TU58 Engineering Specification

This document is the engineering specification for the Digital Equipment Corporation TU58, a mass memory storage subsystem. The TU58 is designed as a low-cost device that utilizes 3M DC-100A cartridges, which are preformatted to store 2048 records of 128 bytes each. The specification details the physical configuration, including available serial and parallel controller modules, as well as the mechanical dimensions for drive modules and rackmount units. Furthermore, the document defines the interchange compatibility, the recording scheme, and the software interface using the Radial Serial Protocol (RSP), including command packet structures and instructions for read, write, and diagnostic operations.