Microsoft Backup for Windows Fails on Ambra 90 MHz PCI Systems


   Problem: While performing a compatibility test with MWBACKUP on the
            Ambra DP90PCI and TP90PCI, the following error message appears:

            "Write error occured on Drive A. This Diskette is Defective.
            Please replace the Diskette to continue."

            The system will also fail at compatibility speed.

Discussion: MWBACKUP is Microsoft's Windows based backup program. It is
            installed with all systems that have DOS 6.2 installed. The
            program uses a special mode (demand mode) DMA to the floppy
            drive. This mode does not work with the Intel chipset on the
            AMBRA DP90PCI and TP90PCI.

  Solution: There is a file available from Microsoft called MWBACKF.DLL
            that will turn off the DEMAND mode DMA that is included in
            this zipfile. Copy this file to the directory (usually DOS)
            that contains the MWBACKUP command.
            
           

