ISA Bus Network Adapter Cards

This document outlines the Field Change Order (FCO) FR-830xx-0001 for resolving signal integrity problems on the ISA bus in certain Celebris Pentium systems (Celebris 560, 590, and FP 590). These issues can cause network adapter diagnostic failures, connection losses, or intermittent floppy drive errors when specific cards are installed. The solution requires replacing the main logic board (MLB) with a 54-23544-04 Rev J01 or later version and updating the system BIOS to version V1.03. Detailed instructions are provided for safety precautions (ESD), hardware replacement, BIOS flashing, and post-installation diagnostics.