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JTAG stands for "Joint Test Action Group"
It is a hardware method of talking to memory and flash without requireing any app running on the hardware. In other words: mess up your bootloader and your device is a brick? Use JTAG to install a new working loader.
More info can be found on
including the schematics
the Bill of Material
The JTAG dongle hardware distribution from Holly Gates. Contains all gerber files to build your own dongle.
TimRiker does not have full info on the jtag connector pin outs yet. You need to solder on a 13 pin header to J100 as on the picture below. You may want to solder it on the bottom so that the pins face towards the back and then cut a hole in the back of the case. More pics on this later.
To make a cable you will need a few parts. This right angle header from RadioShack should work for a connector on 1.5 phones. (13 * 3) = 39 It says it's a 40 pin header, but it's really only 20 pins.
At least a 16 possition connector for the dongle side:
and at least a 26 pin for the other side
and 16 conductor cable, note RS only listed a 20 conductor and that mignt not be available now.
You may want to cut a hole in your case and route the header out that way:
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