History of OS/400

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The operating system, like the hardware of the midrange family, has changed significantly since its release on August 26, 1988 as OS/400 Release 1. The latest version is known as i5/OS V5R4 and was released to general availability on February 11, 2006.

Predecessors

Release life cycle

Current releases

Previous release support

Values for TGTRLS parameter

Installed release *CURRENT *PRV Other valid values
V5R1 V5R1 V4R5 V4R4
V4R5 V4R5 V4R4 V4R3 V4R2 V3R2
V4R4 V4R4 V4R3 V4R2 V3R2
V4R3 V4R3 V4R2 V4R1 V3R7 V3R2