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User talk:EdK: Difference between revisions
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It has been several decades, but I remember needing to relearn some stuff when I moved from 6800 to 6502. Of course not as much as I had to relearn when moving from 6502 to 8080.
After some research I see the confusion. Quoting from Wikipedia:
<blockquote>
At MOS, they quickly designed the 6501, a completely new processor that was pin-compatible with the 6800. This allowed it to be plugged into motherboards designed for the Motorola processor, although its instruction set was different. Motorola sued immediately, and MOS agreed to stop producing the 6501 and went back to the drawing board. The result was the "lawsuit-compatible" 6502, which was by design unusable in a 6800 motherboard but otherwise identical to the 6501. Motorola had no objection. [[wp:MOS_Technology_6502|MOS Technology 6502]]
</blockquote>
So my memory is correct the instructions sets are different.[[User:EdK]]
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