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Rank: Koopa Troopa
Groups: Member
Joined: 8/5/2005
Posts: 167
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Hmm, it seems you're right about it locking up, though I've no idea why. I think I got as close to ripping chips out of boards and swapping them around as I'm likely to get for the time being.
I used NAPIT (From Zophars Domain) to rip a Duck Hunt ROM and a Mario ROM to pieces, then inserted the duck hunt graphics place of the mario graphics and got myself a non-working ROM. Now, it's possible I just screwed something up during my little experiment, but it was a straight transplant of two identically sized bitmap files, but I can't run the resultant ROM in JNes or Virtuanes. All I can figure is there's either some kind of checksum someplace, or some of those "tiles" I replaced are actually critical lines of machine code.
This probably goes to prove something, but I'm not sure what, aside from the fact that I'm technically inept, and the fact that the fact that a real NES works at all after being "circuit bent" is nothing short of a bona-fide miracle :D
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Rank: Koopa Troopa
Groups: Member
Joined: 4/19/2005
Posts: 80
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I think the problem with NAPIT is that it converts "an entire NES rom to a bitmap" (Zophar description). Meaning, that the actual CPU instructions are also part of the bitmap. So you're replacing machine code as well as sprites (assuming that you didn't go through and individually pick out what was true sprite and what wasn't). Also, perhaps some of the machine code got "lost in translation" so to speak, I don't know. However, I don't see why swapping the ROM contents wouldn't result in just a copy of the original ROM (ie loading up "SMB.nes" would actually play duck hunt). It might be possible to swap graphics though on an NES cart, if the graphics are stored in a separate chip from everything else.
NES images gallery!
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Rank: Bowser
Groups: Member
, Moderators
Joined: 12/13/2004
Posts: 3,577
Location: Ontario, Canada
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"Walrii" wrote:It might be possible to swap graphics though on an NES cart, if the graphics are stored in a separate chip from everything else. In theory they are, but there could be a lot more than just sprites on that chip. I stand by my guess that it just wouldn't work.
 
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Rank: Goomba
Groups: Member
Joined: 8/6/2005
Posts: 12
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what have i started here?! :lol: some intertesting points on here, think i might try swapping the chips to see what happens, since i have spare cartridges and i am always up for an experiment... one question though, which one is the CHR chip? is that the chip on the left or the right if the 72 pins are facing away from you?
cheers,
bod.
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Rank: Bowser
Groups: Member
Joined: 12/18/2004
Posts: 2,642
Location: Danville, IL
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If you open up your cart, the chips should be labeled right on them. I've noticed it usually has the initials (or close to the initials) of the name of the game, and says CHR or PRG on whichever chip respectively. I think usually the CHR is closest to the CIC chip. However, don't quote me on the latter one, as I haven't popped open all my carts yet ;) I'm still learning all of this, but I'm pretty sure the CIC chip is the 16-pin chip that's on the far right as the pins are facing away from you.
http://robertlbryant.com
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Rank: Goomba
Groups: Member
Joined: 8/6/2005
Posts: 12
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yep, the CIC is on the right hand side, and has 16 pins, the same as the one in the console.
in my UK carts, only one of the chips is labled with PRG, so i'm guessing the other is the CHR. I'll let you know how i get on!
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Rank: Lakitu
Groups: Member
Joined: 5/21/2005
Posts: 702
Location: the US of A
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If you want to create a real screwed up picture, (which you do), my idea would be to buy some Y splitters, like this:  or this  and input 2, 3, or even 4 video outputs onto the TV. The TV tries to project all the inputs at once and makes a real messed up picture with lots of colors and randomization. Best of all there only like $4 each.
 My IGN Collection
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Rank: Goomba
Groups: Member
Joined: 8/6/2005
Posts: 12
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:D yep, tried that one before! looks great, well, to me anyway.
heres some footage i took with my digital camera, the quality is not the best and you can see the roll from the tv, but i cant afford a video capture card just now.
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Rank: Bowser
Groups: Member
Joined: 6/28/2005
Posts: 2,793
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Wheres the pics? :?
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Rank: Goomba
Groups: Member
Joined: 8/6/2005
Posts: 12
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Rank: Koopa Troopa
Groups: Member
Joined: 6/25/2005
Posts: 62
Location: Melbourne - Australia
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I'm a HUGE advocate for circuit bending. Ever heard the group Voice Crack? They've dedicated the last couple of decades to making electronic equipment do what it was never meant to do. Great sounds.
More recently(and perhaps at a more popular level) you have the new Fantomas album 'Suspended Animation' that extensively utilises cercuit bending techniques.
I've seen some pretty cool curcuit bent nentendo games in my time. There's an art ensemble who dedicate a alot of their time to contorting nintendo games into mangled 8-bit cyber-junk.
It's all so post-modern isn't it? :wink:
Come to my BBBQ
The extra B is for BYOBB
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Rank: Hammer Bros.
Groups: Member
Joined: 1/28/2005
Posts: 1,962
Location: North Fort Myers, FL.
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http://www.filefarmer.com/vidiot/P7010237.JPGso, would you be able to play Contra 2 players by yourself with that controller? that'd be bad ass if you could. only thing is both players would be being controlled by the same controller and would move exactly the same. the bridge in level 1 could mess one of the players up. with the 30 lives code you could die a few times there and it wouldn't matter :P. it'd be awesome to play Contra like that! EDIT: wow that picture is big, i'll put the link up instead of the pic
http://www.geocities.com/nes_life = NES_Life http://users.ign.com/collection/campkill1387 = My Collection
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