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Added mar05:
for newcomers to this thread the only one we can find at mar05 is the gefen bi-directional HD-SDI to DVI convertor

http://www.gefen.com/kvm/product.jsp?prod_id=2566
$2000

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this company claimed to have a device that converts the dvi output to sdi.

http://chaldee1.gotadsl.co.uk/~richa...ghlight=dvi2tv
but this company never delivered.