PDP-11/45, 11/50, and 11/55 System

This document provides technical instructions and maintenance procedures for the Digital Equipment Corporation PDP-11/45, 11/50, and 11/55 computer systems. The manual is organized into 8 chapters and 3 appendices:

• Chapter 1: General system descriptions, configuration specifications, and reference documents.
• Chapter 2: Site preparation, installation, and initial system test procedures.
• Chapter 3: General power system description.
• Chapter 4: Detailed AC power control and distribution information.
• Chapter 5: DC power distribution and voltage regulator theory/specifications.
• Chapter 6: Maintenance procedures including preventive maintenance, diagnostic programs, and integrated circuit replacement techniques.
• Chapter 7: Installation procedures for plug-in card options (FPP, memory management, semiconductor memory).
• Chapter 8: System unit options and expansion cabinets.

It includes detailed illustrations and tables for power configurations (H7420 and H742), voltage distribution, and diagnostic programs.