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+[* blue] The IC is a custom (or relabeled) Nintendo chip marked "WCRX-DOL / T2.7488K1". ("Wireless Controller Receiver - Dolphin"). It is presumably a microcontroller that decodes signals from the radio and sends them to the console.
+[* yellow] This 4-pin connector goes to the joypad connector on the GameCube.
+[* red] Desolder these four points to remove the shield and expose the radio on the other side.

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