IBM i
The current name of the operating system that ran the AS/400 as OS/400 and later i5/OS. Renamed to IBM i in April 2008, alongside the Power Systems brand unification.
IBM i is the operating system descended from OS/400 (1988) and i5/OS (2004), renamed a second time to IBM i in April 2008 as part of the Power Systems unification. Version numbering changed at the same time, from V5R4/V6R1 to a simpler 5.4/6.1 format; IBM i 6.1 was the first release under the new name.
Related Terms
i5/OS
The name used for the AS/400's operating system from 2004 to 2008, between OS/400 and IBM i, tied to the POWER5 processor generation it launched alongside.
Power Systems
The unified IBM server brand created in April 2008 when System i and System p, previously separate product lines, merged on the POWER6 processor generation.
System i
IBM's server product line running i5/OS (later IBM i), the direct descendant of the AS/400, sold as a separate brand from System p until the 2008 Power Systems unification.