Direct Booting Mac OS 9.x
To boot directly into Mac OS 9.x, use the Startup Disk System Preferences panel, shown in Figure 4.16.
After searching the mounted disks (this can take a while) for viable systems, each of the accessible system folders is listed in the Startup Disk panel. Each icon lists the OS version and volume name. To select one, click the icon; a status message will appear at the bottom of the screen describing your choice.Figure 4.16 Boot directly into Mac OS 9.x using the Startup Disk panel.
Quit the System Preferences application when you're finished. The next time you restart your computer, it will boot into the operating system you selected.
Booting into OS X
To switch back to OS X after running 9.2, you follow a similar process as switching from Mac OS X to Mac OS 9. From the Apple menu, choose Control Panels, and then select and open the Startup Disk control panel, which is displayed in Figure 4.17.Figure 4.17 The Mac OS 9.x Startup Disk control panel works the same way as the Mac OS X Startup Disk panel.
Each mounted disk is displayed on a line in the control panel. Disks that include a bootable system folder have a disclosure arrow directly in front of them. Clicking the disclosure arrow displays the operating systems located on that disk, along with their path and version.
To boot into OS X, highlight the OS X installation within the list, and then click the Restart button in the lower-right corner. If you don't want to restart immediately, close the control panel. The next time the system restarts, it will boot into the selected system.
Advanced users may want to use the bless command, which chooses what folders can (and should) boot your computer. In short, on a two-partition system, bless can be invoked like this to set your Mac's OpenFirmware to boot from OS 9:
sudo /usr/sbin/bless/ -folder9 '/Volumes/<path to Mac OS 9 System Folder>' -setOF
Or, from Mac OS X:
sudo /usr/sbin/bless/ -folder '/System/Library/CoreServices' -setOF
You should familiarize yourself with the command line (see Chapter 12) and read the bless manpage before attempting to use the command.