The complete source code for the Super Nintendo Entertainment System (SNES) version of Doom has been released on archive.org. Although some of the code was partially released a few years ago, this is the first time the full source code has been made publicly available.
↫ Shaun James at GBAtemp
The code was very close to being lost forever, down to a corrupted disk that had to be fixed. It’s crazy how much valuable, historically relevant code we’re just letting rot away for no reason.