"The original SINIX was a modified version of Xenix and ran on Intel 80186 processors"

2 versions were available right from the start: 1 for 8086 intel processors on the Siemens PC-X (single user) and PC-MX (2-4 users) NOTE: the PC-MX was originally branded "Siemens 9780", and in some literature referred to also as "Siemens 9780: Siemens 9750 (BS2000, DCAM) Intelligent Terminal Emulator And Standalone Microcomputer" and the last system bearing a "PC" prefix in any literature.

the second version was a later XENIX port for NS32016-and above-based systems (National Semiconductors 32 bit cpu, 16 bit bus) the Siemens MX-2 and MX-4, and MX-500 (4 x NS32016 or 4 x NS32032). The version of SINIX SysV that ran on the MX-500 was the fist to use the "universe" concept by use of the

universe {sie|att|ucb}

command.

The MX-300, I believe, was an Intel 386 based system, but i used it only for a couple of days at its launch so memory may betray me.