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GameCube Controller → N64? Impossible Directly. Use Adapters / Emulation Instead.

No physical/electrical conversion exists. GameCube (analog sticks, 8 buttons, proprietary serial) ≠ N64 (single stick, 10 buttons, different protocol).

Why It's Impossible

Protocol: GC = bidirectional serial (4-bit). N64 = custom 3-wire (SI).
Pinout: GC 6-pin. N64 4-pin (data, clock, latch, power).
Stick Encoding: GC = 8-bit ADC per axis. N64 = optical encoder quadrature.

Real Solutions

Goal	Solution	Cost
Use GC Controller on N64 Console	Raphnet GC→N64 Adapter (pass-through, preserves analog). Or 8BitDo Retro Receiver + GC Bluetooth (wireless).	$25–35
Use N64 Controller on GameCube/Wii	Raphnet N64→GC Adapter. Works on Wii U (vWii) too.	$25
Play N64 Games on PC with GC Controller	Dolphin / Project64 / Mupen64Plus → Map GC controller (via USB adapter: Mayflash, DolphinBar, Raphnet).	$15–25 (adapter)
Modern N64-Style Controller	8BitDo M30 (2.4G/BT), Retro Fighters Brawler 64, Hyperkin Admiral.	$30–50

Best All-Around

8BitDo M30 2.4G — N64 layout, wireless, works on Switch, PC, Mac, Android, Steam Deck. No adapters needed.

Don't butcher controllers. Buy the right adapter or modern pad.

Nintendo Wii