ATL OEM-I HX User manual

63
OEM-I HX
Motherboard
Product Guide

Index
Arvida Technology Ltd. (ATL) makes no warranty of any kind with regard to this material, including, but not limited to, the
implied warranties of merchantability and fitness for a particular purpose. ATL assumes no responsibility for any errors that
may appear in this document. ATL makes no commitment to update nor to keep current the information contained in this
document. No part of this document may be copied or reproduced in any form or by any means without prior written consent
of ATL.
†Third-party brands and trademarks are the property of their respective owners.
Copyright 1996, ATL Corporation.

Product Description
Figure 1. Motherboard Components
A. Flash memory device M. SRAM sites
B. 1 MB PLCC flash N. Primary power connector
C. Clock battery O. Configuration jumper block
D. Recovery jumper P. Floppy connector
E. COM1 serial port Q. Front panel connector
F. Parallel port connector R. BGA 82430HX
G. PS/2†keyboard connector S. IDE connectors
H. PS/2 mouse connector T. SIMM†sockets
I. COM2 serial port U. PCI add-in connectors
J. Voltage regulator V. PIIX3
K. I/O controller W. ISA add-in connectors
L. Pentiumprocessor
socket

Index
Feature Summary
• Intel Pentium microprocessor running at 75, 90, 100, 120, 133, 150, and 166 MHz
• ATX form factor motherboard
• Intel 82430HX PCIset
• PC87306B Ultra I/O controller (integrates serial ports, parallel port, floppy disk interface, real time
clock, CMOS RAM, keyboard controller, and support for an IrDA†-compatible infrared interface)
• Support for up to 128 MB of DRAM installed in single in-line memory modules (SIMMs)
• AMIBIOS in a flash memory device that supports system setup and PCI auto-configuration
• Expansion slots for up to six add-in boards
 Three dedicated PCI-bus slots
 Two dedicated ISA-bus slots
 One "combination" slot for either a PCI or an ISA add-in board
• Two RS-232C-compatible 9-pin serial connectors
• One multimode, 25-pin Centronics†-compatible parallel port
• PS/2-style keyboard and mouse connectors
• Password protection for system security
Central Processing Unit
The system is designed to operate with the Intel Pentium microprocessor. The Pentium processor, in
addition to its expanded data and addressing capabilities, includes the following features:
• Ready for next generation OverDriveprocessor
• Backward compatibility with Intel microprocessor architecture
• Onchip numeric coprocessor (compatible with the Intel486DX processor and compliant with
ANSI/IEEE standard
754-1985)
• Onchip 16 KB cache (8 KB for data, 8 KB for code)
• Burst-mode bus cycles
Chapter 3 tells how to upgrade the CPU.
Memory
The motherboard supports base (conventional) and extended memory. Operating systems such as
MS-DOS†, OS/2†, UNIX†, and all application programs use base memory. For better performance,
OS/2 and UNIX as well as many
MS-DOS applications use extended memory. For the system memory map, see Chapter 5.
The motherboard supports up to 128 MB of DRAM. DRAM is implemented through 72-pin single in-
line memory modules (SIMMs). The motherboard contains four SIMM sockets. Chapter 3 describes
how much memory and which type of SIMM you can install to get the total amount of DRAM you want.

