16 Port USB to Serial RS232 Adapter Hub

4 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART

4 Port RS232 PCI Express Serial Card w/ Breakout Cable

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)