Intel MS440GX User manual

MS440GX
Motherboard
Product Guide
Order Number: 713653-001

Revision History
Revision Revision History Date
-001 Initial release of the MS440GX Motherboard Product Guide. May 1998
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Copyright 1998, Intel Corporation.

iii
Contents
Acronyms......................................................................................................................... 9
1 Motherboard Features
Summary of Features..........................................................................................................12
Board Layout.......................................................................................................................13
Motherboard Part-Function Table........................................................................................14
Microprocessor....................................................................................................................15
Processor Packaging ..........................................................................................................15
Second Level Cache...........................................................................................................15
Processor Options...............................................................................................................15
Form Factor.........................................................................................................................16
Chipset................................................................................................................................16
82443GX PCI/A.G.P. Controller (PAC) (H)..........................................................................17
Intel®82371EB Xcelerator (PIIX4E) (Q)..............................................................................18
Intel®82093AA I/O Advanced Programmable Interrupt Controller (IOAPIC).......................19
IDE Support.........................................................................................................................19
Real-Time Clock, CMOS RAM, and Battery........................................................................20
Diskette Drive Controller......................................................................................................20
Accelerated Graphics Port (A.G.P.) Support .......................................................................21
Memory...............................................................................................................................21
Input/Output (I/O) Controller (O)..........................................................................................22
82558 PCI LAN Controller (D).............................................................................................23
EtherExpress™PRO/100 WfM PCI LAN Subsystem...........................................................23
Alert On LAN Component....................................................................................................24
Audio Subsystem ................................................................................................................24
Audio Drivers and Utilities ...................................................................................................25
Hardware Monitor Subsystem.............................................................................................25
Power Supply......................................................................................................................26
Power Supply Considerations..............................................................................................26
Expansion ...........................................................................................................................27
Basic Input/Output System (BIOS)......................................................................................27
BIOS Upgrades...................................................................................................................27
BIOS Flash Memory Organization..............................................................................28
Piezoelectric Speaker (N)....................................................................................................28
2 Installation and Removal Procedures
Safety Considerations.........................................................................................................30
How to Install the DRM Fans and Processor Retention Mechanism....................................30
Materials Required......................................................................................................31
How to Install a Single Processor........................................................................................37
How to Install a Second Processor......................................................................................38
How to Remove and Install the Motherboard.......................................................................40
How to Set Processor Speed ..............................................................................................41
Jumper Settings..................................................................................................................42

MS440GX Motherboard Product Guide
iv
How to Remove a Processor...............................................................................................43
How to Upgrade a Processor ..............................................................................................44
How to Install the Termination Card ....................................................................................45
How to Remove the Termination Card ................................................................................46
How to Install Memory.........................................................................................................47
How to Remove Memory.....................................................................................................48
How to Replace the CR2032 Lithium Battery (M)................................................................49
How to Clear Passwords.....................................................................................................51
3 Using the BIOS Setup Program
Setup Program Modes ........................................................................................................54
Modes.................................................................................................................................54
Mode Control.......................................................................................................................54
Setup Program Menus ........................................................................................................55
Menu Functionality..............................................................................................................56
Menu Function Keys............................................................................................................56
Maintenance Menu..............................................................................................................57
Main Menu ..........................................................................................................................57
Advanced Menu ..................................................................................................................58
Peripheral Configuration Submenu......................................................................................59
IDE Configuration Submenus..............................................................................................60
Floppy Options Submenu....................................................................................................61
DMI Event Logging Submenu..............................................................................................62
Video Configuration Submenu.............................................................................................62
Security Menu.....................................................................................................................63
Power Menu........................................................................................................................63
Boot Menu...........................................................................................................................64
Boot Options .......................................................................................................................65
Hard Drive Submenu...........................................................................................................65
Removable Devices Submenu ............................................................................................66
Exit Menu............................................................................................................................66
4 Using the BIOS Features
How to Prepare for the Upgrade..........................................................................................68
Obtaining the BIOS Upgrade File........................................................................................68
Recording the Current BIOS Settings..................................................................................68
Creating a Bootable Floppy Disk.........................................................................................69
Creating the BIOS Upgrade Floppy Disk.............................................................................69
Upgrading the BIOS............................................................................................................70
Recovering the BIOS...........................................................................................................71
Changing the BIOS Language.............................................................................................72
Plug and Play: PCI Autoconfiguration.................................................................................72
ISA Plug and Play ...............................................................................................................73
ISA Legacy Devices............................................................................................................73
PCI IDE Support..................................................................................................................73
Desktop Management Interface (DMI).................................................................................74
Advanced Power Management (APM) ................................................................................74

