PowerPC versions of Mac OS X prior to 10.4.11 include a compatibility layer called Classic, enabling users to run applications and hardware requiring Mac OS 9 from within Mac OS X. This is achieved through booting a full Mac OS 9 system. As a result, Mac OS 9 must be installed on the computer for Classic to function. Most Mac OS 9 applications run well in Classic, although some applications demonstrate screen redraw problems. In addition, scanner drivers and many other utilities no longer work.
In May 2002, at Apple's Worldwide Developers Conference in San Jose, California, Steve Jobs, accompanied by a coffin, held a mock funeral[7] to announce that Apple had stopped development of Mac OS 9. Mac OS 9.2.2, introduced in December 2001, was the final version of Mac OS 9, and the end of the classic Mac OS.
In June 2005, Jobs announced that the Macintosh platform would be transitioning to Intel x86 microprocessors. Developer documentation of the Rosetta PowerPC emulation layer revealed that applications written for Mac OS 8 or 9 would not run on x86-based Macs. The Classic Environment remains in the PowerPC version of Mac OS X 10.4; however, x86 versions of OS X do not officially support Classic.
As a workaround for Intel-based Macs, Mac OS 9 can be emulated up to version 9.0.4 by using SheepShaver, a PowerPC emulator. It cannot emulate above 9.0.4 because SheepShaver does not emulate a memory management unit. The PearPC PowerPC emulator does not support Mac OS 9
Last edited by Ducani : 04-14-2010 at 09:46 AM.
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