American Megatrends MegaPro User manual

MegaPro
Dual Pentium® Pro
PCI ISA Motherboard
User's Guide
MAN–745
2/5/97

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guideii
© Copyright 1997 American Megatrends, Inc.
All rights reserved.
American Megatrends, Inc.
6145F Northbelt Parkway
Norcross, GA 30071
This publication contains proprietary information 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 only obligated to replace or refund the
purchase price of this product at American Megatrend'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
Intel, Pentium Pro, and Pentium are registered trademarks of Intel Corporation.
MS–DOS, Microsoft Word, and Microsoft are registered trademarks of Microsoft Corporation.
Windows 95, Microsoft Windows, and Windows NT 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.
Samsung is a registered trademark of Samsung Electronics Corporation.
Siemens is a trademark of Siemens Corporation.
Mitsubishi is a registered trademark of Mitsubishi Electronics of America.
Micron is a registered trademark of Micron Corporation.
SCO, Unix, and UnixWare are registered trademarks of the Santa Cruz Operation, Inc.
Toshiba is a registered trademark of Kabushiki Kaisha Toshiba.
All other brand and product names mentioned in this manual are trademarks or registered trademarks of
their respective companies.
Revision History
2/5/97 Initial release of preliminary version.

Preface iii
Preface
To the OEM
Thank you for purchasing the high performance American Megatrends
MegaPro Dual Pentium Pro PCI ISA 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 Megatrends MegaPro
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 MegaPro PCI motherboard. It explains
how to assemble a system based on the MegaPro 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.
Technical Support
If an American Megatrends motherboard fails to operate as described or
you are in doubt about a configuration option, please call technical
support at 770–246–8645.

Preface v
Packing List
You should have received the following:
• a MegaPro PCI motherboard,
• two serial cables,
• one parallel cable,
• one VGA cable,
• VGA driver diskettes for Windows 95 and Windows NT V3.5x,
• diskette containing the American Megatrends DMI Wizard
software utility and the Server Management Software for Windows
NT,
• a Warranty Card, and
• the American Megatrends MegaPro PCI Pentium Pro Motherboard
User's Guide.
Warning
Do not use 16 MB x 36 64 MB SIMMs that have 36 chips per
SIMM. This type of 16 MB SIMM does not work reliably because of
excessive loading on the motherboard circuitry. If you must use 64
MB SIMMs, use only SIMMs that have 12 or 8 chips per SIMM.
Seethe memory section for information about approved system
memory parts and vendors.
Do not use 70 ns SIMMs. The system memory timing cycle on this
motherboard are very sensitive. This motherboard does not work
reliably with 70 ns SIMMs.

Chapter 1 Hardware Installation 1
1Hardware Installation
Overview
The MegaPro motherboard features are:
• supports two Intel Pentium Pro CPUs operating at 133, 150, 166,
180, or 200 MHz,
• supports up to 512 MB of system memory,
• server management,
• onboard PCI VGA,
• parity checking or ECC Error Checking and Correction,
• PCI local bus throughput of 132 MBs,
• four ISA expansion slots, and
• four PCI expansion slots.
ISA DMA or Bus Masters
The MegaPro Pentium Pro PCI ISA motherboard conforms to the PCI
Version 2.1 specification, if the PCI 2.1 Compliance option in Chipset
Setup is set to Enabled. The Version 2.1 PCI specification requires a
deterministic latency for PCI devices. Computers that use ISA DMA or
ISA bus masters will experience longer access latencies if the PCI 2.1
Compliance Chipset Setup option is set to Enabled. AMIBIOS
automatically configures the PCI slots. The PCI slots are synchronous
with the CPU clock:
CPU External Clock Frequency PCI Expansion Slot Frequency
66 MHz 33 MHz
60 MHz 30 MHz
Onboard I/O The MegaPro motherboard includes:
• 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 VGA connector,
• a keyboard DIN connector, and
• a 9–pin berg mouse connector.

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide2
Server Management Software
The server management software for Windows NT only monitors the
following hardware parameters:
• CPU ambient temperatures,
• system voltage levels,
• CPU heat sink and chassis fan operation,
• chassis intrusion, and
• memory failure reporting if ECC is enabled.

