In a previous post I mentioned that the Digi RetroBoy could be a Revo K101 equivalent if it was ever released. Instead of relying on emulation it utilises a hardware solution to play GBA games from a customised GBA cartridge with a MicroSD card inside it. It looks as though the unit is released now, although read postMaxZhou88’s Digi RetroBoy Prototype
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DIGI Retroboy Review - My First Retro Handheld Emulator
Digi Retro Boy . The Ultimate Retro Emulator Handheld ?
Obscure Handhelds
DIGI Retroboy Review - My First Retro Handheld Emulator
DIGI Retroboy Review - My First Retro Handheld Emulator
RetroSpy Pixel GameBoy Printer Emulator from RetroSpy Technologies on Tindie
MaxZhou88's Digi RetroBoy Prototype
The Digi RetroBoy May Or May Not Be A Thing
Retro game console with 7 cm color display (2.8), 300 games, 16 bit - PEARL
The Digi RetroBoy GBA Clone