DECnet-RSX Internals

This document covers the internal structure and implementation of DECnet-RSX. It details:

• System Architecture: Explains the Communications Executive (CEX), process layers (LLC, DLC, DDM), and interprocess control flow.
• Data Structures: Describes process databases, buffer management (CCBs, SDBs, LDBs/RDBs), and timer support.
• Network Loading: Outlines the components involved in loading the network software (NTL, NTINIT, NM, NCP) and the phases of setting up the system, processes, and lines.
• Troubleshooting: Provides information on debugging aids such as the NTD (Network Demo Program) and CEDUMP for inspecting internal data structures.
• Implementation Details: Includes macro definitions, dispatch tables, and logic flow diagrams for various network operations like link creation, data transfer, and routing.