Apple SOS
Boot screen | |
| Developer | Apple Computer |
|---|---|
| OS family | SOS |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | January 1980 |
| Latest release | 1.3 / January 1, 1980 |
| Update method | Manual |
| Platforms | Apple III |
| Kernel type | Monolithic kernel |
| Default user interface | Full screen text mode |
| License | Apple Software License Agreement |
The Sophisticated Operating System, or SOS (/sɔːs/), is the primary operating system of the Apple III computer. SOS was developed by Apple Computer and released in October 1980.
In 1985, Steve Wozniak, while critical of the Apple III's hardware flaws, called SOS "the finest operating system on any microcomputer ever".