SINIX

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SINIX (later renamed to Reliant UNIX) was a version of the Unix operating system from Siemens Nixdorf Informationssysteme. Supecedes SIRM OS and Pyramid Technology's DC/OSx. Its last release under the SINIX name was version 5.43 in 1995. 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. The last release of Reliant UNIX was version 5.45.

The original SINIX was a modified version of Xenix and ran on Intel 80186 processors. Later versions based on System V were designed for the SNI RM-200, RM-300, RM-400 and RM-600 servers running on the MIPS processor (SINIX-N, SINIX-O, SINIX-P, SINIX-Y) and for the PC-MXi on the i386 processor (SINIX-L).

In some versions of SINIX the user could emulate the behaviour of a number of different versions of Unix (known as universes). These included System V.3, System III or BSD. Each universe had its own command set, libraries and header files.