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

One issue I have with my USB SX-Key is that is seems to be alot more sensitive to the capacitance on the OSCx lines than the Serial version was.

With the serial version I could plug an SX28 dip into a breadboard and run wires to a 4 pin header to connect the SX-Key. But that doesn't work with the USB version. I think it will program, but it won't debug. 

If I bend the OSCx leads out so they don't go into the breadboard and plug the Key directly into them (and add wire for GND into the Key). Then it works fine.

Bean.

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