Hercules 16/12 fw Driver support ...
https://discussions.apple.com/thread/2237803?start=0&tstart=0
is archived unfortunately, though it doesn't seem to be the most recent status.
It seems http://ts.hercules.com/ger/index.php?pg=view_files&gid=2&fid=30&pid=161&cid=1 does supply a Snow Leopard capable driver, though Hercules TS declared to not write one. All ab it too late, no doubt ... but maybe it helps and is correcting the negative messages appearing in search machines concerning the Hercules 16/12 fw.
Mac OS X (10.6.8)