System 1
| A version of the classic Mac OS operating system | |
The original "System 1" desktop
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| Developer | Apple Computer, Inc. |
|---|---|
| OS family | Macintosh |
| Source model | Closed source |
| Released to manufacturing |
January 24, 1984 |
| Latest release | 1.1 / May 5, 1984 |
| Kernel type | Monolithic |
| License | Proprietary |
| Succeeded by | System 2 |
| Support status | |
| Unsupported, historic | |
"System 1", originally named Macintosh System Software, was the first Apple Macintosh operating system and the beginning of the classic Mac OS series. It ran on the Motorola 68000 microprocessor. System 1 was released on January 24, 1984, along with the original Macintosh, the first in the Macintosh family of personal computers. It received one update, "System 1.1" on May 5, 1984, before being succeeded by System 2.
This operating system introduced many features that would appear for years to come, some even still existing in the current macOS, and a few existing in other graphical operating systems such as Microsoft Windows.
The features of the operating system included the Finder and menu bar. In addition to this, it popularized the graphical user interface and desktop metaphor, which was used under license from Xerox PARC.
Due to the limited amount of RAM and the lack of an internal hard disk in the original Macintosh, there was no multitasking with multiple applications, although there were desktop accessories that could run while another application was loaded. Also, items in the Trash were permanently deleted when the computer was shut down or an application was loaded (quitting the Finder).
The menu bar was a new and revolutionary part of the OS. Similar to the one found on the Lisa OS, the Macintosh menu bar had 5 basic headers when on the desktop: the Apple menu, File, Edit, View, and Special. When in an application, the menus would change to better fit the application's uses.
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