IBM AS/400

The IBM System i is IBM's previous generation of midrange computer systems for IBM i users, and was subsequently replaced by the IBM Power Systems in April 2008.
The platform was first introduced as AS/400 on June 21, 1988 and later renamed as the eServer iSeries in 2000. As part of IBM's Systems branding initiative in 2006, it was again renamed to System i.
In April 2008, IBM announced its integration with the System p platform. The unified product line is called IBM Power Systems and features support for the IBM i (previously known as i5/OS or OS/400), AIX and Linux operating systems. Power4 or older hardware ran OS/400 exclusively.