| Developer | Sun Microsystems |
|---|---|
| OS family | Unix (BSD/SVR4) |
| Working state | Historic; now marketed as Solaris |
| Source model | Closed source |
| Initial release | 1982 |
| Latest release | 4.1.4[1] / September 1994[2] |
| Platforms | Motorola 680x0, Sun386i, SPARC |
| Kernel type | Monolithic kernel |
| Default user interface | SunView, OpenWindows |
| License | Proprietary (binary only) |
| Succeeded by | Solaris |
SunOS is a Unix-branded operating system developed by Sun Microsystems for their workstation and server computer systems. The SunOS name is usually only used to refer to versions 1.0 to 4.1.4, which were based on BSD, while versions 5.0 and later are based on UNIX System V Release 4 and are marketed under the brand name Solaris.