The OMNIBUS Interface

Chapter 9 of the PDP-8/E documentation provides a comprehensive overview of the OMNIBUS architecture. It details how the OMNIBUS serves as a standardized backplane for hardware modules, eliminating complex backplane wiring while maintaining high signal density. The chapter covers essential hardware considerations for designers, including signal definitions, bus specifications, and logic levels. Furthermore, it outlines techniques for system expansion, supporting the addition of various peripheral controllers, memory units, and custom interfaces. The document also provides a foundational guide for building interface control modules and utilizing the OMNIBUS for I/O transfers.