TU56 DECtape Transport

This document provides detailed information on the TU56 (Dual) and TU56H (Single) DECtape Transport units. It covers general system information, specifications, installation procedures, and a deep dive into the theory of operation regarding the tape motion system, interface, and read/write processes. The manual includes extensive maintenance guidance, including both preventive and corrective procedures such as reel motor replacement and read/write head skew adjustments, alongside troubleshooting tables and reference diagrams for various modules.