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Part VI: Appendices > The Boot Process

The Boot Process

To boot into Classic, Mac OS X requires that the installed version of Mac OS 9 be 9.1 or later. If you’re running an earlier version, you must upgrade it first. The first time that Mac OS X boots the Classic environment, it must add some software to your computer to be able to operate. This software acts as a bridge between the Mac OS X process monitors and I/O systems. If you choose not to add these components when prompted, Classic cannot operate and quits.

If you have a Mac OS X–compatible version of Mac OS 9 that isn’t the most current release, Mac OS X might give you a warning with instructions on how to update the earlier operating system.


Although at press time Mac OS 9.2 is the preferred Classic OS for Mac OS X 10.2, users with 9.1 can boot into Classic.



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