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 Post subject: reassemble game
PostPosted: Sun Jun 26, 2005 2:11 pm 
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Joined: Sun Jun 26, 2005 2:05 pm
Posts: 11
Hello!
I'm working on dissasembling a game, and I want to reassemble it.
I have dissasembled bank 7, last one (it is an 8 banks ROM).
But I know no way of reassemble the whole game.
Anyone knows??
Thank you.


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PostPosted: Sun Jun 26, 2005 9:29 pm 
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Posts: 3470
Location: Indianapolis
What are you changing in it? In some cases it can be easier to hex edit any changes into the ROM, honestly. With a rough dissassembly as a road-map. That's what I've done for ripping NSFs when some code has to be changed or added.

Before you make any changes, you need to be able to re-assemble the ROM though and be sure it comes out 100% exact. I've used the IDA disassembler, which is really cool, but it still wasn't able to get Spy Hunter to reassemble (it was messing up some addresses, removing bytes somewhere).

See this thread: http://nesdev.com/bbs/viewtopic.php?t=357

And try Hyde's disassembler on there (at the end of the thread), maybe you'll have some luck with it. I was able to reassemble the source that it output, and it worked nicely.

Once you get your modified bank assembled, you can edit it into the rest of the ROM. I'd just split the original up and do something like
"copy /b first7PRGbanks+modified.rom+chr.rom new.nes"


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PostPosted: Tue Jun 28, 2005 1:46 am 
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Yes, I will try that dissasembler and see how it works.
I was using NES Disassembler v1.0 beta4, that works fairly well, but still misses things.


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