A creative modding breakthrough is turning heads in the gaming community after a developer successfully converted the classic Game Boy Advance into a fully functional controller for the Nintendo Switch. The project, shared publicly by modder Robert Dale Smith, uses the original GBA link cable alongside custom firmware and a microcontroller adapter to connect the retro handheld directly to Nintendo’s modern console.
The result is more than just a novelty, as the setup allows players to control Switch games using authentic GBA hardware. According to details shared by the creator, the system even supports two-way communication, opening the door for deeper integration if further software support is developed. The reveal has quickly gained traction online, particularly among retro gaming enthusiasts who appreciate the blend of nostalgia and technical ingenuity.
How the GBA-to-Switch Controller Actually Works
At the core of this project is a clever use of the Game Boy Advance’s original link cable system. Smith paired the hardware with a Raspberry Pi Pico-based adapter and his custom-built Joypad OS firmware, which effectively tricks the Switch into recognizing the GBA as a standard USB controller. This allows the handheld to send input commands just like a traditional gamepad.
Explaining the process on X, Smith said,
“Yeah, as far as the console knows, it’s a generic Switch controller. But I do have two-way communication with the GBA on the Pico adapter in the middle.”
He further detailed that the link cable can sideload a small multiboot ROM directly into the GBA’s memory, enabling it to run custom instructions that handle input and communication.
He added,
“Then it can be configured to send and receive messages over the link cable to trigger actions.”
This setup essentially turns the GBA into a programmable controller, with the adapter acting as a bridge between generations of hardware. The simplicity of the concept, combined with its technical depth, has made it especially appealing to the DIY and modding community.
A Nostalgia-Driven Innovation With Modern Potential
While the project is undeniably a technical achievement, it is also deeply rooted in nostalgia. Smith cited his childhood experiences with the Nintendo GameCube and Game Boy Advance connectivity as a major inspiration. That era famously allowed players to use the GBA as a secondary screen or controller in select games, including titles like The Legend of Zelda: The Wind Waker.
This new mod effectively reimagines that concept for modern hardware. Instead of relying on official support, it recreates the same spirit of connectivity through independent development. The result feels like a natural evolution of Nintendo’s earlier ideas, even though it operates entirely outside official channels.
Smith also hinted at future possibilities, stating, “More would be possible if software for the Switch were to be written.” This suggests that the current version is just the beginning, with potential for expanded functionality if developers choose to build compatible applications or patches.
Open-Source Approach Keeps Costs Low and Access Wide
One of the most impressive aspects of the project is its accessibility. Smith confirmed that the hardware required for the setup costs only a few dollars, making it relatively easy for hobbyists to replicate. The Joypad OS firmware powering the system is also open-source, allowing other developers to experiment, modify, and expand on the concept.
He even extended an open invitation to Nintendo, saying,
“If Nintendo ever wants to talk, then my DMs are open. We can easily make this happen.”
While it remains unlikely that the company will officially adopt such a system, the statement highlights how polished and viable the solution has become.
Beyond the Switch, the firmware is reportedly compatible with multiple platforms, including PC, PlayStation 3, and Xbox 360. This versatility turns the Game Boy Advance into a surprisingly flexible controller option, far beyond its original design.
