Extremely Slow Performance without Diagnostic Failure

This document describes Field Change Order (FCO) PMAG-DB-F001, which addresses an issue where Turbochannel systems equipped with PMAG-DB (Low 3D) graphics options built before May 1991 exhibit extremely slow performance. The problem arises because the N10 module can erroneously respond to DMA error signals from other system engines, causing the system to hang. This is especially problematic in 3MIN configurations. The FCO involves upgrading the affected graphics boards to a current revision to isolate these DMA errors. The document includes criteria to check if the FCO is needed, installation procedures, and required reporting information for the LARS system.