Intel LM440LX User Manual

LM440LX NLX Motherboard

Technical Product Specification

October 1997

Order Number 685521-001

The LM440LX NLX motherboard may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are documented in the LM440LX NLX Motherboard Specification Update.

Revision History

Revision Revision History Date

-001 First release of LM440LX Technical Product Specification. October 1997

This product specification applies only to standard LM440LX motherboards with BIOS identifier 4L4ML0X0.86A.

Changes to this specification will be published in the LM440LX 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 LM440LX motherboard may contain design defects or errors known as errata which may cause the product to deviate from

published specifications. 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.

‡

Wake on LAN is a trademark of IBM Corporation.

†

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, other Countries 708-296-9333.

1 Motherboard Description

1.1 Overview .....................................................................................................................7

1.2 Form Factor.................................................................................................................9

1.3 I/O Shield .................................................................................................................. 10

1.4 Microprocessor.......................................................................................................... 11

1.4.1 Microprocessor Packaging.......................................................................... 11

1.4.2 Second Level Cache................................................................................... 11

1.4.3 Microprocessor Upgrades........................................................................... 11

1.5 Memory ..................................................................................................................... 12

1.5.1 Main Memory.............................................................................................. 12

1.5.2 ECC Memory............................................................................................... 12

1.6 AGPset...................................................................................................................... 13

1.6.1 Intel 82443LX PCI/A.G.P. Controller (PAC)................................................ 13

1.6.2 Intel 82371AB PCI ISA IDE Xcelerator (PIIX4)........................................... 14

1.6.3 Accelerated Graphics Port (A.G.P.)............................................................ 15

1.6.4 Universal Serial Bus (USB)......................................................................... 16

1.6.5 IDE Support................................................................................................ 16

1.6.6 Real-time Clock, CMOS SRAM, and Battery............................................... 16

1.7 I/O Interface Controller.............................................................................................. 17

1.7.1 Serial Ports ................................................................................................. 17

1.7.2 Parallel Port ................................................................................................ 17

1.7.3 Floppy Controller......................................................................................... 17

1.7.4 PS/2 Keyboard and Mouse Interface.......................................................... 18

1.8 Audio Subsystem ...................................................................................................... 18

1.8.1 OPL3-SA3 Audio System............................................................................ 18

1.8.2 Audio Subsystem Resources...................................................................... 19

1.8.3 Audio Drivers and Utilities........................................................................... 19

1.8.4 Audio Connectors ....................................................................................... 20

1.9 Hardware Monitor...................................................................................................... 20

1.10 Motherboard Connectors........................................................................................... 21

1.11 Back Panel Connectors............................................................................................. 22

1.12 Configuration Jumpers.............................................................................................. 23

1.12.1 Mic In Select (J8H1) .................................................................................... 24

1.12.2 Normal Mode (J6C1)................................................................................... 24

1.12.3 Configuration Mode (J6C1)......................................................................... 24

1.12.4 Recovery Mode (J6C1)............................................................................... 24

1.13 NLX Card Edge Connectors...................................................................................... 25

1.13.1 NLX Riser with Supplemental Connector.................................................... 26

1.14 Reliability................................................................................................................... 27

1.15 Environmental ........................................................................................................... 27

1.16 Power Consumption.................................................................................................. 28

1.16.1 Power Supply Considerations..................................................................... 28

1.17 Regulatory Compliance............................................................................................. 29

1.17.1 Product Certification Markings .................................................................... 29

iii

Contents

2 Motherboard Resources

2.1 Memory Map ............................................................................................................. 31

2.2 DMA Channels.......................................................................................................... 31

2.3 I/O Map ..................................................................................................................... 32

2.4 PCI Configuration Space Map................................................................................... 34

2.5 Interrupts...................................................................................................................34

2.6 PCI Interrupt Routing Map......................................................................................... 34

3 Overview of BIOS Features

3.1 Introduction ............................................................................................................... 37

3.2 BIOS Upgrades......................................................................................................... 37

