Hi guys, can I get a little help please? (SMB1 question)

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Main - ROM Hacking - Hi guys, can I get a little help please? (SMB1 question)

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EggplantPimp

Posted on 12-06-07 05:12 AM

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I found this video ealier today and thought, I want to make a hack out of this game genie code...

Now, I entered the code into FCEUXD SP 1.07 and saw the following addresses and changed them to ED at the possible affected rom file addresses. And when I did that, it made the enemies throw the hammers, but it also screws up the ROM.

Any advice would really be appreciated, thanks for reading my thread guys.

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frantik

Posted on 12-06-07 10:16 AM

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ED.. thats SBC (subtract accumulator from memory) did you want NOP (EA) ?

EggplantPimp

Posted on 12-06-07 03:24 PM

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I guess that's what I'm looking for, I'm sorry for asking but what's NOP? But yeah the offsets to change to make the effects I need. I'm sorry if I don't sound like I'm making sense, I just woke up a few minutes ago. ^^

I did try that Game Genie Code program at Zophar's last night, no dice.

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Treeki

Posted on 12-06-07 03:36 PM

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Posted by Stufid
I guess that's what I'm looking for, I'm sorry for asking but what's NOP? But yeah the offsets to change to make the effects I need. I'm sorry if I don't sound like I'm making sense, I just woke up a few minutes ago. ^^

I did try that Game Genie Code program at Zophar's last night, no dice.

NOP is a "do nothing" instruction. It is solely one byte and does nothing but waste a CPU cycle. Rather useless! But useful if you want to disable an instruction without completely removing it and breaking all the branch offsets in the code.
If you can post the offsets you are editing, I could check the code located at those offsets to see what exactly you need to edit.

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blackhole89

Posted on 12-06-07 03:39 PM

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"No OPeration".

It's also used as padding for redneckish, not interrupt-based timing implementations.

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CKY-9K

Posted on 12-06-07 06:53 PM

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fceuxd

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EggplantPimp

Posted on 12-06-07 08:24 PM

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Posted by Treeki
Posted by Stufid
I guess that's what I'm looking for, I'm sorry for asking but what's NOP? But yeah the offsets to change to make the effects I need. I'm sorry if I don't sound like I'm making sense, I just woke up a few minutes ago. ^^

I did try that Game Genie Code program at Zophar's last night, no dice.

NOP is a "do nothing" instruction. It is solely one byte and does nothing but waste a CPU cycle. Rather useless! But useful if you want to disable an instruction without completely removing it and breaking all the branch offsets in the code.
If you can post the offsets you are editing, I could check the code located at those offsets to see what exactly you need to edit.

Here's what comes out of the Game Genie Encoder/Decoder Tool using FECUXD SP 1.07...

Address/Compare/Value Game Genie Code

Address: C900 STAGEO
Compare: -Blank-
Value: ED

Possible Affected ROM File Addresses
000910
002910
004910
006910

Thanks Treeki for helping me. ^^

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CKY-9K

Posted on 12-07-07 04:51 AM

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Clicking on the addresses brings you to the address in the live ROM hex editor.

From there, you can go through the list to apply the value and see which one is the exact address that you should change.

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frantik

Posted on 12-07-07 09:55 AM

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ok sorry I got confused cause i didnt realize the game genie code was STAGEO so i didnt know it called for ED.. forget the whole NOP thing lol

I changed $c900 (0x4910 in the rom file) from 05 to ED and it worked just like the movie....

EggplantPimp

Posted on 12-08-07 09:24 PM

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Thanks Frantik, you're the bestest.

' I'm gonna try it out, *HUGS!*

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frantik

Posted on 12-08-07 11:12 PM

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no problem

In SMB1 since it doesn't use a mapper you can always figure out the actual ROM file address from the memory address by simply subtracting $7FF0 from the memory address. ($7FF0 = $8000 of ROM memory - $10 byte header)

Main - ROM Hacking - Hi guys, can I get a little help please? (SMB1 question)

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