felix-assiris

The Felix-C-256 computer was a mainframe computer produced in Romania in the 1970ies (https://ro.wikipedia.org/wiki/Felix_C). It was more or less a copy of the IRIS-50/IRIS-80 computers produced in France by CII. It was produced by the 'Fabrica de Calculatoare' near Bucharest. Both the computer and the production technology were licenced from CII. It ran the SIRIS-2 operating system that ran also on the IRIS.

At their turn the IRISes were produced under licence from SDS (Scientific Data Systems, later XDS after acquisition by Xerox) being similar to the SDS Sigma-7 and Sigma-9 computers. There is a SIMH simulator of the Sigma computers, with an operating system (CP-V) in binary form that works like the original.
This is a simulator of one single threaded Felix job that must consist of a restriction to the most commonly used instructions and of the ASSIRIS assembler, together with essential control instructions and macros.