Note: The 6100, 7100, and 8100 class Apple computers require a Mac OS 9.1 full install CD to upgrade to Mac OS 9.1. Also, the Mac OS X Public Beta and Mac OS 9.1 are not compatible. If you install Mac OS 9.1, the Classic environment in the Mac OS X Public Beta will no longer function.
RequirementsMacOS 9.0 or later (US Version only).
*Previously available here