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by ANTSANTS
4227 days ago
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An interesting related tidbit was that the BCD implementation was the only part of the 6502 that MOS patented. As you could not copyright an IC mask at the time, Nintendo/Ricoh were able to clone the 6502 without paying license fees simply by cutting the traces to that part of the chip. (Ricoh was a licensed second source for the 6502. I imagine Commodore was not happy with them after that...) |
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