I have been using the JTAG ICE mk II for a year on this same project. We purchased a couple of LEDZ JTAG ICE ISP clones so we could have production AND engineering be able to debug the systems. Well, I can get the JTAG ICE into program mode both in the ICE and ISP mode. When I try to connect to the JTAG ICE in the debug mode, AVR studio says it can not connect. Does anyone have a solution for this? Is there a difference I am NOT seeing between the JTAG ICE and JTAG ICE mk II pinout that could be causing this problem? I really do think it is my problem, because LEDZ has not been able to come up with a solution and they have been quite helpful. I need to get this to work and I am going to turn the boards soon, so I need to get this working and get it into the turn.
Oh yeah, I am using an ATMEGA64. Both JTAG and ISP connections. Again, the JTAG ICE mkII works like a champ. The LEDZ JTAG ICE will not connect in debug mode but works in avr program mode (Both JTAG and ISP).