KA675/KA680/KA690 CPU System Maintenance (Final Draft)

This document, titled "KA675/KA680/KA690 CPU System Maintenance," is a comprehensive guide for Digital Equipment Corporation service personnel and qualified self-maintenance customers. It details the procedures and tests required to maintain and troubleshoot VAX 4000 Model 400, 500, and 600 systems, which use the KA675, KA680, and KA690 CPU kernels, respectively.

Key aspects covered in the document include:

1. System Maintenance Strategy: Outlines the methodology, available product service tools and utilities (such as VMS Error Handling/Logging, Symptom-Directed Diagnostic (SDD) tools like VAXsimPLUS, ROM-Based Diagnostics, Firmware Console Commands, and Loopback Tests), and information services (TIMA, STARS, DSNlink).
2. CPU System Overview: Provides a detailed look at the KA675/KA680/KA690 CPU modules, MS690 memory modules, and BA440 enclosure components (H3604 console module, System Control Panel, backplane, power supply, and fans).
3. System Setup and Configuration: Guides users through CPU and memory module ordering, general and recommended Q-bus option arrangements, mass storage options, system expansion using expanders, and specific rules for DSSI VAXcluster configurations. It also details the firmware commands and utilities (like SHOW, CONFIGURE, SET HOST/DUP) used for system and device parameter configuration, including setting allocation classes, unit numbers, node names, system IDs, and write-protecting RF35 ISEs.
4. System Initialization and Acceptance Testing: Describes the power-up sequence, Power-On Self-Tests (POST) for the kernel, Q-Bus options, and mass storage devices. It explains CPU ROM-based diagnostics, main memory layout and state, and the operating system bootstrap and restart procedures (including VMB, disk/tape, PROM, and network boots).
5. System Troubleshooting and Diagnostics: Offers a basic troubleshooting flow, methods for interpreting VMS error logs (CPU, memory, system bus, DMA faults) using ANALYZE/ERROR, and leveraging VAXsimPLUS for fault management and call logging. It also covers interpreting POST/ROM-based diagnostic failures, testing DSSI storage devices, and using MOP Ethernet functions and loopback tests to isolate problems.
6. FEPROM Firmware Update: Provides instructions for preparing the processor, and updating firmware via Ethernet or tape, along with a list of potential error messages.

The document is extensively supported by appendices detailing firmware commands, address assignments, ROM partitioning, data structures, configurable machine states, MOP counters, KFQSA adapter programming, error messages, and related documents. The "Information for Reviewers" note on the cover indicates the document is a final draft from April 1992, with new material covering KA675, KA690, and Kernel support for VAXsimPLUS.