TU55 DECtape Transport

The TU55 DECtape Transport Maintenance Manual provides a detailed technical overview and maintenance guide for the TU55 transport unit. The document is structured into two main chapters: Chapter 1 covers introduction and description, including general and functional descriptions, physical specifications, and performance characteristics. Chapter 2 details the theory of operation, which covers the block diagram analysis, interface signals (such as unit select and command lines), read/write head operation, tape motion and motor control, and specific module descriptions for components like the R303, W513, and G850 modules.