Yesterday I put forward the idea that we might be able to create a Leopard boot drive for G4/G5 Macs, using only an Intel Mac. In the article I included a step by step method to do this, but hadn't actually attempted it yet.
I got the chance to try this today, and it works perfectly. In fact, I'm typing this on a G4 Cube running off such a drive.
To summarize the previous post, here are the steps:
1. Use an Intel Mac and the Leopard install disc to create a bootable Leopard drive. This drive will use the GUID Partition Table (GPT), so it cannot be used to boot a PowerPC Mac. Only Intel Macs can boot from GPT drives.
2. Using Disk Utility, format another drive with the Apple Partition Map (APM) option. This will erase everything on this drive. (You can skip this step if you already have an APM drive.)
Note that you must change the "Volume Scheme" from "Current" to "1 Partition" to un-grey the "Options" button. Press that button and then select "Apple Partition Map" for the new drive.
After the partitioning process is finished, you are left with an empty APM drive.
3. Clone the Leopard install from the original GPT drive to the new APM drive.
And you're done. The resultant cloned APM drive will be bootable on a PowerPC Mac. Easy as pie!
This works because Leopard and its included applications are universal. I would therefore only recommend this method with a new clean install, since software installed separately may not be universal.
So why not just install OS X Leopard directly from the original install DVD onto the PowerPC Mac? Sometimes this is not possible. For example, Leopard won't install on older G4 Macs. To get around this you can use another more recent PowerPC Mac to install the OS, but not everyone has a PowerPC Mac. If your other Macs are Intel Macs only, then the method outlined above can be used.