10.5.8 is the highest any PPC Mac can go.
Though you can update yours for free to 10.4.11...
The combo update for PowerPC-based Macs...
Repair Permissions afterwords, reboot.
* Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
minimum system requirements
* 512MB of memory (I say 1.5GB for PPC at least, 2-3GB minimum for IntelMacs)
* DVD drive for installation
* 9GB of available disk space (I say 30GB at least)
Classic/OS9 Apps no longer supported.
May be available from Apple again???...
Trouble is Apple no longer sells it, check eBay & such for the Retail version, not the Gray Discs...
There are workarounds if the 867MHz CPU is the only hangup...
List of Applications Not Compatible with Leopard...
TenFourFox -- It's a port of the latest FireFox to run on older hardware and software.
"World's most advanced web browser. Finely tuned for the Power PC."
-- works for me on 10.4. Supports 10.5
alternative download site:
Turn on pipelining. This will allow Firefox to make simaltaneous requests to the server. Chrome has pipeling turned on. Some sites could fail to load with pipeling set on. The site will be old. See "Increase pipelining" in:
OmniWeb uses the lastest Safari framework. The open source WebKit. Other browsers like Safari and iCab use the OS version of WebKit. The OmniWeb downloaded dmg includes it's own copy of the latest WebKit.
Safari 4.1.3 for Tiger