Contents
v
Advanced Configuration and Power Interface (ACPI)..........................................................75
System States and Power States ...............................................................................75
Wake Up Devices and Events ....................................................................................76
Plug and Play .............................................................................................................76
BIOS Support .............................................................................................................76
Language Support...............................................................................................................76
OEM Logo or Scan Area.....................................................................................................76
USB Legacy Support...........................................................................................................77
BIOS Security Features.......................................................................................................77
Recovering BIOS Data........................................................................................................78
5 Technical Reference
Front Panel Connectors (L).................................................................................................80
Speaker...............................................................................................................................81
Reset Switch.......................................................................................................................81
Power/Sleep LED................................................................................................................82
Hard Drive Activity LED.......................................................................................................82
Infrared Port........................................................................................................................82
Power Switch ......................................................................................................................82
Front Panel Pin Connector Mapping....................................................................................83
Back Panel Connectors (E).................................................................................................84
Keyboard and Mouse Interface ...........................................................................................85
Universal Serial Bus (USB) .................................................................................................85
Parallel Port.........................................................................................................................86
Serial Ports..........................................................................................................................86
I/O Shield....................................................................................................................88
Midboard Connectors..........................................................................................................89
Add-in Card Connectors......................................................................................................90
Audio Connectors................................................................................................................91
CD-ROM Audio ...................................................................................................................92
Telephony ...........................................................................................................................92
Fan Connectors...................................................................................................................93
Thermal Considerations ......................................................................................................94
Power Connectors...............................................................................................................96
Peripheral Interface Connectors..........................................................................................99
Security and Hardware Management Connectors.............................................................100
Chassis Intrusion Connectors............................................................................................102
Wake on LAN Technology Connector ...............................................................................102
Wake on Modem...............................................................................................................102
Memory Map.....................................................................................................................103
DMA Channels..................................................................................................................103
I/O Map.............................................................................................................................104
PCI Configuration Space Map...........................................................................................106
LAN Subsystem Software..................................................................................................107
Interrupts...........................................................................................................................107
PCI Interrupt Routing Map.................................................................................................108
Interrupt Routing Example.................................................................................................109

MS440GX Motherboard Product Guide
vi
A Error Messages
BIOS Beep Codes.............................................................................................................112
BIOS Error Messages .......................................................................................................113
Port 80h POST Codes.......................................................................................................115
B Regulatory and Integration Information
Regulatory Compliance.....................................................................................................122
Product Certification Markings...........................................................................................122
Installation Precautions .....................................................................................................122
Installation Instructions......................................................................................................123
C Environmental Specifications and Reliability Information
Environmental Specifications ............................................................................................126
Reliability Information........................................................................................................126
D Specifications and Customer Support
Online Support..................................................................................................................128
Specifications....................................................................................................................128
Figures
1. MS440GX Main Board Components...........................................................................13
2. MS440GX Custom ATX Form Factor .........................................................................16
3. Procedure Step 2: DRM Stand...................................................................................31
3a. Procedure Step 3: DRM Stand With Fans ..................................................................31
3b. Procedure Step 5: Fan Positioning/Air Flow ...............................................................32
3c. Procedure Step 6: DRM Base With Retention Clip.....................................................32
3d. Procedure Step 7: Fans and Fan Header in Chassis..................................................33
3e. Procedure Step 11a: Installing the DRM.....................................................................33
3f. Procedure Step 13: CPU/Heat Sinks-DRM Tops........................................................34
3g. Procedure Step 14: DRM Tops, Clips, Holes..............................................................34
3h. Procedure Step 16: Processors Installed in the DRM.................................................35
3i. Procedure Step 17: Final DRM-Fan Assembly ...........................................................36
4. Installing a Single Processor ......................................................................................37
5. Installing a Second Processor ....................................................................................39
6. Motherboard Mounting Screw Holes...........................................................................40
7. Configuration Jumper Block........................................................................................42
8. Removing a Processor ...............................................................................................43
9. Installing the Termination Card...................................................................................45
10. Removing the Termination Card.................................................................................46
11. Installing a DIMM........................................................................................................48
12. Replacing the Battery.................................................................................................50
13. Setup Program Menu Structure..................................................................................55
14. Front Panel Connectors..............................................................................................80
15. Back Panel Connectors..............................................................................................84
16. Back Panel I/O Shield Dimensions (ATX Chassis-Independent).................................88
17. Add-in Card Connectors.............................................................................................90
18. Audio Connectors.......................................................................................................91
19. Fan Connectors..........................................................................................................93

