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[Master System] Marble Zone music found in Sonic 1!

Discussion in 'Engineering & Reverse Engineering' started by Kroc, Nov 23, 2013.

  1. Kroc

    Kroc

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    MaSS1VE: The Master System Sonic 1 Visual Editor
    Hi. I'm doing a complete disassembly of Sonic 1 for the Master System.
    I have found various pieces of evidence to suggest that Sonic 1 was scaled back from a 512K game to 256K some way through development.
    The most amazing thing I've just found is that an 8-bit rendition of Marble Zone's music is present in the ROM!

    You can download a version of the ROM here with the Green Hill music replaced with the Marble Zone track:
    http://camendesign.com/_stuff/S1_MarbleZone.sms
     
  2. Graxer

    Graxer

    Member
    Interesting! I wonder if the Master System/Game Gear version of the game was originally planned to have the same zones as the Mega Drive version. They included GHZ after all, maybe its possible that they started on MZ next before replanning the 8-Bit version.
     
  3. Rika Chou

    Rika Chou

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    Waaaaaaa? Amazing find! To think this was there all this time.....great work!
     
  4. Agobue

    Agobue

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    Brilliant stuff, well done mate!
     
  5. Techokami

    Techokami

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    Damned impressive! I wonder what other hidden goodies lie within this game?
    Also, VGM rip?
     
  6. RetroKoH

    RetroKoH

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    I wonder if there are any remnants of Spring Yard Zone or Star Light Zone as well? I do find it interesting. I wonder why it didn't have identical zones... other than perhaps trying to be a somewhat original experience... but then why replicate half of the zones?
     
  7. Knucklez

    Knucklez

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    Mother of God... I love the sound of it in 8-bit. Please tell me there's more!!
     
  8. Lanzer

    Lanzer

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    ....Why hasn't this man been made insta-member yet?!?!

    Wow shit man nice find, how did we skip over this? is their just not enough research done on the SMS/GG version of Sonic 1?
     
  9. Ravenfreak

    Ravenfreak

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    It's good to know there's someone here making a complete disassembly of this game, mine was rather shitty. :v: Now this is pretty cool never really got too far into hacking this game but judging by your past activity on the wiki page for it you've done some impressive work. It would have been cool to see the 8 bit version have Marble Zone as it is one of my favorite levels in the game. :)
     
  10. Knucklez

    Knucklez

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    That seems to be the case.
     
  11. Mr Lange

    Mr Lange

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    Sonic Utopia, Sonic Overture
    I always thought it was suspicious that Bridge Zone's background was similar to Marble Zone...
     
  12. Mercury

    Mercury

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    What's the offset in the original ROM where the song can be found?
     
  13. muteKi

    muteKi

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    Is there a .sgc file for Sonic 1?
     
  14. Flygon

    Flygon

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  15. ValleyBell

    ValleyBell

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    researching PC-98/X68000 sound drivers
    I would've never thought that Marble Zone could sound so awesome on the MS.
    Here is a .VGM rip.

    It's at 0xCD0A, that's between the Green Hill and Jungle Zone songs.
     
  16. Kroc

    Kroc

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    MaSS1VE: The Master System Sonic 1 Visual Editor
    Wow, what a response -- in just a few hours!

    To answer some questions:

    There are a large number of unused objects in the game which have code, but probably missing graphics for them. (offsets: $9B75, $9BE8, $9C70, $96F8, $96A8, $8218, $83C1, $94A5, $AE35, $B0F4, $8ECA, $8F6C, $BCDF)
    When I can reverse engineer how the objects work I might be able to work out what the AI these objects have and give them new graphics.

    I'm in the middle of unpicking the music data, so I will post here if I find any more unused songs.

    There's a pointer table for the game music at $C716. Green Hill begins at $C7D0 and I discovered Marble Zone wedged inbetween it and the next song. You can find it at $CD0A.
    I used the music notes on the SCHG to unpick the bytes, so credit for this discovery must go to ValleyBell.

    I don't know how to do VGM stuff, but I hope this data helps the peeps who know.

    I've rewritten most of that page already and plan to completely overhaul it. When I started there were a large number of unknown bytes in the level headers and I've now gotten that down to 1: Unknown Byte "9" is actually a bank number for loading the sprite data -- more proof the game used to be bigger -- but I haven't added that info to the wiki yet.

    Since the response has been so nice, I'll share with you my current disassembly -- just be warned that this is only 5% done, but I've mostly got it formatted in ASM and have started commenting it.

    Sonic 1 Master System Disassembly: (23-NOV-13) http://camendesign.co.uk/_stuff/S1.sms.asm
     
  17. McAleeCh

    McAleeCh

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    Wow, this is incredible! Aside from the Basaran/Batbrain graphics found only in the Game Gear version of the game, I wasn't aware of any indication that Marble Zone might have been intended for the Master System version of the game at some point. Congratulations on the amazing find, Kroc! Sonic 1 on the Master System is a game that I've always had a soft-spot for, as my brother's Master System II with the built-in version of Sonic 1 was the first mainstream games console that we ever owned.

    I wonder what other secrets this game holds...

    That reminds me, does anyone know if the built-in version of Sonic 1 has ever been dumped? I can only think of one difference when compared to the emulated versions I've played since then - it didn't display the graphics of Sonic singing into the microphone that the cartridge version shows over the end credits, instead showing the overview of South Island that appears on the intermission screen between levels. That's stuck in my head very clearly - I remember my brother describing the "Singing Sonic" to me when we first completed the game, as he was surprised not to see it given that he'd previously seen it on his friend Rob's copy of the game, which was the cartridge version.
     
  18. Techokami

    Techokami

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    Yep, it's on SonAR as "European_SMS_BIOS_(Sonic_the_Hedgehog)_(E)_[!]"
     
  19. MathUser

    MathUser

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  20. ashthedragon

    ashthedragon

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    Holy shit!!! This is the best discovery I've seen in a long while ( and we have not been short of amazing research results lately...). Sonic 1 and 2 for the Master System are my favourite Sonic Games, and finding something like this is...wow. Great job there!!!