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]