DDT Symbolic Debugger

This document contains the source code listing for a version of the DDT (Dynamic Debugging Technique) program. It is a fundamental software tool used for debugging, symbol manipulation, and inspection of memory on early digital computers. The listing includes:

• Core routines for symbol table management and searching.
• Break-point and execution routines.
• Input/output routines, including support for title punching and paper tape operations.
• Dispatch tables and command handling logic.
• A comprehensive list of symbols and their corresponding octal values.

The document provides a snapshot of the low-level implementation logic and architectural interaction required to maintain and debug software in the mid-1960s.