Stemming from gr8npwrfl over at ps2dev is a little black box prototyping the concept of USB to the PSP serial interface. No modifications to the PSP hardware — just hacked with piKey installed –

I currently have completed the USB mouse driver and a USB Keyboard driver. I am currently debugging the gamepad drivers for the XBOX 360 wireless gamepad, the PS2/PS3 wireless gamepad, and the Logitech Wingman wireless gamepad.

And to top it all off –

Now that you have seen it, I will also say that yes I have tested a USB hard drive on this interface and can we say Sloooooooooooow.

It was never intended to do hard drives through the serial port anyway, but I did it to say yes it can be done. Besides I had the driver code for a mass storage device.

Oooh-la-la.

For further technical details and whatnot, follow the source link; she’s an interesting read. Nice work gr8npwrfl.

- source: ps2dev