10.0 through 10.3 install on the tray-load iMac just fine. 10.1.3 or higher is needed for proper video drivers, though.
With XPostFacto, 10.4 can be installed, and it is usable, but I prefer 10.3 on mine. (233 MHz, 160 MB RAM, stock 4 GB hard drive.)
With XPostFacto, 10.4 can be installed, and it is usable, but I prefer 10.3 on mine. (233 MHz, 160 MB RAM, stock 4 GB hard drive.)