Ddt

This document is a programming manual for DDT-8 (DEC Debugging Tape), a debugging tool designed for the PDP-8 computer.

Summary: DDT-8 facilitates the debugging of programs by allowing users to interact directly with the computer, rather than relying on manual console switches or time-consuming batch processing. It enables programmers to:

• Examine and modify memory contents and registers symbolically or in octal.
• Control program execution by setting breakpoints, which pause program execution at specific points to allow for inspection of the machine state.
• Search memory for specific data or instruction patterns.
• Define and manage symbols and symbol tables for easier code reference.
• Punch binary tapes directly from memory to save corrected versions of programs without needing to fully recompile or reassemble source code.

The manual includes detailed procedures for setting up a debugging run, loading programs, using specific command syntax for control and inspection, and includes appendices with a summary of commands and the internal symbol table.