> After reading this again I wonder...if the datasegment is identical while the
> load/play/init address can vary (e.g. because it was fixed), why isn't a skip
> 0x80 byte simple header check enough? Sample plain data, same checksum, ignore
> stuff from the header completely....or do I miss something here?

I've been pondering this as well. Where does the data actually begin if the header can make a noticable difference in some of these files? When I originally started working on this detector, my goal was to filter out all the duplicates that have different labels. I didn't expect these kinds of results, so I think I'll need to take a closer look at some of these dupes.

In any case thanks for the help. I'm going to rexamine some of these duplicates side-by-side and see what I can make out. I'll keep you posted.