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PostPosted: Thu Sep 08, 2016 7:11 am 
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Joined: Mon Nov 10, 2008 3:09 pm
Posts: 431
I noticed byuu's tweet about his dump of the PAL version of Maximum Carnage not matching the one that's in all the hash lists, and had a look. Other than the header checksums, there are 3 changed bytes, very close to each other. Opening the ROM in a tile viewer, it's immediately obvious that the changed bytes are part of an uncompressed sprite. That sprite turns out to be part of Spider-Man's walk animation, which you can see immediately after starting a game.

The dump that's in all the hash lists:
Image

byuu's redump:
Image

See the gray pixels on Spider-Man's leg and hand in the old dump? The sprite in byuu's redump exactly matches the US version (though they're offset by a few dozen bytes--the sprite in the PAL ROM starts at $50FF9, the one in the US ROM at $51028)

Either someone had a copy of the game on old 1.44MB floppies or something that bitrotted, ran a checksum fixer on it, and this hacked-checksum version got accepted as "good" by both Cowering and No-Intro, or Nintendo of Europe actually manufactured a version of the game with a bad sprite, and later released a fixed version without bumping the version number.

If it's not too much trouble, I wonder if byuu could open up his cartridge and describe the label on the mask ROM.


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PostPosted: Thu Sep 08, 2016 12:58 pm 
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Joined: Mon Mar 27, 2006 5:23 pm
Posts: 1339
Wow, you are totally awesome, AWJ! Thank you :D

I haven't done the 600DPI scan yet, so please excuse the camera phone pic.

As you requested, click for full resolution:

Image


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