VAXstation 2000 and MicroVAX 2000

This document is a Field Maintenance Print Set for the Digital Equipment Corporation MS400 product, copyrighted 1987.

Its primary purpose is to provide comprehensive technical information regarding memory upgrades and options for the MS400, specifically detailing the 2 MB (MS400-AA) and 4 MB (MS400-BA) memory configurations.

The print set includes:

• A Table of Contents for various related documents (Memory Upgrade, 2/4 MB Memory Option).
• Detailed Parts Lists specifying components like 256K DRAM chips, connectors, and integrated circuits.
• Circuit Schematics illustrating the memory chip connections (e.g., to MDAL and PBIT lines) and associated circuitry.
• Board Layouts (Side 1 and Side 2 views) of the memory option board.

The document emphasizes that all memory chips are connected to +5VB and organizes the memory architecture into distinct "banks" and "bits." It is a confidential and proprietary work of Digital Equipment Corporation.