Chapter 1 Hardware Installation 3
VGA Specification
The PCI VGA on the MegaPro motherboard is supported by the ATI 3D
RAGE II 264GT PCI Graphics Controller chip. The PCI VGA features are:
• 2 MB SGRAM. This RAM cannot be upgraded,
• a VGA cable is included, and
• video drivers for Windows 95 and Windows NT will be provided.
You can download video drivers for all other operating systems from
the ATI BBS at 905–764–9404.
Make sure you load the ATI 3D RAGE II drivers from the diskette
provided. Windows 95 auto detection tries to load the ATI Mach 64
drivers, which will not function properly.

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide4
MegaPro PCI Dimensions
The motherboard is approximately 12” by 13.75”.
Expansion
Slots
0.62"
Keyboard
Connectors
0.85"
SIMM
Sockets
1.5"CPUFanand
VoltageRegulators
2"
PowerConnectors
1.5"
13.75"
12"
Warning
This motherboard contains sensitive electronic
components that can be easily damaged by static
electricity. Follow the instructions carefully to ensure
correct installation and to avoid static damage.

Chapter 1 Hardware Installation 5
Step 1 Unpack the Motherboard
Step Action
1Inspect the cardboard carton for obvious damage. If
damaged, call 770–246–8645. 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 a 1 megaohm resistor instead of the anti–static
mat. Similarly, a strip of conductive aluminum foil wrapped
around the wrist and grounded through a 1 megaohm
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.

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide6
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 7
MegaPro Motherboard Layout
Pin1isidentifiedbyasquarepin
andbyapointedboxonthesilkscreen.
P10 Floppy
P8
PS/2
MOUSE
P9
KEBD
P2
P1
Megatrends
PCI SLOT 1 PCI SLOT 2
PCI SLOT 3
PCI SLOT4
BANK0BANK2
J14
J16 SPKR
P12Parallel
J12
1
2
J6
J13 IDELED
BIOS
Optional
ROM
P4SER1
P5
SER2
P13Secondary IDE
P11 Primary IDE
J17
J7
J23 KEYLOCK
J3
CPUFan
1
2
J4
1 2
P20 VGA
ConnectorP6P7
P3
BANK3
BANK1
ISA SLOT 1 ISA SLOT 2
ISA SLOT 3
ISA SLOT 4
J24
J15
J11
P14 USB1 P15USB2
1 2
J1
J2
CPUFan
J51
2
Megatrends
Me gatrend s
Megatrends
J8
J10J9
J19
J20
J29 J26
TLED J27 J28 Reset
J21 GrnPC J22
J18 Fan
Video ROM
RTC/CMOS ROM
J25
VRM2
VRM1

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide8
Step 2 Configure CPU
J7, J8, J9, J10, J17, and J24 select the CPU speed for the two CPUs. Both
CPUs are configured to the same speed. See the illustration on the
previous screen for the jumper locations.
CPU Speed If using two CPUs with different speed ratings, set the motherboard
jumpers to the lower CPU speed.
CPU
Speed J7 J8 J9 J10 J17 J24
133 MHz Open Short Open Short Short Pins 1–2,
Short Pins 3–4,
Short Pins 5–6,
Short Pins7–8
Short Pins 1–2
150 MHz Short Open Short Open Short Pins 3–4,
Short Pins 5–6,
Short Pins7–8
Short Pins 1–2
166 MHz Open Short Open Short Short Pins 3–4,
Short Pins 5–6,
Short Pins7–8
Short Pins 1–2
180 MHz Short Open Short Open Short Pins 1–2,
Short Pins 5–6,
Short Pins7–8
Short Pins 1–2
200 MHz Open Short Open Short Short Pins 1–2,
Short Pins 5–6,
Short Pins7–8
Short Pins 1–2
Important
Please contact American Megatrends technical
support at 770–246–8645 to support a CPU
running at a higher speed.
Cont’d

