MicroVAX 3100 Model 40/80 to Model 85 CPU Upgrade Guide

This document is a CPU Upgrade Guide for the MicroVAX 3100 system, detailing the process of converting a Model 40 or Model 80 to a Model 85 by replacing the existing CPU module with a KA55 module and installing new SIMMs.

Intended for Digital services personnel and licensed self-maintenance customers, the guide outlines a comprehensive conversion process which includes:

1. Pre-installation preparations: Backing up system software and ensuring the OpenVMS operating system is at version 5.5-2H4, 6.1, or higher.
2. Hardware replacement steps: Detailed instructions for disassembling the MicroVAX 3100 enclosure, removing internal components (like drive shelves, old CPU, and old SIMMs), installing the new KA55 CPU module and 64-Mbyte SIMMs, reconnecting all cables, and reassembling the system.
3. Post-installation tasks: Reinstalling system software (if necessary), applying new product labels and a medallion, and completing mandatory return forms.
4. Mandatory Return Procedure: A critical section detailing the steps for returning the original CPU module and SIMMs to Digital Equipment Corporation, emphasizing that this return is a condition of sale and failure to do so will result in a penalty charge.

The guide stresses the importance of anti-static precautions during hardware handling and provides various forms for documentation and return processing.