TU80 Subsystem User Guide

This document is the TU80 Subsystem User Guide by Digital Equipment Corporation, published in 1983. It serves as a comprehensive manual for installing, accepting, and operating the TU80 Magnetic Tape Subsystem.

Key aspects of the TU80 Subsystem:

• It is a low-cost, dual-speed, 9-track tape data storage system.
• It utilizes microprocessor-based electronic control systems and streaming techniques for high data transfer rates and reliability.
• Data is written and read in ANSI-compatible phase-encoded (PE) 9-track 1600-bit/inch format.
• It operates at 25 inches/second (in/s) in Start/Stop mode and 25 or 100 in/s in Streaming mode.
• The system consists of a standalone tape transport and a UNIBUS adapter module (M7454) designed for UNIBUS-equipped PDP-11 and VAX processors.
• A notable design feature is the absence of a capstan, tension arms, or vacuum columns; instead, it uses a microprocessor-controlled servo for direct motor control to maintain tape speed and tension.

The User Guide is structured into six chapters covering:

1. Introduction: General functional and physical description, system overview, and basic specifications.
2. Operating Instructions: Details operator controls, indicators, routine fault-free operation, and initial corrective actions.
3. Customer Diagnostics: Provides troubleshooting information, diagnostic tests, and fault codes.
4. Care and Preventive Maintenance: Outlines customer responsibilities, magnetic tape care, and maintenance procedures.
5. Programming: Describes TU80 programming concepts, registers, and data processing flow.
6. Installation: Covers unpacking, mechanical and electrical installation, cabling, and acceptance test procedures.