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raphnet. - Gamecube controller to N64 passthrough (limited compatibility)
Ultimate N64/GC x2 – Ultimate Mister FPGA
raphnet.] Classic controller to N64 adapter - V2 | eBay
raphnet. - Gamecube controller to N64 adapter (v3)
DIY N64 to Gamecube controller adapter (more details in comments) : r/n64
Cube64 GameCube to N64 Adaptor – scanlime
N64 - WiiVC Controller Adapter with Full Stick Correction by James — Kickstarter
The Adapter Factor - Gamecube to N64 Adapter Review - YouTube
Wireless Game Controllers Adapter for Nintendo 64 Console to PS3 PS4 PS5 Switch | eBay
MayFlash N64 Controller Adapter for Nintendo Switch Windows PC USB | eBay
Amazon.com: Gamecube Adapter for Nintendo Switch Gamecube Controller Adapter and WII U and PC, Super Smash Bros Gamecube Controller Adapter. Support Turbo and Vibration Features with 180cm Long Cable : Video Games