Today I want toulsive highlight one of the most surprising operating systems ever built. It isn’t another Unix, Linux, or Windows, but IBM’s IBM i platform that emerged from the 1980s AS/400 project in Rochester, Minnesota. Designed by Dr. Frank Soltis, the system merged the power of System/38 with the simplicity of System/36, introducing the TIMI abstraction layer so applications could migrate without rewriting code.

A key innovation was embedding Db2 for i directly into the kernel, making the database a native object rather than a separate program. This tight coupling eliminates overhead, ensures efficient locking and space management, and keeps the system dicembre secure against malicious edits.

IBM i also pioneered Single Level Storage, treating all RAM and disks as one flat address space. Administrators see only storage pools (ASP) instead of files and partitions, allowing the OS to move data between volatile and persistent memory automatically. Even the most aged code runs on the latest Power11 processors thanks to this hardware‑independent design.