1-Lane (x1) PCI-Express with transfer rate 2.5Gb/s full duplex channel 2-Serial port with transfer rate up to 1.0Mbyte/s 1-Parallel port with transfer rate up to 1.5Mbyte/s Compliant with PCI-Express Revision 1.0a Compatible with Standard 16C550 UART with 16-Byte Transmit-Receive FIFO Support Plug and Play SPP, PS2, EPP, ECP Compatible IEEE 1284 Printer Port Built-in 16 Byte FIFO Connectors: 2 x 9-pin external Serial Ports - DB9 male,1 x 25-pin external Parallel Ports - DB25 female Supports Windows 95, 98, ME, 2000, NT 4.0, XP, Vista, Linux and DOS operating system