MP01331 UDA50 EngrDrws

This document is a Field Maintenance Print Set for the Digital Equipment Corporation (DEC) UDA50 Unibus Disk Adapter, covering unit variations UDA50-00 and UDA50-A.

Published by DEC with original copyright from 1982 (and containing revisions into the early 1990s), this comprehensive set is designed for field maintenance and troubleshooting. It includes:

• Table of Contents: An organized index of all included drawings.
• Assembly Diagrams: Visual representations of the adapter's physical construction and component placement.
• Parts Lists: Detailed breakdowns of components for various sub-assemblies (e.g., UDA #1, UDA #2, UDA PR - Processor, UDA SI - System Interface), including part numbers, descriptions, and quantities.
• Rework Instructions: Specific procedures for modifications, component replacements, and repairs.

• Extensive Circuit Schematics: Detailed electrical diagrams for key functional blocks, such as:

  • Arithmetic Logic Unit (ALU)
  • Clocking mechanisms
  • Signature Analyzer Control and Branching logic
  • PROM (Programmable Read-Only Memory) and Logic Analyzer Connectors
  • Unibus Interface, including data, address, control, interrupt, and NPR (Non-Processor Request) sections
  • Data Bus Connectors
  • Buffer Memory and SERDES/ECC (Serializer/Deserializer / Error Correction Code)
  • Real Time Controller Status (RTCS) and Real Time Drive Data (RTDS)
  • WCD Encoder (Write/Command Data) and RRD Decoder (Read/Response Data)
  • Voltage Regulators (-5.2V).

• Technical Notes and Disclaimers: Important information regarding dimensions, tolerances, component handling procedures, and proprietary rights.

The document serves as a complete technical reference for maintaining and servicing the UDA50 disk adapter.