SINIX
| Developer | Siemens Nixdorf Informationssysteme, Fujitsu Siemens Computers | 
|---|---|
| OS family | UNIX System V | 
| Working state | Discontinued | 
| Source model | Closed source | 
| Initial release | 1984 | 
| Latest release | 5.43 (SINIX), 5.45 (Reliant UNIX) / 1995 (SINIX) | 
| Platforms | NSC-32x32, Intel 80186, Intel 80386, Intel 80486, MIPS | 
| Kernel type | Monolithic kernel | 
| Userland | SUS | 
| License | Proprietary | 
| Official website | Reliant UNIX/SINIX | 
SINIX is a discontinued variant of the Unix operating system from Siemens Nixdorf Informationssysteme. SINIX supersedes SIRM OS and Pyramid Technology's DC/OSx. Following X/Open's acceptance that its requirements for the use of the UNIX trademark were met, version 5.44 and subsequent releases were published as Reliant UNIX by Fujitsu Siemens Computers.