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All versions of the system released since then run exclusively on 64-bit Intel CPUs and do not support Power PC applications.
The heritage of what would become mac OS had originated at Ne XT, a company founded by Steve Jobs following his departure from Apple in 1985.
The first is colloquially called the "classic" Mac OS, which was introduced in 1984, and the final release of which was Mac OS 9 in 1999.
The project was first code named "Rhapsody" and then officially named Mac OS X.There, the Unix-like Ne XTSTEP operating system was developed, and then launched in 1989.The kernel of Ne XTSTEP is based upon the Mach kernel, which was originally developed at Carnegie Mellon University, with additional kernel layers and low-level user space code derived from parts of BSD.Ars Technica columnist John Siracusa, who reviewed every major OS X release up to 10.10, described the early releases in retrospect as 'dog-slow, feature poor' and Aqua as 'unbearably slow and a huge resource hog'.Version 10.4, Tiger, reportedly shocked executives at Microsoft by offering a number of features, such as fast file searching and improved graphics processing, that Microsoft had spent several years struggling to add to Windows with acceptable performance.