DECtape Dual Transport

This document describes the Digital Equipment Corporation (DEC) DECtape Dual Transport Model 555. It covers:

• Introduction and Description: Details of the transport mechanism, tape characteristics, bidirectional operation, and Manchester phase recording system.
• Theory of Operation: Functionality of the motor drive system, motion control relay network, and logic for automatic and manual operation.
• Operation: Control usage, including manual and automatic modes, and tape loading procedures.
• Maintenance: Field adjustment procedures for stop timing, as well as cleaning and connector maintenance guidelines.
• Engineering Data: Includes a wiring diagram (D-25326) in the appendix for reference.