Ok, I'm not sure to fully understand all of what you are saying but before installing the new hdd in the iMac 600, I formatted it with my other computer (Macbook Pro). I think I did Mac extended format. My other macs are either brand new (2 iMac 5K, 1 MacbookPro, one mac mini and one mac pro) or max 2 years old so I don't have the possibility to format the drive with the MacOS9 drivers like I used to before I change all my computers.
So, I am stuck with a new hard drive and no original CD. I was able to boot from the 9.2.2 CD, an old eMac original I have, it asked me to install the OS but then, when I reboot the computer, if the CD is not in the slot, it showed me a floppy disk with a question mark in it.
I did not fully understand what you said regarding applications/software I can use.. :S
Thanks for your help! VERY appreciated!
Marc