Page 1
Advanced/ML
Motherboard
Technical Product Specification
Order Number 281806-002
May 1996
Page 2
Revision History
Revision
-001
-002
Revision History Date
Preliminary release of the Advanced/ML Technical Product Specification. 2/96
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
Page 3
Table of Contents
1 Motherboard Description
1.1 Overview............................................................................................................7
1.2 Motherboard Manufacturing Options..................................................................8
1.3 Form Factor .......................................................................................................9
1.4 Microprocessor...................................................................................................9
1.4.1 Microprocessor Upgrade ...................................................................... 9
1.5 Memory............................................................................................................ 10
1.5.1 Second-level Cache............................................................................10
1.5.2 Main System Memory.........................................................................10
1.6 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
1.7 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
1.8 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
1.9 Add-in Board Expansion Connectors...............................................................23
1.10 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
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ATX Motherboard Technical Product Specification
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
1.11 Reliability..........................................................................................................28
1.12 Environmental ..................................................................................................28
1.13 Power Consumption.........................................................................................28
1.14 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 Introduction ......................................................................................................35
3.2 BIOS Flash Memory Organization ...................................................................35
3.3 BIOS Upgrades................................................................................................35
3.4 PCI IDE Support...............................................................................................36
3.5 PCI Auto-configuration.....................................................................................36
3.6 ISA Plug and Play ............................................................................................37
3.7 Advanced Power Management........................................................................37
3.8 Language Support............................................................................................37
3.9 Boot Options ....................................................................................................38
3.10 Flash LOGO Area ............................................................................................38
3.11 Setup Enable Jumper.......................................................................................38
3.12 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
iv
Page 5
3.12.9 Power Management Configuration Subscreen...................................46
3.12.10 Plug and Play Configuration Subscreen.............................................46
3.12.11 Security Screen ..................................................................................47
3.12.12 Security Screen Options.....................................................................48
3.12.13 Exit Screen .........................................................................................49
4 Error Messages and Beep Codes
4.1 BIOS Beep Codes............................................................................................51
4.2 PCI Configuration Error Messages ..................................................................51
4.3 BIOS Error Messages......................................................................................52
4.4 ISA NMI Messages ..........................................................................................53
Contents
v
Page 6
Page 7
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
• Type 7 Pentium OverDrive
• Intel's 82430HX PCIset.
• PC87306B Super I/O controller.
• Bus mastering IDE.
• Supports Plug and Play and Advanced Power Management (APM).
SIMM
†
sockets, either parity, non-parity, or ECC.
socket provides an upgrade to future OverDrive processors.
7
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ATX Motherboard Technical Product Specification
AB C E F IGH
D
QOPSTRVWU
OM04289A
Figure 1. Motherboard Features
A. Flash memory device M. SRAM sites
B. 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
J
K
L
M
N
1.2 Motherboard Manufacturing Options
• 256 or 512 KB pipeline burst SRAM cache
• Support for Universal Serial Bus (USB)
8
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Motherboard Description
OM04290
6.100
0.0
0.500
0.650
0.0 ?.? 4.900
11.100
6.500
11.350
5.200
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.
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
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.
processors that run
9
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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
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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:
• 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.
1.6.2 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
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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
• Multi-mode bi-directional parallel port
Standard mode; IBM
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
compliant Infra Red interface
†
and Centronics† compatible
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
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1.7.2 Keyboard and Mouse Interface
Motherboard Description
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:
• <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.
1.7.3 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.
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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
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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.
Connectors(4)
PCI
ISA
Connectors(3)
Prim a ry
Secondary
24020
139
PCI IDE Connector(2)
234
1
5
Floppy Drive Connector
Front Panel I/O Connector Header
33
Figure 3. Motherboard Connector Locations
11
20
Power
Connector
OM04291
1
10
129
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.