3.3 BIOS Flash Memory Organization............................................................................. 38

3.4 Plug and Play: PCI Autoconfiguration...................................................................... 38

3.5 PCI IDE Support........................................................................................................ 38

3.6 ISA Plug and Play..................................................................................................... 39

3.7 ISA Legacy Devices.................................................................................................. 39

3.8 Desktop Management Interface (DMI) ...................................................................... 40

3.9 Advanced Power Management (APM)...................................................................... 40

3.10 Language Support..................................................................................................... 41

3.11 Boot Options ............................................................................................................. 41

3.12 OEM Logo or Scan Area........................................................................................... 41

3.13 USB Legacy Support................................................................................................. 42

3.14 BIOS Setup Access................................................................................................... 43

3.15 Recovering BIOS Data.............................................................................................. 43

4 BIOS Setup Program

4.1 Maintenance Menu.................................................................................................... 45

4.2 Main Menu ................................................................................................................ 46

4.2.1 Floppy Options Submenu ........................................................................... 47

4.2.2 IDE Device Configuration Submenus.......................................................... 48

4.3 Advanced Menu........................................................................................................ 49

4.3.1 Resource Configuration Submenu.............................................................. 50

4.3.2 Peripheral Configuration Submenu............................................................. 50

4.3.3 Keyboard Configuration Submenu.............................................................. 52

4.3.4 Video Configuration Submenu.................................................................... 52

4.3.5 DMI Event Logging Submenu..................................................................... 52

4.4 Security Menu ........................................................................................................... 53

4.5 Power Menu.............................................................................................................. 53

4.6 Boot Menu................................................................................................................. 54

4.6.1 Hard Drive Submenu................................................................................... 55

4.6.2 Removable Devices Submenu.................................................................... 55

4.7 Exit Menu.................................................................................................................. 55

5 Error Messages and Beep Codes

5.1 BIOS Error Messages................................................................................................ 57

5.2 Port 80h POST Codes............................................................................................... 58

5.3 BIOS Beep Codes..................................................................................................... 63

6 Specifications and Customer Support

6.1 Online Support.......................................................................................................... 65

6.2 Specifications............................................................................................................ 65

Figures

1. Motherboard Components........................................................................................... 8

2. Motherboard Dimensions ............................................................................................ 9

3. Back Panel I/O Shield Dimensions ............................................................................ 10

4. Motherboard Connectors........................................................................................... 21

5. Back Panel I/O Connectors....................................................................................... 22

6. Jumper Locations...................................................................................................... 23

Tables

1. Supported Drivers and Resolutions........................................................................... 15

2. Audio Subsystem Resources .................................................................................... 19

3. Fan connector (J3A1)................................................................................................ 21

4. Jumper Settings ........................................................................................................ 23

5. Signals, NLX Riser with Supplemental Connector (P9J1)......................................... 26

6. Motherboard Environmental Specifications............................................................... 27

7. Power Usage............................................................................................................. 28

8. Safety Regulations.................................................................................................... 29

9. EMI Regulations........................................................................................................ 29

10. Memory Map ............................................................................................................. 31

11. DMA Channels.......................................................................................................... 31

12. I/O Map ..................................................................................................................... 32

13. PCI Configuration Space Map................................................................................... 34

14. Interrupts...................................................................................................................34

15. PCI Interrupt Routing Map......................................................................................... 35

16. Flash Memory Organization ...................................................................................... 38

17. Recommendations for Configuring an ATAPI Device................................................ 39

18. Setup Menu Bar........................................................................................................ 45

19. Setup Function Keys................................................................................................. 45

20. Maintenance Menu.................................................................................................... 46

21. Main Menu ................................................................................................................ 46

22. Floppy Options Submenu.......................................................................................... 47

23. IDE Device Configuration Submenus........................................................................ 48

24. Advanced Menu........................................................................................................ 49

