Dell OptiPlex GX100 User Guide - Page 92
Keyboard NumLock, PCI IRQ Assignment, Primary Drive, and Secondary Drive
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IDE Drive Interface enables or disables the system's integrated enhanced integrated drive electronics (EIDE) hard-disk drive interface. With Auto (the default) selected, the system turns off the integrated EIDE interface when 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 system enables the integrated EIDE interface to use IRQ14 and IRQ15. If a primary controller is detected on the expansion bus, the integrated EIDE interface is disabled. Selecting Off disables the integrated EIDE interface. Diskette Interface Diskette Interface controls the operation of the system's integrated diskette drive controller. With Auto (the default) selected, the system turns off the integrated diskette drive controller when necessary to accommodate a controller card installed in an expansion slot. With Read Only selected, nothing can be written to any diskette drives and tape drives using the system's integrated diskette/tape drive controller. (The system can still read from the drives.) When Read Only is selected, Auto (whereby the system turns off the integrated diskette drive controller as necessary) is also in effect. Selecting Off turns off the integrated diskette/tape drive controller; this setting is used primarily for troubleshooting purposes. USB Emulation USB Emulation determines whether the system basic input/output system (BIOS) controls Universal Serial Bus (USB) keyboards and mice. When On is selected, the system BIOS controls USB keyboards and mice until a USB driver is loaded by the operating system. When Off is selected (the default), the system BIOS does not control USB keyboards and mice, though they function during the boot routine. Set USB Emulation to Off if you are using a PS/2-compatible keyboard and mouse. PC Speaker PC Speaker determines whether the integrated speaker is On (the default) or Off. A change to this option takes effect immediately (rebooting the system is not required). Primary Video Controller Primary Video Controller determines which video controller to use when the system boots. When Auto is selected, the system uses a video expansion card, if one is installed, or the onboard video controller if a video expansion card is not installed. When Onboard is selected, the system uses the onboard video controller even if a video expansion card is installed. Video DAC Snoop Video DAC Snoop lets you correct video problems that may occur when you use certain video expansion cards. The default is Off. If you are using a video expansion card and problems such as incorrect colors or blank windows occur, set Video DAC Snoop to On. Keyboard NumLock Keyboard NumLock determines whether your system boots with the Num Lock mode activated on 101- or 102-key keyboards (it does not apply to 84-key keyboards). When Num Lock mode is activated, the rightmost bank of keys on your keyboard provides the mathematical and numeric functions shown at the tops of the keys. When Num Lock mode is turned off, these keys provide cursor-control functions according to the label on the bottom of each key. PCI IRQ Assignment PCI IRQ Assignment specifies which IRQ lines are assigned to the Peripheral Component Interconnect (PCI) devices installed in the computer. Press to configure these devices. Then select the device whose IRQ line you want to change, and press the plus (+) or minus (-) key to scroll through the available IRQ lines. Normally you do not need to change the IRQ lines assigned to PCI devices unless a particular device, device driver, or operating system requires a specific IRQ line already in use by a PCI device. Primary Drive n and Secondary Drive n Primary Drive n identifies drives attached to the primary EIDE interface connector (labeled "IDE1") on the system board; Secondary Drive n identifies drives connected to the secondary EIDE interface connector (labeled "IDE2"). Use the secondary EIDE interface connector for EIDE CD-ROM and EIDE tape drives.