[cctalk] Any Interacts out there? 1978, 8080-based system

Checking on if anyone has an old Interact system out there. It wasn't widely successful, but gained some popularity around Ann Arbor, MI. I've not come across one of these yet. But I've come across one of its "Killer Application", a tape-based program called Message Center that lets users construct banner message scripts with a few video/audio effects. Would be interested to see this "for real" rather than just in the MAME emulator. Or also to hear any stories about the system, such as anyone who actually used one, or saw one being used at a storefront? -Steve