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| Acmlm's Board - I3 Archive - ROM Hacking - I'm new at hacking |
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Cassef Newcomer               Since: 01-02-06 Last post: 6697 days Last view: 6697 days |
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| In a gbc rom how would I go about finding where the data for the map's exist. My first idea was to reorder section of bytes and see if map changes are significant. However there are 2*10^6 bytes, if I go by 10^3 sections for reordering, I will have to attempt 2*10^3 maximum times. So how would anyone go about doing this?
Thank you! |
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Guy Perfect    Since: 11-18-05 Last post: 6289 days Last view: 6287 days |
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| Use a binary search by process of elimination. Take the entire second half of the ROM and set all the bytes to 0. Load it up in an emulator and see if you affected the desired data. Continue setting certain areas of the original ROM (use the original each time) until you home in on only the region of bytes that changes what you're looking for.
Every time you do it, you eliminate the possibility of one half of the remaining ROM being the location of the data. You'll eventually home in on just the bytes that matter. Then you'll know where they are. |
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Kyoufu Kawa Intends to keep Rom Hacking in one piece until the end    Since: 11-18-05 From: Catgirl Central Station Last post: 6287 days Last view: 6287 days |
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| ... Wow.
I must remember that. Best corruption variant ever. |
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Guy Perfect Since: 11-18-05 Last post: 6289 days Last view: 6287 days |
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| Why thank you. That's what I came up with when I was hacking F-Zero X. | |||
Stifu Since: 11-18-05 From: Your mom's bed Last post: 6289 days Last view: 6287 days |
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| That's what I did a few years ago while translating a program to English... Seemed natural to me. | |||
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Cassef Newcomer Since: 01-02-06 Last post: 6697 days Last view: 6697 days |
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| what are the chances of a map being compressed for a gbc rom? |
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| Acmlm's Board - I3 Archive - ROM Hacking - I'm new at hacking |
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