PDP-11/94-E System User and

This document serves as a comprehensive user and maintenance guide for the Digital Equipment Corporation PDP-11/94-E computer system. It provides detailed information on the system's installation, operation, troubleshooting, and field-replaceable unit (FRU) replacement procedures.

Key aspects covered include:

• System Overview: A general description of the PDP-11/94-E, its components (KDJ11-E CPU, KTJ11-B UNIBUS Adapter, etc.), features (DCJ-11 microprocessor, memory, TOY clock, serial line units, floating-point accelerator), system configurations, specifications, and related documentation.
• Installation: Instructions for site preparation, unpacking, and installing the system, including connecting terminals and power, managing cables, and performing initial operational checks.
• Operation: A detailed explanation of the front panel controls and indicators, console/serial line unit (SLU) panel switches, and the use of the ROM code's diagnostic, boot, help, list, map, setup, and TOY commands.
• Configuration: Guidance on configuring the backplane, KDJ11-E CPU module, KTJ11-B UNIBUS Adapter module, minimum load module, and power supply, including jumper and switch settings.
• Functional Description: An in-depth look at the major logic elements, including the PMI Bus protocol, memory management (registers, relocation, cache), general purpose registers, various status and control registers, stack limit and kernel protection, and trap/interrupt service priorities.
• Diagnostics and Troubleshooting: Guidelines for identifying and resolving system issues, using diagnostic programs, interpreting LED display messages and error codes, and utilizing various troubleshooting aids.
• Removal and Replacement Procedures: Step-by-step instructions for removing and replacing all field-replaceable units (FRUs).
• Upgrading: Procedures for upgrading existing PDP-11/84-A and PDP-11/84-E systems to a PDP-11/94 configuration.
• Appendices: Supplemental information on setup parameters, backplane pin assignments, optional battery backup unit installation, hardware/software differences between PDP-11/94 and PDP-11/84, optional expander cabinet installation, and detailed CPU and floating-point instruction timing.

The guide is intended for Digital Customer Services personnel and qualified customers performing self-maintenance.