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3.2. What Is Classic?

To help bridge the application gap between Mac OS 9 and Mac OS X, Apple has built a virtual machine that enables you to run older Mac software under Mac OS X in the Classic Environment, or just Classic. Classic is an emulator that looks and feels just like Mac OS 9, and, in fact, it is—just slightly watered down.

Classic allows you to run most older Mac applications on Mac OS X without requiring you to boot directly into Mac OS 9. The big difference is that Classic applications won't benefit from the features of Mac OS X, such as protected memory and its advanced printing capability. Meaning, if a Classic application crashes, it can bring down everything else running under Classic; just as a crash under Mac OS 9 could affect your entire system.


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