edit: New question here: viewtopic.php?f=2&t=52503&p=1141618#p1141618
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Original Post:
So the NTSC (U/J) Gamecube does not output RGB. The PAL Gamecube does output RGB, but it's PAL.
I've heard a number of people say on the Internet that you can use a PAL Gamecube in NTSC land to get RGB output for the Gameboy Player, but I'm confused about how to accomplish this. I can't seem to find the answer I'm looking for in Google searches.
Best I can tell, the PAL Gamecube will output PAL50, but it can apparently output PAL60 as well. Are those the only video output options (resolutions aside) that the PAL GCN can do? Can it be forced to output NTSC somehow? When I Googled, I didn't find any NTSC mods for it. So for the people that import a PAL GCN to get RGB output for the Gameboy Player, are they just using it on a display that can handle PAL?
Answer: Unlike composite video, RGB is neither PAL or NTSC. If you're using RGB output, the only thing that will matter is if it's 50 or 60Hz. And since a stock PAL Gamecube can output 60Hz, you're good to go (at least for RGB).