Contents
vii
20. Thermally Sensitive Components...............................................................................94
21. Power Connectors......................................................................................................96
22. Peripheral Interface Connectors.................................................................................99
23. Security and Hardware Management Connectors ....................................................100
Tables
1. Motherboard Part-Function Table...............................................................................14
2. PCI/A.G.P. Controller Features ..................................................................................17
3. 82371EB Xcelerator Features ....................................................................................18
4. DIMM Sizes Supported...............................................................................................21
5. I/O Controller Components.........................................................................................22
6. LAN Controller Functions............................................................................................23
7. Audio Subsystem Resources......................................................................................25
8. Power Usage..............................................................................................................26
9. DC Voltage Tolerances and Estimated Current Requirements
(no PCI or A.G.P. shown)...........................................................................................26
10. Flash Memory Organization........................................................................................28
11. BIOS Setup Configuration Jumper Settings................................................................43
12. Setup Program Modes................................................................................................54
13. Jumper Settings .........................................................................................................54
14. Setup Menu Bar .........................................................................................................56
15. Setup Function Keys ..................................................................................................56
16. Maintenance Menu.....................................................................................................57
17. Main Menu..................................................................................................................57
18. Advanced Menu..........................................................................................................58
19. Peripheral Configuration Submenu.............................................................................59
20. IDE Configuration Submenus .....................................................................................60
21. Floppy Options Submenu...........................................................................................61
22. DMI Event Logging Submenu.....................................................................................62
23. Video Configuration Submenu....................................................................................62
24. Security Menu ............................................................................................................63
25. Power Menu...............................................................................................................63
26. Boot Menu..................................................................................................................64
27. Hard Drive Submenu..................................................................................................65
28. Removable Devices Submenu....................................................................................66
29. Exit Menu ...................................................................................................................66
30. Recommendations for Configuring an ATAPI Device..................................................73
31. Effects of Pressing the Power Switch.........................................................................75
32. Wake Up Devices and Events ....................................................................................76
33. Administrator and User Password Functions..............................................................78
34. Front Panel I/O Connectors........................................................................................81
35. Pin Connector Functionality........................................................................................83
36. PS/2 Keyboard/Mouse Connectors.............................................................................85
37. LAN Connector...........................................................................................................86
38. Audio Line In Connector.............................................................................................86
39. Audio Line Out Connector ..........................................................................................87
40. Audio Mic In Connector ..............................................................................................87

MS440GX Motherboard Product Guide
viii
41. Connector Groups......................................................................................................89
42. ATAPI-Style Telephony Connector(J1E1)...................................................................92
43. ATAPI CD Audio Connector (J2E1)............................................................................92
44. External Speaker Connector (J12A1).........................................................................92
45. MIDI/Joystick Connector (J2E2).................................................................................92
46. Fan Connectors..........................................................................................................94
47. Thermal Considerations for Components ...................................................................95
48. 1x6 Power Connector.................................................................................................97
49. Primary and Secondary Power Supply Connectors (J10H1).......................................97
50. VRM Connector (J13J1).............................................................................................98
51. SCSI LED Connector (J10A1) ....................................................................................99
52. Front and Rear Chassis Intrusion Connectors..........................................................101
53. Wake on LAN Technology Connector (J11A2) .........................................................101
54. Wake-on-Modem Connector (J9A1).........................................................................101
55. Memory Map ............................................................................................................103
56. DMA Channels .........................................................................................................103
57. I/O Map ....................................................................................................................104
58. PCI Configuration Space Map ..................................................................................106
59. Interrupts..................................................................................................................107
60. PCI Device Classes..................................................................................................108
61. PCI Interrupt Routing Map........................................................................................108
62. Beep Codes..............................................................................................................112
63. BIOS Error Messages...............................................................................................113
64. Port 80h Codes ........................................................................................................115
65. Safety Regulations ...................................................................................................122
66. EMC Regulations......................................................................................................122
67. Environmental Specifications....................................................................................126
68. Compliance with Specifications ................................................................................128

