This hack turns an Apple Watch into a mostly working Game Boy Color
But O’Flaherty-Chan has managed to use that as a starting point and build out the watchOS version from there, although he notes that the Apple Watch lacks support for OpenGL or Metal, which made it a little difficult to write the pixels to the screen.
Developer gets a Game Boy emulator running on the Apple Watch, because he canArs Technica
Open source ‘Giovanni’ emulator prototype brings Game Boy games to Apple Watch9 to 5 Mac
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