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    Do you mean aren't pretty similar at all? The at all at the end sort of confuses the sentence's meaning. Also, could you edit and expand upon your answer a little bit? Commented Apr 23 at 23:10
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    "Mnemonics" are not any part of a microprocessor, though.
    – dave
    Commented Apr 24 at 2:53
  • @dave Mnemonics are part of the specification, do you know an exception?
    – Polluks
    Commented Apr 24 at 16:10
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    Instructions are what a CPU executes. Mnemonics are the input language to an assembler. You can have the same mnemonics for different instruction sets; you can have different mnemonics for the same instruction set. Is the point you're making that the instruction sets are "pretty similar"?
    – dave
    Commented Apr 24 at 16:41
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    BTW, there might be something in that RTI instruction. How did it compare between the 6800 and 6809, and did any other systems do it exactly the same way? It's certainly different from the 8080, which did not push the flags automatically.
    – cjs
    Commented Apr 28 at 3:38