2x Serial Ports ExpressCard with MCS9901 chipset. Complies with PCI-Express Specification Rev 1.0a with data transfer rate up to 2.5Gbps. Complies to Expresscard/34 standard running on PCI-e interface. Supports Plug & Play and Hot Plug feature. Supports Windows 2000, XP 32/64-bit, Server 2003 32/64-bit, Vista 32/64-bit, Server 2008 32/64-bit, Linux, Mac OS. Serial Port (RS232) Interface. PCI-e based true serial port. Compatible with industrial standard 16C450/16C550 UART. On chip 256-byte FIFO in transmit and receive path of each port. Data transfer rate up to 250Kbps on each (Special Version can support up to 1Mbps). Support hardware and software flow control. Supports 5-, 6-,7-,8-bit serial format. Support even, odd, none, space and mark parity. Supports 1 or 2 Stop bit operation