[RELEASE] Biohazard 1.5 Hacks

[AleX_Red_07]

I apologize if a little off topic.
Recently I figured in technology analysis and collection psx games.
I understood biohazard 2 beta 2, and reassemble it so that it is fully working, that is, XAS and STR files also work.
After this success, I decided to replace the background of TITLEJ.PIX bio2trial for bio2beta.
After CAPCOM video game that does not show.
Why is that?
After all files have the same size?
Please help me that I gave wrong?

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

And how it is possible to replace the RDT or BSS files if it is possible?
If you can edit through the hex rdt and EXE files that is whether what may be a small tutorial about it? Thank you =)

[Graco]

Ah, I see. Thanks for all these codes though. Can't wait to get a chance to try them out.

[Upaluppa]

How difficult would it be to replace an ammo type with grenade launcher ammo data from RE2 so that the same results could be achieved?

That's what IGAS has been doing, but it far exceeds my knowledge, I'm sorry...
For now we'll have to do without working hand grenades, flame throwers, grenade and rocket launchers I guess.

One really cool update we might get soon are fixes for the SPAS-12 (without Gameshark) and the disappearing Zombies and headless Zombies not staying dead bugs. SolidSnake11 (https://www.youtube.com/user/roberto67024/videos) has made some promising progress with these!

That's probably the best thing we can get until IGAS releases their restoration project.

As much as I'm interested in learning how ASM and PSX code injection works, I simply don't have the time to look into it.
It's not something you can learn over the course of a few weekends...

[Graco]

How difficult would it be to replace an ammo type with grenade launcher ammo data from RE2 so that the same results could be achieved?

[Dark Biohazard]

Once again, great work Upaluppa and thanks for the new codes!

I was going to just mention that you could use the same method you used to fix the SPAS, but with the Ingram M10, using the behaviour of the HXOK MC51.

[Upaluppa]

Awesome! Can you fix the grenade/rocket launchers in a similar way to your SPAS-12 solution? Or do they have deeper issues which makes them crash the game?

Unfortunately not, you see, I fixed the SPAS-12 by replacing it's ammo type with that of the Remington.
This works well because both are shotguns.

For the grenade and rocket launchers no ammo type has been programmed into the game and we have no other weapons with similar ammo either...
The only other weapon I can fix that way is the Ingram M10:

SPAS-12 Fix + Ingram M10 Fix (L2=SPAS R2=Ingram)
D00AC758 0001
800ACA5D 0008
D00AC758 0002
800ACA5D 0013
D00AC758 0002
800B10AD 00FF
D00AC758 0002
800B10B1 00FF
D00AC758 0002
800B10B5 00FF
D00AC758 0002
800B10B9 00FF
D00AC758 0002
800B10BD 00FF
D00AC758 0002
800B10C1 00FF
D00AC758 0002
800B10C5 00FF
D00AC758 0002
800B10C9 00FF
D00AC758 0002
800B10CD 00FF
D00AC758 0002
800B10D1 00FF

The L2 button fixes the SPAS while the R2 button fixes the Ingram M10 and adds full ammo to all slots.
The muzzle flash isn't in the correct place, but otherwise it works fine.

[Graco]

Awesome! Can you fix the grenade/rocket launchers in a similar way to your SPAS-12 solution? Or do they have deeper issues which makes them crash the game?

[Upaluppa]

Improved Puzzle Mode Code

I made the Chief Irons Puzzle a bit easier to access, here's an improved code:

Irons Puzzle Mode (L2ON+CameraFixR2UnusedAngle)
800B25BF 0007
D00AC758 0001
800B25BF 0004
D00AC758 0001
800B25CA 0000
D00AC758 0001
800B0FE4 0004
D00AC758 0002
800B25BF 0002
D00AC758 0002
800B0FE4 0006

This code replaces the Item Menu with the Puzzle Mode Screen.
If you press Start during gameplay you'll get a glitched screen at first.
Don't worry, simply press the L2 Button to properly activate the Puzzle Mode Screen!

While in Puzzle Mode you can press L2 again to reset the puzzle or press the R2 button to exit!
There's a strange bug in the game which makes Leon/Elza glitch when walking backwards or using stairs after leaving the Puzzle Mode.
I don't know what's causing this or if it can be fixed...

UPDATE:

I added a way of accessing the correct camera angle for the puzzle!
Getting it to work is a bit tricky.

First, go to the Debug Menu and select Room 115 (Chief Irons' Office) from the Room Jump list.
Now press the Square Button to warp to the room and then quickly press L2 BEFORE the room has finished loading.

