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Advanced/ML
Motherboard
Technical Product Specification
Order Number 281806-002
May 1996
Revision History
Revision
Revision History
Date
-001
Preliminary release of the Advanced/ML Technical Product Specification.
2/96
-002
Second release of the Advanced/ML Technical Product Specification.
5/96
This product specification applies only to standard Advanced/ML ATX motherboards with BIOS
identifier 1.00.01.DB0.
Changes to this specification will be published in the Advanced/ML Motherboard Specification
Update before being incorporated into a revision of this document.
Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or
otherwise, to any intellectual property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of
Sale for such products, Intel assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to
sale and/or use of Intel products including liability or warranties relating to fitness for a particular purpose, merchantability, or
infringement of any patent, copyright or other intellectual property right. Intel products are not intended for use in medical, life
saving, or life sustaining applications.
Intel retains the right to make changes to specifications and product descriptions at any time, without notice.
The Advanced/ML motherboard may contain design defects or errors known as errata. Current characterized errata are
available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order.
† Third-party brands and names are the property of their respective owners.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be
obtained from:
Intel Corporation
P.O. Box 7641
Mt. Prospect, IL 60056-7641
or call in North America 1-800-879-4683, Europe 44-0-1793-431-155, France 44-0-1793-421-777,
Germany 44-0-1793-421-333, Japan (fax only) 81-0-120-478-832, other Countries 708-296-9333
Copyright  1996, Intel Corporation
Table of Contents
1 Motherboard Description
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
Overview ............................................................................................................7
Motherboard Manufacturing Options..................................................................8
Form Factor .......................................................................................................9
Microprocessor...................................................................................................9
1.4.1
Microprocessor Upgrade ......................................................................9
Memory ............................................................................................................10
1.5.1
Second-level Cache............................................................................10
1.5.2
Main System Memory .........................................................................10
Chipset .............................................................................................................11
1.6.1
82439HX Xcelerated Controller (TXC)................................................11
1.6.2
82371SB PCI ISA/IDE Xcelerator (PIIX3) ...........................................11
1.6.3
IDE SUPPORT....................................................................................12
I/O Controller....................................................................................................12
1.7.1
Floppy Controller ................................................................................12
1.7.2
Keyboard and Mouse Interface...........................................................13
1.7.3
Real-time Clock, CMOS RAM and Battery .........................................13
1.7.4
IrDA (Infra-red) Support ......................................................................14
1.7.5
Parallel Port ........................................................................................14
Motherboard Connectors .................................................................................15
1.8.1
Power Supply Connectors ..................................................................15
1.8.2
PCI IDE Header Connectors...............................................................16
1.8.3
Diskette Drive Header Connector .......................................................17
1.8.4
Front panel Connectors ......................................................................18
1.8.5
Back Panel Connectors ......................................................................21
Add-in Board Expansion Connectors ...............................................................23
Jumper Settings ...............................................................................................25
1.10.1 Configuration Jumper Settings ...........................................................26
1.10.2 CPU Configuration (J7K1-B, C, D)......................................................26
1.10.3 Clear CMOS (J7K1-A, Pins 4,5,6) ......................................................27
1.10.4 Password Clear (J7K1-A, Pins 1,2,3) .................................................27
1.10.5 CMOS Setup Access (J7K1-B, Pins 1,2,3) .........................................27
iii
ATX Motherboard Technical Product Specification
1.11
1.12
1.13
1.14
1.10.6 VR/OVD (J7K1-B, Pins 4,5,6) .............................................................27
1.10.7 Program Boot Block Enable (J1F1, Pins 4,5,6) ..................................27
1.10.8 Recovery Boot Enable (J1F1, Pins 1,2,3)...........................................27
Reliability..........................................................................................................28
Environmental ..................................................................................................28
Power Consumption.........................................................................................28
Regulatory Compliance....................................................................................29
1.14.1 Safety..................................................................................................29
1.14.2 EMI .....................................................................................................29
1.14.3 Product Certification Markings............................................................30
1.14.4 Use Only for Intended Applications.....................................................30
2 Motherboard Resources
2.1 Soft-off Control .................................................................................................32
3 Motherboard BIOS and Setup Utilities
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
iv
Introduction ......................................................................................................35
BIOS Flash Memory Organization ...................................................................35
BIOS Upgrades ................................................................................................35
PCI IDE Support...............................................................................................36
PCI Auto-configuration .....................................................................................36
ISA Plug and Play ............................................................................................37
Advanced Power Management ........................................................................37
Language Support............................................................................................37
Boot Options ....................................................................................................38
Flash LOGO Area ............................................................................................38
Setup Enable Jumper.......................................................................................38
BIOS Setup Utility.............................................................................................38
3.12.1 Overview of the Setup Menu Screens ................................................38
3.12.2 Main BIOS Setup Screen....................................................................39
3.12.3 Floppy Options Subscreen .................................................................40
3.12.4 Hard Disk Configuration Subscreen....................................................41
3.12.5 Boot Options Subscreen.....................................................................42
3.12.6 Advanced Screen ...............................................................................43
3.12.7 Peripheral Configuration Subscreen...................................................44
3.12.8 Advanced Chipset Configuration Subscreen ......................................45
Contents
3.12.9
3.12.10
3.12.11
3.12.12
3.12.13
Power Management Configuration Subscreen ...................................46
Plug and Play Configuration Subscreen .............................................46
Security Screen ..................................................................................47
Security Screen Options .....................................................................48
Exit Screen .........................................................................................49
4 Error Messages and Beep Codes
4.1
4.2
4.3
4.4
BIOS Beep Codes............................................................................................51
PCI Configuration Error Messages ..................................................................51
BIOS Error Messages ......................................................................................52
ISA NMI Messages ..........................................................................................53
v
1 Motherboard Description
1.1 Overview
The ATX motherboard integrates the Pentium microprocessor, memory, and I/O technologies into
a standard ATX form factor.
The motherboard design supports Pentium processors operating at 75, 90, 100, 120, 133, 150,
and 166 MHz. The other motherboard features include:
•
•
•
•
•
•
Supports up to 128 MB of EDO DRAM or standard Fast Page DRAM in standard 72-pin
SIMM† sockets, either parity, non-parity, or ECC.
Type 7 Pentium OverDrive socket provides an upgrade to future OverDrive processors.
Intel's 82430HX PCIset.
PC87306B Super I/O controller.
Bus mastering IDE.
Supports Plug and Play and Advanced Power Management (APM).
7
ATX Motherboard Technical Product Specification
A
B
C D
E
F
G H
I
J
K
L
M
N
W
V
U
T
S
R
Q P O
OM04289A
Figure 1. Motherboard Features
A.
Flash memory device
B.
MB PLCC flash
C. Clock battery
M. SRAM sites
N. Primary power connector
O. Configuration jumper block
D. Recovery jumper
P.
E.
COM1 serial port
Q. Front panel connector
Floppy 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.
K.
I/O controller
W. ISA add-in connectors
L.
Pentium processor socket
PIIX3
1.2 Motherboard Manufacturing Options
•
•
8
256 or 512 KB pipeline burst SRAM cache
Support for Universal Serial Bus (USB)
Motherboard Description
1.3 Form Factor
The motherboard is designed to fit into a standard ATX form factor chassis. Figure 2 illustrates the
mechanical form factor for the motherboard. The ATX form factor does not adhere to the standard
ATX guidelines in that the outer dimensions are 12" x 7". Location of the I/O connectors, riser
slot, and mounting holes are in strict compliance with the ATX specification.
6.500
6.100
5.200
0.0
0.500
0.650
11.350
0.0
?.?
4.900
11.100
OM04290
Figure 2. Motherboard Dimensions
1.4 Microprocessor
The motherboard is designed to operate with 3.3 volt Pentium Processors. An onboard linear
voltage regulator circuit provides the required 3.3 volts from the 5.0 volt tap of the power supply.
An on-board jumper enables use of VRE specified processors. Pentium processors that run
internally at 75, 90, 100, 120, 133, 150 and 166 MHz are supported.
The Pentium processor maintains full backward compatibility with the 8086, 80286, i386 and
Intel486 processors. It supports both read and write burst mode bus cycles, and includes separate
8 KB on-chip code and data caches that employ a write-back policy. The Pentium processor is an
advanced numeric coprocessor that significantly increases the speed of floating point operations,
while maintaining backward compatibility with i486DX math coprocessor and complying to
ANSI/IEEE standard 754-1985.
1.4.1
Microprocessor Upgrade
The motherboard provides a 321-pin Socket 7 ZIF processor socket. Socket 7 supports a processor
upgrade path that includes higher performance Pentium OverDrive processors than can be
supported with socket 5.
9
ATX Motherboard Technical Product Specification
1.5 Memory
1.5.1
Second-level Cache
The Intel 82430HX Xcelerated Controller PCIset supports a second level cache that uses the
Synchronous Pipeline Burst SRAM. Pipeline Burst (PB) SRAM provides performance similar to
Synchronous Burst SRAMs for only a slight cost premium over slower performing Asynchronous
SRAMs.
Data SRAM speed is 15 ns that supports up to 66 MHz processor (external) bus speed.
