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StarTech.com 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART (PEX2S553)The PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), and r..