2 Port DisplayPort Dual-Monitor KVM – 4K

1 ft USB to RS232 Serial DB9 Adapter Cable with COM Retention – USB to DB9 – USB to Serial Port Adapter

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

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