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Tweaker knocks down another wall...

Discussion in 'Engineering & Reverse Engineering' started by Tweaker, Dec 8, 2005.

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  1. Dec 8, 2005 #1
    Tweaker

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    Yep. This time, I finally figured out how to port voices from Sonic 2 and other games just about perfectly. From what I can hear, anyway. :thumbsup:

    The method is as follows:

    1. Swap bytes 02 & 03.

    2. Swap Bytes 06 & 07.

    3. Swap Bytes 0A & 0B.

    4. Swap Bytes 16 & 17

    Remember that this is counting in hex. Starting with 00, ending with 18 (or you can pseudo-start with 01 and end at 19)

    And that's it! Enjoy porting new music, because I know I did. =P
     
  2. Dec 8, 2005 #2
    Tweaker

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    Can someone edit my above post to include my corrections? Thanks.
     
  3. Dec 8, 2005 #3
    Elusive

    Elusive

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    You can't edit your own posts? -_-

    What do you mean by 'voices'? Whole chunks of sound data? Any idea how many games this can be used with?
     
  4. Dec 8, 2005 #4
    Aurochs

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    Whatever catches my fancy
    Voices are instruments.

    Actually, they're FM settings for a channel, but they simulate instruments. See here.
     
  5. Dec 9, 2005 #5
    Heran Bago

    Heran Bago

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    I've always wondered, why does Tweaker have two accounts?
     
  6. Dec 9, 2005 #6
    Mask of Destiny

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    So basically there are a few word-values that are little-endian in Sonic 2 (because it uses the Z80 for music) that aren't in other games that use the 68K?
     
  7. Dec 9, 2005 #7
    Tweaker

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    Nibesto is my original account, and I use it at school. Fuck that though, I'm logged in right now, so :P

    I'm not sure if that's the case, but it appears so. Every other Genesis game as far as I know uses the normal voice format in Sonic 1 and etc. The ymx file format is a direct dump of YM2612 registers, so I'm guessing Sonic 2 uses register dumps to apply voices. Not sure at all on that one, though.
     
  8. Dec 15, 2005 #8
    Aurochs

    Aurochs

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    It do. Those voice tables in the sound data are applied directly to the YM2612 registers.
     
  9. Dec 15, 2005 #9
    Dr. D'nar

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    Does the YM2612 have a regulat Z80 or is it a special model like in the Gameboy?
     
  10. Dec 15, 2005 #10
    Tweaker

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    [quote name='Dr. D'nar' date='Dec 14 2005, 09:06 PM']Does the YM2612 have a regulat Z80 or is it a special model like in the Gameboy?[/quote]
    Regular Z80, as far as I know. Originally left in the system for back compatibility with the Master System, it was put to better use as the main sound processor for the Genny. That way, all the CPU cycles are left for more useful things. =P
     
  11. Dec 15, 2005 #11
    Lostgame

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    YEAH! :D

    Sorry.

    Sweet job, Tweaker, you've proved yet again how amazing you are.
     
  12. Dec 17, 2005 #12
    Mask of Destiny

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    [quote name='Dr. D'nar' date='Dec 14 2005, 09:06 PM']Does the YM2612 have a regulat Z80 or is it a special model like in the Gameboy?[/quote]
    The gameboy doesn't really have a Z80 at all. It's an 8080 clone (the Z80 is also an 8080 clone) and like the Z80 it adds instructions to those of the 8080, but the instructions it adds are different.
     
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