VAX/VMS Virtual Memory: Segmented FIFO and Page Replacement

How do operating systems manage physical memory when hardware assistance is limited? Understanding the elegant design choices of classic systems like VAX/VMS reveals the foundational concepts that power modern kernel engineering and virtualization today. This text-only course guides you through the inner workings of virtual memory, focusing on how VAX/VMS implemented efficient page replacement without native hardware reference bits. You will learn to trace memory allocation, analyze page faults, and understand the mechanics of the segmented First-In, First-Out (FIFO) algorithm. What you'll learn: 1. Understand the fundamentals of virtual memory, page tables, and address translation. 2. Analyze the mechanics of the Segmented FIFO page replacement algorithm and its advantages. 3. Explore how VAX/VMS emulates page reference bits in software to optimize memory management. 4. Compare classic paging strategies with modern operating system memory allocation patterns. 5. Practice tracing page faults and memory state changes through step-by-step written exercises. You will start with the basic terminology of physical and virtual memory before diving into the specific architecture of VAX/VMS. From there, you will walk through detailed scenarios illustrating how pages transition between active and inactive states in a segmented queue. This course is designed for computer science students, aspiring systems programmers, and software engineers who want to understand low-level operating system design. No prior systems programming experience is required. Start reading today to build a solid foundation in operating system memory management.