VAX 11/750 Self Maintenance Diagnostic Guide

This document, titled "VAX11/750 Self Maintenance Diagnostic Guide" (EK-750YA-UG-001), published by Digital Equipment Corporation in February 1981, serves as a quick reference for diagnosing hardware problems on the VAX-11/750 computer system.

The guide is designed to provide essential diagnostic information without detailing repair procedures. It covers:

• System Operation: VAX-11/750 operating states, keyswitch positions, and front panel light indicators.
• Diagnostic Commands: Detailed lists of commands for the Diagnostic Module (DM) and Micro-diagnostic Monitor (MICMON), as well as VAX console commands, including their modifiers, switches, and usage examples. (Note: DM-specific content applies only to systems equipped with the KC750-YA option).
• Error Codes and Messages: Extensive definitions for various errors, such as DM error messages, console command errors, console halt errors, power-up terminal display formats, microverify codes, and primary boot failure codes.
• System Internals: Information on the System Control Block (SCBB), special vector bit functions, vector microaddresses, and stack contents on selected VAX exceptions (Machine Check, Arithmetic Trap, Compatibility Mode, Translation Not Valid or Access Violation).
• Processor Registers: A comprehensive listing of VAX-11/750 Internal Processor Registers (IPRs), indicating their addresses, mnemonics, read/write status, and names.

The document also includes figures illustrating the VAX-11/750 front panel, DM operating state transitions, and memory status and control maps.