MB20 Internal Memory

This document provides a comprehensive technical guide to the MB20 internal memory unit designed for the KL10 system. It is divided into three main sections:

• Overview: Details the physical organization of the memory system, including controllers and storage modules, and summarizes basic read, write, and diagnostic operations.
• Functional Description: Explains SBus communication, memory addressing interleaving modes (4-way, 2-way, and no-interleave), and controller/storage module sequences of operation.
• Logic Description: Offers a circuit-level analysis of the controller (M8568/M8565) and storage modules, providing detailed information on diagnostic cycle control, error logic, and margin control.

The manual also includes detailed timing diagrams, signal definitions, and appendices for abbreviations.