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6502 has three 8 bit registers, A, X and Y. X and Y are used for indirect addressing and the like. MIPS has 32 32bit registers, or 64bit and maybe floats and doubles, and you can use any of them for anything. 68k is more like a bigger 6502 than a MIPS. Personally I prefer programming a RISC chip (like the MIPS or an ARM), but the choice to make is more around the complexity of the other hardware, than the CPU itself. For assembly, the Nintendo 64 was the sweet spot, IMHO, as it was the last one where we ran as the kernel and could do anything.





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