Point 4 Data Corp of Tustin, California has announced Release 9 of its proprietary operating system, Iris, which UK distributors, Wednesbury, West Midlands-based Isis and Stockbridge, Hampshire- based Aspin Management Systems say is poised to take on Unix: Isis says that Iris is more portable than Unix, it is based on RISC architecture – it was written for the Data General Nova – and can execute an instruction in one machine cycle compared to seven to 10 for Unix.