What Is AS400? The IBM i Operating System Explained (2026)

What Is AS400? The IBM i Operating System Explained (2026) — IT Management 101

By Linda Garrould — Reviewed 16 August 2026 What is AS400? AS400 is the everyday name for IBM’s midrange business computing platform — also known, depending on the decade, as iSeries, System i and (since 2008) IBM i. Launched in 1988 as the successor to the System/38, it is an integrated system of hardware, operating … Read more