Cache Memory
The Pentium microprocessor includes 16 KB of cache on the chip. The 82430HX PCIset includes a
cache controller that supports direct-mapped cache memory and supports a second level cache that
uses up to 512 KB of Synchronous Pipeline Burst SRAM.
IDE Peripheral Interface
The motherboard provides a high speed, 32-bit PCI/IDE interface. The PCI/IDE interface supports:
• Up to four PCI/IDE hard drives on the PCI bus
• PIO Mode 3 and Mode 4 support
• Logical block addressing (LBA) of hard drives larger than 528 MB
• Extended Cylinder Head Sector (ECHS) translation modes
• ATAPI devices (such as CD-ROMs) on both IDE interfaces
System I/O
The I/O controller (PC87306B) integrates the functions for the serial ports, parallel port, diskette
drives, and keyboard. This component provides:
• Multimode bi-directional parallel port
 Standard mode: Centronics-compatible operation
 High-speed mode: support for enhanced capabilities port (ECP) and enhanced parallel port
(EPP)
• Two RS-232C 116550A-compatible 9-pin serial ports
• Integrated real time clock with an accuracy of ±13 minutes/year
• A 242-byte battery-backed CMOS RAM
• Integrated 8042 compatible keyboard controller
• Flexible IRQ and DMA mapping to support Windows†95
• Support for an IrDA-compatible infrared interface. The infrared interface supports data transfer
rates of up to 115 Kbaud with either half- or full-duplex operation. In full-duplex mode, both the
transmitter and receiver are enabled simultaneously for higher throughput.
• Industry standard diskette drive controller that supports 720 KB, 1.44 MB, and 2.88 MB 3.5-inch
drives (at 135 tracks per inch); and 360 KB and 1.2 MB 5.25-inch drives
System BIOS
The system BIOS, from American Megatrends Incorporated (AMI), provides ISA and PCI compatibility.
The BIOS is contained in a flash memory device. The BIOS provides the power-on self test (POST),
the system Setup program, a PCI and IDE auto-configuration utility, and BIOS recovery code.
The system BIOS is always shadowed. Shadowing allows any BIOS routines to be executed from fast
32-bit onboard DRAM instead of from the slower 8-bit flash device.
PCI Auto-configuration
The PCI auto-configuration utility works in conjunction with the Setup program to support using PCI
add-in boards in the system. When you turn on the system power after installing a PCI board, the
BIOS automatically configures interrupts, DMA channels, I/O space, and so on. Since PCI add-in

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boards use the same interrupt resources as ISA add-in boards, you must specify the interrupts used
by ISA boards in the Setup program. Chapter 2 tells how to use the Setup program. The PCI auto-
configuration program complies with version 2.1 of the PCI BIOS specification.
IDE Auto-configuration
If you install an IDE drive in the system, the IDE auto-configuration utility automatically detects and
configures the drive for operation in the system. This utility eliminates the need to enter the Setup
program after you install an IDE drive.
ISA Plug and Play Capability
This provides auto-configuration of Plug and Play ISA cards and resource management for legacy
(non Plug and Play) ISA cards when used with the ISA Configuration Utility (ICU) or a Plug and Play
compatible operating system like Windows 95.
BIOS Upgrades
Because the BIOS is stored in a flash memory device, you can easily upgrade the BIOS without
having to disassemble the system. The flash upgrade process can be done by running a utility from a
diskette or hard disk, or over a network.
For information about the latest BIOS update, contact your service representative.
Expansion Slots
The board has two dedicated 16-bit ISA/AT†-compatible and three dedicated PCI-compatible
expansion slots. One expansion slot is a "combination" slot and can be used by either a PCI or an
ISA board, enabling you to install a maximum of six add-in boards.
System Security
The BIOS provides a password option that you can enable through the Setup program (see
Chapter 2).
Keyboard/Mouse Controller
The I/O controller stores the keyboard and mouse controller code. The board uses
PS/2-style connectors for the keyboard and mouse.
Real-Time Clock and CMOS RAM
The I/O controller provides a real-time clock and CMOS RAM. Chapter 3 provides information about
replacing the battery.
You can set the time for the clock and the CMOS values by using the system BIOS Setup program,
described in Chapter 2.

Fan Connector
The board contains a connector for a CPU fan. Refer to Chapter 5 for the locations and pinout of the
fan connector.
Speaker
The board has a connector for an offboard speaker. Chapter 5 shows the location and pinout for the
speaker connector.

