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Mage and Thief — Catskull Electronics' Teensyboy (USB for your Game Boy)
USB MIDI Adapter - Arduino Project Hub
Thursday Customs — MIDI Arduino Boy
Thursday Customs — MIDI Arduino Boy
Teensyboy Pro – Catskull Electronics
noizeInaBox: TeensyBoy official release
My review of Catskull Electronics' Teensyboy (a new USB ArduinoBoy) : r/Gameboy
Midiboy – DIY Arduino Game Console & MIDI Computer
Gameboy DMG-01 with Arduinoboy Midi Interface - MATRIXSYNTH
Catskull Electronics - Testing out this arduinoboy midi out lite board. It's a fork of arduinoboy that only does midi out, but adds some stability and features such as tempo and on