Xorg-xf86-video-ati doesn't include the mach64 driver. Would it be possible to have it included in the repository perhaps as a separate package? Xorg includes it in 7.4 and 7.5 so it's not unsupported. 7.4 ships version 6.8.0. It would make sense to include it since SliTaz is such a good distro for legacy hardware and this is a pretty common graphics chip on older systems.