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

Hey Gunther.

  Thanks for the reply.  Unfortunately, I do not have an oscilloscope available.  From my testing, it seems as if the oscillator on the SX-Key is non functional.  If i set a short program to use the internal oscillator, program the sx and remove the sx-key, it will function fine.  If i set it to use an external oscillator, program the sx, insert an external oscillator and remove the sx-key, it functions fine as well.  However, if i set it to use an external oscillator, leave the sx-key attached and tell it to "Run", the program will not run (well, the LEDs won't blink..)

I'll call Parallax this afternoon for RMA information.  Thanks, all, for the troubleshooting tips and information.  

-Tim

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