MicroVAX 3100-90 and VAX 4000-100 Information Sheet

This document outlines the required maintenance procedure for technicians replacing the CPU module (54-21797-01) in MicroVAX 3100-90 (47ZBM-A9/B9) or VAX 4000-100 (47DBM-B9) systems. It specifies that spare CPU modules arrive pre-configured as a KA52-AA, necessitating manual firmware reconfiguration at the console if installing into a system that requires a KA50-AA. The document provides the specific console commands (>>>T 9D 50 for KA50-AA and >>>T 9D 52 to reconfigure to a KA52-AA) needed to ensure correct system operation.