Preliminary HSC50 Host Interface Specification

This document, labeled as a preliminary specification (Version 0.9, dated July 1979), outlines the interface between a host computer and the HSC50 controller. It details the functional responsibilities of both the host and the controller, the control packet and data transport mechanisms, and the overall control protocol. The document provides specific information regarding initialization procedures, error recovery, logical unit states, and the various command types and their formats available for the HSC50 system.