This would be a nice little mod for you PSOne emulator lovers out there. If I had any do-it-yourself ability in me, I'd do this in a heartbeat.  Hope someone gets some use out of this.  Unless of course someone has already done something like this before :P

There's a video and some pics as well as instructions in this site.

http://www.acidmods.com/forum/index.php?topic=15108.0

Quote:Notes: The following mod requires you to solder to your PSP's Motherboard!
So if you don't know how to use a soldering iron I suggest you don't do this MOD.

This MOD is for the fat PSP, but you can do the same on the Slim.
Although I would never take my Slim apart. :P

This will not affect your PSP's normal play outside PS1 Games!
Everything will work like it should Joystick, D-Pad and all the buttons.

that seems pretty cool, but since i don't know how to solder anything, i can't do it. it seems like a pretty heavy mod though. i wonder if you could use those triggers for normal PSP games instead PS1...

...WHAT!?!

Does this really work? It seem like a lot of trouble just for a psX emulator

Also I probably wouldn't do it. Last time I took my psp apart it took me 5 tries to get it back together fully functional

and the new psx custom buttons thing might affect this