Sega Mega CD Hacks & Patches

[Mezmorize]

ECCO

Invincibility To Hits (But Not Loss Of Air)

15916900242e

Infinite Air

0C7900E0

Invulnerability

4a3900084b8f666c02

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Flashback

Invulnerability

4a390000b1d667

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[Mezmorize]

Eternal Champions

Infinite Time

0181013b40

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First instance, unless otherwise noted:

5 in 1 Sega Arcade Classics
Golden Axe

Almost Invincibility

6404422A000208E8

[Mezmorize]

Sorry it took me so long to reply, I've been experiencing some hardware pc problems.
Hopefully tomorrow I can get back to hackin' some Sega CD!

First off, thanks for taking interest, and sorry my ISO's are different than yours.
Thanks for takin' the time to post your results, I'm sure it will help someone else out there.

To properly label the regions of the 140 games I have, I decided to make this site:
https://sites.google.com/site/SegaMegaCdPatches/all

As I find out the region, and make a patch for the game in question, I'll then upload the patches there, and still here.
At least finding the region is easy for this system, since the BIOS says Mega CD for (E), Sega CD for (U), and Japanese text for (J) >.>.

Thanks for the Mickey info, I'll have to sit down and actually play it for more than 2 minutes lol.
Some games have the hex string multiple times, and I wondered if those weren't for different stages/levels.

Your not bothering me lol.
I did indeed look into Corpse Killer a few days back.
I have both the CD version and the 32xCD version, neither seemed to accept any button input?

[keeper7]

Mezmorize,
I've manually patch different versions than yours since most games I have is (U) or (J).
I don't know if this can be useful for you or someone else.
Here's the results:

4 in 1 Sega Arcade Collection Limited Edition (J) (same as 5 in 1 but without Monaco GP) [OK]
Amazing Spider-Man vs. Kingpin (U) [OK]
Chuck Rock (U) [OK]
Earthworm Jim Special Edition (U) [OK]
Wonder Dog (J) [OK]
Final Fight CD (U) Invincibility and Infinite Time [OK]
Final Fight CD (J) Invincibility and Infinite Time [OK] (Could you tell me which hex string to modify for invincibility?) <- (Forget it, I found the hex string comparing the original iso with patched one.)
Mickey Mania (U)
Infinite Lives And Invulnerability only works on 1st part of Steamboat Willie so I wonder if this could be happening to Mickey Mania (E).

I don't want to bother you, I know you have other games in mind but did you take a look at Corpse Killer?

Thank you

[Mezmorize]

Wonder Dog (U)

Invulnerability

06536D24

Infinite Lives

426D241261

Invincibility

0000E84A6D2412

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5 in 1 Sega Arcade Classics (U)

Streets of Rage

Infinite Time

44FC0004CD0D4E

P1 Infinite Health

2800326710

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5 in 1 Sega Arcade Classics (U)

The Revenge of Shinobi

Invincibility
3rd Instance

3A6A0831FC0000D13A

Infinite Lives
3rd Instance

4A406A0611FC

[Mezmorize]

3 Ninjas Kick Back (U)
737FE116

Infinite Time

4A387C1B660850F9

Infinite Lives

3D7C002000080C

Invincibility (Can still loose half your health, the Invulnerability code is better, the character don't blink, and you don't have to take a hit before it activates)

3D7C001E009A

Invulnerability

6704536E009A

[Mezmorize]

Couple loose ends to tie up before going to the next game.

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Chuck Rock (E)

Invincibility
2nd instance of

36766a0833fc

Infinite Lives

726a0460

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Amazing Spider-Man vs. Kingpin (E)

Invincibility

1b7c0001d7964a2e

Infinite Web
2nd instance

4A6DD7526C0442

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Batman Returns (U) [FC5A302F]

Forgot I made these patches a couple days ago, not sure the places to manually patch...

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Final Fight CD (E)
Infinite Time

Place a 00 before this hex string

147201

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[Mezmorize]

Thanks a whole lot, I didn't expect you to or anything, it's greatly appreciated.
I basically hack the Game Gear/SMS exactly as I do with PSX, use Cheat Engine with a conversion formula.
It's easy for me to save a memory dump with Fusion and CE, but I'm sure you know how anyway lol.
The best resource of info about the RAM areas is here:
http://www.smspower.org/Development/MemoryMap

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Earthworm Jim Special Edition (E)
Invincibility

This game if your manually patching, it's the 5th instance of this string...

003960f053104e752f

Infinite Ammo

4E754A790002F60E6B

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Jurassic Park (U)
Infinite Time

0C39000000FFAA

--------------------------

Figured I would throw this in there:



http://www.megaupload.com/?d=4YG0U2OD

[Hacc]

Yeah, it's a great skill to have. My method works on all of the systems I have listed on my YouTube channel. The main thing you want to have is a memory dump of the game. I'll try and make an example for a Game Gear game. I never messed with the Game Gear like that (hacked a few codes).

[Mezmorize]

Oh, damn.
That's the #1 skill I would love to have one day, I would scan every game I could lookin' for new unknown cheats.
Maybe if you randomly have a crapload of free time someday, you could show an example of how to trace button presses for something easier than the PSX, like maybe the Game Gear.

Just one game real quick for now.
I plan to make many more Sega CD codes, but I want to get all the games first >.>

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Mickey Mania (E)
Invulnerability

You can manually patch an iso by finding the first instance of this string, and changing the byte before it to 00.

0000085379002006C00C79

Note:
The CRC32 for the unpatched .ISO is in the filename of the patch (for now on).

Edit:
Infinite Lives; find:

666D0000EE30390020

And change the byte before it to 00.

Invincibility; find:

2A33FC0001002006BE

And change the byte before it to 00.

[Hacc]

The only Sega CD game that I checked was Earthworm Jim: Special Edition. I didn't note the button cheat locations if I found them (I always do when I find them for a game). You probably got it confused with the Sega Saturn. The notes I made for the Saturn games I misplaced at the moment.

[Mezmorize]

That is so cool Mezmorize. I really enjoy all of the codes you do here on the site!

Thanks for the comment, your a nice guy!

I'm not an expert but I managed to "hack" my iso file.

Shields at 100% and not decreasing!
Thanks

No problem, glad you knew how to modify the game!

Nice guide, Mez! If I recall correctly, Tony Hedstrom made a similar guide years ago for Sonic CD. The more the merrier, though.

Your right, I did happen to see that a couple days ago.
http://www.angelfire.com/games2/codehut/SonicCDhack.txt

What games were those push-button codes for that you found for the Sega CD, if you can remember?

[Hacc]

Nice guide, Mez! If I recall correctly, Tony Hedstrom made a similar guide years ago for Sonic CD. The more the merrier, though.

[keeper7]

I finally found the train's damage code for Loadstar.

The question is, how are you hex editing skills?
See after loading 2 copies (a proper rip, and an iso/mp3 rip), and mounting with daemon tools etc., I'm not sure which version I'm running lol.

But if you open your disc image with a hex editor and search for this hex string, you can easily manually patch your game.

28 6A 00 F8

After locating that hex string, simply replace the 9C with 00 (before the 28).

I'm not an expert but I managed to "hack" my iso file.

Shields at 100% and not decreasing!
Thanks

[Mezmorize]

I finally found the train's damage code for Loadstar.

The question is, how are you hex editing skills?
See after loading 2 copies (a proper rip, and an iso/mp3 rip), and mounting with daemon tools etc., I'm not sure which version I'm running lol.

But if you open your disc image with a hex editor and search for this hex string, you can easily manually patch your game.

28 6A 00 F8

After locating that hex string, simply replace the 9C with 00 (before the 28).