I am curious if anyone knows what check sum algorithm was used during the NES era. I have noticed that some NES protos have check sums right on the EPROM. Check out the link below if you are curious what I am talking about. I know that these check sums were not created with md5 which is the one that I use. Does anyone know which one was used? It would have been nice if more developers would have done this as would tell us if we have a good dump with no degradation.