BA11-K Mounting Box User's Manual

This document is the BA11-K mounting box user's manual by Digital Equipment Corporation (DEC), published in December 1976.

It describes the BA11-K, a 10-1/2 inch, 19-inch rack-mountable expander box designed to house and expand PDP-11 computer systems. The manual details its modular design, allowing it to accommodate various DEC standard system units (like memory, peripheral controllers, and other options) for flexible configurations.

Key information covered includes:

• Characteristics and Specifications: Physical dimensions, environmental requirements, and detailed electrical specifications for both 115 Vac (BA11-KE) and 230 Vac (BA11-KF) versions, including input power, output power, and power-up/power-down characteristics.
• System Unit Configuration: How the BA11-K can accept up to five system units (single or double), Unibus pin assignments, and general guidance on option configurations and their power requirements to ensure the H765 power system's capabilities are not exceeded.
• Installation Information: Comprehensive instructions for unpacking, installing the unit into a cabinet (including slide mounting specifications), connecting the AC power supply (with emphasis on proper grounding and power quality), and routing Unibus and communication cables to prevent interference and maintain airflow.
• Remote Power Control: Methods for controlling the BA11-K's power via a key switch or external power controller.
• Installation Certification: A recommendation to run system diagnostics after installation to confirm correct operation.

The document provides essential technical specifications, diagrams, and installation procedures for setting up and configuring the BA11-K mounting box within a PDP-11 system.