BOS Software Ltd has now implement-ed its BOS multi-user operating system for the IBM PS/2 Models 30, 50 and 60, and up to eight users can be supported on the 50 and 60 with the appropriate IBM boards: networking versions are not available on these models as ARCnet cards can only be installed in the Model 30’s PC-compatible bus: a single-user version costs UKP200, the concurrent version is UKP300, and multi-user versions start at UKP650 and networking ones go for UKP950 up.