Ehrm, not to be picky, but the 6502/6510/8502 has only 3 "normal"
registers; x, y and a, where x & y can be used as indexregisters, and a is
the accumulator-register.
There is an s (stack-pointer) register also, but there are only 2 operands
that modify it; txs (transfer x to s) and tsx (the other way around).
But I guess this is way off topic. I'd be VERY amazed if the kernel would
be possible to port to the 65xx processor... (Maybe the 65816?! Extended
65xx syntax, with 32-bit memory mapping)
/David Weinehall, 6510 hacker
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