American Megatrends Merlin DP Dual Processor S750 User guide

Brand: American Megatrends

Model: Merlin DP Dual Processor S750

Category: Motherboards

Type: User guide

Merlin DP

Dual Pentium® Pro

PCI ISA Motherboard

User's Guide

MAN – 750

12/10/96

Merlin DP PCI Motherboard User’s Guide

American Megatrends, Inc.

5555 Oakbrook Parkway, Building 200,

Norcross, GA 30093

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

VESA is a registered trademark of the Video Electronics Standards Association.

Intel and Pentium are registered trademarks of Intel Corporation.

MS – DOS, Microsoft Word, and Microsoft are registered 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.

VESA and DPMS are trademarks of Video Electronics Standards Association.

All other brand and product names are trademarks or registered trademarks of their respective companies.

Revision History

9/25/96 Initial release of preliminary version.

10/22/96 Corrected minor errors in manual.

12/10/96 Added new AMIBIOS Setup options.

Preface

To the OEM

Thank you for purchasing the high performance American Megatrends Merlin

DP 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 Merlin DP 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 Merlin DP PCI motherboard. It explains how to assemble a

system based on the Merlin DP 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.

Merlin DP PCI Motherboard User’s Guide

American Megatrends BBS

The American Megatrends BBS permits OEMs, VARs, and system integrators

to access technical information about motherboard and BIOS products.

Product Engineering Change Notices, Tech Tips, Technical Notes, and

complete technical manuals are available.

Data Transmission Rates

The American Megatrends BBS automatically handles modems with data

transmission rates from 1,200 to 28,800 bps.

BBS Phone Numbers

The following table lists the characteristics of the BBS phone numbers. The

BBS requires no parity, eight data bits, and one stop bit.

Phone Number Characteristics

770 – 246 – 8780 28,800 baud rate. Supports v.34.

770 – 246 – 8781 28,800 baud rate. Supports v.34.

770 – 246 – 8782 Supports HST and v.42.

770 – 246 – 8783 Supports HST and v.42.

Packing List

You should have received the following:

• a Merlin DP PCI motherboard,

• two serial cables,

• one parallel cable,

• a Warranty Card, and

• the American Megatrends Merlin DP PCI Pentium Pro Motherboard User's

Guide.

Chapter 1 Hardware Installation

1 Hardware Installation

Overview

The American Megatrends Merlin DP PCI Pentium Pro ISA motherboard

features include:

• supports two Intel Pentium Pro CPUs operating at 133, 150, 166, 180, or 200

MHz,

• supports up to 512 MB of system memory,

• parity checking or ECC (Error Checking and Correction),

• PCI local bus throughput of 132 megabytes per second,

• three ISA expansion slots, and

• four PCI expansion slots.

ISA DMA or Bus Masters

The Merlin DP 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 FrequencyPCI Expansion Slot Frequency

66 MHz 33 MHz

60 MHz 30 MHz

50 MHz 25 MHz

Onboard I/O

The Merlin DP 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 keyboard DIN connector, and

• a 9 – pin berg mouse connector.

Merlin DP PCI Motherboard User’s Guide

Merlin DP PCI Dimensions

The motherboard is approximately 8.55” by 13”.

Expansion

Slots

0.62"

Keyboard

Connectors

0.85"

SIMM

Sockets

1.5" CPU Fan and

Voltage Regulators

Power Connectors

1.5"

13"

8.55"

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

Merlin DP PCI Motherboard Layout

J1 Floppy

PS/2 MOUSE

J11

KEBD

Megatrends

J22

PCI SLOT 1

PCI SLOT 2

PCI SLOT 3

PCI SLOT 4

BANK0 BANK1

RTC/

Battery

J31

CPU

Fan

Pin 1 is identified by a square pin

and by a pointed box on the silkscreen.

J30

J14 USB2 J13 USB1

J2 Parallel

J32

J33

J35 SPKR

Megatrends

J26

J20

J16

Alarm

BIOS

Optional

ROM

J8 SER1

J9 SER2

J10 Secondary IDE

J12 Primary IDE

J23

J17

J29 J34

J36 KEYLOCK

CPU

Fan

Merlin DP PCI Motherboard User’s Guide

Step 1 Unpack the Motherboard

Step Action

1 Inspect the cardboard carton for obvious damage. If

damaged, call 770 – 246 – 8645. Leave the motherboard in

its original packing.

