KC780 Field Maintenance Print Set

This document is a Field Maintenance Print Set for the KC780 console system and related components, published by Digital Equipment Corporation in 1977.

The print set serves as a comprehensive technical guide for maintenance and understanding the system's internal workings. It includes:

1. Table of Contents: Outlining all major assemblies covered.
2. Drawing Directories: Providing an overview of the included drawings for each main assembly.
3. Assembly Drawings: Detailed diagrams illustrating the physical assembly and layout of various units and sub-assemblies.
4. Parts Lists: Extensive lists of all components, including part numbers, descriptions, and quantities, for each assembly.
5. Electrical Schematics: Detailed circuit diagrams for digital logic, power distribution, control signals, and data paths of various boards and modules, such as:
   • System Control Panel
   • 4K RAM boards
   • LSI11 Interface
   • Read/Write Control Board (for floppy disk)
   • H771 and H780 Power Supplies
   • System Backplane
   • Lights & Switches Board (Slave Console)
6. Firmware Listing: A substantial section providing the assembly code for the RX01 Floppy Controller, including detailed comments on instructions, conditions, error codes, and various operational routines (e.g., initialization, find sector, read/write sector, fill/empty buffer).
7. Wiring Diagrams and Cable Specifications: Illustrating internal cabling and connections within the system.
8. Configuration and Installation Notes: Providing crucial information on memory setup, bootstrap locations, component substitutions, and specific installation procedures for various unit variations (e.g., different voltage/frequency options for the KC780 console and power supplies, various processor and memory configurations for the 11/03 unit).

The document is essential for understanding the design, assembly, and maintenance of the KC780 system and its integrated peripheral components.