25. Resource Configuration Submenu ............................................................................ 50

Contents

26. Peripheral Configuration Submenu ........................................................................... 51

27. Keyboard Configuration Submenu............................................................................ 52

28. Video Configuration Submenu .................................................................................. 52

29. DMI Event Logging Submenu ................................................................................... 52

30. Security Menu ........................................................................................................... 53

31. Power Menu.............................................................................................................. 53

32. Boot Menu................................................................................................................. 54

33. Hard Drive Submenu................................................................................................. 55

34. Removable Devices Submenu.................................................................................. 55

35. Exit Menu.................................................................................................................. 55

36. BIOS Error Messages ............................................................................................... 57

37. Port 80h Codes......................................................................................................... 58

38. Beep Codes .............................................................................................................. 63

39. Compliance with Specifications................................................................................. 65

1 Motherboard Description

1.1 Overview

The LM440LX motherboard supports Pentium® II family microprocessors operating at 233, 266, and 300 MHz. The motherboard features:

• NLX form factor

• Minimal jumper design

Main Memory

• Two 168-pin DIMM sockets

• Support for up to 256 MB of synchronous DRAM (SDRAM)

• Support for 66 MHz SDRAM

AGPset and PCI Interface

• Intel 82440LX AGPset PCI/A.G.P Controller (PAC)

• Integrated PCI bus mastering controller using PIIX4

I/O Features

• SMC FDC37C677 I/O controller integrates standard I/O functions: floppy drive interface, one

multi-mode parallel port, two FIFO serial ports, real-time clock, and keyboard and mouse controller

• Support for two Universal Serial Bus (USB) ports

• Dual channel Fast IDE interface

Audio Subsystem

• Yamaha OPL3-SA3 audio codec component Graphics Subsystem

• Cirrus Logic CL-GD5465 A.G.P. graphics accelerator with 4 MB of (RDRAM) RAMBUS

video memory

Other features

• Plug and Play compatible

• Support for Advanced Configuration and Power Interface (ACPI) and Advanced Power

Management (APM)

Software drivers and utilities are available from Intel.

†

Motherboard Description

Figure 1 shows the general location of the components on the motherboard.

R Q

B C

D E

H I

L KN

A Back panel connectors J NLX riser edge connector B Supplemental edge connector K National Semiconductor LM79 hardware monitor C SMC FDC37C677 I/O controller L Slot 1 connector D Microphone input select jumper M Fan connector E Yamaha OPL3-SA3 audio codec N Intel 82443LX PCI/A.G.P. controller

F Flash memory O DIMM sockets

G Intel 82371AB PCI ISA IDE Xcelerator (PIIX4) P Cirrus Logic CL-GD5465 A.G.P. graphics

accelerator

H Configuration jumper Q Battery

I Speaker R RAMBUS memory

OM06340a

Figure 1. Motherboard Components

LM440LX NLX Motherboard Technical Product Specification

1.2 Form Factor

The motherboard is designed to fit into a standard NLX form factor chassis. Figure 2 illustrates the mechanical form factor for the motherboard. Location of the I/O connectors, riser connector, and mounting holes is in strict compliance with the NLX I/O Shield Design Suggestions specification (see Section 6.2).

6.05

9.80

8.70

6.225

0.20

0.00

0.45

0.00

3.40

Figure 2. Motherboard Dimensions

7.80

7.34

OM06337a

Motherboard Description

1.3 I/O Shield

The back panel I/O shield for the motherboard must meet specific dimensional and material requirements. Computers built with this motherboard need the I/O shield to pass EMI certification testing. Figure 3 shows the critical dimensions for the I/O shield and indicates the position of each cutout. For more chassis design requirements, see the NLX specification (see Section 6.2).

0.530

0.948

0.456

0.00

1.175

0.570

0.168

0.456

0.366(2) 0.490(2)

0.00

1.838

2.504

3.179

0.543

0.208

4.532

4.637

5.997

Figure 3. Back Panel I/O Shield Dimensions

7.274

7.429

7.908

1.752

1.197

0.447

0.143

8.853

OM06463

LM440LX NLX Motherboard Technical Product Specification

1.4 Microprocessor

The motherboard supports a single Pentium II processor. The processor’s VID pins automatically program the motherboard’s voltage regulator to the required processor voltage. The motherboard operates with processors that run internally at 233, 266, or 300 MHz and run externally at 66 MHz host bus speed with either a 256 KB or 512 KB second-level cache.

