Single Level Storage — Part 4: pointer tagging explained. Learn how IBM i uses tag bits (in memory and on disk) and processor support to enforce isolation without separate address spaces.

Discover how IBM i’s single level storage unifies memory and disk into one address space—no explicit file I/O, automatic caching, fast process switching, and implicit memory sharing. Plus: why security is different.

Single level storage, Part 2: a clear tour of virtual memory OS design—MMU, process isolation, paging/swapping, and disk access—before we dive into IBM i’s model.

A simplified introduction to single level storage on IBM i—covering memory addressing, processor operations, disk management, and how real memory systems work.