VAX 4000 Model 100, 100A, 105A, 106A KA52/53/54 CPU System Maintenance

This document is a System Maintenance Manual for VAX 4000 Models 100, 100A, 105A, and 106A systems, specifically focusing on the KA52, KA53, and KA54 CPU modules.

Target Audience: Digital Services personnel and customers with self-maintenance agreements.

Key Information Provided:

1. CPU Module Description: Details the physical and functional aspects of the KA52/53/54 CPU (including speed and cache differences between models), memory modules (MS44/MS44L), and their installation.
2. System Configuration: Covers guidelines for memory configurations, internal and external mass storage devices (SCSI, DSSI, tape, CD-ROM), and various asynchronous and synchronous communications options.
3. Firmware Commands: Explains the console I/O mode control characters, command syntax, qualifiers, and provides a detailed list of console commands (e.g., BOOT, DEPOSIT, EXAMINE, FIND, HALT, HELP, INITIALIZE, MOVE, NEXT, REPEAT, SEARCH, SET, SHOW, START, TEST, UNJAM, X, !).
4. System Initialization & Testing: Describes the power-up sequence, Power-On Self-Tests (POST), CPU ROM-based diagnostics, and basic acceptance test procedures. This includes information on memory layouts, processor registers, and operating system bootstrap processes (VMB, PROM, MOP Ethernet).
5. Troubleshooting & Diagnostics: Offers comprehensive methods for diagnosing system problems, interpreting error logs (CPU faults, memory errors, system bus faults, DMA/host transaction faults), and utilizing VAXsimPLUS for symptom-directed diagnosis and call logging. It also covers running loopback tests for console ports, Ethernet, and Q-bus options.
6. FEPROM Firmware Update: Provides procedures and error messages related to updating the system's firmware via Ethernet or tape.

The manual also includes several appendices detailing address assignments, ROM partitioning, CPU firmware data structures, configurable machine states, NVRAM partitioning, MOP counters, and comprehensive error codes and messages.