Pdp-8 Dm01 Data Multiplexer

This document serves as the maintenance manual for the Digital Equipment Corporation (DEC) Type DM01 Data Multiplexer. The DM01 functions as a switching interface between a PDP-8 computer and up to seven high-speed peripheral devices (such as magnetic tape systems, drum memories, or CRT displays) that utilize the PDP-8 data break facility.

Key aspects of the manual include:

• Operational Theory: Detailed descriptions of the multiplexer control logic, data address line selection, and data bits line selection.
• Interface and Power: Technical details regarding cable interconnections and the use of the Type 728 Power Supply to provide the required +10 and -15 VDC levels.
• Maintenance: Guidelines for preventive maintenance (including power supply output checks) and corrective maintenance, which relies primarily on module replacement.
• Installation: Physical mounting specifications for a standard 19-inch rack and environmental operating requirements.
• Technical Documentation: A comprehensive collection of schematic diagrams and logic signal descriptions necessary for servicing the hardware.