In SX Microcontrollers, SX/B Compiler and SX-Key Tool, timsmith54321 wrote:

Is the power supply for the PDB and the breadboard different?  Are you sure you have a stable 3VDC going into the board?  Do you have spare capacitors you could place over the main +/- and then another 0.1uF across P2 and P4.  I don't know too much about these things, but you've tried everything else.  I don't know what capacitor to use for the main, maybe 100uF electrolytic.  Did you try putting a digital multimeter on the power into the SX Key?  The uploading of the programs seems to be less sensitive to voltage fluctuations than the debugging.   What if you tap into the power on the PDB and bring it over to your breadboard?

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