Originally posted by Akira
That will barely suffice to emulate all the other stuff... The GBA is not just a CPU, just because they share the same CPU doesn't mean that the emulation will be almost native, the GBA has other things that the GP32 will have to emulate.
That's as saying that a 68030 50Mhz Amiga running Fusion will perform as a 68030 50Mhz based Macintosh.
Yes of course the GP32 would need to emulate the graphics of the GBA. But that would where the GP32 extra CPU hoursepower comes into it!
I think that it may well be possible to do, you need to look at MAC emulation on Amiga for an example of this.