Index
Using The Setup Program
This chapter tells how to use the Setup program that is built into the BIOS. The Setup program makes
it possible to change configuration information (such as the types of peripherals that are installed) and
the boot-up sequence for the system. The Setup information is stored in CMOS random access
memory (RAM) and is backed up by a battery when power is off.
If the board does not operate as described here, see Chapter 4 for problem descriptions and error
messages.
If you want to go into the Setup program, reboot the board and press <F1> as soon as you see the
message “Press <F1> Key if you want to run SETUP.” You have about five seconds to press <F1> to
enter Setup before the boot process continues.
Record the Setup Configuration
To make sure you have a reference to the Setup values for your system, we recommend you write
down the current settings and keep this record up-to-date.
Setup Menu Overview
The Setup program initially displays the Main menu screen. In each screen there are options for
modifying the system configuration. Select a menu screen by pressing the left <←> or
right <→> arrow keys. Use the up <↑> or down <↓> arrow keys to select items in a screen. Use the
<Enter> key to select an item for modification. For certain items, pressing <Enter> brings up a
subscreen. After you have selected an item, use the arrow keys to modify the setting.
Setup Menu Overview
Setup Menu
Screen Description
Main For setting up and modifying basic
options, such as time, date, diskette
drives, and hard drives.
Advanced For modifying the more advanced
features, such as peripheral
configuration and advanced chipset
configuration.
Security For specifying passwords that can be
used to limit access to the system.
Exit For saving or discarding changes.
Floppy Options For configuring diskette drives.
Primary/
Secondary IDE
Master/Slave
Configuration
For configuring IDE hard drives.
Boot Options For modifying options that affect the
system boot up, such as the boot
sequence.
Peripheral
Configuration For modifying options that affect the serial ports, the parallel port, and the

disk drive interfaces.
Advanced
Chipset
Configuration
For modifying options that affect
memory and system busses.
Plug and Play
Configuration For modifying options that affect the system’s Plug and Play capabilities.
Overview of the Setup Keys
The following keys have special functions in the BIOS Setup program.
Overview of the Setup Keys
Setup Key Description
<F1> Pressing the <F1> key brings up a help
screen for the current item.
<Esc> Pressing the <Esc> key takes you back
to the previous screen. Pressing
<Esc> in the Main, Advanced, Security,
or Exit screen allows you to Exit
Discarding Changes (see later in this
chapter).
<Enter> Pressing the <Enter> key selects the
current item or option.
<↑>Pressing the up arrow <↑> key
changes the selection to the previous
item or option.
<↓>Pressing the down arrow <↓> key
changes the selection to the next item
or option.
<←> <→>Pressing the left <←> or right arrow
<→> keys in the Main, Advanced,
Security, or Exit menu screens
changes the menu screen. Pressing
either key in a subscreen does nothing.
<F5> Pressing the <F5> key allows you to
Load Setup Defaults (see later in this
chapter).
<F6> Pressing the <F6> key allows you to
Discard Changes (see later in this
chapter).
<F10> Pressing the <F10> key allows you to
Exit Saving Changes (see later in this
chapter).
Main BIOS Setup Screen
This section describes the Setup options found on the main menu screen. If you select certain
options from the main screen (e.g., Primary IDE Master), the Setup program switches to a subscreen
for the selected option.

Index
System Date
Specifies the current date. Select the month from a pop-up menu.
System Time
Specifies the current time.
Floppy Options
When selected, this pops up the Floppy Options subscreen.
Primary IDE Master
Reports if an IDE device is connected to the Primary IDE Master interface. When selected, this brings
up the Primary IDE Master Configuration subscreen.
Primary IDE Slave
Reports if an IDE device is connected to the Primary IDE Slave interface. When selected, this brings
up the Primary IDE Slave Configuration subscreen.
Secondary IDE Master
Reports if an IDE device is connected to the Secondary IDE Master interface. When selected, this
brings up the Secondary IDE Master Configuration subscreen.
Secondary IDE Slave
Reports if an IDE device is connected to the Secondary IDE Slave interface. When selected, this
brings up the Secondary IDE Slave Configuration subscreen.
Language
Specifies the language of the text strings used in the Setup program and the BIOS. The options are
any installed languages.
Boot Options
When selected, this brings up the Boot Options subscreen.
Video Mode
Reports the video mode. There are no options.
Mouse
Reports if a mouse is installed or not. There are no options.
Base Memory
Reports the amount of base memory. There are no options.

