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1 user currently in Rom Hacking:  hukka |
| Acmlm's Board - I2 Archive - Rom Hacking - A question about text hacking. |
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NMorgan Micro-Goomba Level: 7  Posts: 9/16 EXP: 1406 For next: 42 Since: 07-07-04 From: New Jersey, USA Since last post: 78 days Last activity: 75 days |
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| This question is hard to explain, so bear with me. I am doing a text and graphic hack for the NES game "Earthbound Zero", but I am having a problem hacking the text. You see, all of the text in the entire game is stored in the same place in the ROM. Each text set is divided up in between two [DIA] tags. View the picture below to see what I'm talking about.  Do you see the part on the right where it says "You remembered the tune"? Well, I want it to say "Mario remembered the tune", but if I do that, I will have to expand the amount of characters (by two) in between the two [DIA] tags. Is there any way to do this without taking away the amount of characters from other strings of text? NOTE: This is just one example out of hundreds of places where I need to expand the amount of characters. Also, you should know that there is plenty of free space immediately after the text, so you don't have to worry about running out of space. Any help that you are willing to give will be GREATLY appreciated. Thank you in advance. (edited by NMorgan on 07-11-04 03:15 AM) (edited by NMorgan on 07-11-04 03:16 AM) |
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Acmlm Torosu heh Level: 51  Posts: 822/1173 EXP: 981994 For next: 31944 Since: 03-15-04 From: Somewhere that isn't outside of Sherbrooke, Québec, Canada Since last post: 39 days Last activity: 3 hours |
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Originally posted by NMorganGood, that means you only need to find and change the text pointers  In this example, the text you want to change starts at $6BD28 ... seeing how the whole ROM is $80090, there must be the $10 header + a $80 trainer in first, so you should get $6BC98 excluding that, a pointer to it will probably be $BC98 (98BC) or $FC98 (98FC) ... look for it, change it so it points somewhere in the free space, and put the new text there, using as much space as you need  |
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Rain Man Buzzy Beetle Level: 31 Posts: 32/378 EXP: 175079 For next: 10284 Since: 04-14-04 Since last post: 5 days Last activity: 16 hours |
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NMorgan Micro-Goomba Level: 7 Posts: 11/16 EXP: 1406 For next: 42 Since: 07-07-04 From: New Jersey, USA Since last post: 78 days Last activity: 75 days |
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| Acmlm, that post was pretty wild. I didn't really understand that at all. Actually, that's not completely true. I understand that you are telling me to put the text in the free space I have. I have put the words "Mario remembered the tune" in free space, but how do I find change the pointers? Any help is good, and don't confuse me too much like Acmlm just did. (I'm sure it's something very simple, I just don't know how). Thanks |
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Lenophis Super Koopa Level: 44  Posts: 68/830 EXP: 584360 For next: 26925 Since: 03-15-04 From: Duluth, MN Since last post: 4 hours Last activity: 3 hours |
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| He did tell you, but chances are it whooshed right over your head. First, you must find the pointers, they are usually behind the text or whatever they point to. Example... say $50000 (or 0x50000, however you look at it) has a pointer... now, pointers are generally 2 bytes, so %50000 and $50001 is the location of a pointer. Let's say the data there reads as follows: $50000: 92 $50001: DB your pointer is DB92, because this is what is called "little endian" (I think). You must swap the two bytes. Now, you have the pointer, but where does it point? It's easy to calculate... since pointers generally if not always point forwards (some verify this?) you must first add $50000, and subtract $10. In most nes roms, the first $10 is the header. The header is never calculated in pointers. Overall, $4FFF0 is added. Now comes the easy part... add DB92 and 4FFF0. 5DB82 should be the number you come up with. That's the data this pointer points to. Now, this is a dummy example, hopefully you picked up on that already. What Acmlm said, is to basically change the pointer to point to your new text. So let's say your old text is at $5DC92, and your new text is at $5DCF1. The current pointer should be A2 DC, you'd simply need to change it to DD 01. There, pointer changed, and the new text will display. Hope this helps. PS: to the experienced, how'd I do in my first explanation? |
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Xkeeper The required libraries have not been defined. Level: NAN  Posts: -3502/-863 EXP: NAN For next: 0 Since: 03-15-04 Since last post: 2 hours Last activity: -753366 sec. |
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| There's also another thing that might be; if theree's free space RIGHT after the text area, it might just start going through the script until it hits a certain amount of [Dia]s. Well, it's always worth a shot. That's how Crystal Mines did stuff (just put FF FF at the end of each level, so you could swtich them around)  |
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NMorgan Micro-Goomba Level: 7 Posts: 13/16 EXP: 1406 For next: 42 Since: 07-07-04 From: New Jersey, USA Since last post: 78 days Last activity: 75 days |
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| Okay, I am still utterly confused. Is there some kind of tutorial out there about pointers? If so, could you be a doll and direct me to it? Thanks, Nick |
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