Norton Backup & Windows 3.1 Compatibility Tips The Norton Backup for Windows 1.2 and the Norton Backup for DOS 2.0 are fully compatible with Microsoft Windows version 3.1. However, you need to ensure that the built-in Windows 3.1 virtual DMA driver, VDMAD, is installed. Simply edit the Windows SYSTEM.INI file and, in the 386 Enhanced section [386Enh], add the line device=*vdmad and remove the line device=vdmadx.386 and save the changes. You must restart Windows for the changes to your SYSTEM.INI file to take effect. If the correct device driver is not in place, the Norton Backup will run correctly, but not at the fastest possible speed. Norton Application Note Rev. 6/92 #4101 Page 1 of 1