4-12 System BoardSerial InterfaceThe system has one 16C550 UART compatible serial port (COM1) integratedon the I/O controller. The serial port supports the standard RS-232C interface.The buffered high-speed serial port supports transfer rates up to 115.2 KB. Theport allows the installation of high-speed serial devices for faster data transferrates.The I/O addresses for the channel is given in the following table (see Section 2,“System Configuration,” for interrupt levels). Soft-selectable base addresses are3F8h, 2F8h, 3E8h, and 2E8h.Serial Port I/O AddressesStarting I/O Address Port3F8 COM12F8 COM23E8 COM32E8 COM4See Section 2, “System Configuration,” for information on resetting the portthrough the BIOS Setup utility. See Section 9, “Specifications,” for the serialinterface specifications.Serial interface signals are output through the system board’s 9-pin,D-subconnector. The connector is located at the back of the system unit.USB InterfaceThe Universal Serial Bus (USB) ports allow new Plug and Play serial devices tobe added without having to open the system. One USB device may be pluggedinto each USB port for direct system connection. With a hub and the propercabling, up to 127 USB devices can be addressed by the system. The USBdetermines system resources for each peripheral and assigns them without userintervention. Boot support for a USB keyboard is present so the system can bebooted with a USB keyboard instead of a standard keyboard.Accelerated Graphics PortThe system board contains a direct integrated accelerated graphics port (DirectAGP) that supports graphics-intensive, 3D applications. The Direct AGPoperates independently of the PCI bus and supports 133-MHz data transfer rates,allowing 500 MB of data to be transmitted per second.Attach an optional display monitor to the system board’s VGA-compatibleconnector on the rear panel.
