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1 user currently in Rom Hacking:  hukka |
| Acmlm's Board - I2 Archive - Rom Hacking - Rom ASM question |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57  Posts: 196/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| Hey! I was writing new code over existing code in my ROM, and I need to know one thing. I'm using smaller code than the original, and I need to know how to add filler to take up space. right now i filled the empty spaces with 38 (SEC). is this the right code? It worked in ZSNES, but I'm wondering if that will work in a ral SNES. if not, could anyone tell me what code to use? I don't want to delete code because JSR and JSL routines would be broken. |
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Apophis Red Super Koopa Level: 45 Posts: 385/882 EXP: 640255 For next: 19909 Since: 03-15-04 Since last post: 15 hours Last activity: 15 hours |
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| Try using NOP (No Operation). | |||
Jathys Red Goomba Level: 11 Posts: 12/48 EXP: 5916 For next: 69 Since: 12-21-04 Since last post: 8 days Last activity: 8 days |
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| Set Carry shoul work just fine, as it's not effecting anything but the carry bit... Just in case Carry is checked by another operation when you leave this section of code, I'd use EA. EA = NOP = No Operation = Nothing at all gets done to anything. |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 199/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| Okay, thanks! I wondered if I was doing something wrong... nothing ever works the first time for me. |
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Parasyte Bullet Bill Level: 35  Posts: 364/514 EXP: 267348 For next: 12588 Since: 05-25-04 Since last post: 104 days Last activity: 32 days |
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| If you are referring to "filler" outside of the routines you write, just any byte will work fine. I usually use 0xFF, myself. Just so I can visually see where my free space is, if I ever need it. If you are referring to "filler" in code that actually gets executed... (though I can't figure out why you would do this, in such a situation) using NOP is the only real option. | |||
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 200/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| The reason for that is it was preexisting code and this is my first try working with Machine code. I'd say i'm doing pretty good for it. | |||
MathOnNapkins Math n' Hacks Level: 67  Posts: 1589/2189 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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Originally posted by Parasyte I've seen this in professional SNES roms. And usually it's when you're waiting for a result from hardware divide or multiply. It takes like 8 - 16 cycles or something. |
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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: 3754/8210 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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Yeah, but that's not filling empty space, that's delaying.  Having space filler actually be executed is rare, but it's generally left as 00 or FF and just ignored. (It mainly depends on your setup... Some flash carts write FF faster than 00 since the empty ROM contains all FF by default; one instruction might be better to have than the other in the event that the game crashes and tries to execute it somehow. On Gameboy/Z80, 00 is NOP while FF is essentially JP $38 (actually RST $38, but that's all it does ), so if you used FF, you could make $38 an error handler and not risk screwing things up.) |
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d4s Panser Level: 29  Posts: 133/325 EXP: 142151 For next: 5734 Since: 03-23-04 Since last post: 13 days Last activity: 1 day |
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| another idea if your number of unused bytes is greater than 2, is to branch to skip the unwanted bytes. it looks cleaner in your sourcecode and only uses 2 bytes. personally, i always prefer just placing hooks in the program that jump to my subroutines instead of writing my stuff over the games code. its more flexible and you dont have to worry about thight space and such. |
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BMF98567 BLACK HAS BUILT A SILLY DICE-MAZE! GO! Current list of BURNING FURY >8( recipients: - Yiffy Kitten (x2) - Xkeeper Level: 53  Posts: 693/1261 EXP: 1094149 For next: 62970 Since: 03-15-04 From: Blobaria Special Move: Rising Meatloaf Backhand Combo Since last post: 21 hours Last activity: 1 hour |
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Originally posted by MathOnNapkinsYeah, and the rest of the time, it indicates a spot where debugging code of some kind used to reside. For example, SMB3 waits for input from controller 2 on the title screen (A+B), but all it activates is a string of 6 NOPs.  |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 207/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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Yea. I just wanted to re-code the coin counter in SMW, and my new code was a number of bytes shorter, and I don't know JMP in machine code |
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BMF98567 BLACK HAS BUILT A SILLY DICE-MAZE! GO! Current list of BURNING FURY >8( recipients: - Yiffy Kitten (x2) - Xkeeper Level: 53 Posts: 700/1261 EXP: 1094149 For next: 62970 Since: 03-15-04 From: Blobaria Special Move: Rising Meatloaf Backhand Combo Since last post: 21 hours Last activity: 1 hour |
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Ever think of downloading an opcode list? It's very useful. I'm sure Zophar's Domain has a couple.  Anyway, JMP is 4C, JML (JMP Long) is 5C. The only difference is JML can jump anywhere in the ROM, thanks to the extra bank byte (ex: $82309F would be 5C 9F 30 82). If you're jumping a rather small distance, though, BRA would be much more efficient (as d4s mentioned). Just use 80 ##, where ## is the number of bytes you want to jump ahead. Start at 00 and count from the byte immediately after ## (00, 01, 02...). You can also branch in reverse by counting backwards (00, FF, FE, FD...). |
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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: 3766/8210 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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| I bet that A+B thing would have activated the debug menu that lets you choose a world and stuff. I wonder if that's the deal with some of the useless code in Pok |
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