Earphone Jack

[lostinpsp]

Okay, I have read all the posts and will give it a go to connect up a remote GPS. The question I could not find any where is this....

Why do we have to use the earphone jack plug to connect the PSP to a GPS unit and not use the USB connection already there??

Feel free to shoot me down but this seems to ellude me.

[deniska]

read up on USB protocol.. then look up the threads in ps2dev forums explaining why it is hard to make PSP be a host device..