 3 cores usable for games)

which is a lot slower than the Raspberry Pi 2 and people have reported that the Raspberry Pi 2 does not get great performance out of ppsspp.

However, the'n3ds' screen resolution is very low, (400*240).
Stereoscopic 3D (800*240)