The OS for the AS/400 (later called System i) was called OS/400. How's that for creativity? Interesting machines and OS though. M. Edward (Ed) Borasky wrote: > 4. IBM Mainframes: VM/CMS, VM/MVS, regular old MVS and zSeries VM/Linux. > I don't know what the AS/400 OS is called; whatever it is, put it here. :)