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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
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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 IOCS1633 Addr 1 34 Ground
35 Addr 0 32 Addr 2
37 Chip Select 0- 38 Chip Select 139 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 Index9 Ground 10 Motor Enable A11 Ground 12 Drive Select B13 Ground 14 Drive Select A15 Ground 16 Motor Enable B17 Ground 18 DIR19 Ground 20 STEP21 Ground 22 Write Data23 Ground 24 Write Gate25 Ground 26 Track 0027 Ground 28 Write Protect29 Ground 30 Read Data31 Ground 32 Side 1 Select33 Ground 34 Diskette Change-
Motherboard Description
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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
15182025
29
SPKR IR SLEEP PWR HD LED PWR LED RST FAN
1114
34579
OM04520
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
Pin Signal Name
26 SPKR_DAT
27 SPKR_DAT
28 Key
29 Ground
1
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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
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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
Pin Signal Name
1 Ground
2 +12 V
3 Ground
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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.
PS/2
Mouse
PS/2
Keyboard
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
9RI
COM 1COM 2 Parallel Port
OM04292
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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
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
22
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Motherboard Description
Pin
B32
B33
B34
B35
B32
B37
B38
B39
B40
B41
B42
B43
B44
B45
B46
B47
B48
B49
B50
B51
B52
B53
B54
B55
B56
B57
B58
B59
B60
B61
B62
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
A1 Vcc B1 -12V A32 AD16
A2 +12V B2 GND A33 3.3V
A3 Vcc B3 GND A34 FRAME #
A4 Vcc B4 No Connect A35 GND
A5 Vcc B5 Vcc A32 TRDY #
A6 PIRQ1 # B6 Vcc A37 GND
A7 PIRQ3 # B7 PIRQ2 # A38 STOP #
A8 Vcc B8 PIRQ0 # A39 3.3V
A9 No Connect B9 PRSNT1B# A40 SDONE
A10 Vcc B10 No Connect A41 SBO #
A11 No Connect B11 PRSNT2B# A42 GND
A12 GND B12 GND A43 PAR
A13 GND B13 GND A44 AD15
A14 No Connect B14 No Connect A45 3.3V
A15 RST # B15 GND A46 AD13
A16 Vcc B16 PCLK3 A47 AD11
A17 GNT1 # B17 GND A48 GND
A18 GND B18 REQ # A49 AD9
A19 Reserved B19 Vcc A50 KEY
A20 AD30 B20 AD31 A51 KEY
A21 3.3V B21 AD29 A52 CBEO #
A22 AD28 B22 GND A53 3.3V
A23 AD26 B23 AD27 A54 AD6
A24 GND B24 AD25 A55 AD4
A25 AD24 B25 3.3V A56 GND
A26 AD25 (IDSEL) B26 CBE3 # A57 AD2
A27 3.3V B27 AD23 A58 AD0
A28 AD22 B28 GND A59 Vcc
A29 AD20 B29 AD21 A60 REQ64 #
A30 GND B30 AD19 A61 Vcc
A31 AD18 B31 3.3V A62 Vcc
Signal Name
AD17
CBE2 #
GND
IRDY #
3.3V
DEVSEL #
GND
LOCK #
PERR #
3.3V
SERR #
3.3V
CBE1 #
AD14
GND
AD12
AD10
GND
KEY
KEY
AD8
AD7
3.3V
AD5
AD3
GND
AD1
Vcc
ACK64 #
Vcc
Vcc
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ATX Motherboard Technical Product Specification
ISA Slots (J4A1, J4B1, J4B2)
Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name
A1 IOCHK- B1 GND A26 SA5 B26 DACK2A2 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 MEMCS16A8 SD1 B8 ZEROWS- C2 LA23 D2 IOCS16A9 S D0 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 DACK0A15 SA16 B15 DACK3- C9 MEMR- D9 DREQ0
A16 SA15 B16 DREQ3 C10 MEMW- D10 DACK5A17 SA14 B17 DACK1- C11 SD8 D11 DREQ5
A18 SA13 B18 DREQ1 C12 SD9 D12 DACK6A19 SA12 B19 REFRESH- C13 SD10 D13 DREQ6
A20 SA11 B20 SYSCLK C14 SD11 D14 DACK7A21 SA10 B21 IRQA7 C15 SD12 D15 DREQ7
A22 SA9 B22 IRQA6 C16 SD13 D16 Vcc
A23 SA8 B23 IRQA5 C17 SD14 D17 MASTERA24 SA7 B24 IRQA4 C18 SD15 D18 GND
A25 SA6 B25 IRQA3
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1.10 Jumper Settings
465
1
Motherboard Description
J1F1
3
2
465
J7K1
4
1
1
A B C D
Figure 6. Jumper Locations
465465465
32
132
132132
OM04293
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ATX Motherboard Technical Product Specification
K7K1-D
2-3,5-6
2-3,5-6
2-3,4-5
2-3,4-5
1-2,4-5
1-2,4-5
1-2,4-5
1-2,5-6
1-2,5-6
1-2,5-6
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. CPU/SYSTEM Speed Settings
CPU Freq.