9
Acronyms
Acro. Meaning Acro. Meaning Acro. Meaning Acro. Meaning
ACPI Advanced
configuration
and power
interface
ECC Error checking
and correcting IRQ Interrupt request POST Power-on self test
ADPCM Adaptive
differential
pulse code
modulation
ECHS Extended
cylinder head
sector
LAN Local area
network SCI Special circumstance
instructions
A.G.P. Accelerated
graphics port ECP Extended capabilities
port
LBA Logical block
addressing S.E.C.C. Single edge contact
cartridge
APM Advanced
power
management
EMC Electromag-
netic
compatibility
LED Light emitting
diode SIR Surface insulation
resistance
BIOS Basic input /
output system EPP Enhanced parallel port MHz Megahertz SMI System management
interrupt
CMOS Complemen-
tary metal
oxide
semiconductor
ESCD Extended
system
configuration
data
MIF Management
information
format
SMM System
management
mode
CPU Central
processing
unit
ESD Electrostatic
DISCHARGE MIDI Musical interface
digital
interface
SMP Symmetric
multi-
processing
CSMA/CD Carrier sense
multiple
access with
collision
detection
FIFO First in, first
out MTBF Mean time between
failures
SRAM Static random
access
memory
DIMM Dual inline
memory
module
IDE Integrated
dual channel
enhanced
NIC Network
interface card UHCI Universal host controller
interface
DMA Direct memory
access I/O Input / output OEM Original equipment
manufacturer
USB Universal
serial bus
DMI Desktop
Management
Interface
IOAPIC Input Output
Advanced
Programmable
Input
Controller
OS Operating
System VID Voltage ID
DRAM Dynamic
random
access
memory
IPL Initial program
load PAC PCI A.G.P. controller VPD Vital product data
DRM Dual retention
mechanism ISA Industry standard
architecture
PCI Peripheral
component
interconnect
WfM Wired for
management

MS440GX Motherboard Product Guide
10

11
1 Motherboard Features
The MS440GX is designed specifically for the DCC, MCAD, and EDA markets with a high
performance workstation.
This chapter describes the features of the MS440GX motherboard. The chapter covers the
following topics:
Topic Page
Summary of Features 12
Board Layout 13
Motherboard Part-Function Table 14
Microprocessor 15
Processor Packaging 15
Second Level Cache 15
Processor Options 15
Form Factor 16
Chipset 16
PCI/A.G.P. Controller 17
82371EB Xcelerator 18
I/O Advanced Programmable Interrupt Controller 19
IDE Support 19
Real-Time Clock, CMOS SRAM, and Battery 20
Diskette Drive Controller 20
A.G.P. Support 21
Memory 21
I/O Controller 22
PCI LAN Controller 23
EtherExpress™ PRO/100 WfM PCI LAN Subsystem 23
Alert on LAN Component 24
Audio Subsystem 24
Audio Drivers and Utilities 25
Hardware Monitor Subsystem 25
Power Supply 26
Power Supply Considerations 26
Expansion 27
Basic Input/Output System (BIOS) 27
BIOS Upgrades 27
BIOS Flash Memory Organization 28
Piezoelectric Speaker 28

MS440GX Motherboard Product Guide
12
Summary of Features
The MS440GX motherboard features are summarized below.
Form factor Custom ATX (12 inches by 13 inches)
Processor(s) • Two Slot 2 connectors
• Support for one or two Pentium®II Xeon™processors
• 100 MHz host bus speed
• Up to 1 MB of L2 cache support on each processor
Chipset Intel®82440GX, consisting of:
• 82443GX PCI/A.G.P. controller (PAC)
• 82371EB PCI ISA IDE Xcelerator (PIIX4E)
Memory • Four DIMM sockets
• Support for up to 2 GB of 100 MHz SDRAM
• Support for ECC DIMMs only (see Table 4 and associated text)
I/O Control • National Semiconductor PC97307 I/O controller
Peripheral Interfaces • Two serial ports
• Two USB ports
• One parallel port
• Two IDE interfaces with Ultra DMA support
• One diskette drive interface
Video • One A.G.P. slot
Audio • Crystal Semiconductor CS4235 audio codec
• Crystal Semiconductor CS9236 wavetable synthesizer
LAN • Intel®82558 10/100 Mbps PCI LAN controller
Hardware Monitor • Microprocessor system hardware monitor (Analog Devices ADM9240 or
equivalent)
• Wired for Management (WfM) compliant
Expansion Capabilities • Five PCI slots
• One shared slot for either a PCI or an ISA add-in card
BIOS • Intel®E28F004BXT80 4 Mbit flash memory
• Support for SMBIOS, ACPI, APM, and Plug and Play

