Installation instructions for OSX on a 6500 by Thomas Koons:

Back up all important files now as we will erase your HD!

First you must boot to a OS 9.x installer CD. Then you must prepare your HD. This means making 2
or 3 partitions. If your Drive is over 8Gigs then you must have 3 Partitions. Make the first 
partition 650MB to 1G. This will be for the installer. Make the second partition up to 7.5Gigs 
but no more so you donŐt go over the 8Gig limit. This means you might choose 7Gigs if you picked 
1Gig or less for the first partition. That will total 8Gigs and you will be sure it all fits 
within the first 8Gigs. The third partition if needed will just fill up the rest of the drive or 
you can even make more partitions. ThatŐs up to you.

Next you must reinstall your OS since you just blasted your drive. Use the OS 9 installer CD you 
are booted to and run the OS 9 installer. Install it to either the second or third partitions. If 
you put it on the third partition then you can erase OSX without harming your OS 9 install so 
that might be a good idea. Then update to the latest version of OS 9 that you want to. OS 9.1 is 
a good place to stop or you can use OS9 Helper and upgrade to OS 9.2.2. Then reboot to the OS 9 
partition you just installed

Now install Apple System Restore version 2.1.2 which is part of the Automate ASR 1.0 package. 
This can be found on www.versiontracker.com. Put the OSX 10.0.x through 10.1.5 install CD 
(depending on what you own. Must be a full installer) in to your CDROM drive. Drag the CD icon to 
the ASR application, not any of the apple scripts in the ASR folder. It will launch ASR and ask 
where to restore to. Pick the 1Gig partition and make sure you tell it to erase then restore. It 
did not work for me if I just told it to overwrite any data that might be there?

With that finished you can use XpostFacto to boot to your new OSX installer. Use version 2.2b9 of 
XPF for this. Then Tell XPF to boot from the 1Gig partition that has your restored OSX installer. 
Select the second partition as the location to install to. Under the Open Firmware menu make sure 
autoboot is deselected. Under input, select keyboard, and under output, select ATY*** (this is 
your ATI video chip). Now you can click install.

It will boot to open firmware. Type boot to continue with the install, type bye to get back to 
OS9. So type boot. It will reboot and after a few minutes the installer should launch. Follow the 
installation instructions and make sure to pick the second partition for the install location. If 
your first plus second partition sizes are over the 8Gig limit then you will not be able to 
select the second partition as the entire partition must be with in the first 8Gigs of the HD. 
Not just less then 8Gigs in size. There is a big difference in meaning here! Select the drive and 
continue to install. After installation is complete it will reboot but this time it should boot 
to the OSX install on your second HD and then run the setup assistant. If you get this far then 
all is well :)

Once the setup assistant is finished you can have some fun. I went and updated OSX to 10.1.5 at 
this point. It can be done over the internet if you have a compatible PCI Ethernet card or 
external dialup modem. The COMM II slot is not recognized. Or you have to download the file from 
somewhere else and copy it to the HD from OS 9 and then boot back into OSX and run the installer 
off the HD. I have no SCSI support for some reason so I cannot use a ZIP disk or CDROM to move 
files over in OSX :(

If everything is setup correctly you can reboot and be prompted with open firmware and just type 
bye to get back into OSX. Its suggested to use XPF each time you wish to boot into OSX though. 
This time however pick your second partition as the boot drive and no need to worry about the 
install location. Click reboot and not install and you will be back in OSX.

Hope this helps.
Tom