SIIG's DP Quartet Serial 550 PCI is an excellent solution designed to add four additional 9 pin RS232 serial ports for connecting multiple serial based devices to your PCI enabled desktop computerSiig Inc. Jj-p04621-s7 Dual Profile Quartet 4-port Multiport Serial Adapter - 4 X 9-pin Db-9 Rs-232-serial - 230 Kbps available on February 08 2017 from TechForLess for 61.97
