OMG I got it to work... There was a small problem with my program. I think pretending to have a conversation with people helped! :lol: It is indeed retrieving 16 bits at a time for the checksum.

I didn't give anyone a chance, it all happened so fast.

I'm going to try to generalize this program so it can be used to verify any ROM against the recorded checksum. The source code is being written in C++.