Hacking Playstation

Contents Legal History Hacking using PCSX Gameshark Description Code Types Xplorer Description Code Types Encrypting/Decrypting Gold Finger Description Code Types Game Hunter Description Code Types Joypad Values Normal Reverse Max Normal Max Reverse R3000a Assembly

Legal All files (HTML, CSS, images) included in EnHacklopedia are licensed under the Creative Commons Attribution-ShareAlike 3.0 License. All authors contributing to EnHacklopedia should be made aware of the license before contributing. If the author does not agree to the licensing, his or her contributions will not be accepted into the project. History 04-14-2007 Added more joypad values. (dlong) Fixed typoes, removed 1F code type, adding joypad values for D4-D6 code types. (dlong) 04-13-2007 Updated to latest guidelines standards. (Parasyte) 04-12-2007 Initial release. (dlong)

Hacking using PCSX

To-do

Gameshark

Description

The Gameshark for the PSX was produced by Datel. Initially the Gameshark was a device that would plug into a port in the back of the PSX, but after the port was removed in later models, the Gameshark switched to a CD based system. The PSX Gameshark was similar to the N64 version, even providing a trainer, but contained a few extra code types.

Code Types

Type	Description	Versions
8-bit Constant Write 30xxxxxx 00yy	Writes the value yy to the address 80xxxxxx	All
16-bit Constant Write 80xxxxxx yyyy	Writes the value yyyy to the address 80xxxxxx	All
Slide Codes 5000xxyy zzzz tttttttt vvvv	Writes xx addresses starting with 80tttttttt incremented by yy. The starting value is zzzz with an increment of vvvv. On CD-based Gamesharks, consequtive slides must be seperated by a line "00000000 0000".	2.2+
8-bit Equal To E0xxxxxx 00yy	Executes the next code only if yy is equal to the byte stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
8-bit Not Equal To E1xxxxxx 00yy	Executes the next code only if yy is not equal to the byte stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
8-bit Less Than E2xxxxxx 00yy	Executes the next code only if yy is less than the byte stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
8-bit Greater Than E3xxxxxx 00yy	Executes the next code only if yy is greater than the byte stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
16-bit Equal To D0xxxxxx yyyy	Executes the next code only if yyyy is equal to the halfword stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
16-bit Not Equal To D1xxxxxx yyyy	Executes the next code only if yyyy is not equal to the halfword stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
16-bit Less Than D2xxxxxx yyyy	Executes the next code only if yyyy is less than the halfword stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
16-bit Greater Than D3xxxxxx yyyy	Executes the next code only if yyyy is greater than the halfword stored at 80xxxxxx. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.2+
16-bit Universal Button Code D4000000 yyyy	Executes the next code only if yyyy is equal to the buttons pressed. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.41+
16-bit Codes On Code D5000000 yyyy	Turns on all codes if yyyy is equal to the buttons pressed. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.41+
16-bit Codes Off Code D6000000 yyyy	Turns off all codes if yyyy is equal to the buttons pressed. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.41+
16-bit Increment 10xxxxxx yyyy	Increments the value at address 80xxxxxx by yyyy; use with conditionals. A maximum of 30 increment/decrement codes can be used at a time.	2.2+
16-bit Decrement 11xxxxxx yyyy	Decrements the value at address 80xxxxxx by yyyy; use with conditionals. A maximum of 30 increment/decrement codes can be used at a time.	2.2+
8-bit Increment 20xxxxxx 00yy	Increments the value at address 80xxxxxx by yy; use with conditionals. A maximum of 30 increment/decrement codes can be used at a time.	2.2+
8-bit Decrement 21xxxxxx 00yy	Decrements the value at address 80xxxxxx by yy; use with conditionals. A maximum of 30 increment/decrement codes can be used at a time.	2.2+
Enable All Codes Trigger C0xxxxxx yyyy	If the halfword at 80xxxxxx is equal to yyyy, then all codes are activated. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	2.41+
Code Delay C1000000 yyyy	Delays activation of codes by yyyy. A maximum of 60 conditionals can be used at the same time. This includes Cx codes.	All
Memory Copy C2xxxxxx yyyy 80zzzzzz 0000	Copies yyyy bytes from 80xxxxxx to 80zzzzzz	All

Joypad Values

PSX games can use any one of four different value systems for storing button presses depending on the game. The only way to determine which system is used is to hack the joypad reader itself.

Normal

These are the values used in the GS D4, D5, and D6 code types. Combine buttons by using bitwise OR.

Button	Value
L2	0x0001
R2	0x0002
L1	0x0004
L2	0x0008
Triangle	0x0010
O	0x0020
X	0x0040
Square	0x0080
Select	0x0100
L3	0x0200
R3	0x0400
Start	0x0800
Up	0x1000
Right	0x2000
Down	0x4000
Left	0x8000

Reverse

This alternative button storage method had its values combined using bitwise OR. These values are determined by byteswapping the normal values.

Button	Value
Select	0x0001
L3	0x0002
R3	0x0004
Start	0x0008
Up	0x0010
Right	0x0020
Down	0x0040
Left	0x0080
L2	0x0100
R2	0x0200
L1	0x0400
R1	0x0800
Triangle	0x1000
Circle	0x2000
X	0x4000
Square	0x8000

Max Normal

These values are determined by subtracting the Normal joypad values from 0xFFFF. Buttons are combined with bitwise AND.

Button	Value
L2	0xFFFE
R2	0xFFFD
L1	0xFFFB
R1	0xFFF7
Triangle	0xFFEF
Circle	0xFFDF
X	0xFFBF
Square	0xFF7F
Select	0xFEFF
L3	0xFDFF
R3	0xFBFF
Start	0xF7FF
Up	0xEFFF
Right	0xDFFF
Down	0xBFFF
Left	0x7FFF

Max Reverse

These values are determined by subtracting the Reverse values from 0xFFFF.

Button	Value
Select	0xFFFE
L3	0xFFFD
R3	0xFFFB
Start	0xFFF7
Up	0xFFEF
Right	0xFFDF
Down	0xFFBF
Left	0xFF7F
L2	0xFEFF
R2	0xFDFF
L1	0xFBFF
R1	0xF7FF
Triangle	0xEFFF
Circle	0xDFFF
X	0xBFFF
O	0x7FFF