An Exposition on SAV in RSX-11M-PLUS

This document provides a detailed technical overview of the SAV utility in RSX-11M-PLUS V2.0. It explains how SAV functions to copy the current system image from memory to a disk file, ensuring modifications become permanent and the system remains hardware-bootable. The document covers the two-phase operation of SAV, technical challenges such as memory resident overlays, the use of special drivers for disk I/O, and the intricate process of handling task control blocks, file identifiers, and interrupt vectors during system saves and restorations. It also provides a comprehensive roadmap of SAV's modules and an exhaustive list of the procedural steps and safety checks performed when saving or restoring a system.