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| Acmlm's Board - I3 Archive - SMW Hacking - Yoshi related ASM sub-routines |
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1169 Red Goomba                  Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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| Edit: I slacked off a bit the last few days; but am back at mapping Yoshi. I am removing the (3 paragraph) intro from the post to make it easier to read. Below is my research in to Yoshi related sub-routines. I have also included (at the bottom) Yoshi related info found by others.
==== 01ed9e to 01edcd Is fired (once) as Mario attempts to dismount Yoshi. 01edce to 01ede1 Is fired (once) as Mario attempts to mount or dismount yoshi. 01ea75 to 01eb4d and 01ebca to 01ebe2 Are called every frame (or more?) when Yoshi is active (it doesn't matter if Yoshi is on the screen or not, so I suspect it has more to do with Yoshi's behaviour then rendering) 01eb4e to 01ebb3 Are called every frame (or more?) when Mario is on Yoshi - only when he is on Yoshi . . . it starts being called as soon as Mario touches the top of Yoshis interactive "box". 01ede3 Is read as Mario mounts Yoshi. 01ede2 Is read as Mario dismounts Yoshi. 01ebc0 Is read when Mario jumps off Yoshi and Yoshi is facing left . . . 01ebc1 Is read when Mario jumps off Yoshi and Yoshi is facing right. . . ==== Mabey Related: 01ea70 to 01ea75 Are called every frame regardless of wether Yoshi is up or not; but given the closeness to the other Yoshi code (and the fact 01ea6F is not called), my unconfirmed guess would be this is the code that checks wether Yoshi is up or not. ==== Other Peoples Research (mainly flags) (from the SMW Memory Map e.g. not my research) 7E13C7 Yoshi colour (4=yellow, 6=blue, 8=red, A=green - refreshes on level change) 7E1410 Yoshi Has Wings flag # 1. The value 02 enables it. This doesn't handle the flying ability. 7E160E Table related to Yoshi eating stuff (I am going to look in to this one tonight see if I can't figure more out) 7E1616 Yoshi's mouth flag 7E18AC Yoshi Swallow Frame Counter/Status 7E18E2 Loose Yoshi Flag (if set, any Yoshis spawned become 1ups instead) 7E1B95 Player::Yoshi has Wings Flag (edited by lynch82 on 04-01-06 08:03 AM) |
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ghettoyouth Panser  Since: 11-19-05 From: Germany Last post: 6396 days Last view: 6396 days |
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| xF4FF the subroutine for yoshi's tongue
sound effect adresses: xF957 SFX that is played when Yoshi's egg breaks. xA4C6 SFX that is played after the egg is broken. xEF60 SFX that is played when Mario jumps on Yoshi xF50F SFX that is played when Yoshi's tongue comes out. |
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1169 Red Goomba Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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Originally posted by ghettoyouth Excellent (: thanks. |
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ghettoyouth Panser Since: 11-19-05 From: Germany Last post: 6396 days Last view: 6396 days |
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no problem, i'm looking an adress to disable the ducking of yoshi. so if anyone finds it please post it here  |
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1169 Red Goomba Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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Originally posted by ghettoyouth I wil keep an eye out for that address for you. Although if we can't find it we know the location of a block of code that only executes when Mario is on Yoshi; so you could replace some of it with a jump to some custom code that disables the down key (if that address is known, I think I read it somewhere) Ofcourse you wouldn't want to do that until we know the address for unmounting (currently I have only found 2 single word addresses, which seperately get called depending on direction, not enough for a jump) The other downside of that way (appart from being alittle messy) is that yoshi can't go down pipes if the down key is disabled. (edited by lynch82 on 03-30-06 09:26 AM) |
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ghettoyouth Panser Since: 11-19-05 From: Germany Last post: 6396 days Last view: 6396 days |
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Originally posted by lynch82 doesn't matter, i want to replace yoshi with kuribo's shoe  |
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Mattrizzle Red Goomba   Since: 11-17-05 From: Louisville, KY, USA Last post: 6580 days Last view: 6580 days |
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Originally posted by ghettoyouthOriginally posted by lynch82 Kuribo's Shoe could go down pipes, though. |
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Stephan Reiken Blipper   Since: 11-17-05 Last post: 6289 days Last view: 6283 days |
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Originally posted by lynch82 Dude, you are doing things way beyond the scope of most beginners. I don't really consider myself a vet, really I'm not that great at all, but you've come into this way ahead. Don't sell yourself short  .