1.5.2
Main System Memory
The motherboard provides four 72-pin SIMM sockets that make it possible to install up to 128 MB
of RAM. The sockets support 1M x 32 (4 MB), 2M x 32 (8 MB), 4M x 32 (16 MB), and 8M x 32
(32 MB) single- or double-sided modules. Minimum memory size is 8 MB and maximum
memory size, using four 8M x 32 SIMM modules, is 128 MB. Memory timing requires 70 ns fast
page devices or, for optimum performance, 60 ns EDO DRAM. If the maximum external CPU
clock speed is 60 MHz or slower, 70 ns EDO DRAM may be used. Either parity or non-parity
memory SIMMs are supported. ECC SIMMs are also supported.
The four sockets are arranged in two banks of two sockets each. The sockets are designated Bank
0 and Bank 1. Each bank provides a 64/72-bit wide data path. Both SIMMs in a bank must be of
the same memory size and type, although the different types of memory may differ between banks.
It is even possible to have 70 ns Fast Page DRAM in one bank and 60 ns EDO DRAM in the other,
in that case each bank is independently optimized for maximum performance. Bank 0 only, Bank
1 only, or both of the banks may be populated. There are no jumper settings required for the
memory size or type, that is automatically detected by the system BIOS. Use only tin lead SIMMs
when adding DRAM.
1.5.2.1
EDO DRAM
Extended Data Out (or Hyper Page) DRAM is designed to improve the DRAM read performance.
EDO DRAM holds the memory data valid until the next memory access cycle, unlike standard fast
page mode DRAM that tri-states the memory data when the precharge cycle occurs, prior to the
next memory access cycle.
10
Motherboard Description
1.6 Chipset
The Intel 82430HX PCIset consists of the 82439HX Xcelerated Controller (TXC) and one
82371SB PCI ISA/IDE Xcelerator (PIIX3) bridge chip.
1.6.1
82439HX Xcelerated Controller (TXC)
The 82439HX provides all control signals necessary to drive a second level cache and the DRAM
array, including multiplexed address signals. The TXC also controls system access to memory and
generates snoop controls to maintain cache coherency. The TXC comes in a 324-pin BGA package
and includes the following features:
•
•
•
1.6.2
CPU interface control
Integrated L2 write-back cache
controller
 Pipeline burst SRAM
 256 or 512 KB direct-mapped
Integrated DRAM controller
 64 bit path to memory
 Support for EDO and fast page
DRAM
 8 MB to 128 MB main memory
 Parity and non-parity support
•
Fully synchronous PCI bus interface
 25/30/33 MHz
 PCI to DRAM > 100 Mbytes/sec
 Up to 4 PCI masters in addition to
the PIIX3 and IDE.
82371SB PCI ISA/IDE Xcelerator (PIIX3)
The PIIX3 provides the interface between the PCI and ISA buses and integrates a dual channel fast
IDE interface capable of supporting up to 4 devices. The PIIX3 integrates seven 32-bit DMA
channels, one 16-bit timer/counters, two eight-channel interrupt controllers, PCI-to-AT interrupt
mapping circuitry, NMI logic, ISA refresh address generation, and PCI/ISA bus arbitration
circuitry together onto the same device. The PIIX3 comes in a 208-pin QFP package and includes
the following features.
•
•
•
Interface between the PCI and ISA
buses
Universal Serial Bus controller
 Host/hub controller
Integrated fast IDE interface
 Support for up to 4 devices
 PIO Mode 4 transfers up to
16 MB/sec
 Integrated 8 x 32-bit buffer for bus
master PCI IDE burst transfers
 Bus master mode
•
•
•
•
•
PCI 2.1 compliant
Enhanced fast DMA controller
Interrupt controller and steering
Counters/timers
SMI interrupt logic and timer with fast
on/off mode
11
ATX Motherboard Technical Product Specification
1.6.3
IDE SUPPORT
The motherboard provides two independent high performance bus-mastering PCI IDE interfaces
capable of supporting PIO Mode 3 and Mode 4 devices. The system BIOS supports Logical
Block Addressing (LBA) and Extended Cylinder Sector Head (ECHS) translation modes as well as
ATAPI (e.g. CD-ROM) devices on both IDE interfaces. Detection of IDE device transfer rate and
translation mode capability is automatically determined by the system BIOS.
Normally, programmed I/O operations require a substantial amount of CPU bandwidth. In true
multi-tasking operating systems like Windows† 95, the CPU bandwidth freed up by using bus
mastering IDE can be used to complete other tasks while disk transfers are occurring. When used
in conjunction with the appropriate driver for the Windows 95 environment, the IDE interface can
operate as a PCI bus master capable of supporting PIO Mode 4 PIO Mode 4 devices with transfer
rates of up to 16 MB/sec.
Detailed information on the PCIset is available in the Intel 82430HX PCISet data sheet
1.7 I/O Controller
Control for the integrated serial ports, parallel port, floppy drive, RTC and keyboard controller is
incorporated into a single component, the National Semiconductor 306B. This component
provides:
•
•
•
•
•
•
Two NS16C550-compatible UARTs with send/receive 16 byte FIFO
Support for an IrDA† compliant Infra Red interface
Multi-mode bi-directional parallel port
 Standard mode; IBM† and Centronics† compatible
 Enhanced Parallel Port (EPP) with BIOS/Driver support
 High Speed mode; Extended Capabilities Port (ECP) compatible
Industry standard floppy controller with 16 byte data FIFO (2.88 MB floppy support)
Integrated Real Time Clock accurate within +/- 13 minutes/yr at 25º C and 5 volts when the
system is continuously powered on
Integrated 8042 compatible keyboard controller
By default, the 306B interfaces are automatically configured by the BIOS during boot-up. You can
also manually configure the interfaces with the BIOS Setup utility. Chapter 3 describes and tells
how to invoke the BIOS Setup utility.
1.7.1
Floppy Controller
The I/O controller is software compatible with the DP8473 and 82077 floppy disk controllers. You
can configure the floppy interface for 360 KB or 1.2 MB 5¼ inch media or for 720 KB, 1.2 MB,
1.44 MB, or 2.88 MB 3½ inch media with the BIOS setup utility. By default, the Floppy A
interface is configured for 1.44 MB and Floppy B is disabled. A Setup option makes it possible to
prevent a user from being able to write to a floppy drive. A driver is required for configuring the
floppy interface for 1.2 MB 3.5-inch (3-mode floppy) operation.
12
Motherboard Description
1.7.2
Keyboard and Mouse Interface
PS/2† keyboard and mouse connectors are located on the back panel side of the motherboard. The
5V lines to these connectors are protected with a PolySwitch† circuit that acts much like a selfhealing fuse, re-establishing the connection after an over-current condition is removed. While this
device eliminates the possibility of having to replace a fuse, you should still be sure to turn off the
system power before installing or removing a keyboard or mouse.
The integrated 8042 microcontroller contains the AMI Megakey keyboard and mouse controller
code that, besides providing traditional keyboard and mouse control functions, supports PowerOn/Reset (POR) password protection. The POR password can be defined by the user via the Setup
program. The keyboard controller also provides for the following "hot key" sequences:
•
•
•
•
•
•
1.7.3
<CTRL><ALT><DEL>: System software reset. This sequence performs a software reset of
the system by jumping to the beginning of the BIOS code and running the POST operation.
<CTRL><ALT><+> and <CTRL><ALT><->: Turbo mode selection.
<CTRL><ALT><-> sets the system for de-turbo mode, emulating an 23 MHz AT.
<CTRL><ALT><+> sets the system for turbo mode. Changing the Turbo mode may be
prohibited by an operating system, or when the CPU is in Protected mode or virtual x86 mode
under DOS.
<CTRL><ALT><defined in setup>: Power down and coffee-break key sequences take
advantage of the SMM capabilities of the Pentium processor to greatly reduce the system’s
power consumption while maintaining the responsiveness necessary to service external
interrupts.
<CTRL><ALT><defined in setup>: Keyboard lock key sequence provides system security by
blanking the screen and ignoring keyboard input until the BIOS User Password is typed.
When the Keyboard lock sequence is invoked, the keyboard LEDs will flash to indicate that
the User Password must be entered to unlock the system. This feature will not take effect
unless the User Password has been set in the BIOS setup.
Real-time Clock, CMOS RAM and Battery
The integrated real-time clock (RTC) is DS1287 and MC146818 compatible and provides a time of
day clock, 100-year calendar with alarm features and is accurate to within 13 minutes per year.
The RTC can be set via the BIOS SETUP program. The RTC also supports 242-byte
battery-backed CMOS RAM in two banks which is reserved for BIOS use. The CMOS RAM can
be set to specific values or cleared to the system default values using the BIOS SETUP program.
Also, the CMOS RAM values can be cleared to the system defaults by using a configuration
jumper on the motherboard.
An external coin-cell style battery provides power to the RTC and CMOS memory. The battery
has an estimated lifetime of three years if the system is not plugged into the wall socket. When the
system is plugged in, power is supplied from the ATX power supply’s 5v standby current to extend
the life of the battery.
