PDP-11/70

This document is the official maintenance and installation manual for the Digital Equipment Corporation PDP-11/70 system. It covers:

• General Description: System components, block diagrams, and reference documentation.
• Specifications: Electrical, mechanical, and environmental requirements for the processor, memory, and peripheral devices.
• System Installation: Site preparation (physical layout, electrical requirements, safety) and field installation procedures.
• Power System: Detailed descriptions of power distribution, H7420 power supplies, 861 power controllers, and maintenance/troubleshooting of power subassemblies.
• Maintenance: Troubleshooting guidelines, system diagnostic procedures, and maintenance aids for the CPU, cache, memory, and Unibus components.
• Appendices: Detailed module replacement, IC descriptions, and cable routing procedures (wire trough system).

The manual includes extensive tables and figures for technical specifications, diagnostic error codes, and schematics.