"Hey all talk a look at my Microsoft Xbox360 Chatpad connected to my PSP Phat and Slim. Thanks to Jean over at ps2dev.org and this project that he developed we can all have nice keyboards connected to our PSP's.
My PSP’s are running CFW 4.01 M33-2, a special version of piKey and a custom flash on the Chatpad. Text input is a breeze and it works with the Sony OSK (on screen keyboard) and the Danzeff OSK under AFKIM. It does not work with PSPWrite and other ZX-81 applications because they are not compiled to do so but Jean is working on a compatible drive to make them work natively.
Here is the current status as taken from ps2dev.org
I'm working on:
-scancode advanced driver (pikey input driver)
-recompilation of most famous homebrews to enable openKeyboard (direct or through pikey stub) support
-pikey output driver to fake PSPrint presses (to use on dosbox and in other older hb)
-pspirkeyb fake driver
Please Discuss and tell me what you think. If you would like more info go to PS2DEV.ORG
If you’re a PSP programmer and want to help out contact Jean
(Edit) I forgot to mention in the Video that there is headphone pass through. When you first turn on the PSP even with the keyboard plugged in the PSP speakers still play sound. However when you want the sound to go to the headphone port you just need to press one of the Volume buttons."
There's a video in the link
From: l0rdnic0 at acidmods