13
ATX Motherboard Technical Product Specification
1.7.4
IrDA (Infra-red) Support
A 5-pin header connector is provided to allow connection to a Hewlett Packard HSDSL-1000
compatible Infra-red (IrDA) transmitter/receiver. Once the module is connected to the header,
Serial port 2 can be re-directed to the IrDA module. Once configured for IrDA, the user can
transfer files to or from portable devices such as laptops, PDA’s and printers using application
software such as LapLink†. The IrDA specification provides for data transfers at 115 Kbps from a
distance of 1 meter.
1.7.5
Parallel Port
The Parallel port can be configured in the BIOS setup as output only compatible mode,
bi-directional mode, ECP or EPP modes. The highly flexible parallel port can also be assigned to
I/O addresses 278H, 378H, or 3BCH and IRQ’s 5 or 7. Furthermore, a routable DMA scheme
allows Plug and Play operating systems such as Windows 95 to route either DMA channels 1 or 3
to the parallel port for ECP mode. EPP BIOS support must be provided by a device driver or TSR.
14
Motherboard Description
1.8 Motherboard Connectors
There are connectors on-board for Floppy, IDE, SIMMs, battery holder and front panel I/O
connectors. Pinouts for the motherboard connectors follow Figure 3.
P CI
Connectors (4)
11
1
20
10
Primary
Secondary
ISA
Connectors (3)
2
1
20
40
PCI IDE Connector(2)
P owe r
Connector
39
2
34
1
5
33
Floppy Drive Connect or
29
1
Front Panel I/O Connector Header
OM04291
Figure 3. Motherboard Connector Locations
1.8.1
Power Supply Connectors
When used with a power supply that supports remote power on/off, the motherboard can turn off
the system power via software control (“soft-off” is a manufacturing option). The Powerman
utility supplied for Windows 3.1x allows for soft-off as does the shutdown icon in Windows 95
Start menu. The system BIOS will turn the system power off when it receives the proper APM
command from the OS. For example, Windows 95 will issue this APM command when the user
selects “Shutdown the computer” option. APM must be enabled in the system BIOS and OS in
order for the soft-off feature to work correctly. In order for the system to recognize the presence of
a “soft-off” power supply, the supply must tie pin 14 of the PWS Control connector to ground. If
power to the system is interrupted due to a power outage or the power cord being unplugged, when
power is reapplied, the system will return to the state it was in when the power was disconnected.
If the system was turned on when power was disconnected, the system will turn back on when
power is reapplied.
15
ATX Motherboard Technical Product Specification
Primary Power Connector (J6M1)
Pin
Name
Function
1
3.3V
3.3V
2
3.3V
3.3V
3
GND
Ground
4
+5 V
+ 5 volts Vcc
5
GND
Ground
6
+5 V
+ 5 volts Vcc
7
GND
Ground
8
PWRGD
Power Good
9
5VSB
standby 5v
10
+12 V
+ 12 volts
11
3.3V
3.3V
12
-12 V
- 12 volts
13
GND
Ground
14
PS_ON*
soft-off control
15
GND
Ground
16
GND
Ground
17
GND
Ground
18
-5 V
- 5 volts
19
+5 V
+ 5 volts Vcc
20
+5 V
+ 5 volts Vcc
1.8.2
PCI IDE Header Connectors
IDE Connector Pinout
Pin
Signal Name
Pin
Signal Name
1
Reset IDE
2
Ground
3
Host Data 7
4
Host Data 8
5
Host Data 6
6
Host Data 9
7
Host Data 5
8
Host Data 10
9
Host Data 4
10
Host Data 11
11
Host Data 3
12
Host Data 12
13
Host Data 2
14
Host Data 13
15
Host Data 1
16
Host Data 14
17
Host Data 0
18
Host Data 15
19
Ground
20
Key
21
DRQ3
22
Ground
continued ☛
16
Motherboard Description
IDE Connector Pinout (continued)
Pin
Signal Name
Pin
Signal Name
23
I/O Write-
24
Ground
25
I/O Read-
26
Ground
27
IOCHRDY
28
BALE
29
DACK3-
30
Ground
31
IRQ14
32
IOCS16-
33
Addr 1
34
Ground
35
Addr 0
32
Addr 2
37
Chip Select 0-
38
Chip Select 1-
39
Activity
40
Ground
1.8.3
Diskette Drive Header Connector
Diskette Drive Connector Pinout
Pin
Signal Name
Pin
Signal Name
1
Ground
2
FDHDIN
3
Ground
4
Reserved
5
Key
6
FDEDIN
7
Ground
8
Index-
9
Ground
10
Motor Enable A-
11
Ground
12
Drive Select B-
13
Ground
14
Drive Select A-
15
Ground
16
Motor Enable B-
17
Ground
18
DIR-
19
Ground
20
STEP-
21
Ground
22
Write Data-
23
Ground
24
Write Gate-
25
Ground
26
Track 00-
27
Ground
28
Write Protect-
29
Ground
30
Read Data-
31
Ground
32
Side 1 Select-
33
Ground
34
Diskette Change-
17
ATX Motherboard Technical Product Specification
1.8.4
Front panel Connectors
The motherboard provides header connectors to support functions typically located on the chassis
bezel. Front panel features supported include:
•
•
•
•
•
•
•
System Reset
Power LED
Hard Drive activity LED
System Speaker
CPU fan
Infra-red (IrDA) port
Sleep/Resume
25
20
18
15 14
11
9
7
5
4
3
29
1
SPKR
IR
S LE EP P WR
HD LED
P W R LE D
RST
FAN
OM0 4 5 2 0
Figure 4. Front Panel I/O Connectors
1.8.4.1
Speaker
The external speaker provides error beep code information during the Power-on Self Test, if the
system cannot use the video interface.
Speaker Connector Pinout
18
Pin
Signal Name
26
SPKR_DAT
27
SPKR_DAT
28
Key
29
Ground
Motherboard Description
1.8.4.2
Infra-red (IrDA) connector
Serial port 2 can be configured to support an IrDA module via a 5 pin header connector. Once
configured for IrDA, the user can transfer files to or from portable devices such as laptops, PDA’s
and printers using application software such as LapLink. The IrDA specification provides for data
transfers at 115 Kbps from a distance of 1 meter.
Infrared Connector Pinout
Pin
Signal Name
20
+5 V
21
no connect
22
IRRX
23
Ground
24
IRTX
25
no connect
1.8.4.3
Sleep / Resume
When Advanced Power Management (APM) is activated in the system BIOS and the Operating
System’s APM driver is loaded, Sleep mode (Stand-by) can be entered in one of three ways: an
optional front panel “Sleep/Resume” button, a user defined keyboard hot key, or prolonged system
inactivity. The Sleep/Resume button is supported by a 2-pin header located on the front panel I/O
connector. Closing the “Sleep” switch will generate an SMI (System Management Interrupt) to
the processor which immediately goes into System Management Mode (SMM), the so called
“Sleep” mode.
The front panel “Sleep mode” switch must be a momentary two pin SPST type that is normally
open. The function of the Sleep/Resume button can also be achieved via a keyboard hot-key
sequence, or by a time-out of the system inactivity timer. Both the keyboard hot-key and the
inactivity timer are programmable in the BIOS setup (timer is set to 10 minutes by default). To reactivate the system, or “Resume”, the user must simply press the sleep/resume button again, or use
the keyboard or mouse. Mouse activity will only “wake up” the system if a mouse driver is
loaded. While the system is in Stand-by or “sleep” mode it is fully capable of responding to and
servicing external interrupts (such as in-coming FAX) even though the monitor will only turn on if
a user interrupt (keyboard/mouse) occurs as mentioned above.
Sleep/Power Connector Pinout
Pin
Signal Name
15
SW_ON*
16
Ground
17
COMATOSE *
18
+5 V
19
ATX Motherboard Technical Product Specification
1.8.4.4
Hard Drive LED
Hard Drive LED Connector Pinout
Pin
Signal Name
11
+5 V
12
HDA*
13
PWR_LED_DRV
14
+5 V
1.8.4.5
Power LED
Power LED Connector Pinout
Pin
Signal Name
7
+5 V
8
+5 V
9
PWR_LED_DRV
10
PWR_LED_DRV
1.8.4.6
Reset
This 2-pin header can be connected to a momentary SPST type switch that is normally open.
When the switch is closed, the system will hard reset and run POST.
Reset Connector Pinout
Pin
Signal Name
4
Ground
5
SW_RST
1.8.4.7
Fan
CPU Fan Connector Pinout
20
Pin
Signal Name
1
Ground
2
+12 V
3
Ground
Motherboard Description
1.8.5
Back Panel Connectors
The back panel provides external access to PS/2 style keyboard and mouse connectors as well as
two serial and one parallel port, which are integrated on the motherboard. Figure 5 shows the
general location of the I/O connectors.
