Dell OptiPlex GX240 User Manual

Page 54

Advanced Features

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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.