IPAC2 Config on retropie (works with mame, nes, snes, n64, psx, ...) : r/ RetroPie
Arcade Buttons - How Many? Layout? - RetroPie Forum
Arcade Buttons - How Many? Layout? - RetroPie Forum
GitHub - alexjohnmartin/RetroPieArcadeCabinet: Instructions and plans to build your own mini arcade cabinet powered by a Raspberry Pi, running RetroPie for emulation
Guide: Setting Up a RetroPie controls using IPAC2 Controller - Extensive Tutorial + Preconfigured files - RetroPie Forum
Home Arcade with a Raspberry Pi & RetroPie (with trackball) | Josh's Random Tech Blog