Hi forwardbias,
I don't use XP or the epic, but I have heard of lots of port issues with XP.
As I understand it XP doesn't permit programs direct access to I/O.
here are a couple of links of things to try:
http://www.compphix.com/xpprintprob.html
http://www.direct-io.com/
http://www.analog.com/UploadedFiles/...nsorReadME.pdf
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