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I am looking at doing an upgrade of an old Wonderware system that is connected to an existing Moore APACS DCS. The workstations are Windows 3.1, and the Wonderware is version 5. We need to go to WinXP Pro and Wonderware 9. I have a lot of experience with Wonderware, and I can handle the application conversion and any I/O driver configuration, but I understand that special hadrware is needed to interface Wonderware to APACS. Could someone fill in the blanks for me with some details, or direct me to a site that includes some information?