Chapter 1 Hardware Installation 9
Step 2 Configure CPU, Continued
CPU Voltage J4 and J5 set the CPU voltage.Each CPU can be independently set
to the correct CPU core voltage. The factory setting for both CPUs is
3.3V. It should not be changed unless the CPU is rated differently. J4
sets the CPU voltage for the CPU in U14. J5 sets the CPU voltage for the
CPU in U15. The CPU voltage settings:
Core CPU Voltage J4 and J5 Setting
3.5V Short Pins 1–2
Short Pins 3–4
Short Pins 5–6
Short Pins 7–8
3.4V Short Pins 1–2
Short Pins 3–4
Short Pins 5–6
3.3V Factory Setting Short Pins 1–2
Short Pins 3–4
Short Pins 7–8
3.2V Short Pins 1–2
Short Pins 3–4
3.1V Short Pins 1–2
Short Pins 5–6
Short Pins 7–8
3.0V Short Pins 1–2
Short Pins 5–6
2.9V Short Pins 1–2
Short Pins 7–8
2.8V Short Pins 1–2
2.7V Short Pins 3–4
Short Pins 5–6
Short Pins 7–8
2.6V Short Pins 3–4
Short Pins 5–6
2.5V Short Pins 3–4
Short Pins 7–8
2.4V Short Pins 3–4
2.3V Short Pins 5–6
Short Pins 7–8
2.2V Short Pins 5–6
2.1V Short Pins 7–8
No Voltage OPEN
Cont’d

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide10
Step 2 Configure CPU, Continued
Voltage Regulator
One Voltage Regulator Module is shipped with every MegaPro
motherboard. You need another VRM if you install two CPUs. Order
VRMs for Intel Pentium Pro CPUs from:
Manufacturer Part Number AMI Part
Number
VXI Electronics, Inc.
4607 SE International Way
Milwaukie OR 97222
503–652–7300 Fax:
503–786–5011
073–20674–
07X MDL–P6–V5A124
Connect CPU Fan
J3 and J2 are 3–pin bergs that connect the fan on the CPU heat sink to
motherboard power. J2 is the CPU fan connector for the CPU in U14. J3
is the CPU fan connector for the CPU in U15.
J2J3
+12V
Pin1
Ground
FanSense
+12V
Pin1
Ground
FanSense
All Pentium Pro CPUs are shipped with a heat sink and a CPU fan. The
connector from the CPU fan usually has three leads. The leads are
usually yellow, red, and black. Connect the Red lead to Pin 3 +12V.
Make sure that you use fans that have 3 leads. The yellow lead should
provide a tachometer output to permit the fan speed to be monitored
buy the onboard server management hardware. If you have to use fans
with only 2 leads, connect the red lead to Pin 3.
Warning
The red wire from the CPU fan must be connected to Pin 3.
Cont’d

Chapter 1 Hardware Installation 11
Step 2 Configure CPU, Continued
Install CPU
Install the CPU in the ZIF socket by performing the following steps.
The CPU sockets are near one edge of the motherboard.
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.
Step Action
1Lift the lever on the ZIF socket. The empty CPU socket
looks like this.
2Check for bent pins on the CPU. Gently straighten any
bent pins with pliers. Place the CPU in the middle of the
socket, as shown below. Make sure that pin 1 of the
CPU is aligned with pin 1 of the socket. Make sure you
are properly grounded while handling the CPU.

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide12
Step Action
3Complete installation by lifting the ZIF lever to the
other side of the socket, as shown below.
PentiumPro

Chapter 1 Hardware Installation 13
Step 3 Set Additional Jumpers
J1 and J6 Power
J1 and J6 select the 3.3V power source. J1 and J6 are 6–pin bergs. You
can provide 3.3V power either:
• through the voltage regulator which is the default source, or
• from a 3.3V power supply.
3.3V From Voltage Regulator
Set J1 and J6 as shown below to configure 3.3V power through the
voltage regulator.
Pin1
Pin6
2
34
5
J6
Pin1
Pin6
2
34
5
J1
3.3V from a 3.3V Power Supply
Set J1 and J6 as shown below to configure 3.3V power from a 3.3V
power supply.
Pin1
Pin6
2
34
5
J6
Pin1
Pin6
2
34
5
J1
Cont’d