Extended Memory
Reports the amount of extended memory. There are no options.
Floppy Options Subscreen
Floppy A:
Reports if a diskette drive is connected to the system. There are no options.
Floppy B:
Reports if a second diskette drive is connected to the system. There are no options.
Floppy A: Type
Specifies the physical size and capacity of the diskette drive. The options are Disabled,
360 KB, 5.25-inch; 1.2 MB, 5.25-inch; 720 KB,
3.5-inch; 1.44/1.25 MB, 3.5-inch; 2.88 MB,
3.5-inch. The default is 1.44/1.25 MB, 3.5-inch.
Floppy B: Type
Specifies the physical size and capacity of the diskette drive. The options are Disabled,
360 KB, 5.25-inch; 1.2 MB, 5.25-inch; 720 KB,
3.5-inch; 1.44/1.25 MB, 3.5-inch; 2.88 MB,
3.5-inch. The default is Disabled.
Primary/Secondary IDE Master/Slave Configuration
Subscreens
There are four subscreens used to enable IDE devices: Primary IDE Master, Primary IDE Slave,
Secondary IDE Master, and Secondary IDE Slave. All four subscreens contain the same eight fields
described below.
IDE Device Configuration
Used to manually configure the hard drive or have the system auto configure it. The options are Auto
Configured, User Definable, and Disabled. The default is Auto Configured. If you select User
Definable, the Number of Cylinders, Number of Heads, and Number of Sectors items can be modified.
If you select Disabled, the BIOS will not scan for a drive on that interface.
Number of Cylinders
If Hard Disk Type is set to User Definable, you must type the correct number of cylinders for your hard
disk. If Hard Disk Type is set to Auto Configured, this reports the number of cylinders for your hard
disk and cannot be modified.
Number of Heads
If Hard Disk Type is set to User Definable, you must type the correct number of heads for your hard
disk. If Hard Disk Type is set to Auto Configured, this reports the number of heads for your hard disk
and cannot be modified.

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Number of Sectors
If Hard Disk Type is set to User Definable, you must type the correct number of sectors for your hard
disk. If Hard Disk Type is set to Auto Configured, this reports the number of sectors for your hard disk
and cannot be modified.
Maximum Capacity
Reports the maximum capacity of your hard disk. It is calculated from the number of cylinders, heads,
and sectors. There are no options here.
IDE Translation Mode
Specifies the IDE translation mode. The options are Standard CHS (standard cylinder head sector —
less than 1024 cylinders), Logical Block, Extended CHS (extended cylinder head sector — greater
than 1024 cylinders), and Auto Detected (BIOS detects IDE drive support for LBA). The default is
Auto Detected.
CAUTION
Do not change this from the option selected when the hard drive was formatted. Changing the
option can result in corrupted data.
Multiple Sector Setting
Sets the number of sectors transferred by an IDE drive per interrupt generated. The options are
Disabled, 4 Sectors/Block, 8 Sectors/Block, or Auto Detected. The default is Auto Detected. Check
the specifications for your hard disk drive to determine which setting provides optimum performance
for your drive.
Fast Programmed I/O Modes
Sets how fast transfers on the IDE interface occur. The options are Disabled or Auto Detected. The
default is Auto Detected. If set to Disabled, transfers occur at a less than optimized speed. If set to
Auto Detected, transfers occur at the drive’s maximum speed.
Boot Options Subscreen
This section describes the options available on the Boot Options subscreen.
First Boot Device
Sets which drive the system checks first to find an operating system to boot from. The options are
Disabled, Floppy, Hard Disk, CD-ROM, and Network. The default is Floppy.
Second Boot Device
Sets which drive the system checks second to find an operating system to boot from. The options are
Disabled, Floppy, Hard Disk, and Network. The default is Hard Disk.

