Core Memory

This document is a field maintenance print set for the Digital Equipment Corporation MA20 Core Memory. It contains detailed documentation including:

• Module Utilization: A comprehensive list of modules (Print Sets) for the system.
• Flow Diagrams: Logic flow for the controller, diagnostic cycles, and power up/down sequences.
• Interconnection Block Diagrams: Detailed wiring diagrams illustrating the connections between memory controllers, storage modules, and timing modules.
• Instruction and Setup Charts: Procedures for configuring the hardwired controller and the MA20 deskew procedure.
• Timing Diagrams: Detailed signal timing for Interleave Mode 3.
• Component Schematics: Detailed circuit schematics for 16K X-Y Drive (G235), 16K Sense/Inhibit (G114), and Control Logic boards (M8561).

The document provides the necessary technical specifications and maintenance logic for servicing the MA20 memory system.