Your idea to use both ports on a network interface card (NIC) inside a
computer will probably NOT work. I haven't seen a NIC yet that allows
more than one port active (you get either 10Base2 or 10BaseT, but not
both at the same time).
What you want is called a converter. I know of two companies that supply
these, and there are undoubtedly more. I have no experience with converters,
but I plan on purchasing some soon.
Black Box <http://www.blackbox.com>
Media Converter 10BASE-T/BNC LE612A
Cabletron Systems <http://www.ctron.com>
Coax-to-Twisted Pair Transceiver CTP100-T
/\/\/\_ Eric Van Buren, vanburen%flovax.dnet@rocdec.roc.wayne.edu
\ \ \ Immunology & Microbiology
\_^_/ Wayne State University, Detroit, Michigan