2 Perform 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 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.

3 Inside 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.

4 Inspect 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.

5 If 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

Step 2 Configure CPU

J16, J17, J26, and J22 select the CPU speeds and voltages for the two CPUs.

Both CPUs are configured to the same speed.

CPU Speed

If using two CPUs with different speed ratings, set the motherboard jumpers to

the lower CPU speed.

CPU Speed J22 J16 J17 J26

150 MHz Short Pins 1 – 2 Open Shorted Short Pins 3 – 4

Short Pins 5 – 6

Short Pins 7 – 8

166 MHz Short Pins 1 – 2 Shorted Open Short Pins3 – 4

Short Pins 5 – 6

Short Pins 7 – 8

180 MHz Short Pins 1 – 2 Open Shorted Short Pins 1 – 2

Short Pins 5 – 6

Short Pins 7 – 8

200 MHz Short Pins 1 – 2 Shorted Open Short Pins 1 – 2

Short Pins 5 – 6

Short Pins 7 – 8

Important

Please contact American Megatrends technical

support at 770 – 246 – 8645 to support a CPU

running at a higher speed.

Cont’d

Merlin DP PCI Motherboard User’s Guide

Step 2 Configure CPU, Continued

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. J6 sets the CPU voltage for the CPU in U13. J4 sets the CPU

voltage for the CPU in U12.

Core CPU Voltage J6 and J7 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

Chapter 1 Hardware Installation

Step 2 Configure CPU, Continued

Voltage Regulator

One Voltage Regulator Module is shipped with every Merlin DP motherboard.

You need another VRM if you install two CPUs. You can 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 J5 (shown below) are two – pin bergs that connect the fan on the CPU

heat sink to the motherboard power. J5 is the CPU fan connector for the CPU in

socket U13. J3 is the CPU fan connector for the CPU in socket U12.

+12V

Pin 1

GND

+12V

Pin 1

GND

All Pentium Pro CPUs are shipped with a heat sink and a CPU fan. The wire

from the CPU fan has two leads. The fan cable has a red lead and a black lead.

Connect the Red lead to +12V.

Warning

The red wire from the CPU fan must be connected to Pin 1 of J3

and J5.

Cont’d

Merlin DP PCI Motherboard User’s Guide

Step 2 Configure CPU, Continued

Install CPU

Install the CPU in the ZIF (zero insertion force) socket by performing the

following steps. The CPU socket is 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 prescribed antistatic procedures.

Step Action

1 Lift the lever on the ZIF socket. The empty CPU socket looks like this.

2 Check 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.

Chapter 1 Hardware Installation

Step Action

3 Complete installation by lifting the ZIF lever to the other side of the

socket, as shown below.

Merlin DP PCI Motherboard User’s Guide

Step 3 Install Memory

System Memory

Four 32 – bit SIMM sockets are on this motherboard.

System memory must be populated one bank at a time. Each bank has two

sockets.

Bank0 includes U11 and U14. Bank1 includes U8 and U9.

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 Merlin DP PCI is 8 MB. Each socket can hold

one SIMM. You can 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),

• 16 MB x 32 (or 36), or

• 32 MB x 32 (or 36) SIMMs.

The Merlin DP motherboard will support 128 MB SIMMs when they become

available, permitting up to 512 MB of system memory to be installed on the

motherboard.

Fast Page Mode, EDO, and Burst EDO SIMMs cannot be mixed. The

motherboard supports SIMMs operating at 50, 60, or 70 ns RAS access time.

Set the Chipset Setup DRAM Speed option correctly.

Memory Display

System 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

Chapter 1 Hardware Installation

Step 3 Install Memory, Continued

Select SIMMs

SIMMs must meet the following specifications:

Parameter Specification

Page Mode FAST

Refresh CAS before RAS

CAC

≤ 20 ns

RAC

≤ 80 ns

≤ 45 ns

70 ns

CPA

≤ 45 ns

SIMM Part Numbers

Type Manufacturer Part Number

1 MB x 36 Micron MT12D136M – 7

“ Mitsubishi MH1M36ADJ – 7

“ PNY P361000 – 70

“ Motorola MCM36100AS – 70

“ Oki MSC2355 – 70YS12

“ Samsung KMM5361000AV – 7

2 MB x 36 PNY P362000 – 70

“ Samsung EMM53620036 – 70

4 MB x 36 Micron MT12D436M – 7

“ Mitsubishi MH4M36SAJ – 7

“ Motorola MCM36400S – 70

“ PNY P364000 – 70

“ Samsung KMM5364100 – 7

8 MB x 36 Motorola MCM36800S – 70

“ PNY P368000 – 707

“ Samsung KMM5368100 – 7

16 MB x 36 Samsung KMM53616000AKG – 6

Installing SIMMs

The four SIMM sockets on the motherboard can be filled with either 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. Place the motherboard on an anti – static mat. With the component

side of the SIMM facing you, firmly push the SIMM into the socket at an

angle, then push it up. When properly inserted, the SIMM clicks into place as

the latching pins engage.

