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1 user currently in Rom Hacking:  hukka |
| Acmlm's Board - I2 Archive - Rom Hacking - What is Checksum? |
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js13 Red Paragoomba Banned - Off-topic posts, regression since 6/13 Level: 13 Posts: 7/51 EXP: 8598 For next: 1669 Since: 04-24-04 From: webster,tx Since last post: 487 days Last activity: 339 days |
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| can someone explain this to me, i found it while exploring Hack-o-Matic. (Great program btw) | |||
Darth Coby Vire Dacht je nou echt dat het over was? Dacht je nou echt dat ik gebroken was? Nee toch? Nou kijk eens goed op uit je ogen gast. zonder clic heb je geen kloten tjap... bitch Level: 55  Posts: 527/1371 EXP: 1240774 For next: 73415 Since: 03-15-04 From: Belgium Since last post: 2 days Last activity: 9 hours |
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| A checksum is something that checks if some bytes are a certain sum. Just like it says. It's to make sure the program stays unaltered. There are ways around the checksum though, say the checksum is set to check three bytes, and they have to add up to $15 and the bytes are 05 05 05. To edit those and now trigger the checksum you could do something like 03 06 06. That would still give $15 and the checksum wouldn't complain. OR you could just point the checksum to another location in the ROM and always give it those bytes. But that's a bit more advanced. |
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Kefka Indefinitely Unbanned Level: 81 Posts: 1195/3392 EXP: 4826208 For next: 166641 Since: 03-15-04 From: Pomona, CALIFORNIA BABY! Since last post: 4 hours Last activity: 4 hours |
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Checksum= security guard for certain parts of the program it is meant to protect, in short. You can hack them though so that you can alter the protected part of the program  |
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frantik Paragoomba Level: 15 Posts: 55/66 EXP: 13104 For next: 3280 Since: 03-15-04 Since last post: 400 days Last activity: 339 days |
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it's the sum of a certain list of values that is used to check the integrity of the data  |
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DahrkDaiz Red Super Koopa  Acmlm's Mosts 2005 Best ROM Hacker Level: 45  Posts: 119/885 EXP: 643520 For next: 16644 Since: 03-15-04 From: K-Town Since last post: 4 hours Last activity: 4 hours |
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| Or you can go in and just NOP the checksum routine out of the game ;D | |||
MathOnNapkins Math n' Hacks Level: 67  Posts: 165/2189 EXP: 2495887 For next: 96985 Since: 03-18-04 From: Base Tourian Since last post: 1 hour Last activity: 32 min. |
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| ^ That's my preferred method. Losing corrupted save games sucks (for hacking at least) | |||
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HyperLamer <||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people Sesshomaru Tamaranian Level: 118 Posts: 530/8210 EXP: 18171887 For next: 211027 Since: 03-15-04 From: Canada, w00t! LOL FAD Since last post: 2 hours Last activity: 2 hours |
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| Yes, except that the checksum he's referring to is the global sum of a GB ROM. Some emulators don't like it when they're wrong. |
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| Acmlm's Board - I2 Archive - Rom Hacking - What is Checksum? |
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