StarTech.com 4 Port PCI Express RS232 Serial Adapter Card with 16950 UART (PEX4S950) Backward compatible with 16C450, 16C550, 16C650 and 16C750 UARTs Data transfer rates of up to 115 Kbps for peak serial device performance Easy to install and use with full step-by-step instructions Package includes both the full and low profile brackets for use with slim and micro POS systems UARTs fully compatible with 16C550 type devices high performance 16C950 UART channel Fully Compliant with PCI Express Base Specifications, Revision 1.0a