The processor implements MMX technology and maintains full backward compatibility with the 8086, 80286, Intel386, Intel486, and Pentium processor. The processor’s numeric coprocessor significantly increases the speed of floating-point operations and complies with ANSI/IEEE standard 754-1985.

1.4.1 Microprocessor Packaging

The processor is packaged in a Single Edge Contact (S.E.C.) cartridge. The S.E.C. cartridge includes the processor core, the second-level cache, a thermal plate, and a back cover.

The processor connects to the motherboard through the Slot 1 processor connector, a 242-pin edge connector. When mounted in Slot 1, the processor is secured by a retention mechanism attached to the motherboard. The processor’s heatsink is stabilized by a heatsink support that is attached to the motherboard.

1.4.2 Second Level Cache

The second-level cache is located on the substrate of the S.E.C. cartridge. The cache includes burst pipelined synchronous static RAM (BSRAM) and tag RAM. There can be two or four BSRAM components totaling 256 KB or 512 KB in size. All supported onboard memory can be cached.

1.4.3 Microprocessor Upgrades

The motherboard can be upgraded with Pentium II processors that run at higher processor speeds. When upgrading the processor, use the BIOS configuration mode to change the processor. See Section 1.12.3 for information about configuration mode.

Motherboard Description

1.5 Memory

1.5.1 Main Memory

The motherboard has two dual inline memory module (DIMM) sockets. Minimum memory size is 16 MB; maximum memory size is 256 MB. The BIOS automatically detects memory type, size, and speed.

The motherboard supports the following memory features:

• 168-pin DIMMs with gold-plated contacts

• 66 MHz SDRAM only

• Non-ECC (64-bit) and ECC (72-bit) memory

• 3.3 V memory only

• Single- or double-sided DIMMs in the following sizes:

DIMM Size Non-ECC Configuration ECC Configuration

16 MB 2 Mbit x 64 2 Mbit x 72 32 MB 4 Mbit x 64 4 Mbit x 72 64 MB 8 Mbit x 64 8 Mbit x 72 128 MB 16 Mbit x 64 16 Mbit x 72

Memory can be installed in one or two sockets. Memory size can vary between sockets.

NOTE

✏

To function properly, SDRAM DIMMs must meet the Intel 4-clock, 66 MHz, unbuffered SDRAM specification for either 64-bit or 72-bit SDRAM. See Section 6.2 for information about these specifications.

1.5.2 ECC Memory

Error checking and correcting (ECC) memory detects multiple-bit errors and corrects single-bit errors. When ECC memory is installed, the BIOS supports both ECC and non-ECC mode. ECC mode is enabled in the Setup program. The BIOS automatically detects if ECC memory is installed and provides the Setup option for selecting ECC mode. If any non-ECC memory is installed, the Setup option for ECC mode does not appear.

The following table describes the effect of using Setup to put each memory type in each supported mode. Whenever ECC mode is selected in Setup, some performance loss occurs.

Memory Error Detection Mode Established in Setup Program

ECC Disabled ECC Enabled Non-ECC DIMM ECC DIMM

No error detection N/A

No error detection Single-bit error correction, multiple-bit error

detection

LM440LX NLX Motherboard Technical Product Specification

1.6 AGPset

The Intel 440LX AGPset is designed for the Pentium II processor. It consists of the Intel 82443LX PCI/A.G.P. controller (PAC) and the Intel 82371AB PCI/ISA IDE Xcelerator (PIIX4) bridge chip.

