Only PAL Game Cube’s support RGB natively. NTSC GameCube’s support S-Video, which still produces a good picture. If you’re a big fan of the GameCube, or would like to use the GameBoy Player attachment, please read on, as this page should contain everything you need.
This page compares the different video output options of the GameCube
This page demonstrates how the GameCube outputs a better signal than the Wii.
Information on playing GameBoy, GameBoy Color and GameBoy Advance games on your GameCube.
PAL RGB Cables – PAL ONLY! (will not work with NTSC / North American consoles! Did I mention it’s PAL-only?):
SNES-Style Multi-out Universal RGB SCART Cable (UK Seller)
RAD2x HDMI Cable (480p): This cable ONLY supports 240p and 480i modes, just like all other RGB cables.
HD Retrovision SNES Component Video Cable – A high quality component video solution that’s RGB-quality
S-Video (NTSC – will not work with PAL Consoles):
RAD2x HDMI Cable (480p): The RAD2x cable will only work in composite-to-HDMI modes on NTSC consoles. I’d recommend a Carby instead of this for NTSC consoles.
My Life In Gaming recently uploaded an excellent video explaining all the output options of the GameCube, along with lots more information. I highly recommend that any GameCube fan check it out:
– If you want the best quality from your GameCube, you’ll need the official component video cables. They’re extremely expensive, but produce a really high quality image and can even be modified to output VGA.
– If you’re only a casual GameCube user and don’t use the GameBoy Player Adapter, I’d strongly recommend just using a Wii, as early models are fully backward-compatible, including the actual controllers. Also, the Wii opens up an amazing door of opportunity, as described in the Wii section of this site.
– The S-Video (for NTSC) and RGB (for PAL) outputs should be good enough for anyone that’s not a die-hard GameCube or GBA fan. It’s worth giving them a try before dropping a lot of money on a component cable.
– Someone posted a guide for a digital audio mod: http://assemblergames.com/threads/gamecube-toslink.62674/