Sega Mega CD Hacks & Patches

[Mezmorize]

Indeed, thanks Hacc!

I'll have to go back and re-visit some past games now (SMS/SGG).
I was surprised how easy this method is.

[Hacc]

Indeed, thanks Hacc!

I'll have to go back and re-visit some past games now (SMS/SGG).
I was surprised how easy this method is.

You're welcome.

Congratulations, on finding your first button cheats! You catch on fast!

Good finds Mez.

Hacc, thanks for posting the button cheat info. The only way I knew how to search for button cheats, was to look for strings of button values in the ROM (ie. Right = 08, A = 40, B = 10, etc). It was easy to find strings of known button cheats, but not so good at finding unknown cheats. I'm guessing that many/most games don't even use that method for button cheats. The few that I found that do use that method are: Sonic 3, Knuckles, Shining Force 2, and Ecco the Dolphin.

I'll have to try the method you described on a few games.

You're welcome.

That's the method I normally use for Genesis, SNES, etc games. A lot of games work with this method. It works best on PlayStation games, though. I've found dozens of codes with it.

[Jarun]

The ROM value of 0x60 equals out to be 45 MPH.
The value 0xFF makes the speed dial go off the charts, it's hard to say how fast really.

I thought it was pretty funny that you get towed at a faster speed than you can travel by default (45 MPH).

Edit:
The decimal value of 96 (RAM) = 45 MPH so you can kinda guess...

decimal value of ram? I am confused. Where does 96 come from?

With the max speed code I timed it at 1 mile every 30 seconds. So thats about 120mph. Lol So that would be a 3 hour bus ride. I might just test that on kega. Supposedly there is a day night cycle. But I don't think that is tied into the internal clock. I wonder if it is by miles or time.

Can you make a patch that would make max speed 70? or 65, 69 something still on the speedometer to see if it would still register.

[Mezmorize]

I loaded it up again and just changing the speed a little over the default makes the speedo go off the scale, sorry.

Fusion has a Fast Forward option, if that's any help to 'ya.

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

Some more push-button cheats for the Sega CD.

DEBUG         	LRRU
STAGE SEL     	DLURURDL
END PAUSE     	RRDU
PAUSE OFF     	UDLL
TEST MODE     	UDRLU
320 MODE      	RLRLDDUU
MUTEKI        	LDLRUDLD
STAGE CLR     	DDRU
MUGEN         	RLDUUDLR
COMMAND		ULRURLDD ULDR
SE TEST		RDULDU

U=UP
D=DOWN
L=LEFT
R=RIGHT

With the command code, it just makes the other codes appear on screen.
Press each button 4 times until you reach the space in the code.

SE Test shows up in the Options Menu.

[Hybrid]

weill thats a simple math problem at 96 value being 45mph each 1 in the value equals 0.46875
multiply 0.46875 * 255 = 119.53125mph to be exact

149 to 150 if give you approxamately 70 mph

[Mezmorize]

I've came across another type of the button cheat storage in RAM.
This is the 2nd time I seen it, but didn't understand it at first.



This is how the 'Debug' code for the Sega CD game Silpheed is held.

The first byte is the standard button counter.
But, it always counts 0-F instead of resetting to 0 on a wrong button press.

So, the next 16 (0-F) bytes after the button counter is what holds the values of the button that was pressed.
In the picture the first byte is the number of buttons it takes to activate the code, and next bytes is the buttons to activate it.

04 40 10 01 02 01 01 04 08 20 08 02 10 00 00 00
Is 13 button presses of Left, A, B, Up, Down, Up, Up, Left, Right, C, Right, Down, B on controller 2.

So to cheat this code in RAM you would need to poke 14 bytes (at least).

[Jarun]

This just in. Desert Bus is by distance, not time. Looks like my math was correct. Max speed code puts you at 120mph as the trip ended at 3 hours 2 min.

[Hybrid]

damn wish i could find button codes

[Mezmorize]

Android Assault

Invulnerability (6002) [Only tested the 1st of 14 instances]
[|GG]000E600E02477FFF0807000D670400470100[/|GG]

Infinite Lives (6002) [Only tested the 1st of 14 instances]
[|GG]E61E640A4278E61E317C0001000E30874E75[/|GG]

[Mezmorize]

Batman and Robin

Infinite Time (6004)
[|gg]0001856C42790001856E0C79000F0001856C6ECA[/|gg]

Infinite Damage (6004)
[|gg]000185744279000185780C790046000185746D00[/|gg]

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Battlecorps

Infinite Blue Weapon [Starts with 99 rounds] (6004)
[|gg]000100014A280001660000066100FE0E4E7541F9[/|gg]

Infinite Flame Thrower (6002)
[|gg]00014A106A0A10BC00006100FF7C[/|gg]

Infinite Bombs (6004)
[|gg]000100041168000400036E046100FD2A4E7530BC[/|gg]

