KA620 Field Maintenance Print Set

This document is the "KA620 Field Maintenance Print Set (MP-02422-01 Rev A1)," copyrighted 1987 by Digital Equipment Corporation. It provides comprehensive technical details for the KA620 rtVAX CPU Module and its associated components, primarily for field maintenance purposes.

The print set is structured into several key sections:

1. Table of Contents and Indexes (Pages 1-4): Provides an overview of the document's organization, listing all major modules, drawing numbers, and descriptions, including the KA620 rtVAX CPU Module (in various configurations), the KA620 rtVAX system, and the KA630 CNF module.
2. Overall System Diagrams (Pages 3, 11, 18-20): Presents high-level and more detailed block diagrams illustrating the architectural breakdown and interconnections of the KA620 rtVAX CPU Module, its interfaces (e.g., Q22 Bus, FPU), and other system components. Schematics are categorized by function (Data Path, Control, Miscellaneous).
3. Parts Lists (Pages 5, 12-17, 110): Features extensive lists of all components used in the KA620 rtVAX CPU Module and the KA630 CNF module, including part numbers, descriptions (e.g., various ICs, memory types, passive components), and reference designators. Specific notes on approved RAM vendors are also included.
4. Circuit Schematics (Pages 6-10, 21-62): Contains detailed circuit diagrams for the KA620 rtVAX system. These cover a wide range of functionalities such as the RTVAX and FPU (including pinouts), memory address decoding and subsystem, Q22 Bus interface logic, various standard logic gates (MUXes, counters, buffers), and critical control circuits like the reset counter, time-of-year clock, and console serial line interface.
5. State Machines and Flow Diagrams (Pages 63-70, 72, 74, 76, 78-79): Illustrates the complex control logic and operational flow for key system elements. This includes detailed state listings and graphical flow diagrams for the memory arbiter, local I/O control machine, and both the master and slave Q22 Bus control machines.
6. Programmable Logic Listings (Pages 80-81): Provides the data listings for the 1KX4 RAS Decode PROM and the PALASM (Programmable Array Logic Assembly Language) code for various PAL devices used for miscellaneous control strobes, memory system CAS control, and parity error detection.
7. Mnemonics Dictionary (Pages 82-83): Defines the technical mnemonics and signals referenced throughout the schematics and listings, aiding in understanding their specific roles and functions within the KA620 system.
8. Signal Cross-Referencing (Pages 84-107): Offers a comprehensive and extensive cross-reference list that traces signals across different schematic pages, indicating their origin and various points of use. This is a critical section for troubleshooting and detailed system analysis.
9. KA630 CNF Module Details (Pages 108-111): Focuses specifically on the KA630 Configuration (CNF) module, providing its assembly details, a dedicated parts list, and diagrams of its pin connectors used to set different system options (e.g., BAUD rates, arbiter modes).

In summary, this document is a comprehensive technical manual providing detailed schematics, parts lists, functional descriptions, and cross-references essential for the maintenance, understanding, and troubleshooting of the KA620 rtVAX CPU Module.