An updated version of the trash80 ArduinoBoy MIDI adaptor for Game Boy, with a USB-C host port to plug in and power a piano keyboard.
Change the settings on any Arduinoboy variant with the free no-install Web Editor
Connect a USB MIDI keyboard right to your Game Boy without a computer in-between. Or, connect it to a computer/phone as a driver-free MIDI device. Good ol’ MIDI jacks are here too, TRS MIDI A jacks and our own patent-pending Half-DIN port for universal classic DIN compatibility.
This version even doubles as a handy USB-C to MIDI adaptor for all your MIDI gear!
Arduinoboy lets a Game Boy communicate with MIDI gear. You connect it to the Game Boy’s link port, then run one of these ROM files from a cartridge or flash cart. Different programs turn the Game Boy into different kinds of MIDI instruments and sequencers.
- mGB turns the Game Boy into a four-channel MIDI synth you can play from a keyboard or sequence externally. (Up to 3 note polyphony + 1 channel for noise)
- LSDJ is the famous tracker-style full Game Boy music workstation. Arduinoboy can sync it to MIDI clock, trigger notes and song sections, or let LSDJ control other MIDI gear. This is the original inspiration behind the Dirtywave M8.
- Nanoloop is another Game Boy sequencer that can sync with the rest of a MIDI setup.
Metal-reinforced high-strength PETG enclosure survives all squishes. Multiple hip colorways and custom color options.
Shown below in Neon Green on Black or Black on Superlight Bluewhite
July 24, 2026 UPDATE: First-gen PCB is available now! Soon there will be an enclosure with DIN MIDI ports as well. The next generation PCB has a slightly smaller DMG port and a pin polarity fix on both ports. Because of this, the first-run demo units have a couple bodge-wires and the DMG port has been shaved smaller slightly by hand.
Sept 12, 2026 UPDATE: Enclosure is complete. Metal-reinforced PETG, snaps together without screws. It has the fabled half-DIN ports to allow old-school MIDI! 5 Pin MIDI only uses two of the pins, making this mini MIDI trick possible. Firmware updates for usb host stability as well. The Arduinoboy Web Programmer alternative to the old MAX programmer is now also complete!
Final release version first run units are here now!
Contact me for a free or discounted first-run unit in exchange for a social media post or a video review I can share.
Buy with Shopify Here 🛒
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This independent open-source accessory is not affiliated with Nintendo and is not designed to use, run, or distribute any Nintendo-licensed software, ROMs, games, or content.
