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Yes, the original NES games were written in assembler. However, the source probably didn't look quite like this. I'd guess the assembler of the time didn't have as many features or things like long label names.

Here's some actual Atari 7800 (a less popular console from the same generation) code that was found on disks in a dumpster when some Atari offices closed. They both use a 6052-based CPU but have very different sound/graphics chips. I'd bet the NES code looked a lot more like this - https://github.com/OpenSourcedGames/Atari-7800

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