6502 traces of 6501
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The 6501 was the original product from MOS Technology (who, as a team, had recently left Motorola where they worked on the 6800.) It was pin-compatible but not code-compatible, and was withdrawn in a deal which left MOS free to sell the 6502 (even though it has many resemblances to the 6800)
There are several places on the NMOS 6502 where the layout shows the history: it is a modified 6501 and not an independent design.
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