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Office Depot
2-Port PCI Serial Card - U.S. Converters LLC
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Amazon.com: StarTech.com 4-Port PCI Serial Card with 16550 UART - PCI RS232 Serial Adapter Card (PCI4S550N) : Electronics
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StarTech.com 16 Port PCI Express Serial Card - High-Speed PCIe (PEX16S550LP)
Serial Card PCI Low Profile, 1 port RS-232
