There is a custom BIOS from Cult-of-GBA [https://github.com/Cult-of-GBA/BIOS](https://github.com/Cult-of-GBA/BIOS) _A Game Boy Advance replacement BIOS. Written completely in ARM assembly from scratch._
There is a custom BIOS from Cult-of-GBA https://github.com/Cult-of-GBA/BIOS
A Game Boy Advance replacement BIOS. Written completely in ARM assembly from scratch.