Coordinates | 55°45′06″N37°37′04″N |
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{{infobox software | name | Classic Environment |
logo | |
screenshot | |
developer | Apple Inc. (formerly Apple Computer, Inc.) |
latest release version | 1.9 |
latest release date | March 21, 2005 |
operating system | Mac OS X |
genre | Software layer |
license | Proprietary |
website | Apple.com }} |
Classic Environment 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 applications—there is only one instance of the Classic process 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 Classic is finished loading, the application launches. When a "classic" application is in the foreground, the menu bar at the top of the screen changes to look like the older Mac OS system menu. Dialog boxes and other user-interface elements retain their traditional appearance.
Classic's compatibility is good, provided the application using it does not require direct access to hardware or engage in full-screen drawing. However, it is not a perfect clone of a Mac OS 9 computer. The Finder included with Mac OS X v10.2 and later does not support the "Reveal Object" Apple event used by Mac OS 9 applications, causing the "Reveal In Finder" functionality for those applications to be lost. Early releases of Mac OS X 10.2 would often fail to draw window frames of Classic applications correctly, and after Classic windowing was made double buffered in Mac OS X v10.3, some older applications and games sometimes failed to update the screen properly, such as the original Macintosh port of Doom. Additionally (somewhat to the surprise of end-users) Classic resurrected some older applications that had previously been unusable on the Macintosh Quadra and Power Macintosh series; this is because Mac OS X replaced Mac OS 9's virtual memory system with a more standard and less fragile implementation.
Classic's performance is also generally acceptable, with a few exceptions. Most of an application is run directly as PowerPC code (which would not be possible on Intel-based Macs). Motorola 68k code is handled by the same Motorola 68LC040 emulator that Mac OS 9 uses. Some application functions are actually faster in Classic than under Mac OS 9 on equivalent hardware, due to performance improvements in the newer operating system's device drivers. These applications are largely those that use heavy disk processing, and were often quickly ported to Mac OS X by their developers. On the other hand, applications that rely on heavy processing and which did not share resources under Mac OS 9's co-operative multitasking model will be interrupted by other (non-Classic) processes under Mac OS X's preemptive multitasking. The greater processing power of most systems that run Mac OS X (compared to systems intended to run Mac OS 8 or 9) helps to mitigate the performance degradation of Classic's emulation.
Category:Mac OS X Category:Compatibility layers
es:Macintosh Classic fr:Classic (Mac OS X) it:Classic (Mac OS X) ja:Classic fi:Classic (Mac OS X)This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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