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IMPORTANT LINKS

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. The system I platform offers features between mainframe systema and PC- based servers.

Features:
The IBM System i platform extended the system/38 architecture of an object-based system with an integrated DB2 database. Equally important were the virtual machine and single-level storage concepts which established the platform as an advanced business computer.

Instruction set:
One feature that contributes to the longevity of the system I platform is its high-level instruction set (called TIMI ), which allows application programs to take advantage of advances in hardware and software without recompilation. TIMI is a virtual instruction set; it is not the instruction set of the underlying CPU. User-mode programs contain both TIMI instructions and the machine instructions of the CPU, thus ensuring hardware independence.

Software:
The IBM System i includes an extensive library-based operating system,i5/OS, and is also capable of supporting multiple instances of AIX, Linux, Lotus Domino, Microsoft Windows 2000 and Windows Server 2003.
LPAR (Logical PARtitioning), a one of the basic feature introduced from IBM's mainframe computers, facilitates running multiple operating systems simultaneously on one IBM System i unit. A system configured with LPAR can run various operating systems on separate partitions while ensuring that one OS cannot run over the memory or resources of another. Each LPAR is given a portion of system resources (memory, hard disk space, and CPU time)
Other features include an integrated DB2 database management system, a menu-driven interface, multi-user support, printers, security, communications, client-server and web-based applications. Much of the software necessary to run the IBM System i is included and integrated into the base operating system.

Programming:
Programming languages available for the AS/400 include RPG, assembly language, C, C++, Pascal, Java, Perl, Smalltalk, COBOL, SQL, BASIC, PHP, PL/I, Python and REXX. It also supports the Java language, including a 32-bit Java Virtual Machine (JVM) and a 64-bit JVM.

Hardware:
The AS/400 was originally based on a custom IBM CISC CPU which used a CPU architecture known as Internal MicroProgrammed Interface (IMPI) and an instruction set similar to the IBM 370. It was later migrated to a POWER-based RISC CPU family eventually known as RS64.