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The IBM System i (formerly known as iSeries, AS/400, and Application System/400) is a minicomputer platform produced by IBM.

It was officially introduced as the AS/400 in 1988. It was then renamed to the eServer iSeries in 2000 as part of IBM's e-Server branding initiative.

In 2006, the platform has once again been renamed to System i.

As the current midrange offering, the System i platform offers features intermediate between mainframe systems and PC-based servers.

The IBM System i platform extended the System/38 architecture of an object-based system with an integrated DB2 database that was designed to implement E. F. Codd's relational database model, which is based on Codd's 12 rules, in the operating system and hardware.

Equally important were the virtual machine and single-level storage concepts which established the platform as an advanced business computer.

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Désiré Athow

Désiré has been musing and writing about technology during a career spanning four decades. He dabbled in website building and web hosting when DHTML and frames were en vogue and started writing about the impact of technology on society just before the start of the Y2K hysteria at the turn of the last millennium. Following an eight-year stint at where he discovered the joys of global tech-fests, Désiré now heads up TechRadar Pro. Previously he was a freelance technology journalist at Incisive Media, Breakthrough Publishing and Vnunet, and Business Magazine. He also launched and hosted the first Tech Radio Show on Radio Plus.