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.
Not an audio interface. FireWire interface card with two FireWIre 400 ports and MIDI i/o. This can handle 24 channels i/o over FireWire and turns the following Tascam models into computer audio interfaces: DM-24 16/24 input 8-bus digital mixer, SX-1 40-input, 32 x 8 digital mixer/recorder, SX-1LE Plus, SX-1LE, SX-1SE and DS-M7.1 surround monitor controller.