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

I am trying to program an SX28.  I am using the SXTech board.  There are no components plugged into it, and no external oscillator.
 

I have an 8.5V benchtop power supply powering it.

 

When I plug my SX Key RevF onto the board, the board begins pulling 400mA and The SXKey starts burning up.

 

When I connect a Serial cable, I get the message "SXKey not found on COM1"

 

Could my SX28 chip be bad?  The voltage levels are correct at VDD and VSS .

 

Wierd....

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