Game Boy Advance link-cable mod lets original hardware control Switch games

A Game Boy Advance link cable has been turned into a living controller path for the Nintendo Switch, letting original handheld hardware steer compatible Switch software, including Nintendo Switch Online GBA titles and even Pokémon FireRed and LeafGreen. For retro players, the payoff is immediate: the old console in your hands is not just a prop, but a usable input device in the modern emulation stack.

The mod came from Robert Dale Smith and routes the cable through a pico adapter in the middle, with a small multiboot ROM handling the communication layer. The Switch sees the Game Boy Advance as a generic controller, while the original handheld and the console exchange data in both directions. That two-way link is what makes the project feel bigger than a one-off stunt, because it leaves room for software ideas such as Pokémon trading between devices if the right support is written.

Nintendo has already spent years chasing some of the same design goals. Its Game Boy Advance library on Switch Online arrived in February 2023 through Nintendo Switch Online + Expansion Pack, and Nintendo European Research & Development said the emulator was built in-house with special care taken to reproduce Link Cable play for up to four-player multiplayer. Nintendo’s official GBA Classics page also lists rewind in single-player mode and online play for 2 to 4 players depending on the game. In other words, Smith’s mod does not fight the platform direction so much as push it one step further toward the old physical rituals of the series.

That physical side matters. Nintendo’s accessory history says the Game Boy Advance Link Cable could connect one, two or three other Game Boy Advance systems, and the broader Game Link Cable lineage goes back to the original Game Boy in 1989. The project echoes that history of heads-up, cable-first multiplayer, the same culture that once tied handhelds together for GameCube-era play in The Wind Waker and Four Swords Adventures.

Smith is hardly a casual tinkerer. His Controller Adapter brand says it has shipped thousands of custom controller adapters worldwide, and its product pages show work spanning console-to-controller adapters for systems like GameCube, PC Engine or TurboGrafx-16, and 3DO. He is already thinking about a Dreamcast version, including a small screen for VMU information. Taken together, the mod feels less like nostalgia cosplay and more like a preservation-minded input experiment, one that lets original hardware keep doing exactly what made it special in the first place.