I'm totally new on ROM hacking and I decided to give it a try by editing some text on a Sega Genesis ROM.
I downloaded WindHex, I loaded a FIFA International Soccer in it, and I messed up the word "Exhibition", writing "Exhibotion" just to see what happens.
I "Save As" the ROM, I load it on Kega Fusion emulator and there comes the "Incorrect Checksum" message.
So, I download ESE Fix Checksum, I load the hacked ROM, I fix the checksum.
I load it on Fusion again, there is no "Incorrect Checksum" or anything, but the game just doesn't start. Only a black screen.
I decide not to mess with checksum, and see what happens. I change the word "Exhibition" to "Fxgibition", so for the total value to remain unchanged.
I load it on Fusion once more, the game won't start.
I try to work on a different ROM, nothing happens; if I change anything, the game won't start. If I edit the very same ROM writing the word to it's original form again (e.g. Exhibition), the game starts normally.
So, what am I missing? What else should I change to make the game run normally with the text changed?