DW780 Field Maintenance Print Set

This document is the "DW780 Field Maintenance Print Set" for the Digital Equipment Corporation's DW780 UNIBUS Adapter Assembly.

It provides a comprehensive set of technical drawings and information for the maintenance and understanding of the DW780, including its variations (DW780-AA and DW780-AB, which include different power supplies).

The document is organized into several key sections:

• Table of Contents and Drawing Directory: Lists all included diagrams, modules, and system components, and details the specific variations covered.
• System Overviews: Includes a Module Utilization diagram and U.B.A. Block Diagrams, providing a high-level architectural view of the UNIBUS Adapter.
• Functional Modules: Contains detailed prints for various boards such as the UNIBUS System Interface (USI), UNIBUS Control Board (UCB), UNIBUS Memory Data (UMD), UNIBUS Adapter Interface (UAI), UNIBUS Port Control (UPC), and UNIBUS Bus Terminator (UBT), often referred to by their M-series part numbers (e.g., M8270, M8271, M8272, M8273, M9042, M9044).
• Operational Details: Features U.B.A. Timing Diagrams (e.g., for SBI Read and Write operations) and U.B.A. Micro Flows, illustrating the detailed operational logic and sequences of the adapter.
• Interconnections: Provides diagrams for the Backplane Assembly (U.B.A.) and various cable types (coax, ribbon, AC/DC power), showing how the system's components are physically and electrically connected. Also includes details for UNIBUS to H854 Adaptor Boards.
• Physical Specifications: Includes Board, Drill, and Etch patterns, providing manufacturing and physical layout information.
• Parts Lists: Comprehensive lists of all components, subassemblies, and materials required for the DW780 assembly.

This print set is a crucial reference for technical personnel involved in the field maintenance, troubleshooting, and understanding of the DW780 UNIBUS Adapter.