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In September 2002, Apple announced that "new" computer models (introduced in or after 2003) won't be able to boot into Mac OS 9 any more.
On those models, Mac OS 9 can only be used as Mac OS X's 'Classic environment'.
Related documents:
- Macintosh: Some Computers Only Start Up in Mac OS X
- Mac OS 8 and 9: Compatibility With Macintosh Computers
- Install Mac OS 9 to use Classic applications
- Mac OS X: How to Use Mac OS 9 Applications
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