Lindy 51175 interface cards/adapter

USB -> Serial Converter - 8 Port, Internal The convenient, space-saving way to connect your serial devices to an internal USB port!
This clever converter board can be mounted into two spare PC case back plate slots to allow you to connect up to 8 external serial RS-232 devices to an internal USB port on a motherboard or expansion card. A space-saving alternative to USB converter cables, it's supplied with all required connection cables and back plates for use in standard and low profile PC cases.