Required Microcode Fix for ULTRIX Based System

This FCO provides instructions for updating the microcode on the KDB50 disk controller module to resolve reported issues. It is mandatory for all VAXBI systems running the ULTRIX operating system.

Key steps include: - Verification of the current T1002 module revision (must be 'D' or higher, or replaced). - Procedures for system shutdown and safe removal of the T1002 module. - Detailed instructions for replacing six PROMs on the module using ESD-safe equipment. - Verification via self-test and Level 3 diagnostic tests (EVRLF and EVRLJ). - Necessary system re-initialization and LARS form completion.

The document includes specific installation and testing procedures for VAX 8500/8700/8800 and VAX 8200/8300 systems.