COM 2
PS/2
Mouse
Parallel Port
COM 1
PS/2
Keyboard
OM04292
Figure 5. I/O Connections
1.8.5.1
COM1 and 2 Serial Ports
Serial Port Connector Pinout
Pin
Signal Name
1
DCD
2
Serial In - (SIN)
3
Serial Out - (SOUT)
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
21
ATX Motherboard Technical Product Specification
1.8.5.2
Keyboard and Mouse Ports
Keyboard and Mouse Connector Pinouts
Pin
Signal Name
1
Data
2
No connect
3
Ground
4
+5 V (fused)
5
Clock
6
No Connect
1.8.5.3
Parallel Port
Parallel Port Connector Pinout
22
Pin
Signal Name
Pin
Signal Name
1
Strobe-
14
Auto Feed--
2
Data Bit 0
15
Fault*
3
Data Bit 1
16
INIT*
4
Data Bit 2
17
SLCT IN*
5
Data Bit 3
18
Ground
6
Data Bit 4
19
Ground
7
Data Bit 5
20
Ground
8
Data Bit 6
21
Ground
9
Data Bit 7
22
Ground
10
ACK*
23
Ground
11
Busy
24
Ground
12
Paper end
25
Ground
13
SLCT
Motherboard Description
1.9 Add-in Board Expansion Connectors
Expansion Slots support up to four PCI and up to three ISA add-in boards. The PCI bus is fully
compliant with the PCI 2.1 specification and supports up to four bus master through the four PCI
connectors.
PCI Slots (J4E1,J4E2,J4C1,J4D1)
Pin
Signal Name
Pin
Signal Name
Pin
Signal Name
Pin
Signal Name
A1
Vcc
B1
-12V
A32
AD16
B32
AD17
A2
+12V
B2
GND
A33
3.3V
B33
CBE2 #
A3
Vcc
B3
GND
A34
FRAME #
B34
GND
A4
Vcc
B4
No Connect
A35
GND
B35
IRDY #
A5
Vcc
B5
Vcc
A32
TRDY #
B32
3.3V
A6
PIRQ1 #
B6
Vcc
A37
GND
B37
DEVSEL #
A7
PIRQ3 #
B7
PIRQ2 #
A38
STOP #
B38
GND
A8
Vcc
B8
PIRQ0 #
A39
3.3V
B39
LOCK #
A9
No Connect
B9
PRSNT1B#
A40
SDONE
B40
PERR #
A10
Vcc
B10
No Connect
A41
SBO #
B41
3.3V
A11
No Connect
B11
PRSNT2B#
A42
GND
B42
SERR #
A12
GND
B12
GND
A43
PAR
B43
3.3V
A13
GND
B13
GND
A44
AD15
B44
CBE1 #
A14
No Connect
B14
No Connect
A45
3.3V
B45
AD14
A15
RST #
B15
GND
A46
AD13
B46
GND
A16
Vcc
B16
PCLK3
A47
AD11
B47
AD12
A17
GNT1 #
B17
GND
A48
GND
B48
AD10
A18
GND
B18
REQ #
A49
AD9
B49
GND
A19
Reserved
B19
Vcc
A50
KEY
B50
KEY
A20
AD30
B20
AD31
A51
KEY
B51
KEY
A21
3.3V
B21
AD29
A52
CBEO #
B52
AD8
A22
AD28
B22
GND
A53
3.3V
B53
AD7
A23
AD26
B23
AD27
A54
AD6
B54
3.3V
A24
GND
B24
AD25
A55
AD4
B55
AD5
A25
AD24
B25
3.3V
A56
GND
B56
AD3
A26
AD25 (IDSEL) B26
CBE3 #
A57
AD2
B57
GND
A27
3.3V
B27
AD23
A58
AD0
B58
AD1
A28
AD22
B28
GND
A59
Vcc
B59
Vcc
A29
AD20
B29
AD21
A60
REQ64 #
B60
ACK64 #
A30
GND
B30
AD19
A61
Vcc
B61
Vcc
A31
AD18
B31
3.3V
A62
Vcc
B62
Vcc
23
ATX Motherboard Technical Product Specification
ISA Slots (J4A1, J4B1, J4B2)
24
Pin
Signal Name
Pin
Signal Name
Pin
Signal Name
Pin
Signal Name
A1
IOCHK-
B1
GND
A26
SA5
B26
DACK2-
A2
SD7
B2
RSTSLOT
A27
SA4
B27
TC
A3
SD6
B3
Vcc
A28
SA3
B28
BALE
A4
SD5
B4
IRQB9
A29
SA2
B29
Vcc
A5
SD4
B5
-5V
A30
SA1
B30
OSC
A6
SD3
B6
DREQ2
A31
SA0
B31
GND
A7
SD2
B7
-12V
C1
SBHE-
D1
MEMCS16-
A8
SD1
B8
ZEROWS-
C2
LA23
D2
IOCS16-
A9
SD0
B9
+12V
C3
LA22
D3
IRQB10
A10
IOCHRDY
B10
GND
C4
LA21
D4
IRQB11
A11
AEN
B11
SMEMW-
C5
LA20
D5
IRQB12
A12
SA19
B12
SMEMR-
C6
LA19
D6
IRQ15
A13
SA18
B13
IOW-
C7
LA18
D7
IRQ14
A14
SA17
B14
IOR-
C8
LA17
D8
DACK0-
A15
SA16
B15
DACK3-
C9
MEMR-
D9
DREQ0
A16
SA15
B16
DREQ3
C10
MEMW-
D10
DACK5-
A17
SA14
B17
DACK1-
C11
SD8
D11
DREQ5
A18
SA13
B18
DREQ1
C12
SD9
D12
DACK6-
A19
SA12
B19
REFRESH-
C13
SD10
D13
DREQ6
A20
SA11
B20
SYSCLK
C14
SD11
D14
DACK7-
A21
SA10
B21
IRQA7
C15
SD12
D15
DREQ7
A22
SA9
B22
IRQA6
C16
SD13
D16
Vcc
A23
SA8
B23
IRQA5
C17
SD14
D17
MASTER-
A24
SA7
B24
IRQA4
C18
SD15
D18
GND
A25
SA6
B25
IRQA3
Motherboard Description
1.10 Jumper Settings
4 5 6
J1F1
1 2 3
4 5 6
4 5 6
4 5 6
4 5 6
1 2 3
1 2 3
1 2 3
1 2 3
A
B
C
D
J7K1
1
4
O M0 4 29 3
Figure 6. Jumper Locations
25
ATX Motherboard Technical Product Specification
1.10.1
Configuration Jumper Settings
These jumpers allow you to set the basic motherboard configuration.
Table 1.
Configuration Jumper Settings
Function
Jumper
Configuration
CMOS Clear
J7K1-A
4-5 Keep (Default)
5-6 Clear
Password Clear
J7K1-A
1-2 Password Enabled (Default)
2-3 Password Clear/Disabled
CMOS Setup Access
J7K1-B
* 1-2 Access Allowed (Default)
2-3 Access Denied
VRE/OVD
J7K1-B
4-5 VRE (Default)
5-6 OVD
CAUTION: This jumper should not be changed
unless changing to a new processor type.
1.10.2
CPU Configuration (J7K1-B, C, D)
These jumpers allow the motherboard to be switched between different speeds of the Pentium
processor. These jumpers also affect the PCI and ISA clock speeds according to the following
table.
Table 2.
26
CPU/SYSTEM Speed Settings
CPU Freq.
(MHz)
Host Bus Freq.
(MHz)
J7K1-C
K7K1-D
166
66
1-2,5-6
2-3,5-6
2.5
150
60
2-3,4-5
2-3,5-6
2.5
133
66
1-2,5-6
2-3,4-5
2
120
60
2-3,4-5
2-3,4-5
2
100
66
1-2,5-6
1-2,4-5
1.5
90
60
2-3,4-5
1-2,4-5
1.5
75
50
2-3,5-6
1-2,4-5
1.5
reserved
-
2-3,5-6
1-2,5-6
reserved
-
2-3,4-5
1-2,5-6
reserved
-
1-2,5-6
1-2,5-6
CPU Clock Multiplier
Motherboard Description
1.10.3
Clear CMOS (J7K1-A, Pins 4,5,6)
Allows CMOS settings to be reset to default values by moving the jumper from pins 4-5 to pins
5-6 and turning the system on. When the system reports that “NVRAM cleared by jumper”, the
system can be turned off, and the jumper should be returned to the 4-5 position to restore normal
operation. This procedure should be done whenever the system BIOS is updated. Default is for
this jumper to be on pins 4-5.
1.10.4
Password Clear (J7K1-A, Pins 1,2,3)
Allows system password to be cleared by moving the jumper from pins 1-2 to pins 2-3 and turning
the system on. The system should then be turned off and the jumper should be returned to the 3-5
position to restore normal operation. This procedure should only be done if the user password has
been forgotten. The password function is effectively disabled if this jumper is in the 1-3 position.
Default is for the password to be enabled (3-5 position).
1.10.5
CMOS Setup Access (J7K1-B, Pins 1,2,3)
Allows access to CMOS Setup utility to be disabled by moving this jumper from the 1-2 position
to the 2-3 position. Default is for access to setup to be enabled (1-2 position)
1.10.6
VR/OVD (J7K1-B, Pins 4,5,6)
This jumper block changes the output of the on-board voltage regulator. The default setting
(pins 4-5) should be jumpered for processors that require the VR specification (3.3 V.). Pins 5-6
should be jumpered for OverDrive processors. Check the microprocessor's documentation for the
correct setting. This jumper should not be changed by the user unless changing to a new processor
type.
