Dectape Transport Type TU55 Control Type TC01

Summary

This document provides technical specifications and operational instructions for the Digital Equipment Corporation (DEC) DECtape system, comprising the TU55 Transport and the TC01 Control.

Key features and functionality include:

• System Overview: The system is a bidirectional, magnetic-tape data storage device designed for high reliability and convenient data access. It utilizes a simple transport mechanism without capstans or pressure pads to minimize tape and head wear.
• Data Formatting: The system uses a fixed-position addressing scheme with prerecorded timing and mark tracks, allowing for variable-length blocks and efficient data retrieval. It supports bidirectional reading, writing, and searching.
• Technical Architecture: The TC01 Control manages up to eight TU55 transports. Data is transferred to the computer in parallel 12-bit words, utilizing block transfer control to maintain high-speed operations.
• Programming and Software: The document details the PDP-8 DECtape Library System, which includes subroutines for data storage, maintenance, and diagnostics. It also provides a comprehensive instruction list (e.g., DTRA, DTCA, DTXA, DTRB, DTLB) for controlling the system via the computer.
• Operational Modes: The system supports various modes, including Normal Mode and Continuous Mode, with specific functions such as "Search," "Read Data," and "Write Timing and Mark Track" to facilitate flexible data management.
• Specifications: Detailed physical and electronic specifications are provided, including power requirements, tape handling characteristics, connection details, and compatibility information for integration into standard DEC computer cabinets.