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

John,
  Alot depends on how much current you require.

  A PC USB port does provide +5V, but be warned I recently damaged one of the USB ports in my computer because had the +5V pin shorted to ground.

  The +12V on the serial port probably will not have enough current for your needs (only a couple milliamps).

  The PC power supply may have the opposite problem, too much current. If something gets shorted it could burn the wires and/or damage the PC.

  Andre' runs his XGS Pico kit from a common 9Volt battery. To get longer run time, you might want to use 6 AA batteries. That would be this simplest method.

Bean.

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