Infinite Shields (6004)
[|gg]0000F9E26A3042790000F9E291790000F9E46A22[/|gg]

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

Bram Stoker's Dracula

Infinite Lives (6002)
[|gg]10C46A00000C51EE0F6950EE0F6B4E7550EE[/|gg]

Invincibility (6002)
[|gg]10C26A00002250EE0F693D7C300010C2536E[/|gg]

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

[Mezmorize]

Had to leave work early 'cause the snow, so here's some codes:

Brutal Paws of Fury

P1 Infinite Health (6002)
[|GG]00226A1A4269002208030001664042690000[/|GG]

Damn it. Forget the above code, it makes P2 Invincible also >.<

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

Cadillacs and Dinosaurs

Infinite Time (6002)
[|GG]004B4A2C004B6C42062C003C004B532C004A[/|GG]

Infinite Damage (6002)
[|GG]0052600E4A786A6C660820786A565A680052[/|GG]

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

Keio Flying Squadron

Invulnerability
Infinite Lives

Is another game that needs a Master Code for the game to boot.

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

[Mezmorize]

Lethal Enforcers 2

Invincibility (6002)
[|gg]00016624227B1048267B103C4A79000092A4[/|gg]

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

Masked Rider - Kamen Rider Zo, The

Invincibility (0000)
[|gg]F01A04B90000006400FFD0586A00000842B9[/|gg]

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

Mighty Morphin Power Rangers

Invincibility (6002)
[|gg]001C4CDF00034E7548E7800061D670086100[/|gg]

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

[Sephiroth6666]

I love Earthworm Jim. Now temptation has set in and have no choice but to download the Sega CD version. I used to have an actual Sega CD and the game and missed playing this version alot. Thanks for the patch Mezmorize. Great job!!

[Sephiroth6666]

Mezmorize, if you could actually make a disc cheat device for Sega CD, you could make ALOT of money fast since SEGA themselves never made a cheat device for this console. I never heard the reason why they didn't. Weird.

[keeper7]

After reading Tony Hedstrom's Gens Tracer Guide and M68000 Instructions Manual, I think I'm beginning to understand how to make cheat codes.
I made some all by myself.
Well, sort of...
Chuck Rock 2, Flashback and Mortal Kombat I just converted existing Mega Drive Galoob Game Genie codes. You can find same strings on both versions, cartridge and CD-Rom.
Mezmorize, I hope you don't mind if I put them here.

__________________________________________________ _____

Chuck Rock II - Son of Chuck
Invincibility
Note: Still lose energy if you fall on lava or spikes.
(675E)
[|gg]4A6D0BBC6658[/|gg]
__________________________________________________ _____

Corpse Killer (U)
Infinite Health
Note: If you shoot Dark Shadowman you'll still lose energy.
(6002)
[|gg]F5E80C780001F5E86A000010[/|gg]

Infinite Bullets (6002)
[|gg]5278F5024A[/|gg]

99 ND Bullets (63)
[|gg]F5EB11FC[/|gg]

99 APD Bullets (63)
[|gg]F5ED4A38[/|gg]
__________________________________________________ _____

Corpse Killer 32X (U)

Infinite Health
Note: If you shoot Dark Shadowman you'll still lose energy.
(6002)
[|gg]F5EA0C780001F5EA6A000010[/|gg]

Infinite Bullets (6002)
[|gg]5278F504[/|gg]

99 ND Bullets (63)
[|gg]F5ED11FC[/|gg]

99 APD Bullets (63)
[|gg]F5EF4A38[/|gg]
__________________________________________________ _____

Crime Patrol (U)

Infinite Bullets (6002)
[|gg]00004EBAFC2E[/|gg]

Infinite Lives (6010)
[|gg]4A906E5C2EB9[/|gg]
__________________________________________________ _____

Flashback (U)

Protection from some falls (6004)
[|gg]FFFF0008102E[/|gg]
__________________________________________________ _____

Mortal Kombat (J) or (E)

Start on match with Goro (1st Instance) (000B)
[|gg]00008E8833FC000100008F5C[/|gg]

Start on match with Shang Tsung (1st Instance) (000C)
[|gg]00008E8833FC000100008F5C[/|gg]

__________________________________________________ _____

Tomcat Alley (U)

Infinite Missiles/Escape (6006)
[|gg]42B900FFD7B2[/|gg]
__________________________________________________ _____

Who Shot Johnny Rock¿ (U)

Infinite Money For Doctor (1st Instance) (0000)
[|gg]00FFABCC6A2C33FC0000[/|gg]

Buy Ammo For Free (6004)
[|gg]00FFABCC067900C8[/|gg]

P1 Start With 9999 Bullets (270F)
[|gg]33C000FFBBA633C0[/|gg]

Don't Lose Money After Shoot An Innocent (0000)
[|gg]00FFABCC6A64[/|gg]