RetroArch is an all-in-one emulation platform ... right and left jumps from one menu to another, indicated by the icons at the top of the screen. "Enter" lets you select a menu item, "Backspace ...
XDA Developers on MSN4mon
How I turned my Raspberry Pi into a retro-gaming beast using RetroArchRetroArch will reboot when updating the assets. Once it reboots, the emulator will start displaying proper icons and keys.
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