Third Boot Device
Sets which drive the system checks third to find an operating system to boot from. The options are
Disabled, Floppy, Hard Disk, and Network. The default is CD-ROM.
Fourth Boot Device
Sets which drive the system checks fourth to find an operating system to boot from. The options are
Disabled, Floppy, Hard Disk, and Network. The default is Disabled.
System Cache
Enables or disables both the primary and the secondary cache memory. The options are Enabled or
Disabled. The default is Enabled.
Boot Speed
Sets the system’s boot speed. The options are Deturbo and Turbo. The default is Turbo. If Turbo is
selected, boot-up occurs at full speed. If Deturbo is selected, the board operates at a slower speed.
Num Lock
Sets the beginning state of the Num Lock feature on your keyboard. The options are On and Off.
The default is Off.
Setup Prompt
Turns on (or off) the “Press <F1> Key if you want to run Setup” prompt during the power-up sequence.
The options are Enabled and Disabled. The default is Enabled.
/NOTE
This option has no effect on your ability to access the Setup program. It only toggles the prompt.
Typematic Rate Programming
Sets the typematic rates. The options are Default and Override. The default is Default. Choosing
Override enables Typematic Rate Delay and Typematic Rate.
Typematic Rate Delay
Sets how long it takes for the key-repeat function to start when you hold down a key on the keyboard.
The options are 250, 500, 750, and 1000 millisecond delays. The default is 250. If Typematic Rate
Programming is set to Default, this option will not be visible.
Typematic Rate
Sets the speed at which characters repeat when you hold down a key on the keyboard. The higher
the number, the faster the characters repeat. The options are 6, 8, 10, 12, 15, 20, 24, and 30
characters per second. The default is 6. If Typematic Rate Programming is set to Default, this option
will not be visible.
Advanced Screen
This section describes the Setup options found on the Advanced menu screen. If you select certain
options from the Advanced screen (e.g., Peripheral Configuration), the Setup program switches to a

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subscreen for the selected option. Subscreens are described in the sections following the description
of the Advanced screen options.
Processor Type
Reports the CPU type. There are no options.
Processor Speed
Reports the CPU clock speed. There are no options.
Cache Size
Reports the size of the secondary cache. There are no options.
Peripheral Configuration
When selected, this brings up the Peripheral Configuration subscreen.
Advanced Chipset Configuration
When selected, this brings up the Advanced Chipset Configuration subscreen.
Plug and Play Configuration
When selected, this brings up the Plug and Play Configuration subscreen.
Peripheral Configuration Subscreen
This section describes the screens for the peripheral configuration subscreen.
Configuration Mode
Enables you to choose between setting the peripheral configuration yourself, or having the system do
it. The options are Auto and Manual. The default is Auto.
When Auto is selected, the system peripherals are automatically configured during power up. The
options below for PCI IDE Interface, Floppy Interface, Serial Port 1 and Serial Port 2 Addresses, Serial
Port 2 IR Mode, and the Parallel Port Address cannot be modified. The settings displayed for those
options reflect the current state of the hardware.
PCI IDE Interface
Enables or disables the PCI IDE hard disk interface. The options are Enabled and Disabled. The
default is Enabled. (If Configuration Mode is set to Auto, this option cannot be modified.)
Floppy Interface
Enables or disables the diskette drive interface. The options are Enabled and Disabled. The default
is Enabled. (If Configuration Mode is set to Auto, this option cannot be modified.)

