Meet ENGAGE: a battery free mobile gaming device that is powered by gamers’ actions and sunlight. This sustainable gaming device runs a Nintendo Game Boy emulator that can run classic games like Tetris. Its hardware is powered by sunlight and button presses.
More gadgets like this: here
As the makers explain:
this emulator is capable of intermittent operation by tracking memory usage, avoiding the need for always checkpointing all volatile memory, and decouples the game loop from user interface mechanics allowing for restoration after power failure.
Jasper de Winkel, Vito Kortbeek, Josiah Hester, and Przemyslaw Pawelczakare behind this neat idea.
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