Careful, if you press L2 before pressing Square or after Irons' Office has already loaded it won't work and might even crash the game.
As a little bonus, if you press the R2 button while loading the room you'll get to see an unused camera angle of Irons' desk instead!

UPDATE2:

I also improved the codes for the Unused Character Select Menu and the SPAS-12 Fix:

Unused Character Select (L2ONR2OFF)
D00AC758 0001
801026C5 0002
D00AC758 0002
801026C5 0000

Simple, just press L2 on the title screen to go to the hidden character select menu.
Alternatively press R2 to return to the title screen.

SPAS-12 Fix + Inf Ammo (L2FixR2Ammo)
D00AC758 0001
800ACA5D 0008
D00AC758 0002
800B10AD 00FF
D00AC758 0002
800B10B1 00FF
D00AC758 0002
800B10B5 00FF
D00AC758 0002
800B10B9 00FF
D00AC758 0002
800B10BD 00FF
D00AC758 0002
800B10C1 00FF
D00AC758 0002
800B10C5 00FF
D00AC758 0002
800B10C9 00FF
D00AC758 0002
800B10CD 00FF
D00AC758 0002
800B10D1 00FF

AFTER equipping the SPAS-12 press the L2 button to fix the Zombie crashing and ammo reloading issues.
As a bonus, pressing R2 at any time will give you 255 Ammo for every slot.

UPDATE3:

Here's some debug related codes I hacked today, nothing fancy but I thought I'd share them anyways:

Debug Menu Modifier
8008F618 00XX

01 = Debug Menu
02 = Normal Gameplay
03 = Memory Viewer
04 = Unused

Show Item Debug Text
300B2668 0003
Hide Item Debug Text
300B2668 0000
Show Door Debug Text
80072EC4 00FF
Hide Door Debug Text
80072EC4 0000

These two only work in the Vanilla Build, MZD disabled all debug text outside of the Debug Menu.

Disable Music (L2ONR2OFF)
D00AC758 0001
800BBD84 0000
D00AC758 0001
800BBD8C 0000
D00AC758 0002
800BBD84 0003
D00AC758 0002
800BBD8C 0001

Useful in those Laboratory rooms which have that super annoying Alarm music.

Take Items Without Air Jesus Glitch (Press L2 or R2)
D00AC758 0001
30072D3B 0004
D00AC758 0002
30072D3B 0005

I know it's pointless after Martin's newest patch, but whatever...

Have fun!

[Dark Biohazard]

Yeah, I'm really looking forward to a new patch from SolidSnake11.

Me too!

Apparently his monitor is currently broken or something like that, that's why he can't work on new hacks at the moment...

Yeah, I read that, I hope he can come back soon.

The only problem I know about is that the Zombies in the Lobby and the Lobby Corridor will no longer respawn if you fix the disappearing bug.

Exactly, but I personally have not problem with that, you can't get both things.

Unfortunately I don't know any ASM, so I have no idea how to disable the routine that makes the Zombies disappear.
I don't think it can be achieved via memory hacking, you have to hack the executable file for that...

I see, thanks for the reply!

[Upaluppa]

Hey Upaluppa, you think you can find a way to achieve the zombies not disappear after killing?

As you can know already, SolidSnake11 achieve it, but unfortunatelly according to him, it causes some strange bugs in the game...

Yeah, I'm really looking forward to a new patch from SolidSnake11.
Non disappearing Zombies would be awesome!

Apparently his monitor is currently broken or something like that, that's why he can't work on new hacks at the moment...

The only problem I know about is that the Zombies in the Lobby and the Lobby Corridor will no longer respawn if you fix the disappearing bug.
In the final build of 1.5 the killed Zombies were supposed to shrink until they disappear whenever a new one spawns, similar to the Moth Larvae in the final RE2 or the Snakes in RE1.

Unfortunately I don't know any ASM, so I have no idea how to disable the routine that makes the Zombies disappear.
I don't think it can be achieved via memory hacking, you have to hack the executable file for that...

[Dark Biohazard]

I just have give it a try and is interesting, thanks again Upaluppa!

Can be great if we achieve to activate it properly, well maybe a day... haha.

Hey Upaluppa, you think you can find a way to achieve the zombies not disappear after killing?

As you can know already, SolidSnake11 achieve it, but unfortunatelly according to him, it causes some strange bugs in the game...

Well, anyway, I hope you can find more interesting codes!

Greetings.

[Upaluppa]

This is a neat one. It was supposed to be accessible in Chief Irons' office.

When you can get it working, you place the cursor over the round building (lower right) and it opens up. It's revealed to be hollowed out, presumably for a hidden key.

Strange thing about this is that the script (scd file) is located in the DATA folder, iirc, and not embedded into the RDT.

