KA670 CPU System Maintenance

This document is the KA670 CPU System Maintenance guide from Digital Equipment Corporation, intended for their Customer Services personnel and qualified self-maintenance customers.

The guide provides comprehensive information for the VAX 4000 Model 300 systems, focusing on the KA670 CPU and its maintenance. It covers:

1. KA670 CPU and Memory Subsystems: Details the hardware components of the KA670 CPU (e.g., P-Chip, F-Chip, C-Chip), its variants, how it integrates with MS670 memory modules, and its connectivity via DSSI, Q22-bus, and Ethernet. It also describes the H3604 Console Module for system interaction.
2. Internal and External Configuration: Outlines guidelines for system setup, including module placement, installation of supported options, device addressing, and configuring mass storage (DSSI) and dual-host VAXcluster capabilities.
3. KA670 Firmware: Describes the functions of the ROM-resident firmware, covering automatic/manual bootstrap, operating system restart, and an interactive console command language. It details power-up sequences, LED codes, and provides a comprehensive list of console commands (e.g., BOOT, EXAMINE, DEPOSIT, SHOW, TEST) and their syntax.
4. Troubleshooting and Diagnostics: Provides practical procedures for diagnosing and resolving system issues using ROM-based diagnostics. This includes interpreting error messages and LED displays, running specific memory and loopback tests (for console, DSSI, Ethernet), and utilizing local diagnostic programs for RF-Series Integrated Storage Elements (ISEs) to isolate faults to Field-Replaceable Units (FRUs).

The document also includes appendices with detailed technical specifications, such as address assignments, ROM and RAM partitioning, data structures, comprehensive error message lists, descriptions of the machine state on power-up, and MOP (Maintenance Operation Protocol) support, along with a glossary of terms.