Omnibus Interface

This document, Chapter 9 of the PDP-8/E documentation, provides technical specifications and design guidelines for interfacing custom hardware to the PDP-8/E OMNIBUS. Key topics include:

• Bus Description: Overview of the OMNIBUS architecture, signal types, and system expansion capabilities.
• Interface Design: Detailed information on Programmed I/O and Data Break interfaces, including timing diagrams, logic flow, and signal assignments.
• Electrical & Construction Guidelines: Rules for signal loading, electrical considerations for driving lines, grounding, and physical component layout.
• Testing & Programming: Procedures for initial checkout, system testing, and recommended device coding conventions.
• Hardware Accessories: Descriptions of available connectors, mounting panels, and wiring tools for constructing custom interfaces.