This half size card provides 4 industry standard 9 pin RS232 serial COM ports using just a single PCI slot. The fourth port is a flying lead header which can be either connected to an available slot or knock out on the chassis. As PCI is fully Plug & Play compatible the operating system or Bios automatically configures the card ensuring conflict free installation. Serial Solutions Device Driver CD contains software for Windows 7, Server 2008, Vista, Server 2003, XP, 2000, Millennium, 98, 95, NT4, Windows 3.x, DOS and OS/2. Informative manuals and sample programs are supplied with full source code on CD!