Today I tried the experimental Gentoo PPC64 LiveCD and it worked. I totally got two Tuxes… Tuces… Tuxi… Tuxii… whatever and a #-prompt.

And then I remembered it was a Gentoo system and against my religion to use that, so the first command I entered was halt<enter>, which printed haltC on the prompt… Great, wrong keymap. Luckily the numpad-enter was a real enter, so I tried that one.