This topic has gone over the list a few times, from
experience, the "best"
scans are 600 DPI black and white compressed into PDF files. This achieves
exactly what is needed, get the data without a lot of excess. The KA655 TM
I know in my case the max I can manage is 300dpi optical, but that will
produce a usable document as long as it doesn't include circuit diagrams.
Zane