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Retrocomputing

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    @dave Yes, that came to my mind too, but the PDP-8 was different in that it had only short addresses, so you could access its zero page only with the ZP addressing mode. The 6800 is different in that the ZP addressing mode duplicates functionality of the standard absolute addressing mode, only using a one-byte operand instead of a two-byte operand.
    – cjs
    Commented Apr 20 at 4:33
  • 1
    @Raffzahn "...the Z80 isn't just taking some elements...." I didn't say "taking some," I said "extensively copying." Regardless, your statement is correct but irrelevant to the question. It may not just be taking some elements, but it is indeed "taking some elements," and thus I think serves as a suitable (and particularly obvious) example that microprocessor designers do take elements from other microprocessor designers.
    – cjs
    Commented Apr 20 at 9:00
  • 2
    Does the bus interface count? The 6501 is pin-compatible with the 6800, the 6502 rearranged.
    – Tommy
    Commented Apr 20 at 11:42
  • 13
    The “6”. They copied the “6”…
    – Jon Custer
    Commented Apr 20 at 15:26
  • 1
    @Tommy Yes, it does.
    – cjs
    Commented Apr 20 at 15:29