NOTE: Any modifications to your PSP can permanently damage the device, causing unrecoverable errors (fried motherboard means no PSP).
NOTE: All modifications to the PS2 controller are deemed irreversable. Once done, it will not work for your PS2 anymore.
WARNING: I (nor any of the Cemetech crew) am/are not responsible for any damages done to your device(s) using this guide. Please take care in your decision to proceed with this mod!
Alright, this is a hardware modification to intercept PSP button presses, and inject PS2 button presses. To make it simple, when you press a button on the PSP, a circuit is made. The psp translates the completed circuit as a button press, and reacts appropriately in software. What we're gonna do, is find a point on the completed circuit on both the PSP motherboard, and the PS2 board, and link em. That way, when you press a button on the PS2 remote, it imitates the PSP button press, and the console recieves the command. Vice versa, if you press the PSP button, it still sends the command, since the PS2 remote doesn't cut or handle these commands.
Theres few documentations on the subject, and most of them are for 1 board. This tutorial (will be) based on the PSP TA-085 board.
Problem is, I have to translate the pinouts first. That I'm gonna need some assitance with.
First off, lets get you up to date with what I found out so far:
The official mod can be found here: http://www.acidmods.com/forum/index.php?topic=17761.0
An alternative mod can be found here:
http://www.acidmods.com/forum/index.php/topic,36297.msg273859.html#msg273859
Guide based on ?Joystick? and L2/R2 modification:
http://www.acidmods.com/forum/index.php?topic=15108.0
A full diagram of the PSP slim I'm using and it's components, look here:
http://www.dcemu.co.uk/vbulletin/threads/74258-PSP-Slim-amp-Lite-Disassembly-Tutorial
And my MB diagram is here: (HD 3456x2584, take care)
http://img852.imageshack.us/i/gedc0988.jpg/
Now that you're caught up, I need to get some help in figuring out exactly which pins translate to which pins. Here's what we have on the pins to date: