VAX 6000 Models 300 and 400 Service Manual

This service manual for the VAX 6000 Models 300 and 400 series is intended for Digital customer service engineers. It provides comprehensive information for diagnosing, servicing, and replacing components within these systems.

Key areas covered include:

• System Overview: Introduces changes with the VAX 6000 Model 500 platform, differentiating between XMI-1 and XMI-2 backplanes, and detailing the system's functional architecture.
• Diagnostics: Describes self-tests performed at power-up, ROM-based diagnostics (RBDs) with their commands and qualifiers, and the VAX Diagnostic Supervisor (VAX/DS) programs for more in-depth testing, including procedures for booting and running these diagnostics.
• Scalar Processors: Dedicated chapters for the (xyp) (KA62B) and (xrp) (KA64A) CPU options, detailing their physical and functional descriptions, configuration rules, boot processor selection, power-up sequences, self-test results (console display and LED indicators), specific ROM-based and VAX/DS diagnostics, machine check information, console commands, CPU replacement procedures in single and multiple systems, adding new processors, EEPROM patching using EVUCA, and internal registers.
• Vector Processor: A chapter on the (xrv) (FV64A) vector option, focusing on its physical description, configuration rules with the scalar processor, functional description, self-test results, vector-specific diagnostics, and replacement procedures.
• Memory: Details the MS65A ((xma2)) memory module, covering its physical aspects, configuration rules, system interleaving requirements, addressing, self-test and error interpretation, ROM-based memory diagnostics (RBD 3), and control/status registers. It also discusses mixing MS65A with MS62A modules.
• I/O Adapter: Describes the DWMBB ((xbi_plus)) I/O adapter, including its physical layout, configuration rules, functional description, and relevant ROM-based diagnostics (RBD 2).
• Appendices: Provides lists of console error messages for both Model 300 and 400, information on EEPROM mismatches and the UPDATE command, and control flags for system booting.

The manual also emphasizes proper handling procedures for sensitive modules and includes troubleshooting flowcharts.