How to map the N64's Z button in RetroPie/EmulationStation

RetroPie Z-index controller config
Zach Zach (232)

When you first connect your USB N64 controller to RetroPie, the UI will prompt you to map your controller buttons. However, there is no option for the Z button -- one of the most important buttons for playing Nintendo 64 games emulated in RetroPie/EmulationStation.

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By default, Nintendo 64 games on RetroPie treat Z the same as L2. Since the N64 controller only has two bumpers (L1 and R1), simply use the L2 option to map the Z button.