I managed to get it to work!
After using the code 800B25BF 0004 to turn the Status Menu into the Puzzle Screen change the value to 07 to activate the controls!

Turns out that the round building contains a keyhole:

There's a safe hidden underneath the 3D model of the city miniature which would probably open up if you used the correct key on that keyhole.

The same feature was also used in other locations in the final build, inside the Factory, for example:

Shame that item interaction has not been implemented in this early build of 1.5, this would've been a fun puzzle to try!

[MeganGrass]

Hello there, I was bored today and did some memory hacking in 1.5:

I accessed this by modifying the Status Menu but I can't get it to work correctly yet...

This is a neat one. It was supposed to be accessible in Chief Irons' office.

When you can get it working, you place the cursor over the round building (lower right) and it opens up. It's revealed to be hollowed out, presumably for a hidden key.

Strange thing about this is that the script (scd file) is located in the DATA folder, iirc, and not embedded into the RDT.

[Dark Biohazard]

Awesome work!

Thanks for share the codes, can't wait for more!

[Upaluppa]

Puzzle Mode?

I was bored today and did some memory hacking in 1.5:

I accessed this by modifying the Status Menu but I can't get it to work correctly yet...
It constantly flickers on and off and you can't interact with anything on the screen.

I'm sure I'm missing something, if anybody's interested in giving it a try, this is the code that turns the Status Menu into the Puzzle Mode Screen:
Status Menu Modifier
800B25BF 00XX

01 = Status Menu
04 = Puzzle Examine Mode
05 = Item Box Mode (Non-functional)
07 = Activate Puzzle Mode Controls (Use this after setting it to 04 first)

Puzzle Mode Cursor ON
800B25CA 0001
Puzzle Mode Selected Option
800B25BC 00XX

00 = Check
01 = Manage/Combn
02 = Exit
03 = Take
04 = Use

Room Jump to Irons' Office and activate this code before the room has finished loading to get the correct camera angle for the puzzle:
Chief Irons Office Hidden Puzzle Camera Angle
800B0FE4 0004

By the way, there's a second unused camera angle in Irons' Office:
Chief Irons Office Unused Camera Angle
800B0FE4 0006

Some other codes to mess around with, not sure if they are useful:
Move While In Status Menu
800B29AC 0001
Reset Game
800B2924 0002
Freeze Puzzle Mode Screen
800B281E 0001
Open Status Menu
800B29A4 0001

Status Menu Modifier 2
800B25C1 00XX

00 = Show Status Menu
01 = Show Map
02 = Show File Viewer
03 = Item Select

Show Item Description
800B25C2 0009
Knife Equipped
800B25C8 0080
Item Menu Has 6 Slots
800B0FBC 0006
All Slots Infinite Ammo
800B10AD 00FF
800B10B1 00FF
800B10B5 00FF
800B10B9 00FF
800B10BD 00FF
800B10C1 00FF
800B10C5 00FF
800B10C9 00FF
800B10CD 00FF
800B10D1 00FF
Infinite Health
800ACAEE 0064

I also "explored" this unused sewer room by changing the room ID of L Tunnel 2:



Access Room 201 Zonbie Tunnel:
800B0FE0 0001
800B0FE2 0001

Level Modifier
800B0FE0 00XX

00 = Level 1 RPD
01 = Level 2 SEWER
02 = Level 3 FACTORY
03 = Level 4 LAB 1
04 = Level 5 LAB 2
05 = Level 6 TRAIN

Room Modifier
800B0FE2 00XX

00 = Room 00
01 = Room 01
02 = Room 02
etc.

Level 1 RPD goes up to Room 27, all the other levels have less rooms.
There's no point in using values greater than 27, it only results in crashes.

The Level/Room Modifiers only work in the Magic Zombie Door Build (and Martin's hacks of it), they crash the game in the Vanilla Build.
Use them to explore the backgrounds of rooms without RDT data ingame.

By the way, I realized that you can get the SPAS 12 to work without crashing by equipping it first and activating this code afterwards:
SPAS 12 Fix
800ACA5D 0008
Have SPAS 12 Inf Ammo
800B10AC 000D
800B10AD 00FF
800B10AE 0001

It simply gives it the behaviour of the Remington M870.
It's not a perfect fix but still fun to try.

More to come, I'll keep you updated when I find something else of interest!

Small Update:
I found an unused character select menu on the title screen:

Title Screen Modifier
801026C5 00XX

00 = Title Screen
01 = Main Menu
02 = Unused Character Select
03 = Load Game Menu
04 = Config Menu

I guess this is from an even earlier build in which the Main Cast Screen did not yet exist...