1.10.7
Program Boot Block Enable (J1F1, Pins 4,5,6)
This jumper allows the boot block to be programmed when set to Program (pins 5-6). The default
setting is Protect (pins 4-5).
CAUTION
Changing this jumper and reprogramming the boot block could cause unreliable operation.
1.10.8
Recovery Boot Enable (J1F1, Pins 1,2,3)
This jumper allows the BIOS to be recovered if it has been corrupted. To set the jumper to
Recover, move the jumper from pins 1-2 to pins 2-3. Default setting is for Normal
operation (pins 1-2).
27
ATX Motherboard Technical Product Specification
1.11 Reliability
The Mean-time-Between-Failures (MTBF) data is calculated from predicted data @ 55C.
Motherboard
109,302 hours
1.12 Environmental
Table 3.
Motherboard Environmental Specifications
Parameter
Specification
Temperature
o
o
Non-operating
-40 C to +70 C
Operating
+0 C to +55 C
o
o
Vibration
Unpackaged
5 Hz to 20 Hz : 0.01g² Hz sloping up to 0.02 g² Hz
20 Hz to 500 Hz : 0.02g² Hz (flat)
Packaged
10 Hz to 40 Hz : 0.015g² Hz (flat)
40 Hz to 500 Hz : 0.015g² Hz sloping down to 0.00015 g² Hz
1.13 Power Consumption
Tables 4 and 5 list the voltage and current specifications for a hypothetical system configured with
the motherboard and the following components: a 133 MHz Pentium Processor, 8 MB RAM,
256 KB cache, 3.5-inch floppy drive, 540 MB hard drive and running at the DOS prompt. This
information is provided only as a guide for calculating approximate total system power usage with
additional resources added.
Table 4.
28
DC Voltage
DC Voltage
Acceptable Tolerance
+5V
+/- 5%
+5V SB (stand by)
+/- 5%
-5V
+/- 5%
+12V
+/- 5%
-12V
+/- 5%
Motherboard Description
Table 5.
Power Usage
DC (milliamps)
AC (watts)
+5 V
-5 V
+12 V
-12 V
35
980
0
200
30
No APM enabled
DOS prompt
APM enabled
DOS prompt
20
1.14 Regulatory Compliance
This printed circuit assembly complies with the following safety and EMI regulations when
correctly installed in a compatible host system.
1.14.1
1.14.1.1
Safety
UL 1950 - CSA 950-95, 3rd edition, Dated 3-28-95
The Standard for Safety of Information Technology Equipment including Electrical Business
Equipment. (USA & Canada).
1.14.1.2
CSA C22.2 No. 950-93, 3rd Edition
The Standard for Safety of Information Technology Equipment including Electrical Business
Equipment. (Canada)
1.14.1.3
EN 60 950, 2nd Edition, 1992 (with Amendments. 1, 2 & 3)
The Standard for Safety of Information Technology Equipment including Electrical Business
Equipment. (European Union)
1.14.1.4
IEC 950, 2nd edition, 1991 (with Amendments 1, 2 & 3)
The Standard for Safety of Information Technology Equipment including Electrical Business
Equipment. (International)
1.14.1.5
EMKO-TSE (74-SEC) 207/94
Summary of Nordic deviations to EN 60 950. (Norway, Sweden, Denmark & Finland)
1.14.2
1.14.2.1
EMI
FCC Class B
Title 47 of the Code of Federal Regulations, Parts 2 & 15, Subpart B, pertaining to unintentional
radiators. (USA)
29
ATX Motherboard Technical Product Specification
1.14.2.2
CISPR 22, 2nd Edition, 1993
Limits and methods of measurement of Radio Interference Characteristics of Information
Technology Equipment. (International)
1.14.2.3
EN 55 022, 1995
Limits and methods of measurement of Radio Interference Characteristics of Information
Technology Equipment. (Europe)
1.14.2.4
EN 50 082-1 (1992)
Generic Immunity Standard; Currently compliance is determined via testing to IEC 801-2, -3 and
-4. (Europe)
1.14.2.5
VCCI Class 2 (ITE)
Implementation Regulations for Voluntary Control of Radio Interference by Data Processing
Equipment and Electronic Office Machines. (Japan)
1.14.2.6
ICES-003, Issue 2
Interference-Causing Equipment Standard, Digital Appartus. (Canada)
1.14.3
Product Certification Markings
This printed circuit assembly has the following product certification markings:
•
•
•
1.14.4
European CE Marking: Consists of a marking on the board or shipping container.
UL Recognition Mark: Consists of the UL File No. E139761 on the component side of the
board and the PBA No. on the solder side of the board. Board material flammability is 94V-1
or -0.
Canadian Compliance: Consists of small c followed by a stylized backward UR on component
side of board.
Use Only for Intended Applications
This product was evaluated for use in systems that will be installed in offices, homes, schools,
computer rooms or similar applications. Other applications, such as medical, industrial, alarm
systems and test equipment may necessitate a re-evaluation of the product suitability.
30
2 Motherboard Resources
Table 6.
Memory Map
Address Range
(Decimal)
Address Range (hex)
Size
960K-131072K
100000-8000000
127.25M Extended Memory
944K-959K
FE000-FFFFF
8K
Boot Block (erasable only if jumpered)
936K-943K
FD000-FDFFF
4K
ESCD (Plug and Play configuration area)
Description
928K-935K
FC000-FCFFF
4K
OEM LOGO & Vital Product Data Area
896K-927K
E0000-FBFFF
112K
AMI System BIOS
800-895K
C8000-DFFFF
96K
Available HI DOS memory (open to ISA and
PCI bus)
640K-799K
A0000-C7FFF
160K
Off-board video memory and BIOS
639K
9FC00-9FFFF
1K
Extended BIOS Data (moveable by QEMM,
386MAX)
512K-638K
80000-9FBFF
127K
Extended conventional
0K-511K
00000-7FFFF
512K
Conventional
Table 7.
I/O Map
Address
(hex)
Size
Address
(hex)
0000 - 000F
16 bytes PIIX3 - DMA 1
Size
Description
0278 - 027B
4 bytes
Parallel Port 2
0020 - 0021
2 bytes
PIIX3 - Interrupt Controller 02F8 - 02FF
1
8 bytes
On-Board Serial Port 2
002E - 002F
2 bytes
87306B Base
Configuration
0376
1 byte
Sec IDE Chan Cmd Port
0040 - 0043
4 bytes
PIIX3 - Timer 1
0377
1 byte
Sec IDE Chan Stat Port
0060
1 byte
Keyboard Controller Byte
- Reset IRQ
0378 - 037F
8 bytes
Parallel Port 1
0061
1 byte
PIIX3 - NMI, speaker
control
03BC - 03BF
4 bytes
Parallel Port 3
0064
1 byte
Kbd Controller,
CMD/STAT Byte
03E8 - 03EF
8 bytes
Serial Port 3
0070, bit 7
1 bit
PIIX3 - Enable NMI
03F0 - 03F5
6 bytes
Floppy Channel 1
0070, bits 6:0 7 bits
PIIX3 - Real Time Clock,
Address
03F6
1 byte
Pri IDE Chan Cmd Port
0071
PIIX3 - Real Time Clock,
Data
03F7 (Write)
1 byte
Floppy Chan 1 Cmd
1 byte
Description
continued ☛
31
ATX Motherboard Technical Product Specification
Table 7.
I/O Map (continued)
Address
(hex)
Size
Description
Address
(hex)
Size
Description
0078
1 byte
Reserved - Brd. Config.
03F7, bit 7
1 bit
Floppy Disk Chg Chan 1
0079
1 byte
Reserved - Brd. Config.
03F7, bits 6:0 7 bits
Pri IDE Chan Status Port
0080 - 008F
16 bytes PIIX3 - DMA Page
Register
03F8 - 03FF
8 bytes
On-board Serial Port 1
00A0 - 00A1
2 bytes
PIIX3 - Interrupt
Controller 2
04D0 - 04D1
2 bytes
Edge/level triggered
00B2
1 byte
APM control port
LPT + 400h
8 bytes
ECP port, LPT + 400h
00B3
1 byte
APM status port
00C0 - 00DE
31 bytes PIIX3 - DMA 2
0CF8 0CFB*
4 bytes
PCI Config Address Reg.
00F0
1 byte
Reset Numeric Error
0CFC-0CFF*
4 bytes
PCI Config Data Reg
0170 - 0177
8 bytes
Secondary IDE Channel
FF00 - FF07
8 bytes
IDE Bus Master Reg.
01F0 - 01F7
8 bytes
Primary IDE Channel
*
Only by DWORD accesses.
