============================================================================= AST RESEARCH, INC. TECHNICAL BULLETIN #0768 07-23-92 ============================================================================= AST PREMIUM II 386/33 AND TORUS ETHERNET ADAPTER PROBLEM: When using the AST Premium II 386/33 with the Torus Ethernet Adapter in a Microsoft LAN Manager 2.X environment, the system will fail to map drives or access files on the file server and will display the error message "DOS Error 5." CAUSE: The Torus Ethernet is a bus-mastering card that is not compatible with the Premium II, Premium CLEM, and Bravo 486 series of computers. AFFECTED SYSTEMS: AST Premium II systems. AST Premium CLEM systems. AST Bravo 486 systems. SOLUTION: AST Sustaining Engineering has determined that this problem will not be fixed. AST suggests using an alternate network interface card.