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| 0 users currently in ROM Hacking. |
| Acmlm's Board - I3 Archive - ROM Hacking - Cruelty to keys: Bizarre key behavior in SMB2... but why? |
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The Kins Hoarder                    Since: 11-18-05 From: Hurf. Last post: 6292 days Last view: 6278 days |
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Kinda strange that there are still some bugs in the Mario games that aren't mentioned on any websites. Shmorky mentioned this on the SA forums:
Originally posted by Shmorky Here's a animated gif someone made of it: 
So anyway, I was wondering if someone with experience with how SMB2 works (BMF?) knew why this happened. Does the key use Birdo code or something? Or is it just a really obscure easter egg? |
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Deleted User Banned    Since: 05-08-06 Last post: None Last view: 6278 days |
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| work tis ''tric/easter egg'' in real nes and smb 2? or only in emulator?
very strange...  |
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The Kins Hoarder  Since: 11-18-05 From: Hurf. Last post: 6292 days Last view: 6278 days |
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Originally posted by legomanI don't think Shmorky uses emulators. I haven't tried it on an actual console, but I can't see why it wouldn't work. |
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Deleted User Banned Since: 05-08-06 Last post: None Last view: 6278 days |
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| this.......work........on......real....nes!
download video: http://85.157.68.87/legoman/strange.rar this isin't not joke! |
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Disch Red Cheep-cheep Since: 12-10-05 Last post: 6557 days Last view: 6557 days |
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| I don't see how something like that could POSSIBLY be an emulator bug.
Of course it would happen on a real NES. =P Why is that so suprising? |
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Reshaper256  190 Since: 11-17-05 From: United States Last post: 6320 days Last view: 6277 days |
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| This is just off the top of my head, but from what was said about the key 'bouncing', it may have something to do with the game assuming the key is in the belly of a Birdo whenever it is at a certain height above ground and is struck by an object.
That's pretty vague though, I realize. |
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Dwedit Rope フクト オン フォニクス  Since: 11-17-05 From: Chicago! Last post: 6279 days Last view: 6278 days |
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| You can also do it in Doki Doki Panic. | |||
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Deleted User Banned Since: 05-08-06 Last post: None Last view: 6278 days |
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| I remember doing this on the NES when I was younger. Me and my friends freaked out. I never knew how we did it tho. Thanks for pointing that out. | |||
HyperHacker Star Mario Finally being paid to code in VB! If only I still enjoyed that. <_< Wii #7182 6487 4198 1828 Since: 11-18-05 From: Canada, w00t! My computer's specs, if anyone gives a damn. STOP TRUNCATING THIS >8^( Last post: 6278 days Last view: 6278 days |
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| They probably just forgot to set some flag in the key's sprite info, or never thought to (or just didn't care to) add code to prevent this. | |||
Dragonsbrethren 440  Since: 12-01-05 From: New Jersey Last post: 6465 days Last view: 6465 days |
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| I seem to remember this happening to me back in the day too. | |||
BMF54123 Since: 11-18-05 From: MOOGLES Last post: 6278 days Last view: 6277 days |
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Heheh, interesting...I just looked into this, and apparently all sprites have "hit points," even though only bosses actually use them! Normally, all regular sprites set this value to zero. When a sprite is hit, its counter is decremented by one, and when it wraps around to FF (technically, whenever the N flag is set, between 80-FF), the sprite is killed. (With a little hacking, you can give regular sprites hit points, and they'll act just like Birdo when hit.  )
However, the key is a little different...instead of dying when its hit counter goes negative, it is merely bounced upwards a little. When hit with a mushroom block, its "death" code is repeatedly triggered (about 8 times per toss), which pushes the key up and out of the way of the falling block. Due to either laziness or an oversight on Nintendo's part, the key's hit counter is never reset to zero, and continues to decrement each time the key is hit. Once the counter reaches 7F and the N flag is cleared, the game suddenly thinks the key is "alive" and has 128 hit points, and starts treating it like an enemy (Birdo sound effects and all). If it is hit 128 more times, the counter will again wrap around to FF, and the key will return to its normal "dead" state. I have a feeling Phanto's hit counter works in a similar way... |
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The Kins Hoarder Since: 11-18-05 From: Hurf. Last post: 6292 days Last view: 6278 days |
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| Thanks for that, I was interested. | |||
Ice Ranger Grizzo  Since: 11-24-05 Last post: 6287 days Last view: 6277 days |
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Originally posted by BMF54123 Man, I wish I knew what I had stumbled across back whenever I was documenting SMB2 nonstop. Do you have any offsets, because it's been a long time since I looked at it. If I remember correctly, does it use an LDA op with several STA ops afterward? I really don't remember, it was this summer whenever I last looked into that type of stuff. If not, how does it store the HP values? |
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| Acmlm's Board - I3 Archive - ROM Hacking - Cruelty to keys: Bizarre key behavior in SMB2... but why? |
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