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Difino
| • | Classic, or Classic Environment, is a hardware and software abstraction layer in Mac OS X that allows applications compatible with Mac OS 9 to run on the OS X operating system. It utilizes a Mac OS 9 System Folder, a New World ROM file, and Apple's 68k emulator to bridge the differences between the older 68k and PowerPC Macintosh platforms and the XNU kernel environment. Classic has been a key element of Apple's strategy to replace the "classic" Mac OS (versions 9 and below) with Mac OS X as the standard operating system used by Macintosh computers, by eliminating the need to use the older OS directly. It is the only way to run "classic" applications on an Apple G5 system, which cannot boot Mac OS 9 or earlier. However, it is not planned to be included in versions of Mac OS X which run on future Apple systems based on Intel processors.
Classic is a descendant of Rhapsody's "Blue Box" emulation layer, which served as a proof of concept. It can be loaded at login (for faster activation when needed later), on command, or whenever a Mac OS application that requires it is launched (to reduce the use of system resources when not needed). It requires a full version of Mac OS 9 to be installed on the system, and loads an instance of that OS in a sandbox environment, replacing some low-level system calls with equivalent calls to Mac OS X via updated system files and the Classic Support system enabler. This sandbox is used to launch all "classic" Mac OS applicationsࢀ&#-2828;here is only one instance of Classic running for a given user, and only one user per machine may be running Classic at a time.
If the "load-when-needed" option is selected, double clicking a "classic" application first launches Classic, which can be configured to appear in a window resembling the display of a computer booting into Mac OS 9. When Cl
Source: [wikipedia: classic (mac os x)]
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