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All the software which makes your system operate. I guess it’s technically referring to processes and not to frameworks/libraries. For example MacOSX is an Operating System (OS). A typical OS is responsible for handling files and processes (and all that that entails).

Many Systems on a PowerBook (55 OSs on one machine) []

Known Operating Systems

*Pre-Macintosh Apple OS

*DOS 3.1 - Apple’s first official release of DOS *DOS 3.2 *DOS 3.3 *UCSD Pascal System - ‘P-System’. Multiplatform environment allowing ‘write once, run anywhere’ Pascal programs. A forerunner to Java. It even used platform-independent bytecodes. Developed at the University of California, San Diego. *SOS/PRODOS - The operating system designed for the Apple III computer. *ProDOS - The successor of Apple DOS *ProDOS 8 - This is ProDOS renamed when ProDOS 16 came into existence. *ProDOS 16 - Released to accommodate the Apple IIGS *Apple GS/OS *Apple GS/OS SYSTEM 6 *Lisa OS - Ran the Apple Lisa []

*Apple Macintosh OS

*MAE - Macintosh Application Environment. Ran System 7 under A/UX, Solaris and HP-UX. A forerunner to Classic.

*AppleRhapsody *MacOSX Server 1.x (Rhapsody) *MacOSX Public Beta (Kodiak) - 13 September, 2000 *10.0 (Cheetah) - 24 March, 2001 *10.1 (Puma) - 29 September, 2001 *10.2 (Jaguar) - 24 August, 2002 *10.3 (Panther) - 24 October, 2003 *10.4 (Tiger) - 29 April, 2005

*In January 2003, Apple registered the trademarks Lynx, Cougar, Leopard, and Tiger. So we’re covered ‘till 10.7

*Other Operating Systems that shipped or are shipping on Apple Hardware as the primary OS

*Other OS that ran on Apple Hardware

*Alternative UNIX OS

*NeXTSTEP / OpenStep - Next Computer - Since bought by Apple and is now the foundation for Mac OS X. *SunOS - Sun Microsystems BSD *Solaris - Sun Microsystems UNIX *BSDs - Berkeley Standard Distributions

*FreeBSD *NetBSD *OpenBSD *BSDi (BSD/OS) *DarwinOS *SunOS - BSD-based predecessor to Solaris

*GNU/Linux - Linux is just the kernel, the rest is GNU

*Debian Linux *Mandrake Linux *Red Hat Linux *Slackware Linux *Gentoo Linux *SuSe Linux *IBM Linux *DistccPPCKnoppix *MkLinux - defunct Apple-sponsored linux on top of a Mach microkernel *Many other Linux distros exist. I don’t think we need to list them all :p

Irix - SGI Unix *HP-UX - Hewlett-Packard Unix *AT&T System V *Xenix - Microsoft’s version of Unix for microprocessors. *SCO (The Santa Cruz Operation) UnixWare *Note: This company that may currently holds rights to System V and if it has it’s way will be turning GNU/Linux into a $700+ per processor licensing nightmare. see [ ] and [ ]

*Other Operating Systems

See Also:

*A History of Apple’s Operating Systems [] *GrokLine which aims to trace all of UNIX history accurately (Needs help on the OS X section) [] *Wikipedia Mac OS History [] *Wikipedia Mac OS X History [] *Early Mac OS History [] *Operating System Technical Comparision [] *The GUI Gallery [] *Emulators of other Operating Systems on MacOS [] *Encyclopedia article about Mac OS X []