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

[quote="Rsadeika"]If you do a search of this forum, you will probably find some threads that cover the medal. I think about a year and a half ago there were some threads covering this. If I recall, you needed a keyring to be able to program the thing, Parallax no longer sells the device, so you may be out luck in that area.[/quote]

I think the new USB SX-Key is powered from the USB so that the SX-Keyring is no longer needed.  I believe the Keyring was only needed for the original SX-Key (Serial based) so that it could be powered directly without having to take 5V power from the target system.  That way it could program devices that ran on 3.3v instead.

I just received a new USB SX-Key and will do some tests to see how it works when programming SX chips running at both 3.3V and 5V.

Robert

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