American Megatrends MegaDual User manual

MegaDual
Pentium II®/Pentium III®
PCI Motherboard
User's Guide
MAN-798
3/15/00

MegaDual PCI Motherboard User’s Guideii
© Copyright 2000 American Megatrends, Inc.
All rights reserved.
American Megatrends, Inc.
6145F Northbelt Parkway
Norcross, GA 30071
This publication contains proprietaryinformation which is protected by copyright. No part of this publication may be reproduced, transcribed, stored
in a retrieval system, translated into any language or computer language, or transmitted in any form whatsoever without the prior written consent of the
publisher, American Megatrends, Inc.
Limited Warranty
Buyer agrees if this product proves to be defective, that American Megatrends, Inc. is obligated only to replace or refund the purchase price of this
product at AmericanMegatrend's discretion according to the terms and conditions on the motherboard warranty card. American Megatrends shall not
be liable in tort or contract for any loss or damage, direct, incidental or consequential. Please see the Warranty Registration Card shipped with this
product for full warranty details.
Limitations of Liability
In no event shall American Megatrends be held liable for any loss, expenses, or damages of any kind whatsoever, whether direct, indirect, incidental, or
consequential, arising from the design or use of this product or the support materials provided with the product.
Trademarks
VESA is a registered trademark of the Video Electronics Standards Association.
Intel, Pentium. Pentium Pro, and Pentium II/Pentium III are registered trademarks of Intel Corporation.
MS-DOS, Microsoft Word, and Microsoft are registered trademarks of Microsoft Corporation. Microsoft Windows,
Windows NT, and Windows 95 are trademarks of Microsoft Corporation.
IBM, AT, XT, CGA, VGA, PS/2, OS/2, and EGA are registered trademarks of International Business Machines Corporation.
Fujitsu is a registered trademark of Fujitsu America, Inc.
Motorola is a registered trademark of Motorola Corporation.
Hitachi is a registered trademark of Hitachi America, Ltd.
PNY is a registered trademark of PNY Corporation.
Oki is a registered trademark of Oki America, Inc.
NEC is a registered trademark of NEC Corporation.
Micron is a registered trademark of Micron Corporation.
SCO, Unix, and UnixWare are registered trademarks of the Santa Cruz Operation, Inc.
All other brand and product names are trademarks or registered trademarks of their respective companies.
Revision History
3/15/00 Initial release.

Preface iii
Table of Contents
1Hardware Installation..................................1
Overview.....................................................................................1
MegaDual PCI Motherboard Layout.....................................3
Step 1 Unpack the Motherboard ............................................4
Avoid Static Electricity.............................................................4
Step 2 Configure CPU Speed...................................................5
Step 3 Install Additional Voltage Regulator..........................6
Step 4 Connect CPU Fans........................................................7
Step 5 Install CPU......................................................................8
Step 6 Install Memory...............................................................9
Step 7 Install the Motherboard .............................................11
Step 8 Attach Cables ..............................................................12
Step 9 Connect I/O..................................................................19
Step 10 Set Options on the QLogic Menu...........................31
Step 11 Connect SCSI I/O......................................................48
Step 12 Install Drivers.............................................................53
Step 13 Test and Configure ...................................................54
2AMIBIOS Setup............................................55
AMIBIOS Setup Menu...........................................................56
Section 1 Main Setup........................................................................57
Section 2 Advanced CMOS Setup..................................................58
Section 3 Chipset Setup...................................................................77
Section 4 PCI/PnP Setup.................................................................79
Section 5 Power Management Setup.............................................83
Power Management................................................................84
Section 6 Boot Setup.........................................................................87
Section 7 Security Setup.................................................................91
AMIBIOS Password Support................................................91
Security Setup..........................................................................92
Section 8 Exit Menu..........................................................................95
3Programming Flash ROM.........................97
Bootblock Code Checkpoint Codes ...................................103
4Deleting a Password...............................105
ASpecifications............................................107
Engineering Specifications..................................................107
BCable Information.....................................109
Index........................................................................111

MegaDual PCI Motherboard User’s Guideiv
Preface
To the OEM Thank you for purchasing the high performance American MegatrendsMegaDual
Pentium II/Pentium III PCI motherboard. This product is a state of the art motherboard that
includes the famous AMIBIOS. It is assumed that you have also licensed the rights to use
the American Megatrends documentation for the American MegatrendsMegaDual
motherboard.
This manual was written for the OEM to assist in the proper installation and operation of
this motherboard. This manual describes the specifications and features of the MegaDual
PCI motherboard. It explains how to assemble a system based on the MegaDual PCI
motherboard and how to use the AMIBIOS that is specifically designed for this
motherboard.
This manual is not meant to be read by the computer owner who purchases a computer
with this motherboard. It is assumed that you, the computer manufacturer, will use this
manual as a sourcebook of information, and that parts of this manual will be included in
the computer owner's manual.
Disclaimer
AMI certifies only that this product will work correctly when this
product is used with the same jumper settings, the same system
configuration, the same memory module parts, and the same
peripherals that were tested by AMI with this product. The complete
list of tested jumper settings, system configurations, peripheral
devices, and memory modules are documented in the AMI
Compatibility Report for this product. Call your AMI sales
representative for a copy of the Compatibility Report for this product.

