RA90/RA92 Disk Drive

This document serves as the official user guide for the Digital Equipment Corporation RA90 and RA92 disk drives. It details the technical specifications, physical characteristics, and site preparation requirements necessary for successful installation, including environmental and power considerations. The manual provides step-by-step operating instructions for the Operator Control Panel (OCP), including powering on, performing acceptance tests, setting the unit address, and utilizing different operating modes. Furthermore, it covers diagnostic procedures, including both power-up and manual resident diagnostics, and concludes with customer equipment maintenance responsibilities and logging procedures.