Mez's PSX GameShark Codes.

[Mezmorize]

Medievil USA Debug Menu

This menu is known about in the PAL region of the game, and is enabled by a button sequence.

Here is a GameShark / ActionReplay / CodeBreaker code to enable the options for the USA release.

Debug Options
800EEE3E 0003

[Ace]

I've added these.

[Helder]

your are correct I must have been thinking about another cheat device lol, but yea its the even number as the last 00 in the value and the odd in the first 00 in the value.

[bungholio]

The problem is, the code don't work as a GameShark code, only Cheat Engine seems to make the value stick.

(The value stays 0 until you pick up bullets, it then becomes 16 [10 in hex])

If you are using cheat engine, you might be able to easily find out what modifies the address and delete the line of PS1 code. That way the code that reads it and interprets it can work, but the code that changes it is gone, so it would work.
PS2 cheat devices can modify a game's ASM code, PS1 cheat devices can probably do it too.

Just get a save state before you pick up an item and have the address that changes. With cheat engine, do that thing where you right click it and click find out what writes to this address. Go in the game, pick up an item, and go back to cheat engine. It will give you some addresses. Changing one of those lines to nothing should fix your problem, and then you can add that code to your gameshark and it should work.

[Mezmorize]

on an actual GSPro Hardware you would have to make the codes as follows to make em work.

Thank you.
I tried 800105e8 xxzz, but didn't think about switching to zzxx.

Just tried it and they indeed work as one line.

Edit:
So maybe now someone can find the other correct values to access the locked out areas of the debug menu.

[Helder]

on an actual GSPro Hardware you would have to make the codes as follows to make em work.


Biohazard 2 Beta 2
Debug Menu Action Modifiers

Utility Menu
300105e8 00xx
300105e9 00zz
or
800105e8 zzxx

Jump
300105ec 00xx
300105ed 00zz
or
800105ec zzxx

Memory Viewer
300105f0 00xx
300105f1 00zz
or
800105f0 zzxx

XA Play Test
300105f4 00xx
300105f5 00zz
or
800105f4 zzxx

OBJ Atari Disp
300105f8 00xx
300105f9 00zz
or
800105f8 zzxx

Shori Check Disp
300105fc 00xx
300105fd 00zz
or
800105fc zzxx

Monosashi
30010600 00xx
30010601 00xx
or
80010600 zzxx

Known Values:
First line xx = a4
Second line zz = 36
Result = Jump (Warp)

[Mezmorize]

Here's a new cheat table, I redid it with the pSX you linked, I also added a few other codes.
I found the address that enables you to access the debug menu if you set it to 00 it stops you from being able to access it, it also pauses the game.
I couldn't find anything else to unlock the other options though
Room Warp is kinda too it stores the room ID for every stage say if you set it to 11D then change it to 702 it'll store both 1D and 02 when you jump to either 1XX or 7XX.
With Cheat Engine is there anyway to get it to keep the description width the same every time you open it? I have to readjust it every time to see my full descriptions

Cool, I'll check it out when I get home from work. I'll merge your table with mine and see what we can hack.

I found a (useless) code to remove the black background of the debug menu.

I'm not sure about the width of CE, I know the height stays like you had it before closeing it out.

P.S. If you are using the same pSX I use, it's best to keep it on the desktop.
That way when you click on 'Insert CD Image' and then click the desktop browse button, you see the virtual folders 'cdimages' 'cards' etc.

Hidden included apps, click images to see it bigger.

Edit:
Seems our codes are off by a bit.
My 'Debug Selector' Cheat Engine address:
024AA849
Your 'Debug Menu: Selected Menu Item' address:
0268A849

Here's my cheat table merged with yours, but I had to modify your address to get them to work for me.

I use an emulator mostly because of save states to quickly be able to change values to search for codes.
When I learn the proper values to search for, that's when I'll load up the real PlayStation and find the GameShark code.

So here's some GameShark codes instead.

I'm sure these codes could be converted to one single code per entry or whatever, but I'm still learning.
Didn't really read the 'Secrets Of Professional Gameshark Hacking' yet, I like figuring stuff out on my own usually.

Biohazard 2 Beta 2
Debug Menu Action Modifiers

Utility Menu
800105e8 00xx
800105e9 00xx

Jump
800105ec 00xx
800105ed 00xx

Memory Viewer
800105f0 00xx
800105f1 00xx

XA Play Test
800105f4 00xx
800105f5 00xx

OBJ Atari Disp
800105f8 00xx
800105f9 00xx

Shori Check Disp
800105fc 00xx
800105fd 00xx

Monosashi
80010600 00xx
80010601 00xx

Known Values:
First line xx = a4
Second line xx = 36
Result = Jump (Warp)

[kh2k4]

Here's a new cheat table, I redid it with the pSX you linked, I also added a few other codes.
I found the address that enables you to access the debug menu if you set it to 00 it stops you from being able to access it, it also pauses the game.
I couldn't find anything else to unlock the other options though
Room Warp is kinda too it stores the room ID for every stage say if you set it to 11D then change it to 702 it'll store both 1D and 02 when you jump to either 1XX or 7XX.
With Cheat Engine is there anyway to get it to keep the description width the same every time you open it? I have to readjust it every time to see my full descriptions

[Mezmorize]

I've been hacking beta 2 with cheat engine too with epsxe v1.7,
I noticed that Background Image and location ID stay the same all the way up the RPD but when you enter the RPD it changes
Here's my cheat tables for Biohazard 2 - Beta 2 and Resident Evil 4 (PC).

I downloaded your cheat table, but the address are off since I'm using pSX.

it might also be a case of outside the GSpro's range whats the cheat engine code

I can't tell you the code for cheat engine at the moment, I'm at work right now.
I don't think it's out of the GSP's range, since I was able to find the code.

In the GSP, the code on the right side of the possibilities window shows the value I changed it to, but the code on the left side shows a different value.

[Hybrid]

it might also be a case of outside the GSpro's range whats the cheat engine code

[kh2k4]

Yea, I know.
I have made a code for him to be there weather or not you pick up ammo on normal difficulty.
The problem is, the code don't work as a GameShark code, only Cheat Engine seems to make the value stick.

(The value stays 0 until you pick up bullets, it then becomes 16 [10 in hex])

I've been hacking beta 2 with cheat engine too with epsxe v1.7,
I noticed that Background Image and location ID stay the same all the way up the RPD but when you enter the RPD it changes
Here's my cheat tables for Biohazard 2 - Beta 2 and Resident Evil 4 (PC).

[Lazy Bastard]

That sounds a little like the rate of constant-write for the GSPro is not as fast as that of Cheat Engine. I've encountered that problem with other hacking systems.

[Mezmorize]

Brad only shows up if you don't pick up any items on the way to the RPD whilst playing on normal difficulty no zombies appear on the grass section near the RPD either.

Yea, I know.
I have made a code for him to be there weather or not you pick up ammo on normal difficulty.
The problem is, the code don't work as a GameShark code, only Cheat Engine seems to make the value stick.

(The value stays 0 until you pick up bullets, it then becomes 16 [10 in hex])

[kh2k4]

Brad only shows up if you don't pick up any items on the way to the RPD whilst playing on normal difficulty
the zombies don't appear on the grass section near the RPD either.

There's also the phantom gate easter egg
http://www.the-horror.com/forums/showthread.php?t=1319

[Hybrid]

yeah i remember that zombie it shouldn't be too hard to figure out

i like the actual challenge of figuring it out on the real console

i saw that and tried modifing the bytes around there and i coun't change the menu
anyway i'm gunna look into the code for the zombie