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PostPosted: 08 Oct 2014 03:52 
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hello, about this rom:

bad crc from scene: 35785B15
good crc: 052708D7

redumped crc: 6cb86b0b

I have to ask: do we remember where 052708D7 comes from? we manually modified the release?


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PostPosted: 08 Oct 2014 07:46 
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I redumped it back then. If I remember correctly the only difference between my dump and the scene release were a few bytes at the end of the rom. But how come there seem to exist three or even more checksums for one game?


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PostPosted: 08 Oct 2014 08:27 
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It might be possible when they use a ROM chip bigger than required and there exist versions with different padding. But here I don't know. I guess you redumped it several times? Do you still have it to confirm once more?

Who provided 052708D7? Retrogamer? How did he dump and did he also verify several times? Sorry to ask but we had a case once before where the "redump" was actually bad and got corrected by a re-redump after cleaning etc. Then we know two cases where there was a problem with the chip itself and one or two where reading from the pins did not match a dump with an EPROM programmer but those cases are rare exceptions. Anyone compared the three dumps we got?


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PostPosted: 08 Oct 2014 20:01 
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yes Retrogamer


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PostPosted: 08 Oct 2014 21:22 
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I provided 052708D7 and yes, I dumped it several times to verify it was correct. I still have the cartridge though so redumping it once again after cleaning the PCB or whatever shouldn't be a problem. I'll do that ASAP and let you guys know the results.


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PostPosted: 08 Oct 2014 22:04 
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Ok, I just dumped it again with my good old EZwriter and got the same crc as always (052708D7). The PCB looks good/legit to me so this can't be the reason why I get different checksums than everybody else.


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PostPosted: 09 Oct 2014 08:55 
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I believe there is something wrong either with Retrogamer's dump or his cart since there are two odd bytes in the 00-filled area at the end and that's the only difference.


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PostPosted: 09 Oct 2014 19:56 
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Dumper
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That's interesting, because the only difference between the scene release and my redump is 80 FF 80 FF* at hex offset 01FFFF00. In my redump there are only zeros. What are the bytes and their position in Retrogamer's dump?

*This byte order isn't that uncommon by the way. If I remember correctly there were quite a few games (especially from EA) that had this or a very similar pattern at the end of the rom. So I'm not quite convinced that it's a faulty dump. Maybe it has something to do with the dumper used?


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PostPosted: 09 Oct 2014 20:22 
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Ok, this is odd:

The releases all differ at 0x01FFFF00

scene release: 80FF80FF
Retrogamer: FEFF0000
Dopefish: 00000000


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PostPosted: 10 Oct 2014 01:27 
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Hi,

I opened and cleaned (anyway the connectors and the cart itself were like new) and dumped it several times and the resulting hashes were always the same...

I dumped around 100 GBA carts and this game and IK+ were the only ones that didn't matched the database...

I used my DS phat and GBA Backup Tool 0.21 for dumping the carts.

Since the different bytes of the 3 dumps were always in the same position, maybe they are all good dumps, or Alt versions...


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PostPosted: 10 Oct 2014 07:52 
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Maybe it has something to do with the country of origin, i.e. all differ only in a few bytes based on where you bought the game? I bought mine in a German second hand shop and the cart has the serial AGB-BH8P-EUR written on it. On the PCB there's AGB-E24-01 written on it.


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PostPosted: 10 Oct 2014 09:32 
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It could also be a bug in the dumper software. Best way to check would be an exchange of the carts in question and see what happens :sdrop:

Sorry - but I don't believe in "alternates". They don't make sense at all. Maybe I'll try to find this game and check it out as well.


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PostPosted: 10 Oct 2014 16:02 
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Yah, maybe it's a issue with the dumping program, but anyway it's weird...

Sadly i don´t own any copier (although i have hundreds and hundreds of carts :/ ) so i can´t dump this cart in another hardware... Dopefish, do you have a DS and a flash cart? To see if the dump made with a DS matched the one dumped by the GBA flash cart...

Well, mine cart was bought in Portugal and these are the photos that i took:


You do not have the required permissions to view the files attached to this post.


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PostPosted: 10 Oct 2014 19:05 
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Unfortunately I don't have a flash cart anymore to dump it with my DS. I made lots of redumps with my EZwriter in the past and all matched the dats except a few. But I do agree that it must be an issue with the dumping method rather than the game itself, because I opened up the cart as well and mine looks exactly like yours.


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PostPosted: 11 Oct 2014 09:40 
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I have a Retrode, an EZ-Flash II Powerstar and theoretically also a GB Transferer II if I can get it running again in case anyone wants me to verify anything. I remember I also had such a "weird byte" issue recently - I think with Garfield - that was dependent on the voltage or software revision. Can't really remember.


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