Extremely Slow Performance without Diagnostic Failure

This document outlines a Field Change Order (FCO) for the PMAG-EB (Mid 3D) graphics option. The FCO was issued to address an issue where unisolated DMA errors on early-build modules could cause the N10 processor to hang, resulting in extremely slow system performance without triggering diagnostic failures. The FCO is implemented on an 'as needed' basis for systems built prior to May 1991, primarily affecting 3MIN and 3MAX configurations using specific add-on options like FDDI. The document provides instructions for installation, which involves replacing the affected Turbochannel module.