I don't know how much help it'd be, but there is some pretty in-depth stuff at http://www.zophar.net/tech/snes.html |
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1169 Red Goomba Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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Originally posted by Stephan Reiken Thanks for the comment, and the link. I wasn't really trying to sell myself short; I was just being cautious. I don't know what the general level of ASM ROM-hacking knowledge is around here, so I want to make it clear I was new; so as to not frustrate people if my methods are to slow or brutish. |
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Xeruss Cukeman  Since: 11-18-05 From: Oregon Last post: 6282 days Last view: 6282 days |
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Originally posted by lynch82 |
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Smallhacker Super Koopa I AM A Group Of Officially Frustrated Younglings, G.O.O.F.Y. MEMBER |
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Originally posted by XerussOriginally posted by lynch82 "refreshes on level change" means that Yoshi won't be updated until you enter a new level (or return to the overworld. Can't remember which). |
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MathOnNapkins  1100  In SPC700 HELL Since: 11-18-05 Last post: 6282 days Last view: 6282 days |
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| In all honesty, I don't think it would be that hard to do that in the middle of a level. Where's your sense of adventure? |
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1169 Red Goomba Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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| You could make it do it in the middle of the level; but heck you COULD do anything if you hacked long enough.
What I believe smallhacker was saying, and what I can confirm from experience is Yoshi's colour is stored elsewhere (address unknown), changing the yoshi flag (mentioned above) mid-level does nothing as it resets to the value it was at the start of the level every frame. |
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1169 Red Goomba Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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| Ok, well I have more than enough information to do what I want to do to Yoshi; so I probably won't be updating this thread for a while (unless i get bored and want to map him more for fun).
I hope other people find this information useful; I know I have found the mount and dismout routines very handy. |
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MathOnNapkins 1100 In SPC700 HELL Since: 11-18-05 Last post: 6282 days Last view: 6282 days |
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| I was going to post this a few days ago, but I was bored so I wanted to see if there actually was a quick way to change yoshi's color and behavior - mid level.
I used Geiger's Snes9x Debugger and set a write breakpoint on $7E13C7. Turns out this value was getting updated every frame from a location in the array at $7E15F6, X. I don't know that location very well, but it appears to be in the middle of a group of other sprite information. This says to me that Yoshi is just another sprite object on screen that Mario interacts with... am I wrong? Like, is he in the same class as the enemies or is he seperate from them. Anyways, if you can locate the entry in $7E15F6, X that corresponds to Yoshi, you can change his color to one of the values listed (4, 6, 8, A) and his color and behavior will change within the next frame. I could not figure out how the game knows which entry is Yoshi's since Geiger's isn't as advanced as I wanted it to be. That would have required breakpoints on things like writes to the X register, and being able to filter out certain addresses when using breakpoints. My point is that Yoshi is allocated as soon as he gets on screen, just like any other sprite, and thus his entry could appear at $7E15FE, $7E15F8, or any other byte in that array. I suspect the array is only 10 byte long but again I'm not familiar enough with this game to know for sure. |
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C:/xkas bio.asm Compiled ASM code  Since: 11-17-05 Last post: 6283 days Last view: 6282 days |
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Originally posted by MathOnNapkins yes he is in the same class, he use sprite number 35, to locate which entry he use, you could check the sprite type table(located at 7E009E) (edited by Bio on 04-02-06 09:42 PM) (edited by Bio on 04-02-06 09:47 PM) |
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1169 Red Goomba Since: 03-27-06 From: Gold Coast, Australia Last post: 6597 days Last view: 6597 days |
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Originally posted by MathOnNapkins Handy to know. I knew 7E13C7 was being set every frame, but didn't bother to try find out where as I was focusing more on interaction than rendering; but I am glad someone did (: As for being in the same class as enemies, I think this is both true and partially-untrue. For the most part he acts the same as any other object on screen; but he has a much larger interaction scope than most objects. I suspect most enemies reuse a small set of sub-routines; where as yoshi seems to have quite a few of his own. Also Yoshi is one of the few objects which actively effects the rendering of mario (moving him up and down slightly as Yoshi moves, etc) It will actually be interesting to see (with more detailed testing) wether any of the sub-routines above fire for any other sprites. I ofcourse did many basic tests to confirm they were primarily Yoshi related; but still as many tests as I did I am sure there are a million more to do. Remember as well that there is more than one Yoshi. The little Yoshis, while seemingly still part of the same sprite, do not interact with Mario in the same way... the seem to use the same routines as 'kickable' objects. (edited by lynch82 on 04-02-06 10:06 PM) |
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