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

The SX-Key requires 5 volts to program the SX chips.
You can use the SXKeyRing device to program chips that are lower than 5 volts.
The SXKeyring uses a seperate supply to power the SX-Key.

http://www.parallax.com/detail.asp?product_id=45211

Bean.

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