MicroVAX

This document is the MicroVAX Maintenance Guide, published in October 1985. It serves as a comprehensive resource for the maintenance, installation, configuration, and troubleshooting of MicroVAX II computer systems.

Key areas covered include:

1. System Overview: Details system architecture, including different enclosures (BA23, BA123, H9642), their mass storage capacities, backplanes, power supplies, and I/O distribution.
2. CPU/Memory Information: Describes core components like the KA630-A CPU and MS630 memory modules, including their specifications and configuration.
3. Installation: Provides step-by-step guidelines for setting up the various MicroVAX II system configurations (BA23-based, BA123-based, H9642-based), including physical placement, cabling, and initial console settings.
4. Supported Options: Outlines a wide range of supported peripheral options (communication devices, disk storage, tape storage) and their specific configuration settings (CSR addresses, interrupt vectors, jumper settings).
5. Configuration Rules: Explains how to correctly configure modules, including physical priority, memory allocation, and power requirements, using tables and diagrams.
6. MicroVAX Maintenance System (MMS): Introduces the MMS as a primary tool for diagnostics, system configuration display, and utility operations, including how to load it and navigate its menus.
7. Troubleshooting: Offers comprehensive procedures for diagnosing and resolving system issues. This includes using diagnostic ROMs, interpreting LED status and error messages, and analyzing system error logs and crash dumps (for both MicroVMS and Ultrix-32M operating systems). It provides flowcharts for systematic problem identification.
8. FRU Removal and Replacement: Contains detailed, step-by-step instructions for the removal and replacement of Field Replaceable Units (FRUs) for almost all hardware components within the BA23, BA123, and H9642 enclosures.
9. Appendices: Provides reference material such as console commands, console error messages and explanations, MicroVMS error log commands, loopback connector information, system interconnection pinouts, and a list of related documentation.

The guide emphasizes careful handling to prevent damage to components, particularly due to static electricity, and often recommends power-down procedures before component replacement. It is intended for qualified service personnel or technically-oriented users.