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide14
Step 3 Set Additional Jumpers, Continued
J11 Testing J11 is a 2–pin berg used only for initial testing. Always leave J11 open.
Never place a jumper on J11.
J12 Chassis Door Open
J12 is a 2–pin berg that can be used to attach a wire to the chassis door
intrusion connector, if the chassis has this feature. The logic must be
set so that Pin 1 and Pin 2 are shorted when the chassis door is closed
and open when the chassis door is opened.
J14 SMI Select
J14 is a 3–pin berg that selects the SMI. Pins 1–2 should always be
shorted.
J18 Chassis Fan Connector
J18 is a 3–pin berg that provides +12V power to the main chassis fan.
The chassis fan should provide a tachometer output on Pin 1, so it can
be monitored by the onboard server management hardware. The pinout
is:
Pin Description
1Fan Sense
2Ground
3+12V
J19 Enable Onboard PCI VGA
J19 is a 2–pin berg that enables or disables the onboard PCI ATI VGA
controller. The J19 settings are:
Onboard PCI ATI VGA
Setting J19 Setting
PCI VGA Enabled OPEN Default
PCI VGA Disabled Shorted
J20 VGA Interrupt Enable
J20 is a 2–pin berg that enables interrupt support for the onboard PCI
ATI VGA controller:
Onboard PCI ATI VGA Interrupt Setting J20 Setting
PCI interrupt enabled for onboard PCI ATI VGA
Controller OPEN
PCI interrupt disabled for onboard PCI ATI VGA
Controller Shorted Default
Cont’d

Chapter 1 Hardware Installation 15
Step 3 Set Additional Jumpers, Continued
J22 Server Management SMI
J22 is a 2–pin berg that enables the server management SMI. The J22
settings are:
Server Management SMI Setting J22 Setting
Server management SMI is disabled. OPEN Default
Server management SMI is enabled. Shorted
J25 External SMI Switch
J25 is a 2–pin berg that can be connected to a switch to generate an
external SMI. The J25 settings are:
External SMI Switch Setting J22 Setting
External SMI is disabled. OPEN Default
External SMI is enabled. Shorted
J27 External 12C Module Connector
J27 is a 14–pin dual inline berg that connects to an external 12C module
that has advanced server management capabilities. J27 will be used in
the future to support Advanced Server Management. At present, do not
connect anything to J27.
J29 Erase Password
J29 is a 2–pin berg that can be used to erase the contents of CMOS
RAM, where all system configuration information is stored.
If you forget the AMIBIOS password, you can place a shorting bridge
on J29 for a few seconds to erase the old password and all system
configuration information. You must then reboot the computer, run
AMIBIOS Setup, and restore all system configuration information. The
J29 settings are:
CMOS Drain J29
Setting
Normal operation factory setting OPEN
The contents of CMOS RAM are destroyed. Shorted

MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide16
Step 4 Install Memory
System Memory
There are eight 32–bit SIMM sockets in 4 banks. System memory must
be populated one bank at a time. Each bank has two sockets. Bank0
includes U17 and U18. Bank1 includes U13 and U16. Bank2 includes U9
and U12. Bank3 includes U5 and U8. Up to 512 MB of system memory
can be installed on the motherboard. Each bank must be populated with
the same type of SIMM. If a 4 MB SIMM is installed in the first socket
in Bank0, then the same type of 4 MB SIMM must be installed in the
second Bank0 SIMM socket. The minimum amount of system memory
supported by the MegaPro PCI is 8 MB. Each socket can hold one
SIMM. Use:
• 1 MB x 32 or 36,
• 2 MB x 32 or 36,
• 4 MB x 32 or 36,
• 8 MB x 32 or 36, or
• 16 MB x 32 or 36 SIMMs.
Fast Page Mode, EDO, and Burst EDO SIMMs cannot be mixed. The
motherboard supports SIMMs operating at 50 or 60 ns RAS access
time.
Warning
Do not use 16 MB x 36 64 MB SIMMs that have 36 chips per SIMM.
This type of 16 MB SIMM does not work reliably because of
excessive loading on the motherboard circuitry. If you must use 64
MB SIMMs, use only SIMMs that have 12 or 8 chips per SIMM.
See the list of approved SIMMs.
Do not use 70 ns SIMMs. The system memory timing cycle on this
motherboard are very sensitive. This motherboard does not work
reliably with 70 ns SIMMs.
Memory DisplaySystem memory is reported by AMIBIOS as it boots and again when the
AMIBIOS System Configuration Screen is displayed just before the
operating system boots. The memory displayed by AMIBIOS on the
System Configuration Screen is 384 KB less than the total memory
installed. Cont’d