Having spent 2 years programming the 65816, believe me you DON'T want to play with a 16 bit 6502!!!! The memories, the memories.... There was a processor dog if ever I saw one. Interpretation of opcodes was dependant on the mode the processor was set to, and so if you branched to a section of code when you were in the wrong mode, results were... screwy. All sorts of wierd and wonderful things when you switched modes; for example switching from 16 bit accumulator to 8 bit cleared the high byte, but switching the index registers the same.... didn't. It was a very painful time in my life :) A