Here's an overview of AS400.
The AS/400 was introduced in 1988 by IBM as a minicomputer for general business and departmental use. It underwent several rebrandings until its last rebrand in 2006 to the name of IBM System i. It remained in production until April 2008 when it was replaced by the IBM Power Systems line. It uses an object-based library-based operating system called IBM i. The operating system also underwent rebrandings in accordance with the name changes of the general line. At first it was called OS/400 (following the name schema that gave birth to OS/2 and OS/390). Later on became known as i5/OS in line with the introduction of the eServer i5 servers featuring POWER5 processors. Finally, it was called just IBM i coinciding with the 6.1 release.
Features include a DBMS (DB2/400), a menu-driven interface, multi-user support, dumb terminal support (IBM 5250), printers, as well as security, communications and web-based; which could be programmed either inside the (optional) IBM WebSphere application server or in PHP/MySQL[1] using a native port of the Apache web server.
While in Unix-like systems everything is a file, on the System i everything is an object, with built-in persistence and garbage collection. It also offers Unix-like file directories using the Integrated File System [2]. Java compatibility is implemented through a native port of the Java virtual machine.
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