Dell OptiPlex GX300 User Guide - Page 75

l Serial Port 1 and Serial Port 2 l Parallel Port l IDE Drive Interface l Diskette Interface l USB Emulation l PC Speaker l Video DAC Snoop Press to configure these options as explained in the following subsections. Sound Sound determines whether the integrated audio controller is On or Off. The default is On. Network Interface Controller Network Interface Controller determines whether the integrated NIC is On, Off, or On w/ MBA. The default is On. If you select On w/ MBA, you are prompted to press at the Dell logo screen during system boot. A menu then appears that allows you to select PXE, RPL, BootP, or NetWare as the active boot mode. Mouse Port Mouse Port enables or disables the system's integrated Personal System/2 (PS/2)-compatible mouse port. Disabling the mouse allows an expansion card to use interrupt request (IRQ)12. Serial Port 1 and Serial Port 2 Serial Port 1 and Serial Port 2 configure the system's integrated serial ports. You can set these options to Auto (the default) to automatically configure a port, to a particular designation (COM1 or COM3 for Serial Port 1; COM2 or COM4 for Serial Port 2), or to Off to disable the port. If you set a serial port to Auto and add an expansion card containing a port configured to the same designation, the system automatically remaps the integrated port to the next available port designation that shares the same IRQ setting as follows: l COM1 (input/output [I/O] address 3F8h), which shares IRQ4 with COM3, is remapped to COM3 (I/O address 3E8h). l COM2 (I/O address 2F8h), which shares IRQ3 with COM4, is remapped to COM4 (I/O address 2E8h). NOTE: When two COM ports share an IRQ setting, you can use either port as necessary, but you may not be able to use them both at the same time. If you are using the Microsoft® Windows® 95 or IBM® OS/2® operating system, you cannot use both serial ports at the same time. If the second port (COM3 or COM4) is also in use, the integrated port is turned off. Parallel Port Parallel Port configures the system's integrated parallel port. Press to configure the Parallel Port options explained in the following subsections. Mode You can set this option to PS/2, EPP, ECP, AT, or Off to disable the port. Set this option according to the type of peripheral device connected to the parallel port. To determine the correct mode to use, see the documentation that came with the device. I/O Address This option determines the I/O address used by the parallel port and appears except when Mode is set to Off. You can set I/O Address to 378h (the default), 278h, or 3BCh. NOTE: Do not set Parallel Port to 278h if you have an Enhanced Capabilities Port (ECP) device connected to the port. DMA Channel This option determines the direct memory access (DMA) channel used by the parallel port and appears only when Mode is set to ECP. The available options are DMA 1, DMA 3, and Off. IDE Drive Interface