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Part VI: Appendices > Running Classic Applications

Appendix B. Running Classic Applications

As briefly discussed in Hour 1, “A Tour of Mac OS X,” the Classic environment is a way for Mac OS 9 to function under Mac OS X. Using Classic, almost any application that’s functional in Mac OS 9 can run inside Mac OS X as long as a recent version of Mac OS 9 is also installed. (If you need help installing Mac OS 9, refer to Appendix A, “Installing Mac OS X,” which also discusses installation of Mac OS 9.)

You must have at least 128MB of memory to use Classic. Also, a 400MHz G3 (or faster) computer is recommended. Why? Classic is a process running under Mac OS X. When it’s in use, your computer is supporting two operating systems simultaneously. As you can imagine, this is quite resource intensive.




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