A 500 MHz iMac should run OSX just fine. I've installed it on a 400 MHz, and was surprised how fast it worked - fancy screen effects and all.

But as other people have pointed out here, this requires enough RAM. You didnt say which version OSX discs you had, but I would say that the first full-blown, well-working version of X was 10.3 ("Panther"). This requires at least 256 Mb RAM. Enough for surfing, mail and word processing. If you are gonna use big programs like PhotoShop or InDesign, you need even more. If you want to run Tiger (OS X 10.4) you will need more RAM than with Panther.

An important point: OSX is much more particular about what kind of RAM chips it accepts than OS9 was. The necessary firmware update before OSX will check the RAM, and PERMANENTLY DISABLE RAM NOT UP TO SPECS! Meaning it won't be avaiable to OS9 anymore either...

Best to check yourself first: run "DIMM First Aid" (sent you off-list). If it says RAM is OK, you can go on to the firmware update. Both DIMM First Aid and the firmware update must run under OS9, so don't erase everything yet..

THEN boot from the first OSX install disc (by holding down the C key on your keyboard). From the File menu in the installer, choose Disk Utility (or whatever it is called). This is where you erase the hard drive. Doing that you also have the chance to "partition" it so it appears as two separate drives. The point of this is that you can have OS 9 installed on one partition, and if anything goes wrong with the OSX partition you can always force the Mac to boot from OS9 (by holding down the key sequence Shit-Option-Apple-Backspace). Very useful. And the OS 9 can also be used from inside OSX (as "Classic")

Make a small OS9 partition, say 1-2 Gb, and the rest of the hard drive for OSX.

Quitting Disk Utility brings you back to the X installer. Just click OK and go ahead with the default install. After a while it will reboot, then ask for the second install disc.

Now you have a well-functioning OSX, with Airport support and a nice mail program and web browser. There are lots of good, free word processors you can download; I use Mariner Write, which can open and save Word-documents when needed. As a last step, boot from the OS9 disc and run that installer on your small hard drive partition. Then go to Apples site and update to 9.2

Looks complicated when explained here, but all this is really very straight forward to do 8-)


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