(MHz)
166 66 1-2,5-6
150 60 2-3,4-5
133 66 1-2,5-6
120 60 2-3,4-5
100 66 1-2,5-6
90 60 2-3,4-5
75 50 2-3,5-6
reserved - 2-3,5-6
reserved - 2-3,4-5
reserved - 1-2,5-6
Host Bus Freq.
(MHz) J7K1-C
CPU Clock Multiplier
2.5
2.5
2
2
1.5
1.5
1.5
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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).
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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
Non-operating -40oC to +70oC
Operating +0oC to +55oC
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. DC Voltage
DC Voltage Acceptable Tolerance
+5V +/- 5%
+5V SB (stand by) +/- 5%
-5V +/- 5%
+12V +/- 5%
-12V +/- 5%
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Motherboard Description
-5 V
0
Table 5. Power Usage
DC (milliamps)
AC (watts) +5 V
No APM enabled
DOS prompt 35 980
APM enabled
DOS prompt 20
+12 V -12 V
200 30
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 Safety
1.14.1.1 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 EMI
1.14.2.1 FCC Class B
Title 47 of the Code of Federal Regulations, Parts 2 & 15, Subpart B, pertaining to unintentional
radiators. (USA)
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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:
• 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.
1.14.4 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.
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2 Motherboard Resources
Address
(hex)
0278 - 027B
02F8 - 02FF
0376
0377
0378 - 037F
03BC - 03BF
03E8 - 03EF
03F0 - 03F5
03F6
03F7 (Write)
Table 6. Memory Map
Address Range
(Decimal) Address Range (hex) Size Description
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)
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
640K-799K A0000-C7FFF 160K Off-board video memory and BIOS
639K 9FC00-9FFFF 1K Extended BIOS Data (moveable by QEMM,
512K-638K 80000-9FBFF 127K Extended conventional
0K-511K 00000-7FFFF 512K Conventional
Table 7. I/O Map
PCI bus)
386MAX)
Address
(hex) Size Description
0000 - 000F 16 bytes PIIX3 - DMA 1
0020 - 0021 2 bytes PIIX3 - Interrupt Controller
1
002E - 002F 2 bytes 87306B Base
Configuration
0040 - 0043 4 bytes PIIX3 - Timer 1
0060 1 byte Keyboard Controller Byte
- Reset IRQ
0061 1 byte PIIX3 - NMI, speaker
control
0064 1 byte Kbd Controller,
CMD/STAT Byte
0070, bit 7 1 bit PIIX3 - Enable NMI
0070, bits 6:0 7 bits PIIX3 - Real Time Clock,
Address
0071 1 byte PIIX3 - Real Time Clock,
Data
Size Description
4 bytes Parallel Port 2
8 bytes On-Board Serial Port 2
1 byte Sec IDE Chan Cmd Port
1 byte Sec IDE Chan Stat Port
8 bytes Parallel Port 1
4 bytes Parallel Port 3
8 bytes Serial Port 3
6 bytes Floppy Channel 1
1 byte Pri IDE Chan Cmd Port
1 byte Floppy Chan 1 Cmd
continued
☛
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ATX Motherboard Technical Product Specification
Address
(hex)
03F7, bit 7
03F7, bits 6:0
03F8 - 03FF
04D0 - 04D1
LPT + 400h
0CF8 -
0CFB*
0CFC-0CFF*
FF00 - FF07
Table 7. I/O Map (continued)
Address
(hex) Size Description
0078 1 byte Reserved - Brd. Config.
