(GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download

Discussion in 'General Sonic Discussion' started by Orengefox, Aug 20, 2014.

  1. Orengefox

    Orengefox

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    Some artwork, a ZZT game, and a hack.
    [​IMG]

    [Prototype Cartridge Front] [Prototype Cartridge Back]

    Download GG Sonic 2 Auto Demo Prototype (1991-12-05) Tmr Sega CB06 FFFF v0.00 (JUE)(!)

    I'll let the rest of you fill in the blanks of what you can find in this prototype :)

    Sonic Labyrinth Prerelease - Review Copy:

    [Prototype Cartridge Front] [Prototype Cartridge Back]

    Download GG Sonic Labyrinth Prerelease Tmr Sega CB26 2584 (JUE)


    Tails Adventures Prerelease - Review Copy

    [Prototype Cartridge Front] [Prototype Cartridge Back]

    Download GG Tails Adventures Prerelease Tmr Sega 787C 2583 (JUE)

    Apart from a few odd bytes in Tails Adventures, both the Sonic Labyrinth & Tails Adventures prereleases appear to be the final builds (review copies) despite being on prototype cartridges. These things can happen from to time to time when it comes to finding Sonic prototypes, but at least it's one less thing to track down and we got hold of some pretty cool SEGA GG prototype PCBs. Let's not forget the most important prototype we managed to get, Sonic 2 GG.

    I can't thank you all enough for your donations. If it weren't you folks, none of this would have happened. Be proud!

    Be sure to check out the other stuff I've dumped and released as an added bonus for being so patient with me all this time.

    (DC) Sonic Adventure Trial Version (610-7139)
    (PS2) Sonic Riders Trial Version & Sega Superstars Prerelease Demo
    (Wii) Sonic & The Secret Rings Trial Version (RVL-DSRJ-JPN) - ISO
    (XBOX) Sonic Heroes Review Build (U) (ISO)

    I'll let you folks get on with tearing these things apart now. Enjoy!
     
  2. Laura

    Laura

    Brightened Eyes Member
    Good job OrengeFox.

    I was worried they might all be final builds, hopefully the Sonic 2 prototype will reveal some interesting stuff.
     
  3. Overlord

    Overlord

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    And it's finally here! Fantastic job, dude.
     
  4. steveswede

    steveswede

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    Just want to say thankyou to everyone involved for making this available and preserving Sonic's lost history.
     
  5. Skyler

    Skyler

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    The next audtion
    It begins! Can't wait to see what's lurking around in Sonic 2.
     
  6. ICEknight

    ICEknight

    Researcher Researcher
    Thank you for this release and also thanks to all the people who contributed!
     
  7. AkumaYin

    AkumaYin

    ベーパー Member
    Wow! That Sonic 2 prototype is so different...

    Glad to see that more prototypes have been uncovered!
     
  8. gold lightning

    gold lightning

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    I must point out that this has produced a cleaner version of this:
    [​IMG]
    Well... except for things being realigned between these builds.
     
  9. doc eggfan

    doc eggfan

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    grrrr... why or why did I have to be at work when this happens. Can't wait to get home.
     
  10. BinBowie

    BinBowie

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    Well I converted the ROM to a SMS file so the resolution is bigger so we can see things that aren't normally seen on-screen, of course this corrupts the palette data but lets us see the things that are off-screen in this Demo.
    We can finally have a better look at those bigger trees in Green Hills Zone.

    [media]https://www.youtube.com/watch?v=kQYyYtHpKDo[/media]
     
  11. Ravenfreak

    Ravenfreak

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    Thank you so much. <3 I just came home from hanging out with a friend, scored some pretty awesome merchandise from the mall and now this! Even though I have to go back to work tomorrow, today's been a pretty cool day. :) Time to dig into the Autodemo. ^_^
     
  12. Thanks for your dedication, Orengefox!

    You can achieve the same thing without any modification to the ROM or loss of palette data by enabling "GG FullSMS" in Kega Fusion's configuration dialog.
     
  13. BinBowie

    BinBowie

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    Thanks for informing me on that Hendricks 266. Here is the game in GG FullSMS mode. Basically a version of the video I posted a few minutes before but with the correct colors.
    [media]https://www.youtube.com/watch?v=KXxjRy0rULI[/media]
     
  14. MarkeyJester

    MarkeyJester

    My predecessors have nothing on me. Resident Jester
    A few notes I've picked up so far:

    Offset - Decription

    0B0D - Sonic's art updating routine
    13D8 - Sprite flush related
    26AD - Scroll flush/control related
    8000 - Sound driver

    This next part you WILL be interested in:

    042F - The scene control routine.

    This is a list of calls to each screen that's to display in order....

    042F - 0431 = Intro (Sonic running in the emblem)
    0432 - 0434 = Title screen
    0435 - 0437 = First "Tropical/GHZ" level
    0438 - 043A = Second "Sky High" level
    043B - 043D = Third "Underground" level
    043E - 0440 = The "Coming Soon" screen
    0441 - 0452 = A repeat of above.

    I'm gonna find the control locking routines wherever they are, and see if we can remove the demo control and allow us to explore further.

    EDIT: Found it, offset 0705 is what's controlling Sonic to move, jump and hold down for rolling, specifically.
     
  15. Bluecore

    Bluecore

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  16. Orengefox

    Orengefox

    The world's greatest scientist and soon to be the Researcher
    457
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    Right in front of my computer.
    Some artwork, a ZZT game, and a hack.
    Something I never noticed until just today.

    [​IMG]

    [​IMG]
    [​IMG]

    These screenshots from off a magazine of what might be prototype Sky High Zone uses the same platforms, palette and background you see in the prototype Green Hills Zone.

    There's a chance we might find this in the ROM.
     
  17. So there seems to be only one song indexed, the one that plays through the demo at ID #83 You can check this going to Addres DE03 and changing the value. It has some SFX unused in the demo too!
     
  18. MarkeyJester

    MarkeyJester

    My predecessors have nothing on me. Resident Jester
    [url="http://mrjester.hapisan.com/01_Public/S2GGB%20Control%2002.gg]Download[/url]

    Get exploring retro! Demo time is now removed, and you now have control over Sonic.

    Edit 02: HAH,. there are spikes and functional springs on the level!
     
  19. Jeez you're fast! Thanks!
     
  20. Overlord

    Overlord

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    Holy crap, awesome! Had a quick play around, there is indeed workable springs and other things to play with. Next up, the other levels? =P