RH750 Field Maintenance Print Set

This document is a "Field Maintenance Print Set" for the Digital Equipment Corporation RH750 system, specifically the RH750-A model and its Massbus Adapter (MBA).

The comprehensive set of prints and directories provides detailed technical information essential for system maintenance and understanding its architecture and operation. Key contents include:

• Administrative & Navigational: A detailed "Table of Contents," "Drawing Directories" (listing all included prints by number and description), and "Forward Reference" sections (acting as signal indexes to corresponding schematic pages).
• Hardware & Assembly Details: "Parts Lists" (Bill of Materials) for the RH750 and MBA, "Unit Assembly" drawings, "Etch Cut Drawings" for circuit boards, and "Cable Assembly" diagrams.
• System Architecture & Logic: High-level "Block Diagrams" for the RH750 (showing components like Silo Control, Register Control, MBA-CMI Interface, and Data Bus Control chips), detailed "Flow Diagrams" illustrating operational processes (e.g., read/write, write check, CMI slave operations), and extensive "Circuit Schematics" covering various functional blocks within the Massbus Adapter (e.g., data buffer, variable and clock control, interrupt control, Massbus transceivers, data path logic, control bits, parity, power/ground decoupling).
• Firmware: A "PROM Listing" is also indicated in the table of contents.

The document is copyrighted 1981 by Digital Equipment Corporation, with some sections showing later revision dates, indicating ongoing updates.