VAX 4000 Model 100/100A Upgrade to Model 105A

This document, "VAX 4000 Model 100/100A Upgrade to Model 105A," is a manual providing detailed step-by-step procedures for upgrading VAX 4000 Model 100 and Model 100A systems to a VAX 4000 Model 105A. The core of the upgrade involves replacing the existing KA52 CPU module with a new KA53 CPU module.

Key aspects of the document include:

1. Purpose: To guide Digital Services personnel and licensed self-maintenance customers through the hardware and software conversion process.
2. Scope:
   • Model 100 Upgrade: This involves upgrading the VMS operating system (to 5.5-2H4 or 6.1), replacing the port cover, replacing the CPU module, and installing a new system medallion.
   • Model 100A Upgrade: This is a simpler process as VMS and firmware upgrades are not required (factory installed versions are compatible), focusing primarily on replacing the CPU module and installing a new system medallion.
3. General Procedure: Both upgrade paths involve customer software backup, unpacking the conversion kit, powering down the system, disconnecting external and internal cables, removing components like memory SIMMs, drive mounting shelves, and the old CPU module. New components, primarily the KA53 CPU module, are then installed, followed by reassembly, cable reconnection, and application of new system labels/medallions.
4. Mandatory Return: The document emphasizes the mandatory return of the original CPU module to Digital Equipment Corporation to avoid penalty charges. It includes detailed instructions, forms (Digital Services Worksheet, Installation Receipt, Returned Material Checklist), and contact information for managing the return process.