What portable DATs use a coaxial cable rather than optical, any other than the DA-P1?
Almost all DAT decks use coaxial. With the Sony decks, you'd have to use a special short 7-pin cable. but coax > 7-pin are the most common of these. a D8 is propably you're best bet.
alternatively, if you want to buy a new deck, consider the Marantz PMD-670. that'll take a coax digi in, record to Flash cards, and you could buy a couple of 2 gig flash cards and be set for 3 hours (same as DAT).