A few years ago, I got the crazy idea to try porting the Commodore 64 KERNAL and BASIC ROMs to the NES, since their CPUs are mostly the same. But I gave up when things got complicated with the PPU. Then a couple weeks ago, I saw that someone ported it to
the Atari 1200XL, so I decided I';d give it another shot. This time, I was able to make a (mostly) working system.
Quite impressive.
https://www.osnews.com/story/134573/nes-64-commodore-64-kernal-and-basic-port/
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