Blip, the 1970s portable Pong clone, was entirely electro-mechanical and in the right light conditions, it was possible to play without batteries as one could see the unlit LED under the screen [full video: buff.ly/2L5ouWD]
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Very impressive mechanism! I feel like someone should try and replicate something similar with Lego
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Thanks for the transparent view. Blip was my first electronic handheld game.








