This is the detail page for one of over 225 audio interfaces covered in The Computer Audio Interface Guide, which also lists where to buy this interface used.
8 analog, ADAT and S/PDIF I/O, ADAT sync, word clock I/O, headphone out, adds the following to the original 828: 96k, SMPTE+MIDI i/o, better meters, more simultaneous i/o (20in/22out?). AudioDesk software (Digital Performer w/o MIDI).