1.6.1 Intel 82443LX PCI/A.G.P. Controller (PAC)

The PAC provides bus-control signals, address paths, and data paths for transfers between the processor’s host bus, PCI bus, Accelerated Graphics Port (A.G.P.), and main memory. The PAC features:

• Processor interface control  Processor host bus speed of 66 MHz  32-bit addressing  GTL+ compliant host bus

• Integrated DRAM controller  Supports synchronous DRAM (SDRAM)  64/72-bit path-to-memory  Auto detection of memory type  Supports 4-, 16-, 64-Mbit DRAM devices  Symmetrical and asymmetrical DRAM addressing  Supports 3.3 V DRAMs

• Accelerated Graphics Port Interface  Complies with A.G.P. specification (see Section 6.2 for specification information)  Supports 3.3 V A.G.P. devices with data transfer rates up to 66 MHz  Synchronous coupling to the host-bus frequency

• Fully-synchronous PCI bus interface  Complies with PCI specification (see Section 6.2 for specification information)  PCI-to-DRAM access greater than 100 MB/sec  Supports five PCI bus masters in addition to the host and PCI-to-ISA I/O bridge  Delayed transactions  PCI parity checking and generation support

• Data Buffering  Host-to-DRAM, PCI-to-DRAM, and A.G.P.-to-DRAM write-data buffering  Write-combining for host-to-PCI burst writes  Supports concurrent host, PCI, and A.G.P. transactions to main memory

• Supports system management mode (SMM)

Motherboard Description

1.6.2 Intel 82371AB PCI ISA IDE Xcelerator (PIIX4)

The PIIX4 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. The PIIX4 features:

• Multifunction PCI-to-ISA bridge  Supports the PCI bus at 33 MHz  Complies with PCI specification (see Section 6.2 for specification information)  Full ISA or extended I/O (EIO) bus support

• USB controller  Two USB ports (see Section 6.2 for compliance level)  Supports legacy keyboard and mouse  Supports universal host controller interface (UHCI) design guide revision 1.1 interface

• Integrated dual-channel enhanced IDE interface  Supports up to four IDE devices  PIO Mode 4 transfers at up to 14 MB/sec  Supports Ultra DMA/33 synchronous DMA mode transfers up to 33 MB/sec  Bus master mode with an 8 x 32-bit buffer for bus master PCI IDE burst transfers

• Enhanced DMA controller  Two 8237-based DMA controllers  Supports 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  Supports 15 interrupts  Programmable for edge/level sensitivity

• Power management logic  Sleep/resume logic  Supports thermal alarm  Supports wake-on-modem through Ring Indicate input  Supports Wake on LAN

• Real-time Clock  256 byte battery-backed CMOS SRAM  Includes date alarm

• 16-bit counters/timers based on 82C54

‡

LM440LX NLX Motherboard Technical Product Specification

1.6.3 Accelerated Graphics Port (A.G.P.)

A.G.P. is a high-performance interconnect for graphic-intensive applications, such as 3D applications. A.G.P. is independent of the PCI bus and is intended for exclusive use with graphical-display devices. A.G.P. provides these performance features:

• Pipelined-memory read and write operations that hide memory access latency

• Demultiplexing of address and data on the bus for near 100% bus efficiency

• AC timing for 66 MHz data transfer rates, allowing data throughput of 250 MB/sec

A.G.P. complies with the 66 MHz PCI specification. See Section 6.2 for information about the A.G.P. and PCI specifications.

1.6.3.1 Cirrus Logic CL-GD5465 A.G.P. graphics accelerator

The CL-GD5465 supports A.G.P. for higher bandwidth between the system memory and the graphics subsystem. It is a member of the Laguna family of RAMBUS-based graphics accelerators, offering 3D-graphics capability while maintaining a high level of 2D performance. The features include:

• 64-bit graphics engine with integrated 3D game acceleration

• High-performance 64-bit GUI accelerator

• Video playback acceleration

†

• Integrated VGA

• Integrated 230-MHz palette DAC and clock synthesizer

controller

Table 1. Supported Drivers and Resolutions

8 bit

Drivers

Microsoft Windows Microsoft DCI* Provider Microsoft Windows 95 Microsoft DirectDraw AutoCAD AutoShade with Renderman 3D Studio MicroStation Microsoft Windows NT OS/2† v3.x, Warp