Preface v
Technical Support
AMI provides technical support only for AMI products purchased directly from AMI or
from an AMI-authorized reseller.
If… Then…
You purchased this product from AMI or
from a certified AMI reseller, Call AMI technical support at 770-246- 8600. Please be prepared to specify the
serial number of the product.
This AMI product was installed as part of a
system manufactured by a company other
than AMI or you purchased an AMI
product from an unauthorized reseller,
Call the technical support department of
the computer manufacturer or the
unauthorized reseller. AMI does not
provide direct technical support in this
case.
If an American Megatrends motherboard fails to operate as described or you are in doubt
about a configuration option, please call technical support at 770-246-8600.
Web Site We invite you to access the American Megatrends world wide web site at:
http://www.ami.com.

MegaDual PCI Motherboard User’s Guidevi
Packing List
You should have received the following:
•a MegaDual Pentium II/Pentium III PCI motherboard
•one CD containing drivers for the QLogic SCSI controller, and the Intel 82559 LAN
controller
•one CD containing the AMI ASM (AMI Server Manager) server management
program. Please refer to the ASM manual for information on how to use this program.
•one termination card
•two VRM modules
•two retention mechanisms for the Pentium II/Pentium III CPUs
•Warranty Card
•the American Megatrends MegaDual Pentium II/ Pentium IIIPCI Motherboard
User's Guide

Chapter 1 Hardware Installation 1
1Hardware Installation
Overview
The American MegatrendsMegaDual Pentium II/III features include:
•support for two Intel Pentium II/Pentium III CPUs
•support for all Pentium II/Pentium III frequencies
•up to 4 GB of onboard ECC SDRAM system memory
•system memory parity checking or ECC (Error Checking and Correction)
•PCI local bus throughput of 132 MB/s for 32-bit at 33 MHz, and 512MB/s for 64-bit at
66 MHz
•onboard dual channel 160M SCSI controller
•the ASM server management software
•four 32-bit, 33 MHz PCI expansion slots
•two 64-bit, 66 MHz PCI expansion slots
•an AGP PRO 4x connector
•10/100 MB onboard LAN
Warning – Danger of Battery Shorting
In PCI Slot #4 (J11), some adapter cards with larger Ground brackets may short
out the battery. This is not a problem with most PCI adapter cards. If there is a
problem with the PCI adapter card, the battery may drain and a CMOS error may
occur. Please make sure that the bracket mounting screws do not touch the
battery terminal when inserting PCI adapter cards in PCI Slot #4 (J11). If the
screws touch the battery terminal, install the PCI adapter card in a different
PCI Slot.
CPUs This motherboard supports all Intel Slot1 CPUs. CPU speed can be set in the AMIBIOS
setup.
Note: Boxed CPUs come with pre-set clock speed ratios. For these CPUs, there is no BIOS
option to configure CPU speed.
Cont’d

MegaDual PCI Motherboard User’s Guide2
Overview, Continued
PCI Bus Speed AMIBIOS automatically configures the PCI slots. The PCI slots are synchronous with the
CPU clock:
CPU External Clock
Frequency PCI Expansion Slot Frequency
100 MHz 33 MHz for 32-bit, 66 MHz for 64-bit
133 MHz 33 MHz for 32-bit, 66 MHz for 64-bit
Onboard I/O The MegaDual motherboard includes:
•one onboard Qlogic 12160 dual 160M SCSI controller
•two 40-pin IDE connectors for 1 – 4 IDE drives
•a 34-pin floppy drive connector
•two serial port connectors
•a 25-pin parallel port connector
•a keyboard and PS/2 mouse dual mini
•two 4-pin USB ports on dual combo
•onboard 82559 10/100 Mb LAN