2.1 Soft-off Control
The motherboard design supports Soft-off control via the SMM code in the BIOS. This feature is a
manufacturing option. The CS1 pinout of the I/O controller is connected to the Soft-off control
line in the power supply circuit. The registers in the I/O controller that set the I/O address and
control of the CS1 pin are NOT setup until the SMM code is activated. The code performs the
following operations:
•
•
•
•
•
•
OUT 0Ch to I/O port 2Eh
OUT 75h to I/O port 2Fh
OUT 11h to I/O port 2Eh
OUT 00h to I/O port 2Fh
OUT 0Dh to I/O port 2Eh
OUT A0h to I/O port 2Fh
After setting the above registers, any read operation to I/O location 75H will trigger the Soft-off
circuit and turn the power supply off.
32
Motherboard Resources
Table 8.
PCI Configuration Space Map
Bus Number
(hex)
Dev Number
(hex)
Function
Number (hex)
Description
00
00
00
00
Intel 82437HX (TXC)
07
00
Intel 82371SB (PIIX3 ) PCI/ISA bridge
00
07
01
Intel 82371SB (PIIX3 ) IDE Bus Master
00
0D
00
PCI Expansion Slot: J4E2
00
0E
00
PCI Expansion Slot: J4E1
00
0F
00
PCI Expansion Slot: J4D1
00
10
00
PCI Expansion Slot: J4C1
Table 9.
DMA Channels
DMA
Data Width
0
8- or 16-bits
1
8- or 16-bits
Parallel Port
2
8- or 16-bits
Floppy
3
8- or 16-bits
Parallel Port (for ECP/EPP Config.)
4
System Resource
Reserved - Cascade channel
5
16-bits
Open
6
16-bits
Open
7
16-bits
Open
33
ATX Motherboard Technical Product Specification
Table 10.
34
Interrupts
IRQ
System Resource
NMI
I/O Channel Check
0
Reserved, Interval Timer
1
Reserved, Keyboard buffer full
2
Reserved, Cascade interrupt from slave PIC
3
Serial Port 2
4
Serial Port 1
5
Parallel Port 1 (PNP0 option)
6
Floppy
7
Parallel Port 1
8
Real Time Clock
9
User available
10
User available
11
User available
12
Onboard Mouse Port if present, else user available
13
Reserved, Math coprocessor
14
Primary IDE if present, else user available
15
Secondary IDE if present, else user available
3 Motherboard BIOS and Setup Utility
3.1 Introduction
The motherboard uses an Intel BIOS, which is stored in Flash EEPROM and easily upgraded using
a floppy disk-based program. In addition to the Intel BIOS, the Flash EEPROM also contains the
Setup utility, Power-on Self Tests (POST), APM 1.1, the PCI auto-configuration utility, and
Windows 95 ready Plug and Play. This motherboard also supports system BIOS shadowing,
allowing the BIOS to execute from 64-bit on-board write-protected DRAM.
The BIOS displays a sign-on message during POST identifying the type of BIOS and a five-digit
revision code. The initial production BIOS in the motherboard will be identified as 1.00.01.DB0.
Information on BIOS functions can be found in the IBM PS/2 and Personal Computer BIOS
Technical Reference published by IBM, and the ISA and EISA Hi-Flex AMIBIOS Technical
Reference published by AMI. Both manuals are available at most technical bookstores.
3.2 BIOS Flash Memory Organization
The Intel PA28FB100BX 1 Mb Flash component is organized as 128K x 8 (128 KB). The Flash
device is divided into four areas, as described in Table 11.
Table 11.
Flash Memory Organization
System Address
FLASH Memory Area
FE000H
FFFFFH
8 KB Boot Block (erasable only if jumpered)
FD000H
FDFFFH
4 KB Plug and Play ESCD Storage Area
FC000H
FCFFFH
4 KB Custom LOGO and Vital Product Data
E0000H
FBFFFH
112 KB System BIOS Reserved during boot
3.3 BIOS Upgrades
Flash memory makes distributing BIOS upgrades easy. A new version of the BIOS can be
installed from a diskette. BIOS upgrades are available to be down loaded from the secure section
on the Intel bulletin board, or Intel’s FTP site, or call your local Intel sales office.
The disk-based Flash upgrade utility, FMUP.EXE, has three options for BIOS upgrades:
•
•
•
The Flash BIOS can be updated from a file on a disk;
The current BIOS code can be copied from the Flash EEPROM to a disk file as a backup in the
event that an upgrade cannot be successfully completed; or
The BIOS in the Flash device can be compared with a file to ensure the system has the correct
version.
The upgrade utility ensures the upgrade BIOS extension matches the target system to prevent
accidentally installing a BIOS for a different type of system.
35
ATX Motherboard Technical Product Specification
3.4 PCI IDE Support
The two local bus IDE connectors with independent I/O channel support are setup up automatically
by the BIOS if the user selects “Autoconfiguration” in setup. The IDE interface supports PIO
Mode 3, and Mode 4 hard drives and recognition of ATAPI CD-ROMs, tape drives, and any other
ATAPI devices. The BIOS will determine the capabilities of each drive and configure them to
optimize capacity and performance. For the high capacity hard drives typically available today, the
drive will be automatically be configured for Logical Block Addressing (LBA) for maximum
capacity and to PIO Mode 3 or 4 depending on the capability of the drive. The user is able to
override the auto-configuration options by using the manual mode setting. The ATAPI
Specification Revision 2.5 recommends that an ATAPI device be configured as shown in the table
below.
Table 12.
Recommendations for Configuring an ATAPI Device
Primary Cable
Drive 0
Secondary Cable
Drive 1
Drive 0
Drive 1
ATA
Normal, no ATAPI
ATA
ATA
ATAPI
Disk and CD-ROM for enhanced
IDE systems
ATAPI
ATA
Legacy IDE System with only one
cable
ATAPI
ATAPI
Enhanced IDE with CD-ROM and
a tape or two CD-ROMs
3.5 PCI Auto-configuration
The PCI auto-configuration utility operates in conjunction with the system Setup utility to allow
the insertion and removal of PCI cards to the system without user intervention (Plug and Play).
When the system is turned on after adding a PCI add-in card, the BIOS automatically configures
interrupts, I/O space, and other parameters. PCI interrupts are distributed to available ISA
interrupts that have been not been assigned to an ISA card, or system resources. Those interrupts
left set to “available” in the CMOS setup will be considered free for PCI add-in card use. It is
nondeterministic as to which PCI interrupt will be assigned to which ISA IRQ.
The PCI auto-configuration function complies with version 2.10 of the PCI BIOS specification.
System configuration information is stored in ESCD format. The ESCD data may be cleared by
setting the CMOS clear jumper to the ON position.
PCI specification 2.1 for add-in card auto-configuration is also a part of the Plug and Play BIOS.
Peer-to-peer hierarchical PCI Bridge 1.0 is supported, and by using an OEM supplied option ROM
or TSR, a PCI-to-PCMCIA bridge capability is possible as well.
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Motherboard BIOS and Setup Utility
3.6 ISA Plug and Play
The BIOS incorporates ISA Plug and Play capabilities as delivered by Plug and Play Release 1.0A
(Plug and Play BIOS V.. 1.0A, ESCD V.. 1.03). When used in conjunction with the ISA
Configuration Utility (ICU) for DOS or Windows 3.x, the system allows auto-configuration of
Plug and Play ISA cards, PCI cards, and resource management for legacy ISA cards. Because the
BIOS supports configuring devices across PCI bridges, release 1.41 or greater of the ICU must be
used with the motherboard to properly view and change system settings. System configuration
information is stored in ESCD format. The ESCD data may be cleared by setting the CMOS clear
jumper to the ON position .
The BIOS also has a setup option to support the Windows 95 run time plug and play utilities.
When this option is selected, only devices critical to booting are assigned resources by the BIOS.
Device Node information is available for all devices to ensure compatibility with Windows 95.
Copies of the IAL Plug and Play specification may be obtained via the Intel BBS, or via
CompuServe by typing Go PlugPlay.
3.7 Advanced Power Management
The BIOS has support for Advanced Power Management (APM version 1.1). The energy saving
Stand By mode can be initiated by a keyboard hot key sequence set by the user, a time-out period
set by the user, or by a suspend/resume button tied to the front panel sleep connector.
When in Stand-by mode, the motherboard reduces power consumption by utilizing the Pentium
processor’s System Management Mode (SMM) capabilities and also spinning down hard drives
and turning off VESA DPMS compliant monitors. The user may select which DPMS mode (Stand
By, Suspend, or Off) send to the monitor in setup. The ability to respond to external interrupts is
fully maintained while in Stand-by mode allowing the system to service requests such as in-coming
Fax’s or network messages while unattended. Any keyboard or mouse activity brings the system
out of the energy saving Stand By mode. When this occurs the monitor and IDE drives are turned
back on immediately.
APM is enabled in BIOS by default, however, the system must be configured with an APM driver
in order for the system power saving features to take effect. Windows 95 will enable APM
automatically upon detecting the presence of the APM BIOS.
3.8 Language Support
The BIOS setup screen and help messages are supported in 32 languages. There are 5 languages
translated at this time for use; American English, German, Italian, French, and Spanish.
Translations of other languages will available at a later date.
With a 1 Mb Flash BIOS, only one language can be resident at a time. The default language is
American English, and will always be present unless another language is programmed into the
BIOS using the Flash Memory Update Program (FMUP) available on the Intel BBS.
