Data Multiplexer DM01 Instruction Manual

Summary

The DM01 Data Multiplexer is a switching device manufactured by Digital Equipment Corporation designed to connect a PDP-8 computer with up to seven high-speed peripheral or I/O devices (such as magnetic tape systems, drum memories, and CRT displays).

Key functions and details include:

• Purpose: It enables multiple peripheral devices to utilize the PDP-8's "data break" facility, allowing for high-speed data transfers.
• Operation: The manual describes the logic circuitry responsible for multiplexer control, addressing, and data line selection. It details how the DM01 receives "break requests" from peripheral devices and manages priority among them to allow the PDP-8 to communicate with the selected device.
• Maintenance: The document provides preventive and corrective maintenance guidelines, including voltage checks for the required Type 728 Power Supply and a table for semiconductor substitution.
• Installation: The unit is 10.5 inches high and is designed for mounting in a standard 19-inch rack. It is specified to operate within a temperature range of 32° to 130° F (0° to 55° C).
• Technical Documentation: The final chapter contains detailed engineering schematics and connection diagrams for the multiplexer's logic modules, interconnecting cables, and I/O connectors.