Chapter 1 Hardware Installation 3
MegaDual PCI Motherboard Layout

MegaDual PCI Motherboard User’s Guide4
Step 1 Unpack the Motherboard
Step Action
1Inspect the cardboard carton for obvious damage. If damaged,
call 770-246-8600. Leave the motherboard in its original packing.
2Perform all unpacking and installation procedures on a ground-
connected anti-static mat. Wear an anti-static wristband
grounded at the same point as the anti-static mat. Or use a sheet
of conductive aluminum foil grounded through a1 megohm
resistor instead of the anti-static mat.Similarly, a strip of
conductive aluminum foil wrapped around the wrist and
grounded through a 1 megohm resistor serves the same purpose
as the wristband.
3Inside the carton, the motherboard is packed in an anti-static bag,
and sandwiched between sheets of sponge. Remove the sponge
and the anti-static bag. Place the motherboard on a grounded
anti-static surface component side up. Save the original packing
material.
4Inspect the motherboard for damage. Press down on all ICs
mounted in sockets to verify proper seating. Do not apply power
to the motherboard if it has been damaged.
5If the motherboard is undamaged, it is ready to be installed.
Set Jumpers Set all jumpers and install the CPU before placing the motherboard in the chassis.
Avoid Static Electricity
Static electricity can damage the motherboard and other computer components. Keep the
motherboard in the anti-static bag until it is to be installed. Wear an anti-static wrist
grounding strap before handling the motherboard. Make sure you stand on an anti-static
mat when handling the motherboard.
Avoid contact with any component or connector on any adapter card, printed circuit
board, or memory module. Handle these components by the mounting bracket.

Chapter 1 Hardware Installation 5
Step 2 Configure CPU Speed
If you use two CPUs with different speed ratings, put the settings to the lower CPU speed.
CPU speed is controlled by the BIOS setup. See the description in the Chapter 2
AMIBIOS setup for more information.
Please contact American Megatrends technical support at 770-246-8600 to support a CPU
running at other speeds.
Caution
Both CPU slots must be fully populated at all times. If you
use only one CPU, install the termination card in the
second CPU location.
If the board is powered up with one empty CPU slot, the
CPU LED (located at D3 on board graphic on page 3) will
light up and the board will stay in RESET mode.

MegaDual PCI Motherboard User’s Guide6
Step 3 Install Additional Voltage Regulator
Two Voltage Regulator Modules (VRMs)are shipped with every MegaDual motherboard.
Each installed CPU requires its own VRM. Even if you use only one CPU, you can install
both VRMs on the motherboard.
Caution
Do not power up the MegaDual board if there is a CPU
installed without a corresponding VRM.

Chapter 1 Hardware Installation 7
Step 4 Connect CPU Fans
JP13 and JP14 (shown below) are 3-pin bergs that connect the fan on the CPU heat sink to
the motherboard power. JP13 is the CPU0 fan connector for the CPU in location U13. JP14
is the CPU1 fan connector for the CPU in location U15.
All Pentium II/Pentium III CPUs are shipped witha heat sink, and a CPU fan.
The connector from the CPU fan usually has three leads:
•the black lead represents ground
•the red lead represents +12V
•the yellow lead represents tachometer output
JP15 System Fan JP15 is a 3-pin berg. The pinout is the same for JP15 as it is for JP13 and JP14. The chassis
fan should provide a tachometer output on Pin 3 so it can be monitored by the onboard
server management hardware.

MegaDual PCI Motherboard User’s Guide8
Step 5 Install CPU
MegaDual supports Intel Pentium II/Pentium III SECC2 CPUs. MegaDual has two slot 1
connectors that can house these CPUs.
Warning
Improper CPU installation can damage the CPU and the
motherboard. You must follow the procedures in this
section exactly as documented. Make sure you wear an
antistatic wristband while installing the CPU. Follow
all antistatic procedures described on page 4.
Termination CardThe MegaDual motherboard is shipped with a termination card that should be installed in
the empty CPU slot if only one CPU is installed.
You must install the termination card in the empty CPU slot if installing only one Pentium
II/Pentium III CPU. The motherboard will not power up unless both CPU slots are
occupied. If both CPU slots are not occupied, the CPU LED D3 will come on.

Chapter 1 Hardware Installation 9
Step 6 Install Memory
System Memory There are four 72-bit SDRAM DIMM (Dual Inline Memory Module) sockets. System
memory must be populated one bank at a time. Each bank contains two sockets. Bank0
contains DIMM sockets U17 and U19. Bank1 contains U18 and U20.
The minimum amount of system memory supported by the MegaDual PCI is 16 MB. Each
socket can hold one DIMM. You can use:
•1 MB x 64 (or 72)
•2 MB x 64 (or 72)
•4 MB x 64 (or 72)
•8 MB x 64 (or 72)
•16 MB x 64 (or 72)
•32 MB x 64 (or 72)
•64 MB x 64 (or 72)
•128 MB x 64 (or 72)
Memory must be installed one bank at a time. The two modules in a bank must be exactly
the same.
MegaDual supports up to 4 GB of system memory using PC-100 unbuffered DIMMs. Both
registered and non-registeredDIMMs are supported. Cont’d

