PDP-11/44 System User's Guide

This document is the PDP-11/44 System User's Guide (EK-11044-UG-003), published by Digital Equipment Corporation in 1980/1981.

It serves as a comprehensive manual for the PDP-11/44 and PDP-11X44 midrange computer systems, providing detailed information necessary for their unpacking, installation, configuration, operation, and maintenance.

Key areas covered include:

• System Overview: General description, standard and optional hardware components (CPU modules, memory, cache, UNIBUS interface, console interface, multifunction module), and detailed equipment specifications (mechanical, environmental, and electrical).
• Operation: Guidance on using the front control panel and console commands (e.g., BOOT, EXAMINE, DEPOSIT, HALT, START), along with descriptions of command qualifiers and the functions of various system registers (CPU, Multifunction Module, Cache Memory, Memory Management).
• Configuration: Details on CPU backplane assignments, module current requirements, and instructions for setting switches and jumper leads on various modules (Console Interface, Multifunction, UNIBUS Interface, Cache Memory, Control) for specific system requirements, including diagnostic and bootstrap loader ROMs.
• Installation: Site considerations (temperature, humidity, static electricity, electrical interference), unpacking procedures, equipment dimensions, AC input power requirements, system grounding, and mounting procedures for installing the unit into cabinets or racks.
• Removal/Replacement Procedures: Instructions for maintaining the system by removing and replacing main units and assemblies like the mounting box, fan assembly, power supply, and for installing optional backplanes for system expansion.