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If anyone is interested the same was achieved with Ocarina Of Time almost 2 years ago. A fully matching decompiled C version from the assembly

https://arstechnica.com/gaming/2021/11/reverse-engineering-t...

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That's different though. OoT was decompiled while this is a reimplementation (since there never was a C source for ALttP to begin with).

OP's reimplementation cites this disassembly of the Japanese version: https://github.com/spannerisms/jpdasm

Which cites and is modeled on MathOnNapkins's disassembly of the US version: https://www.zeldix.net/t143-disassembly-zelda-docs, https://www.romhacking.net/forum/index.php?topic=13592.0

I'm a little confused what precisely is this?

Oot seems to be clear it's decompiled the ROM and can deterministically make a ROM that runs on the hardware and emulator.

I thought it was a modern reimplementation but it seems to use parts of a SNES emulator.

And seems to run standalone but with parts of SNES hardware there too... Perhaps that made reusing assets easier than converting them. And translating graphics easier to.

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