Motherboard Features
13
Board Layout
The illustration below is a picture of the MS440GX integrated motherboard. The main board
components are identified by alphabetical callouts.
This board supports the Slot 2 processor (DS2P) family. It is a custom ATX form factor (12”x13”)
board with an ATX I/O panel.
OM08377
E
A B C D
R
S
Q
O
N
P
F
G
H
J
K
I
ML
Figure 1. MS440GX Main Board Components

MS440GX Motherboard Product Guide
14
Motherboard Part-Function Table
This table identifies the motherboard components called out in Figure 1 and defines the functional
purpose of each.
Table 1. Motherboard Part-Function Table
Callout ID Part (Component) Function
A Intel E28F004BXT80 4 Mbit Flash
Memory Flash upgradable. Stores BIOS, Setup program, POST, APM, PCI auto configuration utility and
Plug and Play code
B Crystal Semiconductor CS4235 Audio
Codec On board audio subsystem with integrated FM synthesizer
C A.G.P. Connector High performance graphics connector with
support for 133 MHz data transfer rates (AGP2x)
D Intel 82558 PCI LAN Controller On board LAN controller with support for
10Base-T and 100Base-TX interfaces
E Back Panel Connectors Keyboard, mouse, USB, parallel, serial, LAN and
audio connectors
F Slot 2 Connector for Boot Processor Connector for Pentium II Xeon processor
G Slot 2 Connector for Application
Processor Connector for Pentium II Xeon processor
HIntel®82443GX (PAC) AGPset provides bus-control signals, address
paths and data paths for transfers between the
processor’s host bus, PCI bus, the A.G.P. and
main memory
I DIMM Sockets Support for up to 2GB PC100 compliant SDRAM
DIMMS
J Diskette Drive Connector Supports one or two diskette drives
K VRM Connector Plug-in Voltage Regulator Module for application
processor
L Front Panel Connectors Connectors for PC speaker, reset switch, power
LED, HDD LED, infrared port and power switch
M Battery Provides power to real-time clock and CMOS
memory
N Piezoelectric Speaker Provides BIOS beep codes
O National Semiconductor PC97307 I/O
Controller Provides serial and parallel ports, diskette drive, mouse, keyboard and IR interfaces
P IDE Connectors Each connector supports two IDE devices
Q 82371EB (PIIX4E) Provides USB and power management support
in addition to EIDE and UDMA/33 data transfer
rates
R PCI Bus Add-in Board Connectors Support for 33 MHz PCI devices
S ISA Bus Add-in Board Connector Support for ISA compatible add-in cards

Motherboard Features
15
Microprocessor
The Intel®MS440GX motherboard supports one or two Pentium II Xeon 400 or 450 MHz
processors, 100 MHz host bus speeds, and L2 caches up to 1MB in size. The processor’s VID pins
automatically program the voltage regulator on the motherboard to the required processor voltage
for the Boot (P0) Processor only.
A plug-in VRM must be used when adding an Application (P1) Processor. If a plug-in VRM is not
used, then the L2 cache will be disabled.
Processor Packaging
Each processor is packaged in a single edge contact cartridge (S.E.C.C.). The cartridge includes
the processor core, second-level cache, thermal plate, and back cover.
The processor connects to the motherboard through the Slot 2 connector, a 330-pin edge connector.
When mounted in a Slot 2 connector, the processor is secured by a retention mechanism attached
to the motherboard.
Second Level Cache
The second-level cache is located on the substrate of the S.E.C.C.. The ECC cache includes
components totaling up to 1 MB in size. All onboard system memory is cacheable.
Processor Options
The following processor configuration options can be used:
• A single 400 MHz processor installed in the boot processor slot (P0) and a terminator card
installed in the application processor slot (P1). P0 is the Slot 2 connector closest to the middle
of the board. See Figure 1 callouts F and G.
• Dual 400 MHz processors. When using two processors, a voltage regulator module (VRM)
must be installed.
• A single 450 MHz processor installed in the boot processor slot (P0) and a terminator card
installed in the application processor slot (P1).
• Dual 450 MHz processors. When using two processors, a voltage regulator module (VRM)
must be installed. See Figure 21, callout D for the location of the VRM connector.
If you are installing two processors, then the following values must be identical for both:
• L2 cache size
• Operating voltages
• Processor speed
CAUTION
If the processor operating voltages for either VCC core or VCC L2 do not match, then the computer
will not boot.
Use configure mode to set the processor speed if necessary.

