With System software 7.6 the name was changed to Mac OS in January 1997. Since 1994 System 7.5 supported for the first time the PowerPC architecture and is optimized with the following Mac OS versions further on this architecture. Thus allow the operating system can use more memory and more powerful programs. System 7.0 first supported 32-bit addressing. Cooperative Multi-tasking could optionally be enabled in System 6. The operating system was programmed up to system 6.0 mostly in assembler and partially in Pascal and used a 24-bit addressing mode.
System 5.0 was the first release to run several programs with the integrated MultiFinder at the same time. Starting with System 3.0, the used filesystem HFS was used officially, which does not different between uppercase and lowercase letters. Mac OS does not include a command line interface. Overall the interface is very easy to use and does not need the right mouse button for user interaction. The graphic representation is reduced to the essence. The classic desktop is designed as a single user operating system and almost completely hides the full path to files and directories. The first version was "System 1" and appeared bundled with the Mac in 1984. With own Macintosh hardware, Mac OS takes up a special role in the world of desktop systems. Mac System Software Mac OS was named by the company Apple as "Mac System Software" in the beginning, a specially designed operating system only for 68K first Motorola processors.