Serial Port 1 Address
Selects the address and IRQ of serial port 1. The options are Disabled; COM1, 3F8h, IRQ4; COM3,
3E8h, IRQ4; and COM4, 2E8h, IRQ3. The default is COM1, 3F8h, IRQ4. If the Configuration Mode is
set to Auto, the Setup program assigns the first free COM port (normally COM1, 3F8h, IRQ4) as the
serial port 1 address and IRQ, regardless of what is selected under the Serial Port 1 Address option.
(If Configuration Mode is set to Auto, this option cannot be modified.)
Serial Port 2 Address
Selects the address and IRQ of serial port 2. The options are Disabled; COM2, 2F8h, IRQ3; COM3,
3E8h, IRQ4; and COM4, 2E8h, IRQ3. The default is COM2, 2F8h, IRQ3. If the Configuration Mode is
set to Auto, the Setup program assigns the first free COM port (normally COM2, 2F8h, IRQ3) as the
serial port 2 address and IRQ, regardless of what is selected under the Serial Port 2 Address option.
(If Configuration Mode is set to Auto, this option cannot be modified.)
/NOTE
If either serial port address is set, the address it is set to will not appear in the options dialog box
of the other serial port. If an ATI†mach32†or an ATI mach64†video controller is active, the
COM4, 2E8h, IRQ3 address will not appear in the options dialog box of either serial port.
Serial Port 2 IR Mode
Makes Serial Port 2 available to infrared applications. The options are Enabled and Disabled. The
default is Disabled. (If Configuration Mode is set to Auto, this option cannot be modified.)
Parallel Port Address
Selects the address and IRQ of the parallel port. The options are Disabled; LPT3, 3BCh, IRQ7;
LPT1, 378h, IRQ7; LPT1, 378h, IRQ5; and LPT2, 278h, IRQ5. The default is LPT1, 378h, IRQ7. If
the Configuration Mode is set to Auto, the setup program assigns LPT1, 378h, IRQ7 as the parallel
port address, regardless of what is selected under the Parallel Port Address option. (If Configuration
Mode is set to Auto, this option cannot be modified.)
Parallel Port Mode
Selects the mode for the parallel port. The options are Compatible, Bi-directional, EPP, and ECP.
The default is Compatible. Compatible means the parallel port operates in AT-compatible mode. Bi-
directional means the parallel port operates in bi-directional PS/2-compatible mode. EPP and ECP
mean the parallel port operates high-speed, bi-directionally. This option is not affected by the
Configuration Mode field above.
Advanced Chipset Configuration Subscreen
This section describes the options available on the Advanced Chipset Configuration Subscreen.
Base Memory Size
Sets the size of the base memory. The options are 512 KB and 640 KB. The default is 640 KB.

Index
ISA LFB Size
Sets the size of the linear frame buffer. The options are Disabled, 1 MB, 2 MB, and 4 MB. The
default is Disabled. If this is set to anything other than Disabled, the ISA LFB Base Address field will
appear.
ISA LFB Base Address
Reports the base address of the LFB. There are no options. This field will not appear if the ISA LFB
Size is set to Disabled.
Video Palette Snoop
Controls the ability of a primary PCI graphics controller to share a common palette with an ISA add-in
video card. The options are Enabled and Disabled. The default is Disabled.
Latency Timer (PCI Clocks)
Sets the length of time an agent on the PCI bus can hold the bus when another agent has requested
the bus. Valid numbers are between 0 and 256. The default is 66.
ECC Support
Reports the presence or absence of ECC support. If parity SIMMs are installed on the system board,
the field reports Detected and ECC is enabled. If non-parity SIMMs are installed, the fields reports Not
Detected and ECC is not enabled. This field is information only; there are no options.
Plug and Play Configuration Subscreen
This section describes the options found on the Plug and Play configuration subscreen.
Configuration Mode
Sets how the BIOS gets information about ISA cards that do not have Plug and Play capabilities. The
options are Use Setup Utility and Use ICU (ISA Configuration Utility). The default is Use Setup Utility.
If Use ICU is selected, the BIOS will depend on run-time software to ensure that there are no conflicts
between ISA boards with Plug and Play capabilities and those without. Only Boot With PnP OS will
be visible.
Boot with PnP OS
Enables the PC to boot with an operating system capable of managing Plug and Play add-in cards.
The options are None, Other, and Windows 95. The default is Windows 95.
ISA Shared Memory Size
Enables you to specify a range of memory addresses that will be directed to the ISA bus rather than
on-board memory. The options are Disabled, 16 KB, 32 KB, 48 KB, 64 KB, 80 KB, and 96 KB. The
default is Disabled. If this is set to Disabled, the ISA Shared Memory Base Address (described below)
will not be visible.

