PDP-11/70 Maintenance and Installation Manual

This document is the PDP-11/70 maintenance and installation manual by Digital Equipment Corporation, published in May 1979 (2nd Edition). It serves as a comprehensive guide for installing, configuring, and maintaining the PDP-11/70 computer system and its associated peripherals.

The manual covers:

• System Description and Specifications: Details the basic system components, cabinet configurations (processor and memory cabinets), and technical specifications including electrical (power requirements, heat dissipation), mechanical (dimensions, weight), and environmental conditions for the CPU, memory, and various peripheral devices like magtape and disk drives.
• Installation Procedures: Provides extensive guidance for site preparation, including physical dimensions, fire/safety precautions, environmental requirements (humidity, temperature, air-conditioning, static electricity), and electrical setup (grounding, AC power checks). It outlines steps for assembling and cabling the system, and performing initial system checkout using bootstrap modules and diagnostics.
• Power System: Dedicates a significant portion to the AC and DC power distribution, detailing the 861 Power Control units, H7420, MJ11, and MK11 power supplies, and their respective voltage regulators. This section also includes detailed maintenance procedures for power components, covering troubleshooting, voltage adjustments, and subassembly removal.
• Maintenance and Troubleshooting: Describes systematic approaches to diagnose system faults, including cold start procedures and the use of on-line diagnostics. It elaborates on various troubleshooting aids such as CPU and memory registers, indicators, switches, and test points. A wide array of diagnostic programs for the CPU, cache, memory management, Unibus map, and different peripheral controllers (disk, tape) are listed and briefly explained.
• Appendices: Offer supplementary information on module and IC removal/replacement, equipment configuration labels, detailed IC descriptions, preventive maintenance schedules, cable trough systems, and comprehensive block diagrams of address and data paths.

In essence, the manual provides the necessary technical information and step-by-step instructions for the complete lifecycle management of the PDP-11/70 system, from initial setup to ongoing maintenance and repair.