0079 1 byte Reserved - Brd. Config.
0080 - 008F 16 bytes PIIX3 - DMA Page
Register
00A0 - 00A1 2 bytes PIIX3 - Interrupt
Controller 2
00B2 1 byte APM control port
00B3 1 byte APM status port
00C0 - 00DE 31 bytes PIIX3 - DMA 2
Size Description
1 bit Floppy Disk Chg Chan 1
7 bits Pri IDE Chan Status Port
8 bytes On-board Serial Port 1
2 bytes Edge/level triggered
8 bytes ECP port, LPT + 400h
4 bytes PCI Config Address Reg.
00F0 1 byte Reset Numeric Error
0170 - 0177 8 bytes Secondary IDE Channel
01F0 - 01F7 8 bytes Primary IDE Channel
* Only by DWORD accesses.
4 bytes PCI Config Data Reg
8 bytes IDE Bus Master Reg.
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.
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Table 8. PCI Configuration Space Map
Motherboard Resources
Bus Number
(hex)
00 00 00 Intel 82437HX (TXC)
00 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
Dev Number
(hex)
Function
Number (hex) Description
Table 9. DMA Channels
DMA Data Width System Resource
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 Reserved - Cascade channel
5 16-bits Open
6 16-bits Open
7 16-bits Open
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ATX Motherboard Technical Product Specification
Table 10. 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
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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.
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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 Secondary Cable
Drive 0 Drive 1 Drive 0 Drive 1
ATA Normal, no ATAPI
ATA ATAPI Disk and CD-ROM for enhanced
IDE systems
ATA ATAPI Legacy IDE System with only one
cable
ATA 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.
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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
Power Management
Configuration
Plug and Play
Configuration
For modifying options that affect memory and system busses.
For accessing and modifying Advanced Power Management (APM) options.
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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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 Floppy Options Subscreen
3.12.3.1 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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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 Hard Disk Configuration Subscreen
3.12.4.1 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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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.
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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.
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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.)
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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.
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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.
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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.
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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
Password Set
Neither Can change all
Administrative only Can change all options Can change a limited
User only N/A Can change all options User
Both Can change all options Can change a limited
* If no password is set, any user can change all Setup options.
can . . .
options*
User mode
can . . .
Can change all
options*
number of options
number of options
3.12.12 Security Screen Options
3.12.12.1 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.
Password Required During
Boot Process
None
None
Administrative or User
3.12.12.3 Set User Password
Sets the User password. The password can be up to seven alphanumeric characters.
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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.
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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
8 Display Memory Read/Write
Error
9 ROM Checksum Error ROM checksum value does not match the value encoded in
10 CMOS Shutdown Register
Rd/Wrt Error
The CPU generated an exception interrupt.
The system video adapter is either missing or its memory is
faulty. This is not a fatal error.
BIOS.
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
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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
Address Line Short! Error in the address decoding circuitry on the motherboard.
Cache Memory Bad, Do Not
Enable Cache!
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
CMOS Checksum Failure After CMOS RAM values are saved, a checksum value is generated for
CMOS System Options Not Set The values stored in CMOS RAM are either corrupt or nonexistent. Run
CMOS Display Type Mismatch The video type in CMOS RAM does not match the type detected by the
CMOS Memory Size Mismatch The amount of memory on the motherboard is different than the amount in
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
Display Switch Not Proper The display jumper is not implemented on this product, this error will not
8042.
Cache memory is defective. Replace it.
battery.
error checking. The previous value is different from the current value. Run
AMIBIOS Setup.
Setup.
BIOS. Run AMIBIOS Setup.
CMOS RAM. Run AMIBIOS Setup.
system. Use another boot disk and follow the screen instructions.
occur.
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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
I/O Card Parity Error at xxxxx An expansion card failed. If the address can be determined, it is displayed
DMA Bus Time-out A device has driven the bus signal for more than 7.8 microseconds.
xxxxx. If not, the message is Memory Parity Error ????.
as xxxxx. If not, the message is I/O Card Parity Error ????.
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