Syba Io Card Sd-Pex15011 4Port Serial Rs-232 Pciex1 Card Build-In 16C550 Compatible Uart 250Kbps Syba Io Card Sd-Pex15011 4Port Serial Rs-232 Pciex1 Card Build-In 16C550 Compatible Uart 250Kbps Build-in 16C550 compatible UARTs; 256-Byte deep transmitting and receiving FIFO. Transfer rate up to 250Kbps; Support RS-232 hardware, software flow control. Driver support for windows 2000, Server 2003, XP 32/64, Vista 32/64, Win 7 32/64. 4x serial ports PCI-Express card, user manual, driver CD, and 44pin to 4x serial ports cable.