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IBM i (OS/400) Operating System's Unique Architecture and History Detailed
Key points
- IBM i (AS/400) was developed in the 1980s by IBM Rochester.
- It merged System/38's advanced features with System/36's usability.
- The system uses an object-based architecture, not traditional files.
- TIMI layer ensured software compatibility across platform changes.
The Genesis of IBM i
The IBM i operating system, formerly known as AS/400, originated from the "Silver Lake" project at IBM's Rochester laboratory in the 1980s. This initiative sought to integrate the advanced capabilities of the System/38, which included an integrated relational database and innovative memory management, with the user-friendly interface of the System/36.
Architectural Innovations
The AS/400 platform, launched in June 1988 with its dedicated OS/400 operating system, featured a unique architecture designed by Dr. Frank Soltis. A core principle of its design was the protection of client software investments. This was achieved through the Technology Independent Machine Interface (TIMI) abstraction layer, which allowed applications from older systems to migrate without requiring code rewrites.
Distinctive System Design
Unlike many other operating systems, IBM i does not employ a traditional file system. Instead, it operates on an object-based model where all disk and operational memory are treated as a single, flat address space. This design philosophy has remained consistent despite various marketing name changes over the decades, including iSeries and System i, to its current designation as IBM i.
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Reporting from
The IBM i operating system, originally AS/400, is highlighted for its unique architecture that integrates a relational database and treats everything as an object, diverging from typical file-based systems. This system, developed in the 1980s, aimed to combine the advanced features of System/38 with the user-friendliness of System/36, and its design prioritized backward compatibility through the TIMI abstraction layer.