MegaDual PCI Motherboard User’s Guide10
Step 6 Install Memory, Continued
Installing DIMMs Place the motherboard on an anti-static mat. With the component side of the DIMM
facing you, firmly push the DIMM into the socket at an angle, then push it up. When
properly inserted, the DIMM clicks into place as the latching pins engage. The DIMM
installation process is shown below:

Chapter 1 Hardware Installation 11
Step 7 Install the Motherboard
Step Action
1Place the chassis on an anti-static mat. Connect the chassis to
ground to avoid static damage during installation. Connect an
alligator clip with a wire lead to any unpainted part of the chassis.
Ground the other end of the lead at the same point as the mat and
the wristband.
2Rotate the chassis so the front is to the right, and the rear is to
the left. The side facing you is where the motherboard is
mounted. The power supply is mounted at the far end of the
chassis.
3Carefully slide the motherboard into the chassis. Make certain the
edge connectors fit the ports in the rear of the chassis. The
motherboard should rest level with the chassis.
4Place the mounting screws in the holes provided and tighten
them. If necessary, shift the motherboard slightly to align the
mounting holes on the motherboard with the holes on the
chassis,
Warning
If using metallic screws, make sure you use them only in
the plated mounting holes.
If using metallic screws, make sure the head of the screw
fits completely inside the plated mounting holes.

MegaDual PCI Motherboard User’s Guide12
Step 8 Attach Cables
Connectors The MegaDual PCI motherboard includes many connectors. Connection instructions,
illustrations of connectors, andpinouts are supplied in the following pages. A list of all
connectors follows:
Connector turn to
CPU0 fan JP13 page 7
CPU1 fan JP14 page 7
External battery connector JP4 page 13
Power supply connectors J4, J5 page 14
Drain CMOS RAM power JP3 page 15
Boot block pgm JP5 page 15
IDE LED JP10 page 16
PS/2 keyboard and mouse combination
J1 page 16
Chassis intrusion JP12 page 16
SCSI LED JP17 page 16
Clock spread enable JP16 page 17
Hardware reset switch JP6 page 17
Speaker JP9 page 17
Keyboard lock connector J12 page 17
USB/RJ45 connector J2 page 18
Power-on switch JP2 page 18
Safe mode boot option JP1 page 18
Parallel port connector J3A page 20
Serial port connectors J3B S1 and S2 page 21
Floppy connector JP11 page 22
IDE primary connector JP7 page 25
IDE secondary connector JP8 page 28
MegaRAC Port J10 page 30
SCSI channel 1 J15 page 48
SCSI channel 2 J16 page 48
Cont’d

Chapter 1 Hardware Installation 13
Step 8 Attach Cables,Continued
Cable Connector Ends When connecting chassis connectors to the motherboard, make sure to connect the
correct connector end. Most connector wires are color-coded. Match the color of the
wires leaving the switch or LED to the same pin on the connector end. There may be more
than one connector with the same color-coded wires. If so, follow the wire to the switch or
LED. All motherboard components are outlined by a white rectangular box with a broad
arrow at one end. Pin 1 is always at the arrow end of the white outlined box, as shown
below:
External Battery Connector JP4JP4 is the connector to the external battery.
The pinout is:
Pin Assignments
1External battery positive terminal
2N/C
3Ground
4Ground
Cont’d

MegaDual PCI Motherboard User’s Guide14
Step 8 Attach Cables, Continued
Connect Power SupplyThe power supply should match the physical configuration of the chassis. Make
sure the power switch isOff before assembly.
Before attaching all components, make sure the proper voltage has been selected. Power
supplies often can run on a wide range of voltages and must be set (usually via a switch)
to the proper range. Use at least a 300-watt ATX power supply, which should have built-
in filters to suppress radiated emissions. Power supply voltage depends upon system
load. For example, +12V rating should be matched to the amount of the external load (SCSI,
IDE, or hard disks.)
Attach the cables from the power supply to the power connector(s) on the motherboard.
ATX-compatible power supplies can have either one or two 20-pin connectors. You can
use either one or both power connectors.
You can connect the ATX power supply to either J4 or J5 on the motherboard, or you can
use both connectors if there are two power cables from the ATX power supply.
The power connector pinout is:
Pin Description Pin Description
11 +3.3V 1+3.3V
12 -12V 2+3.3V
13 Ground 3Ground
14 PSON 4+5V (VCC)
15 Ground 5Ground
16 Ground 6+5V (VCC)
17 Ground 7Ground
18 -5V 8POWER GOOD
19 +5V 95VSB
20 +5V 10 +12V
Cont’d