PDP11/20 RS64 disk file maintenance manual

This manual provides comprehensive instructions for the interfacing, installation, operation, and maintenance of the Digital Equipment Corporation (DEC) RS64 Disk File. It is intended for maintenance personnel with a foundational understanding of disk files.

The document details the RS64 Disk File as a fast, random-access storage unit offering up to 1,280,000 bits of storage, with the capability to expand to 5,120,000 bits when up to four units are connected to a single controller. It is designed for standard 19-inch rack mounting and comprises two main assemblies: the RS64M Disk Assembly (containing a 10-inch nickel-cobalt plated disk with 32 fixed read/write heads, self-synchronizing clock, and write protection) and the RS64P Power Control and Logic Assembly (including logic modules, control panels, and a power supply).

Key sections cover:

• Installation and Operation: Procedures for unpacking, mechanical installation, power requirements (115V/230V models), signal connections, system checkout, preparation for moving, and operational instructions for controls like unit selection and write lockout.
• Theory of Operation: Explains system relationships, disk surface and track arrangements (including timing and data tracks), functional block descriptions, and detailed descriptions of various modules such as read amplifier-peak detectors, disk writers, series switches, terminators, and the phase-locked clock.
• Interfacing: Defines the bus voltage spectrum, bus philosophy, specific interface signals, format requirements (e.g., NRZI recording, disk speed, synchronization patterns), and the logic for write and read synchronization.
• Maintenance: Offers guidelines for general and preventive maintenance, lists recommended test equipment, outlines corrective maintenance procedures (including power supply and read amplifier adjustments, timing track rewriting), and details the removal and replacement of the disk assembly and recommended spare parts.

Appendices further elaborate on the RC11 format, the RS64 timing track writer, and the power supply specifications and adjustments.