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WTF is up with those error messages

Discussion in 'Engineering & Reverse Engineering' started by Sonic 65, Jan 12, 2005.

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  1. Jan 12, 2005 #1
    Sonic 65

    Sonic 65

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    I'm trying to make 2 Sonic objects that share different mappings/art in S1. I copy-pasted all the code, mappings, and art. Then I go to GHZ1 and...

    ILLEGAL INSTRUCTION $00080079

    I looked at $80079, but found nothing that needed to be fixed. What is wrong here?

    THE ROM
     
  2. Jan 12, 2005 #2
    Quickman

    Quickman

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    This download speed still makes evolution look fast.

    Anyway...

    Something is jumping to $80079 which isn't an instruction. Find the reference and fix it.
     
  3. Jan 12, 2005 #3
    Hivebrain

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    Could be that it's trying to jump to an odd address, which is a problem in most emulators.
     
  4. Jan 12, 2005 #4
    StephenUK

    StephenUK

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    I see your doing the same thing I'm doing, only your doing it in Sonic 1, whereas I'm doing it in Sonic 2. Hope you find what your looking for. If the code works in a similar way between both games, I'll let you know if I find out what the problem is. I'm working on it at the moment.
     
  5. Jan 12, 2005 #5
    Rika Chou

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    IIRC you cannot just relocate the data, because some pointers need to be changed within the code itself.
     
  6. Jan 13, 2005 #6
    Ayla

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    Sonic 1 is a touchy game. You misaligned a pointer somewhere is what it sounds like.
     
  7. Jan 13, 2005 #7
    LOst

    LOst

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    Well, I think he has made a disassembly of Sonic 1 and tries to put data and code in between other code instead of at the end. And that's the first mistake people do. You can't just believe you have a disassembly ready by pressing a button. you need to convert every pointer to a label first, and it's also good to make the data into bytes and words correctly.
     
  8. Jan 13, 2005 #8
    Sonic 65

    Sonic 65

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    I'm using Hivebrain's disassembly, I don't know fuck about the Sonic source code without the labels.

    I also put it at the end and put a 4E 75 between things I put at the end.
     
  9. Jan 13, 2005 #9
    LOst

    LOst

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    When did Hivebrain release his disassembly?

    I haven't seen anything at Sonicology. It would be grand news when he did I guess.
     
  10. Jan 13, 2005 #10
    Rika Chou

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    =/
     
  11. Jan 14, 2005 #11
    LOst

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    I remember he released a old one at A51, but when I went back to get it, it was removed from the server. I guess drx saved it and put it up?
     
  12. Jan 14, 2005 #12
    Ayla

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    I should learn rom programming... haven't really bothered since I got out of the scene for so long. I think I will.
     
  13. Jan 14, 2005 #13
    Hivebrain

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    It's been on Hacking Cult for ages.

    My next S1 disassembly will be finished around March or early spring. It'll have 100% correct pointers (which the old version doesn't have), and lots of comments and labels.
     
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