I might put out my photos of it.
Someon changed separate z80 CPU to integrated 6502 CPU. Now, I think that it is a z80 CPU, same as on Game Boy, different to SNES (which was 6502!). I don't care to speculate as to whether the CPU is on the same die as the ARM or not, but if I had to guess then on the same die seems very plausible. Will try and find some evidence. --
drj Definitely Z80.
According to official programming manual, "integral 8 bit CISC CPU for compatibility". In context it seemed to say that the CPU was integrated, and the ARM in it *is* a custom chip for nintendo, but now it implies to me its integrated into the "system". I swear I read this somewhere else too, but for right now its too ambiguous so I'll take it out. (the block diagram doesn't show it as integrated either).
BTW, I was thinking original GB when I said 6502, however, aren't they about the same pinout? technically the GBC CPU is a z80 "clone", of which 6502 and LR35902 are family members? I seem to recall certain variant instructions being unsupported in the GB because of this. (maybe this topic can flesh out the GBC entry.
Game Boy and Game Boy Color use a Z80 clone. Few people care about it being a clone. Anyway most decent clones are in fact licensed designs from Zilog. 4MHz for the Game Boy, 8 MHz for the Game Boy Color (running at 4 MHz when playing grey Game Boy carts).
The 6502 is a different beast altogether. It is an 8 bit CPU, but totally incompatible with the z80. --drj
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