Trying to install classic system on iMac G5

Hello,
I just purchased an old iMac G5 with OS X 10.3.9 and I want to install OS 9.1 classic in order to run old programs.
I have the iMac system software CD and the 4 restore CD. I understand that I am suppose to start the computer
by inserting the install CD and holding the "C" key during startup. I have done this and the computer is not starting
from the CD. After startup when running installer I get the error, "Classic cannot update files in "System Folder" on
iMac Install CD because the disk is read-only. Any suggestions would be appreciated.

XPostFacto helps you get around required routines in your Mac's ROMs that are not present on certain older Macs. It is not needed to install 10.2 Jaguar on an iMac -- Apple supports 10.2 Jaguar on iMacs. I have used it to install 10.3 Panther on beige G3s, which Apple declined to support. It works well for what it does, but it is not magic.
Be sure you have updated the firmware in your iMac before trying to install Mac OS X. The firmware updater requires a Hard Drive-based OS 8 or 9 to run, and cannot be run just from a CD.
60384- About iMac Firmware Update 1.2 Document and Software
Mac OS X is BIG. It will install over 200,000 files by default. A Hard drive under 4 GB will probably be too small for practical use. It will probably need more than 64 MB memory just to boot from the CD, never mind actually install. You will undoubtedly need more RAM memory.
The original Bondi Blue iMac makes installing memory particularly complicated. You need to remove and dis-assemble the system unit (containing the motherboard, Hard Drive, and CD) and then remove the processor module and install laptop SODIMMs into slots on the processor card. There is a good step-by-step illustrated manual available on this site, and there may also be a quicktime movie.

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