37
ATX Motherboard Technical Product Specification
3.9 Boot Options
Booting from CD-ROM is supported in adherence to the “El Torito” bootable CD-ROM format
specification developed by Phoenix Technologies and IBM. Under the Boot Options field in setup,
CD-ROM is one of four possible boot devices which are defined in priority order. The default
setting is for floppy to be the primary boot device and hard drive to be the secondary boot device.
If CD-ROM is selected, it must be the first device. The third and fourth devices are set to disabled
in the default configuration. The user can add also select network as a boot device. The network
option allows booting from a network add-in card with a remote boot ROM installed.
✏
NOTE
A copy of “El Torito” is available from Phoenix Web page
(http://www.ptltd.com/techs/specs.html).
3.10 Flash LOGO Area
The motherboard supports a 4 KB programmable FLASH user area located at EC000-ECFFF. An
OEM may use this area to display a custom logo. The BIOS accesses the user area just after
completing POST. A utility is available from Intel to assist with installing a logo into flash for
display during POST. Contact your local Intel Sales office or authorized distributor for further
information.
3.11 Setup Enable Jumper
A motherboard configuration jumper controls access to the BIOS Setup utility. By setting the
jumper to the disable position, the user is prevented from accessing the Setup utility during the
Power-on Self Test or at any other time. The message prompting the user to press <F1> to enter
setup is also disabled.
3.12 BIOS Setup Utility
The ROM-based Setup utility allows the configuration to be modified without opening the system
for most basic changes. The Setup utility is accessible only during the Power-on Self Test (POST)
by pressing the <F1> key after the POST memory test has begun and before boot begins. A
prompt may be enabled that informs users to press the <F1> key to access Setup. A jumper setting
on the motherboard can be set to prevent user access to Setup for security purposes.
3.12.1
Overview of the Setup Menu Screens
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> will bring up a
subscreen. After you have selected an item, use the arrow keys to modify the setting.
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Motherboard BIOS and Setup Utility
Table 13.
Overview of the Setup Menu Screens
Setup Menu Screen
Description
Main
For setting up and modifying some of the basic options of a PC, such as time,
date, diskette drives, hard drives.
Advanced
For modifying the more advanced features of a PC, 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.
Setup Subscreen
Description
Floppy Options
For configuring your diskette drives.
Hard Disk Configuration
For configuring your 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.
Power Management
Configuration
For accessing and modifying Advanced Power Management (APM) options.
Plug and Play
Configuration
For modifying options that affect the system’s Plug and Play capabilities.
3.12.2
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., Hard Disk), the Setup program switches to a subscreen for the
selected option.
3.12.2.1
System Date
Specifies the current date. Select the month from a pop-up menu.
3.12.2.2
System Time
Specifies the current time. Type over the current time to set a new time.
3.12.2.3
Floppy Options
When selected, this pops up the Floppy Options menu.
3.12.2.4
Hard Disk C:, D:, E:, F:
Reports if a hard disk is connected to the system. When selected, this brings up the Hard Disk
Configuration subscreen.
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ATX Motherboard Technical Product Specification
3.12.2.5
Language
Specifies the language of the text strings used in the Setup program and the BIOS. The options are
any installed languages.
3.12.2.6
Boot Options
When selected, this brings up the Boot Options subscreen.
3.12.2.7
Video Mode
Reports the video mode. There are no options.
3.12.2.8
Mouse
Reports if a mouse is installed or not. There are no options.
3.12.2.9
Base Memory
Reports the amount of base memory. There are no options.
3.12.2.10
Extended Memory
Reports the amount of extended memory. There are no options.
3.12.2.11
BIOS Version
Reports the version of the BIOS installed. There are no options.
3.12.3
3.12.3.1
Floppy Options Subscreen
Floppy A:
Reports if a diskette drive is connected to the system. There are no options.
3.12.3.2
Floppy B:
Reports if a second diskette drive is connected to the system. There are no options.
3.12.3.3
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.
3.12.3.4
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.
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Motherboard BIOS and Setup Utility
3.12.3.5
Floppy Access
Sets whether the floppy drive is writeable or not. The options are READ/WRITE or READ
ONLY.
3.12.4
3.12.4.1
Hard Disk Configuration Subscreen
IDE Device Configuration
Used to manually configure the hard drive or have the system auto configure it. The options are
Auto Configured and User Definable. The default is Auto Configured. If you select User
Definable then the Number of Cylinders, Number of Heads, and Number of Sectors items can be
modified.
3.12.4.2
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.
3.12.4.3
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.
3.12.4.4
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.
3.12.4.5
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.
3.12.4.6
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.
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ATX Motherboard Technical Product Specification
3.12.4.7
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.
3.12.4.8
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.
3.12.5
Boot Options Subscreen
This section describes the options available on the Boot Options subscreen.
3.12.5.1
First, Second, Third, Fourth Boot Device
Sets which drives the system checks to find an operating system to boot from. The following
options are available:
First Boot Device:
Select Disabled, Floppy, Hard Disk, CD-ROM, Network.
Second, Third, Fourth Device:
Select Disabled, Floppy, Hard Disk, Network.
3.12.5.2
System Cache
Enables or disables both the primary and the secondary cache memory. The options are Enabled or
Disabled. The default is Enabled.
3.12.5.3
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.
3.12.5.4
Num Lock
Sets the beginning state of the Num Lock feature on your keyboard. The options are On and Off.
The default is Off.
3.12.5.5
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.
42
Motherboard BIOS and Setup Utility
3.12.5.6
Hard Disk Pre-delay
Sets the hard disk drive pre-delay. The options are Disabled, 3, 6, 9, 12, 15, 21 or 30 seconds.
The default is 3 seconds. When enabled, this option causes the BIOS to wait the specified time
before it accesses the first hard drive. If your system contains a hard drive, and you don’t see the
drive type displayed during boot-up, the hard drive may need more time before it is able to
communicate with the controller. Setting a pre-delay provides additional time for the hard drive to
initialize.
3.12.5.7
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.
3.12.5.8
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.
3.12.5.9
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.
3.12.6
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
subscreen for the selected option. Subscreens are described in the sections following the
description of the Advanced screen options.
3.12.6.1
Processor Type
Reports the CPU type. There are no options.
3.12.6.2
Processor Speed
Reports the CPU clock speed. There are no options.
3.12.6.3
Cache Size
Reports the size of the secondary cache. There are no options. If your system contains no L2
cache, this item will not appear.
3.12.6.4
Peripheral Configuration
When selected, this brings up the Peripheral Configuration subscreen.
43
ATX Motherboard Technical Product Specification
3.12.6.5
Advanced Chipset Configuration
When selected, this brings up the Advanced Chipset Configuration subscreen.
3.12.6.6
Power Management Configuration
When selected and enabled, this brings up the Advanced Power Management subscreen.
3.12.6.7
Plug and Play Configuration
When selected, this brings up the Plug and Play Configuration subscreen.
3.12.7
Peripheral Configuration Subscreen
This section describes the screens for the peripheral configuration subscreen.
3.12.7.1
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.
3.12.7.2
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.)
3.12.7.3
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.)
3.12.7.4
Serial Port 1 Address
Selects the address of the serial port. The options are Disabled; COM1, 3F8h, IRQ4; and COM3,
3E8h, IRQ4. 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, regardless of what is selected under the Serial Port 1 Address option. (If Configuration
Mode is set to Auto, this option cannot be modified.)
3.12.7.5
Serial Port 2 Address
Selects the address of the serial port. The options are Disabled; COM2, 2F8h, IRQ3 and COM3,
3E8h, IRQ4. 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, regardless of what is selected under the Serial Port 2 Address option. (If Configuration
Mode is set to Auto, this option cannot be modified.)
44
Motherboard BIOS and Setup Utility
✏
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 address will not appear in the options dialog box of either serial port.
3.12.7.6
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.)
3.12.7.7
Parallel Port Address
Selects the address and IRQ of the parallel port. The options are Disabled; LPT3, 3BCh, IRQ7;
LPT1, 378h, IRQ7; LPT2, 278, IRQ7; LPT3, 3BC, IRQ5; 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.)
3.12.7.8
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, bidirectionally. This option is not affected by the
Configuration Mode field above.
3.12.8
Advanced Chipset Configuration Subscreen
This section describes the options available on the Advanced Chipset Configuration Subscreen.
3.12.8.1
Base Memory Size
Sets the size of the base memory. The options are 512 KB and 640 KB. The default is 640 KB.
3.12.8.2
ISA LFB Size
Sets the size of the linear frame buffer. The options are Disabled and 1 MB. The default is
Disabled. If this is set to 1 MB, then the ISA LFB Base Address field will appear.
3.12.8.3
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.
3.12.8.4
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.
45
ATX Motherboard Technical Product Specification
3.12.8.5
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.
3.12.8.6
Memory Error Correction
Reports if error correction is supported by the memory modules installed. There are no options.
3.12.8.7
Bank 0 SIMM Detected
Reports the type of memory found in the bank 0 SIMM slots. There are no options.
3.12.8.8
Bank 1 SIMM Detected
Reports the type of memory found in the bank 1 SIMM slots. There are no options.
