IBM i
Main Menu of IBM i 7.1, shown inside a TN5250 client | |
| Developer | IBM |
|---|---|
| Written in | C++, C, PL/MI, Java, Assembly language, Modula-2, PL/MP |
| OS family | IBM CPF |
| Working state | Current |
| Source model | Closed source |
| Initial release | August 26, 1988 |
| Latest release | 7.6 / April 18, 2025 |
| Marketing target | Minicomputer, midrange computer and enterprise server |
| Available in | English |
| Update method | Program temporary fixes (PTFs) |
| Package manager | RPM and YUM for open source packages |
| Platforms | IBM AS/400, IBM Power Systems |
| Kernel type | shares many Microkernel (SLIC) and Virtual machine (TIMI) design philosophies |
| Default user interface | Text-based user interface |
| License | Proprietary |
| Preceded by | System Support Program, Control Program Facility |
| Official website | ibm |
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IBM i (the i standing for integrated) is an operating system developed by IBM for IBM Power Systems. It was originally released in 1988 as OS/400, as the sole operating system of the IBM AS/400 line of systems. It was renamed to i5/OS in 2004, before being renamed a second time to IBM i in 2008. It is an evolution of the System/38 CPF operating system, with compatibility layers for System/36 SSP and AIX applications. It inherits a number of distinctive features from the System/38 platform, including the Machine Interface which provides hardware independence, the implementation of object-based addressing on top of a single-level store, and the tight integration of a relational database into the operating system.