This field should be set to Enabled only when a non Plug and Play ISA card (legacy card) that
requires non-ROM memory space is used. LAN cards that have on-board memory buffers are one
example of this; video capture cards that have video buffer memory are another.
By default, allocation of upper memory is as follows: memory from C0000-C7FFF is automatically
shadowed. (This memory range is typically reserved for video BIOS.) Memory from C8000-DFFFFh is
initially unshadowed. The BIOS scans this range for any ISA expansion card BIOSes that may be
present and notes their location and size. The BIOS will then autoconfigure the PCI and Plug and
Play devices, shadowing the ROM requirements (other than video) into the area above E0000h until
that area is full. It will then assign additional PCI and Plug and Play expansion cards to the area
between C8000h and DFFFFh. If an ISA legacy card has non-ROM memory requirements, the
autoconfigure routine may write into an area that is needed by the ISA expansion card. The ISA
Shared Memory Size parameter signifies the autoconfigure routine that this block of memory is
reserved and should not be shadowed.
Shadowing is a technique that copies a block of memory from an add-in card’s ROM to the same
address in system DRAM memory. This provides faster access and achieves higher performance.
ISA Shared Memory Base Address
Sets the base address for the ISA Shared Memory. The options are C8000h, CC000h, D0000h,
D4000h, D8000h, and DC000h. The default is C8000h. This setting could affect the ISA Shared
Memory Size item. The value entered in the ISA Shared Memory Size item cannot extend to the
E0000h address. For example, if a size of 64K was selected, options D4000h, D8000h, and DC000h
will not be available.
IRQ 5, 9, 10, 11
Sets the status of the IRQ. The options are Available and Used By ISA Card. The default is
Available. The PCI auto-configuration code looks here to see if these interrupts are available for use
by a PCI add-in board. If an interrupt is available, the PCI auto-configuration code can assign the
interrupt to be used by the system. If your system contains an ISA add-in card that uses one of these
interrupts, select Used By ISA Card for that interrupt.
/NOTE
IRQs 5, 9, 10, and 11 are the default user available IRQs. Depending on your configuration, this
screen might show more interrupts than those listed here. If you have disabled the parallel port
or either of the serial ports, or have not installed a PS/2 mouse, more IRQs will be available.
See Chapter 5 for information on reserved and available IRQs.
Security Screen
This section describes the two access modes that can be set using the options found on the Security
screen, and then describes the Security screen options themselves.
Administrative and User Access Modes
The options on the Security screen menu make it possible to restrict access to the Setup program by
enabling you to set passwords for two different access modes: Administrative mode and User mode.
In general, Administrative mode has full access to the Setup options, whereas User mode has
restricted access to the options. Thus, by setting separate Administrative and User passwords, a
system administrator can limit who can change critical Setup values. The actual limitations depend on

