Data Multiplexer DM01 Instruction Manual

This document serves as an instruction manual for the maintenance of the Digital Equipment Corporation (DEC) Type DM01 Data Multiplexer.

Key points include:

• Purpose: The DM01 functions as a switching device to connect up to seven high-speed peripheral devices (such as magnetic tape systems, drum memories, or CRT displays) to a PDP-8 computer using the data break facility.
• Logic Operation: The manual details the control logic used to manage data break requests, including address selection, data bit selection, and timing coordination between the PDP-8 and the connected peripherals.
• Maintenance: Preventive maintenance is guided by the PDP-8 Maintenance Manual (F-87). Specific procedures for checking the Type 728 Power Supply are included, detailing voltage outputs and ripple tolerances. Corrective maintenance is primarily performed by module replacement.
• Installation: The unit is designed for a standard 19-inch rack, with operating temperature specifications ranging from 32°F to 130°F (0°C to 55°C).
• Technical Data: The manual contains a comprehensive set of schematics, connector diagrams, and a semiconductor substitution table for maintenance and troubleshooting.