I have as well the dc30+ card with zr36057PQC chips and so on.
If there is an alternative, péease send me a mail.
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I don't understand your question ?
If you want to record with the DC30+ in Linux. You have to
get the cvs zoran driver, and the mjpegtools.
For both things you should find the answers in the
mjpeg-users maling list archive.
If you have other questions please ask on the mjpeg-users