Dell OptiPlex GXi Reference and Installation Guide ( - Page 33

Mouse Mouse enables or disables the system's built-in PS/2compatible mouse port. Disabling the mouse allows an expansion card to use interrupt request (IRQ) 12. Serial Port Serial Port configures the system's built-in serial port. This category can be set to Auto (the default option) to automatically configure the port, to a specific port setting (COM1 through COM4), or to Off to disable the port. If you set the serial port to Auto and add an expansion card containing a port configured to a specific designation, the system automatically maps the built-in port to the lowest available COM setting. For example, if the expansion-card port is configured to COM1, the system sets the built-in port to COM2; if the expansion-card port is set to COM2, COM3, or COM4, the built-in port is set to COM1. For more information about the built-in port, port designations, and the mapping of ports, see "Connecting External Devices" in your online System User's Guide. Parallel Port Parallel Port configures the system's built-in parallel port. This category can be set to 378h (the default option), to alternate addresses 278h or 3BCh, or to Off to disable the port. NOTE: Do not set Parallel Port to 3BCh if you have an Extended Capabilities Port (ECP) device connected to the port. Parallel Mode Parallel Mode controls whether the system's built-in parallel port acts as an AT-compatible (unidirectional) or PS/2-compatible (bidirectional) port. Your system also supports ECP mode, which can be used by the Windows 95 operating system. Windows 95 uses ECP protocol automatically if it detects an ECP-capable device, removing the necessity for an ECP option in this category. Set this category 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. Hard Disk Hard Disk enables or disables the system's built-in EIDE hard-disk drive interface. With Auto (the default option) selected, the system turns off the built-in EIDE interface as necessary to accommodate a controller card installed in an expansion slot. As part of the boot routine, the system first checks for a primary hard-disk drive controller card installed in an expansion slot. If no card is found, the built-in EIDE interface is enabled, using IRQ14 and IRQ15. If a primary controller is detected on the expansion bus, the built-in EIDE interface is disabled. Selecting Off disables the built-in EIDE interface. Diskette Diskette controls the operation of the system's built-in diskette/tape drive controller. With Auto (the default option) selected, the system turns off the built-in diskette/tape drive controller as necessary to accommodate a controller card installed in an expansion slot. With Write-Protect selected, nothing can be written to diskette drives and tape drives using the system's built-in diskette/tape drive controller. (The system can still read from the drives.) When this option is selected, the Auto option is also in effect (the system turns off the built-in diskette/tape drive controller as necessary). Selecting Off turns off the built-in diskette/tape drive controller; this option is used primarily for troubleshooting purposes. USB USB determines whether the Universal Serial Bus (USB) connectors on the system board are turned On or Off (the default option). Speaker Speaker determines whether the built-in speaker is On (the default option) or Off. Using the System Setup Program 2-9