KL10 BlockDiagrams May76

This document is a "KL10 Field Maintenance Print Set Supplement" published by Digital Equipment Corporation in May 1976.

Its primary purpose is to supplement the main KL10 Field Maintenance Print Set by providing various block diagrams. These diagrams are drawn from KL10 Technical Descriptions and are explicitly stated to be "not under ECO control" and for "informational purposes and subject to change without notice."

The supplement contains detailed block diagrams for DECSYSTEM-20 and DECsystem-1080 computer systems, illustrating their architecture and interconnections. Key areas covered include:

• Overall System and Main Processor Subsystem: High-level and detailed views of the DECSYSTEM-20 and DECsystem-1080, including MA20 Internal Memory and Memory Controller.
• Major Functional Units: EBox (Functional Block Diagram, RAM Structures, Data and Address Paths, Control), MBox (Overall Block Diagram, RAM Structures, Functional Block Diagram, Address and Data Path, Control Logic, Cache Cycle Control, Channel RAM Cycle Control).
• Interfaces and Channels: Composite Interface, Front End Channel, RH20/Massbus Drive, DTE (Simplified Functional, Control, Address and Data Paths, Detailed Control, EBus and EBuffer Mixers, Ten-Eleven Interface).
• Memory Management: MA20 Module Utilization, Memory Selection (4-Way, 2-Way Interleave, Non-Interleave Modes).
• Timing Diagrams: MA20 SBus Write, Read, and RMW Timing Diagrams.

The document provides a visual reference for understanding the complex internal structure and operation of the KL10 series systems for maintenance and diagnostic purposes.