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

William,
  I think one problem is that the SX-Key draws alot of current when it first "wakes-up".
  Try putting a cap very close to the Vss and Vdd pins where the key plugs in.
  I have a 10uF cap relatively close and a 0.01uF cap as close as possible to the pins on my video overlay board and I never have a problem, although I do sometimes with the SX-
Tech board.

Bean.

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