The EXT Port is a general purpose connector on the bottom of the GP2X console. It is a 24 pin high density connector as used on some Samsung and LG mobile phones. The EXT port features USB, TV output (S-Video), serial I/O, audio output, JTAG and 3.3V power. The MK2 has been confirmed NOT to supply 5 volt but also 3.3, only the second revision MK2 supplies 5 volt. These were produced since July/August 2006.
|4.||SV_OUT_C||12.||USBD+||20.||+3.3V (Or +5V for 5th revision)|
|5.||SV_OUT_Y||13.||GND||21.||+3.3V (Or +5V for 5th revision) </|
|RXD0 / GPD0|
|7.||GND_TV||15.||JTAG [TCK]||23.||TXD0 / GPD1|
The best available option seem to be to get a USB/serial datacable for the Samsung S810 mobile phone. See also: EXT Port Connectors.
The EXT port support USB host. See USB Host for details.
The EXT port supports TTL serial. See Serial Cable for details.
Break out box
Schematics to create a break out box for the EXT port have been published. See USB Host BoB Schematic for details.
Mk2 GP2X Reset
On the Mk2 GP2X, the function of pin 19 has changed, and it no longer resets the GP2X. Its new function has something to do with the battery voltage, but it's not clear what the function is at the moment.