Dell OptiPlex GX240 User's Guide - Page 58

www.dell.com | support.dell.com DMA Channel: This option determines the direct memory access (DMA) channel used by the parallel connector and appears only when Mode is set to ECP. The available options are DMA 1, DMA 3, and Off. - IDE Drive Interface: enables or disables the computer's integrated device electronics (IDE) hard drive interface. With Auto (the default) selected, the computer turns off the IDE interface when necessary to accommodate a controller card installed in an expansion slot. As part of the boot routine, the computer first checks for a primary hard drive controller card installed in an expansion slot. If no card is found, the computer enables the IDE interface to use IRQ14 and IRQ15. If a primary controller is detected on the expansion bus, the IDE interface is disabled. Selecting Off disables the IDE interface. - Diskette Interface: controls the operation of the computer's integrated floppy drive controller. With Auto (the default) selected, the computer turns off the integrated floppy drive controller when necessary to accommodate a controller card installed in an expansion slot. With Read Only selected, nothing can be written to any floppy drive using the computer's integrated floppy drive controller. (The computer can still read from the drives.) When Read Only is selected, Auto is also in effect, meaning that the computer turns off the integrated floppy drive controller as necessary. Selecting Off turns off the integrated floppy drive controller; this setting is used to control the use of this legacy device or for troubleshooting purposes. - USB Emulation: determines whether the computer's basic input/output system (BIOS) controls Universal Serial Bus (USB) keyboards and mice. When On is selected (the default), the BIOS controls USB keyboards and mice until a USB driver is loaded by the operating system. When Off is selected, the BIOS does not control USB keyboards and mice, although they function during the boot routine. Set USB Emulation to Off if you are using a PS/2-compatible keyboard and mouse. NOTE: For Windows NT®, Off is the default setting. 56 Advanced Features