Fixed-Head Disk System

This document is a maintenance manual for the RJS04 and RJS03 Fixed-Head Disk systems, specifically detailing the integration and maintenance of the RH11 controller and associated disk drives within a PDP-11 computer system. It covers:

• System Overview: Describes the hardware components including the RH11 controller, Unibus, and Massbus interfaces.
• Theory of Operation: Provides detailed explanations of the register control path, DMA data path, and various operational modes (Write, Read, and Write-Check).
• Operation and Programming: Documents the device registers, their bit assignments, and programming requirements.
• Detailed Logic: Includes comprehensive descriptions of the logic diagrams and timing sequences for various controller functions.
• Installation and Maintenance: Details mechanical and electrical installation procedures, diagnostic tests (such as basic function and data reliability tests), and maintenance routines.