The ATmega8 and ATmega168 don't support JTAG, which is why there's no header for it on the board. The ATmega168 has some sort of one-wire debugging functionality on the reset pin, but I've never tried it.
The ATmega8 and ATmega168 don't support JTAG, which is why there's no header for it on the board. The ATmega168 has some sort of one-wire debugging functionality on the reset pin, but I've never tried it.