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The macOS architectural legacy is the successor to Mac OS 9 and the Classic Mac OS legacy. However, unlike the Classic Mac OS, it is a Unix-based operating system [33] built on NeXTSTEP and technology developed at NeXT from the late 1980s until early 1997, when Apple purchased the company, and its CEO Steve Jobs returned to Apple.
Mac OS 9.0.4 was a collection of bug fixes primarily relating to USB and FireWire support. Mac OS 9.1 included integrated CD burning support in the Macintosh Finder and added a new Window menu in the Finder for switching between open windows. Mac OS 9.2 increased performance noticeably and improved Classic Environment support.
The Classic Environment, usually referred to as Classic, is a hardware and software abstraction layer in PowerPC versions of Mac OS X that allows most legacy applications compatible with Mac OS 9 to run on Mac OS X. The name "Classic" is also sometimes used by software vendors to refer to the application programming interface available to ...
The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2011 and then OS X until 2016, began with the company's project to replace its "classic" Mac OS. That system, up to and including its final release Mac OS 9 , was a direct descendant of the operating system Apple had used in its Mac computers since their ...
For a list of current programs, see List of Mac software. Third-party databases include VersionTracker , MacUpdate and iUseThis . Since a list like this might grow too big and become unmanageable, this list is confined to those programs for which a Wikipedia article exists.
Apple dropped support for Classic mode on the new Intel Macs. Third party emulation software such as Mini vMac, Basilisk II and SheepShaver provided support for some early versions of Mac OS. A new version of Xcode and the underlying command-line compilers supported building universal binaries that would run on either architecture. [132]
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Although the "Classic Mac OS" boot process is convoluted and largely undocumented, it is not more limited than an IBM PC compatible BIOS. Like a PC's master boot record, a ROM-based Mac reads and executes code from the first blocks ("boot blocks") of the disk partition selected as the boot device. The boot blocks then verify that a suitable ...