from the schematic of the ext port on the gp2x wiki site i saw that there were 4 pins that dealt with usb information transfer - pins 9, 10, 11, and 12. 9 and 10 are labeled USBH1- and USBH1+ respectively. Pins 11 and 12 are USBD- and USBD+. I assume H stands for Host and D for Device.
I'm...