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1 user currently in Rom Hacking:  hukka |
| Acmlm's Board - I2 Archive - Rom Hacking - Savestates |
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Paulus Newcomer Level: 3 Posts: 1/3 EXP: 125 For next: 3 Since: 03-26-04 From: UK Since last post: 586 days Last activity: 339 days |
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| My question is, how exactly do savestates work? Do they store everything in the RAM and the position of the game in the rom? If so, do you think it would be possible to load a 'savestate' in game using some ASM code? (assuming the savestate is stored in the rom, compressed I would hope) I was thinking mainly for the gba and if this could be used to create a hack. |
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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: 171/1371 EXP: 1240774 For next: 73415 Since: 03-15-04 From: Belgium Since last post: 2 days Last activity: 9 hours |
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Originally posted by Paulus If I'm not mistaken then a savestate is just a RAM dump yeah, probably compressed too. And if you find a way to copy all the data drom the savestate into the RAM ingame then yeah, you could use it. But then it's ONLY RAM. So it wouldn't really edit anything. |
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Paulus Newcomer Level: 3 Posts: 2/3 EXP: 125 For next: 3 Since: 03-26-04 From: UK Since last post: 586 days Last activity: 339 days |
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| the idea being that I could edit the RAM first (which could include a level for example), add the compressed dump onto the end of a rom and then load it instead of another level maybe...strange way of doing it i guess..but much easier if you cant find the level data | |||
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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: 195/1371 EXP: 1240774 For next: 73415 Since: 03-15-04 From: Belgium Since last post: 2 days Last activity: 9 hours |
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| And it should work too, but I'm probably overseeing something here. Else I'm sure it would have already been done. | |||
Dish Spiny Level: 38 Posts: 10/596 EXP: 355646 For next: 14801 Since: 03-15-04 From: Disch Since last post: 18 days Last activity: 18 days |
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| Savestates are RAM dumps... but they also have the current status of the registers and other emulator status (like PPU and APU stuff)... as well as possibly IRQ counters and other goodies. Typically... the game has control over everything that -could- happen on the system... so yeah... it is possible to load a "savestate" from the ROM... .however...
If you can find where to cut the game off and load your level instead of the regular level... then you've probably FOUND the level loading routine... as well as the level data  . I don't see how changing where the level location is and possibly the loading routine could possibly be any easier than just editing existing levels. |
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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: 198/1371 EXP: 1240774 For next: 73415 Since: 03-15-04 From: Belgium Since last post: 2 days Last activity: 9 hours |
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Originally posted by Disch Ah, there it is. I knew I forgot something. |
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Paulus Newcomer Level: 3 Posts: 3/3 EXP: 125 For next: 3 Since: 03-26-04 From: UK Since last post: 586 days Last activity: 339 days |
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Originally posted by Disch Yeah i suppose you're right. I was thinking maybe you could create a whole new 'frontend'. For example, in mario kart, you could make your own map selection screen, then load the data yourself and just use the main 'engine' of the game. Thnx for your help |
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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: 213/1371 EXP: 1240774 For next: 73415 Since: 03-15-04 From: Belgium Since last post: 2 days Last activity: 9 hours |
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Originally posted by PaulusOriginally posted by Disch That would require some serious ASM hacking, it's easier to just find the level data and edit that.  |
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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: 173/8210 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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| Savestates are full RAM/Register/hardware status dumps. It's almost possible for software to load/save a savestate of itself; however, read-only/write-only I/O registers (or those that aren't even accessible by software) can cause problems. | |||
d4s Panser Level: 29  Posts: 15/325 EXP: 142151 For next: 5734 Since: 03-23-04 Since last post: 13 days Last activity: 1 day |
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| hyperhacker: and you dont think a routine that would load up a whole savestate to ram and registers would at some point overwrite itself, no? oh,of course you could execute it from rom directly,but why would somebody want to do that? an uncompressed zsnes savestate is 270kb, or 2mbit. thats fucking huge in case you didnt notice |
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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: 222/1371 EXP: 1240774 For next: 73415 Since: 03-15-04 From: Belgium Since last post: 2 days Last activity: 9 hours |
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| Hmm, true, and if you'd have like 20 levels that would be 20*270kb = 5400kb. That would make a huge IPS file. |
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