In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

In my experience the most common cause of frying an SX is either the supply went above 5.5 volts or the outputs were shorted.
Also don't plug-in or remove the SX-Key without removing power. I fryed an SX-key that way. I plugged it in with the power on, and after a couple minutes it was burning hot. Hasn't worked since.
Bean.

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