Disc Ddt-8

This document provides technical specifications and operational instructions for the Disc DDT-8 system, a debugging tool for the PDP-8 computer.

Key highlights include:

• System Components: The system is divided into two parts: a resident driver for core swapping and breakpoint logic, and the DDT proper for searching, modifying, examining, and controlling code.
• Operational Changes: It notes specific differences from the standard DDT-8, including updated command syntax (e.g., the use of the key), the addition of a three-breakpoint capability, and specific command removals.
• Implementation: Detailed procedures are provided for loading and saving the DDT onto the disk, including how to set up the DDT driver as a system program.
• Customization: Users can modify the driver's breakpoint locations and memory address origins to suit specific environment requirements.
• Command Reference: The document concludes with a summary of commands (such as register examination, mode selection, and breakpoint insertion) and a list of internal address tags for available registers like the accumulator and link storage.