How to Connect PS4 Controller to Retropie - YouTube
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Amazon.com: 2 Pack 2.4 GHz Wireless USB Controller Compatible with SNES Games, SAFFUN SNES Retro USB PC Super Classic Controller for Windows PC MAC Linux Genesis Raspberry Pi Retropie (Multicolored Keys) :
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The Ultimate Guide To RetroPie Controllers – Fun Consumer Tech
Games and emulation quality - How to turn a Raspberry Pi into a retro games console | TechRadar
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