"The card features four RS-422 "miniDin8" serial ports. Each port supports data rates up to 1 Mbps. Unlike previous models, the SX PRO provides support for selected MIDI peripherals. Plus, one port on the SX PRO can be made to emulate a Macintosh printer port. This enables the card to be used with a wide range of serial printers from Apple, Epson, Hewlett Packard, and other leading printer manufacturers."
Keyspan has not released pricing information yet but the company says the product should be shipping by late March.