This does not include the Game Boy Color. For this console, see Nintendo Game Boy Color.

you can edit the files on the RAM filesystem

A Japanese-originated operating system that is undergoing recent development. Appears to have a modicum of features, including a GUI, CPU access, and more. It’s even available on a physical cartridge.

http://yuma.ohgami.jp/ (creator page)

https://github.com/cupnes/sh_gbos

https://yohgami.booth.pm/items/2636771 (ROM download)

https://akiba-pc.watch.impress.co.jp/docs/wakiba/find/1308961.html (physical proof)

Regarding the gameboy: it will be tricky

Mere postulation, but it’s possible.

https://github.com/hsoft/collapseos/issues/67

Compatible on the Game Boy, but has superior function on the Game Boy Color. For this, see Nintendo Game Boy Color.

approximating an operating system

Homebrewed basic OS project with some basic functionality.

https://github.com/ekimekim/gbos

a task scheduler written entirely in C

Extremely basic OS meant more for learning purposes than anything.

https://www.cs.ucr.edu/~vahid/rios/

https://github.com/dumbanode/RIOSforGameboy

Thought as lost for years, but combined with a recently leaked ROM, the WorkBoy’s quite detailed PDA abilities have finally been unearthed. If the keyboard is required to make it work, this will need to be emulated or imitated…

https://www.youtube.com/watch?v=SZcrPM-jDqY

Compatible on the Game Boy, but has superior function on the Game Boy Color. For this, see Nintendo Game Boy Color.

Compatible on the Game Boy, but has superior function on the Game Boy Color. For this, see Nintendo Game Boy Color.