USB Host BoB Schematic
I have provided the schematics for my Break Out Board free of charge.
If you can't be bothered building a peripheral yourself, please see my site:
EXT Port Connection:
Warning: according to this thread, the JTAG pinout is wrong.
The JTAG pinout is correct. Several people have made JTAG adapters successfully using that pinout. I (Robster) have a JTAG adapter that works on an early First Edition GP2X and also a Mk2 GP2X. It's possible that GPH have altered the pinout for other versions, but pretty unlikely.
Note: on Mk2 GP2X, the nRESET line function has changed, and it no longer resets the GP2X.
Convert 6-20V to 5V:
Please note that VUSB must be 5V!
(Not supplied by the GP2x)
S-Video to Composite:
RS232 Level Shifting: