Dell OptiPlex GX150 User Manual

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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.

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: enables or disables the system's integrated enhanced integrated drive electronics (EIDE) hard 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 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: 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 drive using the system's integrated diskette
drive controller. (The system can still read from the drives.) When Read Only is selected, Auto is also in effect,
meaning that the system turns off the integrated diskette drive controller as necessary.

Selecting Off turns off the integrated diskette drive controller; this setting is used primarily for troubleshooting
purposes.

USB Emulation: determines whether the system'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.

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: 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 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 top of each key. When Num Lock mode is turned off, these keys provide cursor-control functions shown by the
label on the bottom of each key.

Memory Information indicates the amount of installed memory detected in your system, the system memory speed, the amount of video
memory, and the size of the display cache. After you add memory, check this option to confirm that the new memory is installed correctly and
is recognized by the system.

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 drives.

The following settings identify the type of EIDE devices installed in the computer:

Auto (use this setting for all EIDE devices from Dell)

Off

User 1 or User 2

NOTE: You cannot set the parallel port to 3BCh if Mode is set to EPP.

NOTES: For all devices obtained from Dell that use the integrated EIDE controller, set the appropriate Drive option to Auto.

You must have an EIDE device connected to the primary EIDE interface if you have an EIDE device connected to the secondary EIDE
interface.