Rl01/Rl02 Disk Controller

This document contains a comprehensive set of schematic diagrams for the Digital Equipment Corporation M8433-0-1 RL01/RL02 Disk Controller board. The technical package includes:

• Component Layout: A detailed map showing the physical placement of all integrated circuits (ICs) and components on the circuit board.

• Detailed Schematics: Ten pages of logic diagrams illustrating the control circuitry, including:

  • I/O and register controls.
  • Data break, status flags, and interrupt gates.
  • Read/Write silo operations.
  • CRC check generation and write precompensation.
  • Micro-controller ROM and address control logic.
  • Data separator and phase-locked loop (PLL) circuitry.
  • Bus drivers and receivers for interface connectivity.

• Technical Notes: Supplemental information regarding jumper configurations for device priority, ROM types, and operating modes to ensure compatibility between different hardware revisions and installation requirements.