VPM** Resolution-independent

* Display control interface ** Video port manager *** Microsoft Windows NT only

†

256 colors

640 x 480 800 x 600 1024 x 768 1280 x 1024 1600 x 1200

640 x 480 800 x 600 1024 x 768 1280 x 1024

16 bit 65,536 colors

640 x 480 800 x 600 1024 x 768 1280 x 1024

640 x 480 800 x 600 1024 x 768

24 bit 16,777,216 colors

640 x 480 800 x 600 1024 x 768

32 bit 16,777,216 colors

640 x 480*** 800 x 600*** 1024 x 768***

Motherboard Description

1.6.4 Universal Serial Bus (USB)

The motherboard has two USB ports. The motherboard fully supports the universal host controller interface (UHCI) and uses UHCI-compatible software drivers. See Section 6.2 for information about the USB specification. USB features include:

• Self-identifying peripherals that can be plugged in while the computer is running

• Automatic mapping of function to driver and configuration

• Isochronous and asynchronous transfer types supported over the same set of wires

• Up to 127 physical devices supported

• Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other

applications

• Error-handling and fault-recovery mechanisms built into the protocol

NOTE

✏

Computer systems that have an unshielded cable attached to a USB port may not meet FCC Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use shielded cable that meets the requirements for full-speed devices.

1.6.5 IDE Support

The motherboard has two independent bus-mastering PCI IDE interfaces. These interfaces support PIO Mode 3, PIO Mode 4, ATAPI devices (e.g., CD-ROM), and Ultra DMA/33 synchronousDMA mode transfers. The IDE interface signals are routed to the NLX riser connector.

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.

Programmed I/O operations usually require a substantial amount of processor bandwidth. However, in multitasking operating systems, the bandwidth freed by bus mastering IDE can be devoted to other tasks while disk transfers are occurring.

1.6.6 Real-time Clock, CMOS SRAM, and Battery

The real-time clock is compatible with DS1287 and MC146818 components. The clock provides a time-of-day clock and a multi-century calendar with alarm features and century rollover. The realtime clock supports 256 bytes of battery-backed CMOS SRAM 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, the battery has an estimated life of three years. When the computer is plugged in, the 3 V standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with 5 V applied.

LM440LX NLX Motherboard Technical Product Specification

1.7 I/O Interface Controller

The motherboard uses the SMC FDC37C677 I/O controller which features:

• ISA Plug-and-Play compatible register set

• Two serial ports

• FIFO support on both serial and floppy interfaces

• One parallel port with ECP and EPP support

†

• PS/2

• Supports BIOS setup for various configuration options

1.7.1 Serial Ports

The motherboard has two 9-pin D-Sub serial port connectors located on the back panel. The NS16C550-compatible UARTs support data transfers at speeds up to 115.2 Kbits/sec with BIOS support.

1.7.2 Parallel Port

The connector for the multimode bidirectional parallel port is a 25-pin D-Sub connector located on the back panel of the motherboard. In the Setup program, there are four options for parallel port operation:

• Compatible (standard mode)

• Bidirectional (PS/2 compatible)

• Bidirectional Enhanced Parallel Port (EPP). A driver from the peripheral manufacturer is

• Bidirectional high-speed Extended Capabilities Port (ECP)

style mouse and keyboard interfaces

required for operation. See Section 6.2 for EPP compatibility.

1.7.3 Floppy Controller

The I/O controller is software compatible with the DP8473 and 82077 floppy drive controllers. In the Setup program, the floppy interface can be configured for the following floppy 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 (Mode 3 floppy support, driver required)

• 1.25/1.44 MB, 3.5-inch

• 2.88 MB, 3.5-inch

• 120 MB (LS-120)

The floppy disk interface signals are routed to the NLX riser connector.