3.12.9
Power Management Configuration Subscreen
This section describes the options available on the Power Management Subscreen.
3.12.9.1
Advanced Power Management
Enables or disables the Advanced Power Management (APM) support in your system’s BIOS. The
options are Enabled and Disabled. The default is Disabled. Power Management will only work
with APM-capable operating systems to manage power consumption in your system. If Advanced
Power Management is set to Disabled, none of the fields in the Advanced Power Management
subscreen will be visible.
3.12.9.2
IDE Drive Power Down
Sets any IDE drives to spin down when the system goes into power managed mode. The options
are Enabled and Disabled. The default is Enabled.
3.12.9.3
Inactivity Timer
Sets how long the system must be inactive before it enters power managed mode. Enter the
number of minutes. The range is 0 to 255 minutes. The default is 10 minutes.
3.12.9.4
Hot Key
Sets the hot key that, when pressed while holding down the <Ctrl> and <Alt> keys, causes the
system to enter power managed mode. All alphabetic keys are valid.
3.12.10
Plug and Play Configuration Subscreen
This section describes the options found on the Plug and Play configuration subscreen.
46
Motherboard BIOS and Setup Utility
3.12.10.1
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.
3.12.10.2
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.
3.12.10.3
ISA Shared Memory Size
Enables you to “unshadow” a block of the upper memory area. 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.
Shadowing is a technique that copies a block of memory from an add-in card’s ROM to the same
address in system memory. This provides faster access and achieves higher performance. By
default, all upper memory is shadowed.
3.12.10.4
ISA Shared Memory Base Address
Sets the base address for the ISA Shared Memory. The options are C8000h, CC000h, D0000h,
D4000h, D8000h, and D0000h. 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.
3.12.10.5
IRQ 3, 4, 5, 7, 9, 10, 11, 12
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 agent that uses one of these
interrupts, select Used By ISA Card for that interrupt.
✏
NOTE
IRQ 3, 4, 5, and 7 may not be available in this option, depending on the setting chosen for the
COM1, COM2 and parallel ports in the Peripheral Configuration Subscreen.
3.12.11
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.
47
ATX Motherboard Technical Product Specification
3.12.11.1
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 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 power
management hot key, the User password, the security hot key, and unattended start.
Table 14.
Administrative and User Password Functions
Administrative mode
can . . .
User mode
can . . .
Password Required During
Boot Process
Neither
Can change all
options*
Can change all
options*
None
Administrative only
Can change all options Can change a limited
number of options
User only
N/A
Both
Can change all options Can change a limited
number of options
Password Set
*
None
Can change all options User
Administrative or User
If no password is set, any user can change all Setup options.
3.12.12
3.12.12.1
Security Screen Options
User Password is
Reports if there is a User password set. There are no options.
3.12.12.2
Administrative Password is
Reports if there is an Administrative password set. There are no options.
3.12.12.3
Set User Password
Sets the User password. The password can be up to seven alphanumeric characters.
48
Motherboard BIOS and Setup Utility
3.12.12.4
Set Administrative Password
Sets the Administrative password. The password can be up to seven alphanumeric characters.
3.12.13
Exit Screen
This section describes the different ways to exit and save or not save changes made in the Setup
program.
3.12.13.1
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.
3.12.13.2
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.
3.12.13.3
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.
3.12.13.4
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.
49
4 Error Messages and Beep Codes
4.1 BIOS Beep Codes
Beeps
Error Message
Description
1
Refresh Failure
The memory refresh circuitry on the motherboard is faulty.
2
Parity Error
Parity is not supported on this product, will not occur.
3
Base 64 KB Memory Failure
Memory failure in the first 64 KB.
4
Timer Not Operational
Memory failure in the first 64 KB of memory, or Timer 1 on the
motherboard is not functioning.
5
Processor Error
The CPU on the motherboard generated an error.
6
8042 - Gate A20 Failure
The keyboard controller (8042) may be bad. The BIOS cannot
switch to protected mode.
7
Processor Exception Interrupt
Error
The CPU generated an exception interrupt.
8
Display Memory Read/Write
Error
The system video adapter is either missing or its memory is
faulty. This is not a fatal error.
9
ROM Checksum Error
ROM checksum value does not match the value encoded in
BIOS.
10
CMOS Shutdown Register
Rd/Wrt Error
The shutdown register for CMOS RAM failed.
4.2 PCI Configuration Error Messages
The following PCI messages are displayed as a group with bus, device and function information.
<'NVRAM Checksum Error, NVRAM Cleared'>, \ ; String
<'System Board Device Resource Conflict'>, \ ; String
<'Primary Output Device Not Found'>, \ ; String
<'Primary Input Device Not Found'>, \ ; String
<'Primary Boot Device Not Found'>, \ ; String
<'NVRAM Cleared By Jumper'>, \ ; String
<'NVRAM Data Invalid, NVRAM Cleared'>, \ ; String
<'Static Device Resource Conflict'>, \ ; String
The following messages chain together to give a message such as:
PCI I/O Port Conflict: Bus: 00, Device 0D, Function: 01
51
ATX Motherboard Technical Product Specification
If and when more than 15 PCI conflict errors are detected the log full message is displayed.
<'PCI I/O Port Conflict:'>, \ ; String
<'PCI Memory Conflict:
'>, \ ; String
<'PCI IRQ Conflict:
'>, \ ; String
<' Bus '>, \
; String
<', Device '>, \
; String
<', Function '>, \
; String
<‘,PCI Error Log is Full.'>, \ ; String
<'Floppy Disk Controller Resource Conflict '>, \ ; Text
<'Primary IDE Controller Resource Conflict '>, \ ; Text
<'Secondary IDE Controller Resource Conflict '>, \ ; Text
<'Parallel Port Resource Conflict '>, \ ; Text
<'Serial Port 1 Resource Conflict '>, \ ; Text
<'Serial Port 2 Resource Conflict '>, \ ; Text
4.3 BIOS Error Messages
Error Message
Explanation
8042 Gate - A20 Error
Gate A20 on the keyboard controller (8042) is not working. Replace the
8042.
Address Line Short!
Error in the address decoding circuitry on the motherboard.
Cache Memory Bad, Do Not
Enable Cache!
Cache memory is defective. Replace it.
CH-2 Timer Error
Most AT systems include two timers. There is an error in timer 2.
CMOS Battery State Low
CMOS RAM is powered by a battery. The battery power is low. Replace the
battery.
CMOS Checksum Failure
After CMOS RAM values are saved, a checksum value is generated for
error checking. The previous value is different from the current value. Run
AMIBIOS Setup.
CMOS System Options Not Set
The values stored in CMOS RAM are either corrupt or nonexistent. Run
Setup.
CMOS Display Type Mismatch
The video type in CMOS RAM does not match the type detected by the
BIOS. Run AMIBIOS Setup.
CMOS Memory Size Mismatch
The amount of memory on the motherboard is different than the amount in
CMOS RAM. Run AMIBIOS Setup.
CMOS Time and Date Not Set
Run Standard CMOS Setup to set the date and time in CMOS RAM.
Diskette Boot Failure
The boot disk in floppy drive A: is corrupt. It cannot be used to boot the
system. Use another boot disk and follow the screen instructions.
Display Switch Not Proper
The display jumper is not implemented on this product, this error will not
occur.
continued ☛
52
Error Messages and Beep Codes
BIOS Error Messages (continued)
Error Message
Explanation
DMA Error
Error in the DMA controller.
DMA #1 Error
Error in the first DMA channel.
DMA #2 Error
Error in the second DMA channel.
FDD Controller Failure
The BIOS cannot communicate with the floppy disk drive controller. Check
all appropriate connections after the system is powered down.
HDD Controller Failure
The BIOS cannot communicate with the hard disk drive controller. Check all
appropriate connections after the system is powered down.
INTR #1 Error
Interrupt channel 1 failed POST.
INTR #2 Error
Interrupt channel 2 failed POST.
Invalid Boot Diskette
The BIOS can read the disk in floppy drive A:, but cannot boot the system.
Use another boot disk.
Keyboard Is Locked...Unlock It
The keyboard lock on the system is engaged. The system must be unlocked
to continue.
Keyboard Error
There is a timing problem with the keyboard. Set the Keyboard option in
Standard CMOS Setup to Not Installed to skip the keyboard POST routines.
KB/Interface Error
There is an error in the keyboard connector.
Off Board Parity Error
Parity error in memory installed in an expansion slot. The format is:
OFF BOARD PARITY ERROR ADDR (HEX) = (XXXX)
XXXX is the hex address where the error occurred.
On Board Parity Error
Parity is not supported on this product, this error will not occur.
Parity Error ????
Parity error in system memory at an unknown address.
4.4 ISA NMI Messages
ISA NMI Message
Explanation
Memory Parity Error at xxxxx
Memory failed. If the memory location can be determined, it is displayed as
xxxxx. If not, the message is Memory Parity Error ????.
I/O Card Parity Error at xxxxx
An expansion card failed. If the address can be determined, it is displayed
as xxxxx. If not, the message is I/O Card Parity Error ????.
DMA Bus Time-out
A device has driven the bus signal for more than 7.8 microseconds.
53
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