– A classic Game Boy Advance, its link cable, and a small adapter can be repurposed to function as a Nintendo Switch controller via a microcontroller and open-source firmware.
– The GBA acts as a USB controller; two-way communication with the Pico adapter enables Switch input in Switch USB mode, with potential for further software integration on the Switch.
– Open-source Joypad OS firmware powers the setup, aiming for broad compatibility (PC, PS3, Xbox 360, Switch, and more) with minimal hardware cost.
Modder Converts a GBA into a Nintendo Switch Controller
Tinkerer and modder Robert Dale Smith has figured out how to use a classic Game Boy Advance, its old proprietary link cable, and a bit of jerry-rigging to turn it into a controller for the Nintendo Switch. The feat was shared on X recently, where a demo showed Nintendo Switch Online gameplay using the original GBA to control emulated GBA titles and even physical copies of Pokémon FireRed and LeafGreen. The write-up, as described, keeps the emphasis on the cleverness of the setup and the nostalgia that fuels it.
What Makes This Setup Work
Smith explains that from the console’s point of view, the GBA acts as a generic Switch controller, with two-way communication via a Pico adapter placed in the middle. The concept hinges on the GBA link cable being able to sideload a small multiboot ROM into memory and run it. This enables a bridge between the devices, allowing input signals to be transmitted as needed. The hardware side stays compact, with the adapter signaling Switch USB mode when the console powers the setup, which is the core of the integration.
Detailed Mechanism and Potential
In his own words, Smith notes that further opportunities could open if Nintendo software supports enhanced communication. The idea is that with proper patches, more complex interactions could be achieved. The firmware, described as open-source, is already in place, and the hardware cost is kept to a minimum, described as “a few bucks.” The possibility of a software patch on the Switch to bridge any remaining gaps is suggested, making this more than a novelty and a plausible path to broader compatibility.
A Nod to Couch-Coop Classics
The project nods to couch-co-op vibes from games like The Legend of Zelda: The Wind Waker, where the GBA could serve as a second screen or as an extra player device. Beyond nostalgia, the mod demonstrates the practical reality of linking a GBA via a cable to the Switch, even with some wires and a microcontroller involved. The overall impression is that of a clever reuse of existing tech to expand controller options for the Switch.
Open-Source Tools and Compatibility
Smith relied on his Joypad OS firmware, an open-source solution that enables the GBA to function as a USB controller compatible with multiple platforms, including PC, PS3, Xbox 360, and more. The approach showcases how a classic handheld can be repurposed through software and modest hardware adaptations to interface with modern gaming systems. The broader takeaway is the potential for similar projects that leverage open-source firmware to broaden device interoperability.