The Game Boy Advance (GBA) link cable is the third generation of this feature which originated with the Gameboy. It not only allows for peripherals to be connected, but also for multiplayer between GBAs – even with just one game copy – and item sharing and unlocking of features in specific games. This makes it an interesting feature to support in today’s homebrew GBA games and applications, made easy by libraries such as [Rodrigo Alfonso]’s gba-link-connection.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/02/29/easily-add-link-cable-support-to-your-homebrew-gba-game/