MS440GX Motherboard Product Guide
16
Form Factor
The motherboard is designed to fit into a custom ATX form factor chassis.
The illustration below shows the board mounting hole locations. The mounting holes closest to the
Slot 2 connectors are used for mounting the processor retention mechanism to the board and
chassis.
OM07109
11.55
11.30
0.00
5.10
3.300.20
11.40
2.80
3.35
12.30
0.30
12.70
9.31
0.45
0.00
6.20
9.06
6.74
2.59
Figure 2. MS440GX Custom ATX Form Factor
Chipset
The Intel®440GX AGPset includes a Host-PCI bridge integrated with both an optimized DRAM
controller and an Accelerated Graphics Port (A.G.P.) interface.
The I/O subsystem of the 440GX is based on the PIIX4E which is a highly integrated PCI-ISA/IDE
Accelerator Bridge. This chipset consists of the Intel 82443GX PCI/A.G.P. controller (PAC) and
the Intel®82371EB PCI/ISA IDE Xcelerator (PIIX4E) bridge chip.

Motherboard Features
17
82443GX PCI/A.G.P. Controller (PAC) (H)
The Intel 82443GX PCI/A.G.P. Controller (PAC) provides the following functions:
• Bus-control signals
• Address paths
• Data paths for transfers between the processor’s host bus, PCI bus, the A.G.P., and main
memory.
Table 2 lists the PAC features and the functionality each feature supports.
Table 2. PCI/A.G.P. Controller Features
Feature Functionality
Processor Interface Control Support for processor host bus frequencies of 100 MHz only
32-bit addressing
Desktop optimized GTL + compliant host bus interface
Integrated DRAM Controller +3.3V only DIMM DRAM configurations
Up to four double sided DIMMs
100 MHz PC100-compatible Synchronous DRAM
DIMM serial presence detect via SMBus interface
2-, 4-, 8-, 16-, 32-, 64-, and 128-Mbit DRAM devices
SDRAM 64-bit data interface with ECC support
Symmetrical and asymmetrical DRAM addressing
A.G.P. Interface Complies with the A.G.P. specification Rev. 1.0
Support for +3.3V A.G.P. 66/133 MHz devices
Synchronous coupling to the host-bus frequency
PCI Bus Interface Complies with the PCI specification Rev. 2.1
Asynchronous coupling to the host-bus frequency
PCI parity generation support
Data streaming support from PCI-to-DRAM
Support for six PCI bus masters in addition to the host PCI-to-ISA
I/O bridge
Support for concurrent host, A.G.P., and PCI transactions to main
memory
Data Buffering DRAM write buffer with read-around-write capability
Dedicated host-to-DRAM, PCI0-to-DRAM, and PCI1/A.G.P.-to-DRAM
read buffers
A.G.P. dedicated inbound/outbound FIFOs (AGP2X), used for
temporary data storage
Power Management Functions Support for system suspend/resume and power-on suspend
Compliant with ACPI power management
SMBus Support for Desktop
Management Functions
Support for System Management
Mode (SMM)

