JSNES has a few games (ROMS) ported over too, included Super Mario Bros and The Legend of Zelda 2.
That’s pretty cool.
Quite a few people grew up with the Super Nintendo. Some of us even looked into going to school to code for it.
The code was a form of assembly. It wasn’t abstracted behind a layer of nice language. But I suspect that quite a few shops had kits to make development easier. Developers usually had to manipulate memory directly. They had to. They only had a few memory busses and 21MhZ to work with. No clean garbage collection for them.