
IBM i (the i standing for integrated) is an developed by for . It was originally released in 1988 as OS/400, as the sole operating system of the line of systems. It was renamed to i5/OS in 2004, before being renamed a second time to IBM i in 2008. It is an evolution of the operating system, with compatibility layers for . IBM had two distinct POWER- and PowerPC-based hardware lines since the early 1990s: • Servers running processors based on the architecture in the family (later known as iSeries, then System i) running OS/400 (later known as i5/OS, and now )