JEmplode will talk to a Mk1 over serial on some systems, but this hasn't been tested much. It does not speak USB. It will not speak USB any time in the near future, as there are no decent USB classes available for Java. Basically, it's mostly good for Ethernet. :)
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Daniel M. Zimmerman Mk.2 #060000058, 36GB Mk.1 #00101, 10GB