MS440GX Motherboard Product Guide
18
Intel®82371EB Xcelerator (PIIX4E) (Q)
The Intel®PIIX4E is a multifunction PCI device implementing the PCI-to-ISA bridge, PCI IDE
functionality, Universal Serial Bus (USB) host/hub function, and enhanced power management.
Table 3 lists the PIIX4E features and the functionality each feature supports.
Table 3. 82371EB Xcelerator Features
Feature Functionality
Multifunction PCI-to-ISA Bridge Support for the PCI bus at 33 MHz
Complies with the PCI specification
Full ISA bus support
USB Controller Two USB ports
Support for legacy keyboard and mouse
Support for UHCI Design Guide, revision 1.1, interface
Integrated Dual Channel Enhanced IDE
Interface Support for up to four IDE devices
PIO Mode 4 transfers at up to 16 MB/sec
Support for Ultra DMA/33 synchronous DMA mode
transfers up to 33 MB/sec
Bus master mode with an 8x32-bit buffer for bus master
PCI IDE burst transfers
Enhanced DMA Controller Two 8237-based DMA controllers
Support for PCI DMA with three PC/PCI channels and
distributed DMA protocols
Fast type-F DMA for reduced PCI bus usage
Interrupt Controller Based on 82C59 Support for 15 interrupts
Programmable for edge/level sensitivity
Power Management Logic Sleep/resume logic
Support for Wake on Modem, Wake on LAN†
technology, and Wake on PME
Support for ACPI
System wakes from ACPI sleep state with keyboard
activity
Real-Time Clock 256-byte battery backed CMOS RAM
Includes date alarm
16-bit Counters/Timers Based on 82C54

Motherboard Features
19
Intel®82093AA I/O Advanced Programmable Interrupt
Controller (IOAPIC)
The Intel®82093AA I/O Advanced Programmable Interrupt Controller (IOAPIC) provides
interrupt management and incorporates both static and dynamic symmetric interrupt distribution
across all processors in a multiprocessor system. The 82093AA IOAPIC features 24 interrupts as
follows:
• 13 ISA interrupts
• Four PCI interrupts
• One Interrupt/SMI# rerouting
• Two motherboard interrupts
• One interrupt used for INTR input
• Three general purpose interrupts
• SCI BIOS supported steering
IDE Support
The motherboard has two independent bus-mastering IDE interfaces. These interfaces support PIO
Mode 3, PIO Mode 4, ATAPI devices (e.g., CD-ROM), and Ultra DMA synchronous-DMA mode
transfers. The BIOS supports logical block addressing (LBA) and extended cylinder head sector
(ECHS) translation modes. The BIOS automatically detects the IDE device transfer rate and
translation mode.
The motherboard supports LS-120 diskette technology through its IDE interfaces. LS-120 diskette
technology enables users to store 120 MB of data on a single, 3.5-inch removable diskette. LS-120
technology is backward compatible (both read and write) with 1.44 MB and 720 KB DOS-
formatted diskettes and is supported by Windows†95 and Windows NT†operating systems.
The motherboard allows connection of an LS-120 compatible drive and a standard 3.5-inch
diskette drive. If an LS-120 drive is connected to an IDE connector and configured as the A drive,
and a standard 3.5-inch diskette drive is configured as a B drive, the standard diskette drive must
be connected to the diskette drive cable's "A" connector (the connector at the end of the cable).
The LS-120 drive can be configured as a boot device, if selected in the BIOS setup utility.

MS440GX Motherboard Product Guide
20
Real-Time Clock, CMOS RAM, and Battery
The real-time clock provides a time-of-day clock and a multicentury calendar with alarm features
and century rollover.
The clock is compatible with DS1287 and MC146818 components and it supports 256 bytes of
battery-backed CMOS RAM in two banks that are reserved for BIOS use.
The time, date, and CMOS values can be specified in the Setup program. The CMOS values can
be returned to their defaults by using the Setup program.
An external coin-cell battery powers the real-time clock and CMOS memory. When the computer
is not plugged into a wall socket, then the battery has an estimated life of three years. When the
computer is plugged in, then the 3 V standby current from the power supply extends the life of the
battery.
✏NOTE
Power is supplied to the chassis intrusion circuit by the battery when no AC power is provided.
Chassis intrusion will be detected when no AC power is available to the system. If the switch is
activated when no AC power is provided, then the drain on the battery is approximately 200 mA.
The clock is accurate to ±13 minutes/year at 25 ºC with 5 V applied.
Diskette Drive Controller
The diskette drive controller is software compatible with the DP8473 and N82077 diskette drive
controllers and supports both PC-AT†and PS/2†modes. In the Setup program, the diskette drive
interface can be configured for the following diskette drive capacities and sizes:
• 360 KB, 5.25-inch
• 1.2 MB, 5.25-inch
• 720 KB, 3.5-inch
• 1.2 MB, 3.5-inch (driver required)
• 1.25/1.44 MB, 3.5-inch