flyjam Posted June 13, 2008 Report Share Posted June 13, 2008 hi all, i'm a beginner at this so there's probably a very simple and straightforward solution to this that is beyond me, but i just did some simple editing of players' names in a hex editor, saved the file and tried to open it in the gens emulator. all i got was a black screen. this isn't a case of me fooling with things that shouldnt be fooled with, because the same happens when all i change is one letter in someone's name or something of the like. i'd imagine i need to do something to fix the checksum or header of the new rom (i have no idea what these terms mean but i see them thrown around a lot), but i really dont know... can someone help me out and explain how i can prevent this? before you say "just use one of the rom editing programs," i'm attempting to edit other games which don't have editors released so this is an important problem for me to figure out. thanks a lot Quote Link to comment Share on other sites More sharing options...
smozoma Posted June 13, 2008 Report Share Posted June 13, 2008 hi all,i'm a beginner at this so there's probably a very simple and straightforward solution to this that is beyond me, but i just did some simple editing of players' names in a hex editor, saved the file and tried to open it in the gens emulator. all i got was a black screen. this isn't a case of me fooling with things that shouldnt be fooled with, because the same happens when all i change is one letter in someone's name or something of the like. i'd imagine i need to do something to fix the checksum or header of the new rom (i have no idea what these terms mean but i see them thrown around a lot), but i really dont know... can someone help me out and explain how i can prevent this? before you say "just use one of the rom editing programs," i'm attempting to edit other games which don't have editors released so this is an important problem for me to figure out. thanks a lot http://en.wikipedia.org/wiki/Checksum Near the end if the file, there is a checksum value that needs to be correct. Quote Link to comment Share on other sites More sharing options...
flyjam Posted June 13, 2008 Author Report Share Posted June 13, 2008 sorry if this is another stupid question, but is there an easy way to make this become correct? Quote Link to comment Share on other sites More sharing options...
smozoma Posted June 13, 2008 Report Share Posted June 13, 2008 sorry if this is another stupid question, but is there an easy way to make this become correct? write a program that runs through the file and add up the values of the bytes, then re-writes the checksum. don't include the old checksum when calculating the new one Quote Link to comment Share on other sites More sharing options...
wboy Posted June 13, 2008 Report Share Posted June 13, 2008 Hint... Search the forums... Hacking any other Genesis EA series games will be similar to the structure shown in the NHL series... other games from other developers/game consoles may have completely different data structures you will need to contend with... Note, the EA games use their own checksum routine, and not the default one used by most Genesis ROMs... which Gens etc. ignore anyway (if it wrong) and still loadw the game. Quote Link to comment Share on other sites More sharing options...
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