RL11 Controller Technical Description Manual

This document describes the RL11 Controller, a Small Peripheral Controller (SPC) used to interface up to four RL01 or RL02 Disk Drives to a PDP-11 UNIBUS system. The manual details:

• Subsystem Overview: Includes functional capabilities, media specifications, and drive interface descriptions.
• Programming Information: Explains the eight controller functions (Read, Write, Seek, Get Status, etc.) and the four addressable registers (CSR, BAR, DAR, MPR).
• Interface Descriptions: Details the UNIBUS interface (slave and bus master modes) and the Drive I/O bus.
• Functional Logic: Explains internal components, including ROM-based control (Function and Format ROMs), silo buffers, and CRC logic.
• Special ICs: Includes specifications for UNIBUS transceiver chips (DC005, 8641, 8647).