Index
whether either the Administrative or User passwords or both are set. (See the table below for a
description of how the passwords actually work together.)
To limit access to who can boot the system, set the User password. This is the password that the
system asks for before booting. If only the Administrative password is set, the system boots up
without asking for a password. If both passwords are set, you can enter either password to boot the
system.
The following table shows the effects of setting the Administrative and User passwords. (The table is
for reference only, and is not shown on the Security screen.) In the table, the statement “Can change
a limited number of options” means you can change the system date and time, the User password, the
security hot key, and unattended start.
Administrative and User Password Functions
Password
Set Administrative mode can . . . User mode can . . .
Password
Required
During
Boot
Neither Can change all
options* Can change all options* None
Administrativ
e only Can change all options Can change a limited
number of
options
None
User only N/A Can change
all options User
Both Can change all
options Can change a limited
number of
options
Administr
ative or
User
*If no password is set, any user can change all Setup options.
Security Screen Options
User Password is
Reports if there is a User password set. There are no options.
Administrative Password is
Reports if there is an Administrative password set. There are no options.
Set User Password
Sets the User password. The password can be up to seven alphanumeric characters.
Set Administrative Password
Sets the Administrative password. The password can be up to seven alphanumeric characters.

Unattended Start
Controls when the security password is requested. The options are Enabled and Disabled. The
default is Disabled. The User password must be enabled before you can enable this option. If
Enabled is selected, the system boots, but the keyboard will be locked until the User password is
entered.
Security Hot Key (CTRL-ALT-)
Sets a hot key that, when pressed, locks the keyboard until the User password is entered. The
Keyboard LEDs flash to indicate that the keyboard is locked. When you enter the User password, you
do not have to press the <Enter> key.
Exit Screen
This section describes the different ways to exit and save or not save changes made in the Setup
program.
Exit Saving Changes
Saves the changes to CMOS RAM and exits the Setup program. You can also press the <F10> key
anywhere in the Setup program to do this.
Exit Discarding Changes
Exits the Setup program without saving any changes. This means that any changes made while in the
Setup program are discarded and NOT SAVED. Pressing the <Esc> key in any of the four main
screens will do this.
Load Setup Defaults
Resets all of the setup options to their defaults. You can also press the <F5> key anywhere in the
Setup program to do this.
This selection loads the default Setup values from the ROM table.
Discard Changes
Discards any changes you made during the current Setup session without exiting the program. You
can also press the <F6> key anywhere in the Setup program to do this.
This selection loads the CMOS RAM values that were present when the system was turned on.

Index
Installing & Configuring
Motherboard Options
This chapter describes the following:
• Jumper block locations and functions
• Procedures to remove and install optional components
• Information about replacing the battery
Before You Begin
• Be sure to do each procedure in the correct order.
• Set up an equipment log to record the system model and serial numbers, all installed options, and
other information about the system. If you need this information, it will be easier to consult the log
than to open up and examine the system.
• You will need a medium flat-bladed screwdriver and a jumper removal tool, such as a pair of fine
needle-nosed pliers. We recommend that you use an antistatic wrist strap and a conductive foam
pad when working on the board.
WARNING
The procedures in this chapter assume familiarity with the general terminology associated
with personal computers and with the safety practices and regulatory compliance required
for using and modifying electronic equipment.
Disconnect the system from its power source and from any telecommunications links,
networks or modems before doing any of the procedures described in this chapter.
Failure to disconnect power, telecommunications links, networks or modems before you
open the system or do any procedures can result in personal injury or equipment damage.
Some circuitry on the system board may continue to operate even though the front panel
power button is off.
CAUTION
Electrostatic discharge (ESD) can damage components. Do the procedures described in this
chapter only at an ESD workstation. If such a station is not available, you can provide some
ESD protection by wearing an antistatic wrist strap and attaching it to a metal part of the system
chassis.
Add-in boards can be extremely sensitive to ESD and always require careful handling. After
removing the board from its protective wrapper or from the system, place the board flat on a
grounded, static-free surface, component-side up. Use a conductive foam pad if available, but
not the board wrapper. Do not slide the board over any surface.
Jumper Block Overview
The motherboard contains configuration jumpers that make it possible to change the system
configuration. For instance, you can prevent access to the system Setup program by moving a
jumper. If you forget your system password, you can clear the password by moving a jumper. The