Motherboard Description

1.7.4 PS/2 Keyboard and Mouse Interface

PS/2 keyboard and mouse connectors are located on the back panel of the motherboard. The +5 V lines to these connectors are protected with a PolySwitch reestablishes the connection after an over-current condition is removed. While this device eliminates the possibility of having to replace a fuse, power to the computer should be turned off before connecting or disconnecting a keyboard or mouse.

NOTE

✏

You can plug the mouse and keyboard into either PS/2 connector.

The keyboard controller contains code which provides the traditional keyboard and mouse control functions, and also supports Power On/Reset password protection. A Power On/Reset password can be specified in the Setup program.

The keyboard controller also supports the hot-key sequence <Ctrl><Alt><Del>, software reset. This key sequence resets the computer’s software by jumping to the beginning of the BIOS code and running the Power On Self Test (POST).

†

circuit that, like a self-healing fuse,

1.8 Audio Subsystem

1.8.1 OPL3-SA3 Audio System

The onboard audio subsystem features the Yamaha OPL3-SA3 (YMF715) device. The features of the device include:

• A 16-bit audio codec

• OPL3 FM synthesis

• An integrated 3D enhanced stereo controller

• Support for MPU-401

• Stereo analog-to-digital and digital-to-analog converters

• Analog mixing, anti-aliasing, and reconstruction filters

• 16-bit address decoding supported

• Line, microphone, and monaural inputs

• ADPCM, A-law, or µlaw digital audio compression and decompression

• Full digital control of all mixer and volume control functions

• Microphone input (Mic In) connector is jumper selectable between the back panel and the riser

• Plug and Play compatible

†

• Sound Blaster Pro

and Microsoft Windows Sound System compatible

LM440LX NLX Motherboard Technical Product Specification

1.8.2 Audio Subsystem Resources

The following table shows the IRQ, DMA channel, and base I/O address options for the audio subsystem. Options are listed in order of preference specified by Yamaha. These options are automatically chosen by the Plug and Play interface, so there are no default settings. Onboard audio can be enabled or disabled in the Setup program.

Table 2. Audio Subsystem Resources

Resource

Sound Blaster (DMA playback, DMA shared with Windows Sound System capture)

Windows Sound System (DMA playback)

MPU-401 (IRQ shared with Sound Blaster)

†

AdLib

†

IRQ (Options)

5, 7, 10, 11

(5 is recommended) 5, 7, 10, 11 0, 1, 3 530-537h

DMA channel (Options)

0, 1, 3 220-22Fh

I/O Address (Options)

240-24Fh 16 bytes on 16-byte

boundary in the range of 220-280h

E80-E87h 8 bytes on 8-byte

boundary in the range of 530-F48h

330-331h 300-301h 2 bytes on 2-byte

boundary in the range of 300-334h

388-38Dh 6 bytes on 8-byte

boundary in the range of 388-3F8h

1.8.3 Audio Drivers and Utilities

Audio software and utilities are available from Intel’s World Wide Web site (see Section 6.2). Audio driver support is provided for the Microsoft Windows 3.1, Microsoft Windows 95, Microsoft Windows NT operating systems.

(versions 3.51 and 4.0), and IBM OS/2 Warp (versions 3.0 and 4.0)

Motherboard Description

1.8.4 Audio Connectors

The back panel includes the following audio connectors:

• Line Out

• Mic In

1.9 Hardware Monitor

The optional hardware monitor component (National Semiconductor LM79) provides low-cost instrumentation capabilities designed to reduce the total cost of owning a PC when used with LANDesk include:

• An integrated ambient temperature sensor

• Fan speed sensors

• Power supply voltage monitoring to detect levels above or below acceptable values

• Remote reset capabilities from a remote peer or server through LANDesk Client Manager,

Client Manager. The hardware implementation is a single-chip ASIC. Features

Version 3.0 and service layers (when available)

When suggested ratings for temperature, fan speed, or voltage are exceeded, an interrupt is activated. The hardware monitor component (LM79) connects to the system management bus. For more information on the LM79, see http://www.national.com.

+ 46 hidden pages