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MrCalcWatch is what I like to call a dark-matter-programmer™. They don't shine at you all day, you never see them anywhere online, you don't know their names, nor do you hear anything about them.

But if you ever get close, they develop a tremendous gravitational pull! ◼️

And the following has gravity, even if it might be seen as very nerdy. In the original forum post, MrCalcWatch describes how he ported the C64 Kernal and BASIC ROM to the NES.

In principle an obvious idea, both systems use 6502 derivatives as CPU, but the architecture and memory map is quite different. All the more astonishing that the feat was actually accomplished!

There is a short article about it on hackster.io and if you want to see the whole thing in action on an emulator, you can find 4 short demo videos there.

Some people just have too much free time. 🤓 But well done!