4 Port USB to RS232 Serial Adapter Hub

2 Port Low Profile Native RS232 PCI Express Serial Card with 16550 UART – PCIe RS232 – PCI-E Serial Card

4-Port PCI Express RS232 Serial Adapter Card – 16950 UART – 256-byte FIFO Cache – ASIX AX99100 – Full Profile Bracket – Replacement for PEX4S952 (PEX4S953)

8-Port PCI Express Serial Card – 16550 UART RS232 – PCIE Low Profile Bracket – DB9 Serial Card (PEX8S1050LP)