Skip to Main Content
The operating system for Application System/400™ (AS/400™) provides an unprecedented breadth of function and system services in a single, integrated system. The majority of functions are implemented on top of an abstract, high-level machine interface in a hardware-independent manner, using many architectural characteristics normally associated with poor performance. Despite these architectural and functional traits of the operating system, the AS/400 exhibits excellent price and performance characteristics for commercial applications and is a competitive system in the mid-range commercial application arena. A number of design and optimization techniques, many of them unique or innovative, were incorporated into the AS/400 to achieve a combination of advanced design, function, and performance and are the main subjects discussed in this paper.
Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.