DEC-11-HRJSA-B-D RJS04 RJS03 fixed-head disk system maintenance manual Aug1974

This document is the RJS04/RJS03 Fixed-Head Disk System Maintenance Manual, published by Digital Equipment Corporation in 1974.

It provides comprehensive information for Digital Field Service and customer maintenance personnel regarding the RH11 Device Controller and the RS04/RS03 Fixed-Head Disk Files.

The manual covers:

• System and Physical Description: Detailing the components of the disk file system, including the RH11 Controller, RS04/RS03 disk files, and their interfaces via the Unibus (to the PDP-11 processor and memory) and the Massbus (to the disk drives). It describes data transfer operations (Write, Read, Write-Check) and data rates.
• Massbus Interface: A detailed explanation of the Massbus's asynchronous control bus and synchronous data bus, including signal lines and command initiation.
• Operation and Programming: Descriptions of the various 16-bit registers (e.g., Control and Status, Word Count, Unibus Address, Desired Address, Error, Maintenance) used to control and monitor the system, along with their bit assignments, function codes (e.g., No-Op, Drive Clear, Search, Write, Read), and interrupt conditions.
• Theory of Operation: In-depth explanation of the RH11's register control path and Direct Memory Access (DMA) data path, including the function of the Silo buffer for managing Unibus NPR latency, and flow diagrams for data transfer operations.
• Detailed Logic Description: A technical breakdown of the RH11's logic diagrams, including bus control (BCT), control and status (CSR), data path routing (DBC), and parity control (PAC) modules, along with timing diagrams and descriptions of various integrated circuits used.
• Installation and Maintenance: Guidelines for mechanical and electrical installation (cabling, power connections, jumper configurations), visual inspection, and diagnostic maintenance procedures (Basic Function Test, Data Reliability, Diskless Diagnostics).

In essence, it's a highly technical guide for setting up, understanding, programming, troubleshooting, and repairing the RJS04/RJS03 fixed-head disk systems and their RH11 controller.