AS400
IBM's mid-range business computer platform introduced in 1988. The original name that persists as colloquial shorthand for IBM i and IBM Power Systems worldwide.
The IBM Application System/400 (AS/400) was a mid-range business computer system introduced by IBM on June 21, 1988. Developed at IBM's Rochester, Minnesota facility, the AS400 was designed to succeed the System/36 and System/38 platforms. It featured an integrated relational database (DB2/400), an object-based operating system (OS/400), and a single-level storage architecture that abstracted hardware from software in ways that set it apart from competing platforms. IBM renamed the AS400 to iSeries in 2000, System i in 2006, and the OS was renamed IBM i in 2008. The hardware line became IBM Power Systems. Despite these official name changes, AS400 remains the dominant search and colloquial term for the platform worldwide.