VAX-11/780 System Maintenance Guide

This document is the "VAX-11/780 System Maintenance Guide," published by Digital Equipment Corporation in December 1978. It serves as a comprehensive single-source summary of troubleshooting, maintenance, operating, and programming information specifically for the VAX-11/780 computer system.

Aimed at Digital's field service, manufacturing, training, and engineering personnel, the guide provides detailed information across various aspects of the system:

• Introduction and Documentation: Lists extensive hardware, peripheral, and software manuals for the VAX-11/780 and related systems (e.g., VMS, PDP-11, FORTRAN, COBOL).
• Architecture: Explains the fundamental VAX-11 architecture, covering data types, addressing modes, special register usage, the instruction set, branch conditions, processor register addresses and bit configurations, system and process control blocks, protection codes, interrupt priority requests, exception conditions, and detailed virtual-to-physical memory address translation schemes.
• Hardware Block Diagrams & Register Bit Configurations: Presents detailed block diagrams and bit-level configurations for the CPU, data paths, instruction handling, control stores, cache and translation buffers, clock module, floating-point accelerator, console subsystem, and various bus interfaces (SBI, QBus, Unibus, Massbus), including bus maps and signal descriptions.
• Configuration & Jumpers: Provides practical, hands-on information for system setup, including module utilization charts, and specific jumper settings for various hardware components like the CPU, memory, and bus adapters (UBA, MBA).
• Microprocessor: Dives into the microcode level, detailing control store field maps, microcode routines that support console software (including starting addresses, branch functions, microtrap vectors), and comprehensive VAX-11/780 system microcode macros and field definitions.
• Troubleshooting Tools & Diagnostics: Offers extensive details on console commands (help files, abbreviation rules, remote access), error message interpretation, and various diagnostic tools and procedures. This includes running microdiagnostics (both stand-alone and under VMS), microdiagnostic monitor commands, pseudo-instructions, and diagnostic supervisor commands.
• System Operation: Outlines practical operational aspects such as the VMS boot procedure, using utilities like Filex for diagnostic file transfer, terminal function keys and commands for communication, file manipulation, device handling, program development, and printing the error log file.
• Conversion Tables & Integrated Circuit Diagrams: Includes a reference section with hexadecimal/decimal/octal/ASCII conversion tables and detailed diagrams (pinouts, logic) for numerous integrated circuits used within the VAX-11/780 hardware.

In essence, this guide is an in-depth technical resource designed to enable comprehensive understanding, configuration, and diagnosis of the VAX-11/780 computer system at both a high-level operational and low-level hardware/microcode perspective.