AS400
Also known as: Application System/400, AS/400
IBM's original Application System/400 midrange platform, introduced in 1988 and now known as IBM i on Power Systems.
The AS400 (Application System/400) was IBM's integrated midrange business computing platform introduced in 1988. Over its history the name changed from AS400 to iSeries (2000) to IBM System i (2006) to IBM i on Power (2008), but application compatibility has been preserved through every transition, including onto Power11. Many organizations planning a Power11 migration are still running applications with roots in the original AS400 platform.