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.
i5/OS was the name IBM used for the AS/400 lineage's operating system from 2004, when it replaced the OS/400 name alongside the eServer i5 (POWER5) launch, until April 2008, when it was renamed again to IBM i as part of the Power Systems unification.
Related Terms
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.
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.
POWER6
IBM's dual-core processor generation shipped starting May 2007, notable for very high clock speeds and hardware decimal floating-point support.