I recently got an LPCXpresso board, which you can cut and make into a debugger. I wanted to use the 0.1″ header (J4) and not the specified JTAG (2×10 0.5″) header. Here is how I cut my board such it can be plugged back together: the female header is just half an IC socket:
Counting pin 1 at the top of the board (near J49), the pinout is:
RTCK is not present on this header, it’s only on J5. You may wish to consider not mounting pin 7 (+5V) since if you ever connect the plug wrong this will give you serious trouble, since +5V at high current is available. I ended up removing pin 7 and plugging it, so I also used that as a key on the other side of my connector. This prevents me from plugging in something backwards.