Hi Lou, It is possible that the HP-7400A isn't on the scanner list. There is a complete list of usable scanners on the Freedom Scientific website. Don't expect a newer model to work, it might not. I got a newer one and it would only scan one page and I would have to turn off Open Book and restart it again. That isn't any way of scanning. Walt WA4QXT New London CT [log in to unmask]