This document provides a step-by-step process to enable Classic Environment support on PowerPC Macs running Mac OS X 10.4 or lower without the original Mac OS 9 recovery disc. It involves downloading a pre-made Mac OS 9 disk image from Apple's support website, running the installer, enabling the root user to access the disk image files, copying the OS 9 system files to the hard drive, and starting up Classic Environment from System Preferences. This allows users to run classic Mac applications on newer PowerPC Macs that do not natively support booting into Mac OS 9.

1. How to Enable Classic Environment support on newer
PowerPC Macs without the original recovery disc
If you have a PowerPC-based Mac with Mac OS X 10.4 (or lower) you can use classic
Mac applications designed for Mac OS 9 and below, however because of the poor way it
was implemented and supported it can be a pain to enable classic support on a newer
PowerPC-based Mac that cannot natively boot into Mac OS 9 (ex. iBook G4) so unless
you still have the Mac OS 9 recovery disc (which many eBay sellers seem to hardly ever
include for some reason), the only other officially supported choices Apple gives you is
to either a) buy another Mac that supports native boot into OS 9 and copy the System
folder from it b) try to find another copy of the Mac OS 9 recovery disc that came with
your specific Mac. What makes it even worse is that you cannot simply use a retail copy
of Mac OS 9.1 (or 9.2) and install it because Mac OS X demands that classic is enabled
before running the Mac OS 9 installation which can be a very annoying conundrum. Also
you can't simply copy the System Folder from a retail Mac OS 9 disc over to your Mac
OS X Hard Drive because you'll get an error saying "The system software on the startup
disk only functions on the original media, not if copied to another drive." However, there
is a nice solution to this problem that I found from
http://hintsforums.macworld.com/showpost.php?p=486162&postcount=9 it basically
involves using a pre-made Mac OS 9 disk image created by Apple.
What You Will Need:
- A PowerPC-based Mac with Mac OS X 10.4 or lower
- Internet
- At least 1 GB of available Hard Drive space
- Basic Computer knowledge
Step 1: Download the Mac OS 9 NetBoot Image from Apple
Download the disk image from http://support.apple.com/kb/DL1192?viewlocale=en_US
Step 2: Run the NetBoot package installer
Double-click the NetBoot9.dmg file, a disk image called "NetBoot for Mac OS 9" should
appear on the desktop. Open the disk image and open the English folder (or whatever
your corresponding language is) and double-click the NetBoot package installer.
Let the package installer run through the file extracting process. After the package
installer completes you may get a message that says "There were errors installing the
software. Please try installing again." ignore it as the files were still copied successfully.

2. Step 3: Enable and login to the Mac OS X root user
After running the NetBoot 9 package installer you should notice a folder called
NetBootInstallation. This is where the Mac OS 9 Disk Image resides, but for some reason
its access is restricted for regular users (even Admin type users), so you'll need to enable
the Mac OS X root account. To enable the root user you must use the NetInfo Manager
app (located in the Applications > Utilities folder). In the NetInfo Manager click the Lock
to the bottom left of the app (you'll need to authenticate to an admin account to do this),
then click Security, then Enable Root User. If it asks you set a password for root just set
any password that you can remember.
Now log out of your current account (or switch users to the login window if you have fast
user switching enabled). When on the login dialog click Other.. then enter root for the
username and the password you entered earlier, then click login.
Step 4: Copying the Mac OS 9 files from the disk image
Now that you're logged in as root you can access the previously inaccessible
NetBootInstallation folder. Navigate to the NetBootInstallation folder, first copy the Mac
OS ROM file to your Mac's hard drive, then double-click the NetBoot HD.img file (the
actual Mac OS 9 Disk Image) to open the disk image and copy the Applications (Mac OS
9) and System Folder folders to your Mac's hard drive.
Step 5: Cleaning up and first classic startup
Now that the Mac OS 9 files are copied the NetBootInstallation folder can be deleted (as
it's no longer needed) and you can log out of the root account and back into your regular
Mac OS X account. Also for security reasons you should disable the root account by
simply going back into NetInfo Manager, click the bottom left lock, re-authenticate
yourself and then click Security, then Disable Root User.
Now to start classic open the System Preferences app, click Classic, then in the classic
settings click the Start button. If there are other System Folders that classic finds make
sure to pick the one simply titled System Folder in your Mac’s hard drive.
Now classic should start up for the first time. If it asks you to update the classic
installation just push the update button to continue. Once Mac OS 9 fully boots up classic
is now enabled and you can enjoy any classic application you want again.