The JTAG MKIIs are not indestructible. I have 6 JTAG MKIIs. Two of them have failed, one was at least 3-4 years old. The second was 2 months old. Over the years I have also had 8-10 flat flex cables fail and a pod fail. The most recently purchased came with an extra flat flex cable.
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你应该买AVR Dragon。它具有 ISP、JTAG、DebugWire 和 HV 编程功能，完全由 USB 供电，成本约为 60 美元。
http://www.atmel.com/dyn/products/tools_card.asp ?tool_id=3891
You should get the AVR Dragon. It has ISP, JTAG, DebugWire and HV programming capabilities, fully powered by USB, and costs around $60.
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3891
JTAG MKII 并非坚不可摧。我有 6 个 JTAG MKII。其中两人失败了，其中一位至少有3-4岁。第二个2个月大了。多年来，我还遇到过 8-10 根扁平柔性电缆和一个吊舱发生故障的情况。最近购买的产品附带一根额外的扁平柔性电缆。
我买了一个中国仿制品，但从来没有用过。
我有一条龙，我没用过。
我想购买 1-2 个 http://www.dhgate.com/usb-avr-jtag-ice-mk-ii-metal-box-anodised/r-ff8080812cf9abc5012cfaf3e60f6e35.html 我喜欢金属外壳，事实上它使用带状电缆而不是扁平柔性电缆，但我很害羞，因为另一个山寨品是 DOA。
我一直购买真实的设备，并多次建议客户也这样做。
The JTAG MKIIs are not indestructible. I have 6 JTAG MKIIs. Two of them have failed, one was at least 3-4 years old. The second was 2 months old. Over the years I have also had 8-10 flat flex cables fail and a pod fail. The most recently purchased came with an extra flat flex cable.
I purchased a Chinese knockoff, it never worked.
I have a Dragon I don't use.
I would like to buy 1-2 of http://www.dhgate.com/usb-avr-jtag-ice-mk-ii-metal-box-anodised/r-ff8080812cf9abc5012cfaf3e60f6e35.html I like the metal enclosure and the fact that it uses a ribbon cable instead of the flat flex cable, but I am gun shy since the other knockoff was DOA.
I keep purchasing the real unit and have recommended on several occasions that clients do the same.
这可能适合您的需求，并且只需 40 欧元。或者，您可以按照此处中的一些说明构建自己的。
This might suit your needs and costs only 40 Euros. Or you could build your own with some instructions from here.