Merlin DP PCI Motherboard User’s Guide

Step 4 Install the Motherboard

The motherboard mounting hole pattern is the same as the mounting hole

pattern on the standard baby AT motherboard. Standoffs and mounting screws

are not supplied with the motherboard. The chassis manufacturer should

supply these parts.

Step Action

1 Place 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.

2 Rotate 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.

3 Hold the motherboard, component – side up, with the edge

with the SIMM sockets toward you and the edge with the

power supply connector away from you. The keyboard,

mouse, and video connectors should be to the left.

4 Carefully 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.

5 Place 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.

Chapter 1 Hardware Installation

Step 5 Attach Cables

Connectors

The Merlin DP PCI motherboard includes many connectors. Connection

instructions, illustrations of connectors, and pinouts are supplied in the

following screens.

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.

Connect Power Supply

The power supply should match the physical configuration of the chassis.

Make sure the power switch is off 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 250 watt power supply, which should

have built – in filters to suppress radiated emissions.

Connect Power Cables

Attach the power supply cables to the power connector (P1 and P2) on the

motherboard. AT – compatible power supplies have two six – pin connectors,

attached as shown below. The six – pin connector on the power cable with

three red wires and two black wires is attached to P2. The other connector on

the end of the power cable is attached to P1.

Cont’d

Merlin DP PCI Motherboard User’s Guide

Step 5 Attach Cables, Continued

Power Connector Keys

The power connectors are keyed to prevent incorrect installation. The keys on

the connector must be cut to fit on some power supplies, as shown below.

Pin 1

P1 Pinout

Pin Description

1 Power Good (Orange wire) (Not used)

2 VCC (Red wire)

3 +12 Volts (Yellow wire)

4 – 12 Volts (Blue wire)

5 Ground (Black wire)

6 Ground (Black wire)

P2 Pinout

Pin Description

1 Ground (Black wire)

2 Ground (Black wire)

3 – 5 Volts (White wire)

4 VCC (Red wire)

5 VCC (Red wire)

6 VCC (Red wire)

Cont’d

Chapter 1 Hardware Installation

Step 5 Attach Cables, Continued

J11 Keyboard Connector

The keyboard connector is a 6 – pin DIN socket. The pinout is shown below.

Pin Assignments

1 Keyboard clock

2 Keyboard data

3, 6 Not used

4 Ground

5 VCC

Connect Mouse Cable

The mouse connector (J7 ) is a 10 – pin berg. The mouse cable is the same as

the serial cable in the motherboard. Two serial cables are shipped with the

motherboard. Use one of these cables for the mouse, or make your own cable.

The pinout is:

Pin Description Pin Description

1 Mouse Clock 2 N/C

3 N/C 4 N/C

5 N/C 6 VCC

7 N/C 8 Mouse Data

9 Ground 10 N/C

PS/2 Mouse IRQ

J23 is a three – pin berg that enables the PS/2 mouse interrupt (IRQ12). Short

Pins 1 – 2 of J23 to enable IRQ12 as the PS/2 mouse interrupt. You should

always short Pins 1 – 2 of J23 to enable the PS/2 mouse interrupt. The only

reason you would ever have to short Pins 2 – 3 of J23 is if you wanted an

adapter card on the ISA bus to use IRQ12. You would then have to set the

Mouse Support option in Advanced Setup to Disabled.

J23 Pins 1-2 Shorted

IRQ12 used for PS/2 Mouse

Cont’d

Merlin DP PCI Motherboard User’s Guide

Step 5 Attach Cables, Continued

J29 Green PC Power

J29 is a two – pin berg that connects to a Green PC power supply. When the

computer enters a power conserving state, a signal is sent from this berg to the

power supply to permit the power supply to switch to a low power, high –

efficiency mode. The + on Pin 2 identifies the positive connector.

J32 Reset Switch Connector

J32 is a two – pin single – inline berg that is attached via a cable to an

externally – mounted reset switch. When the reset switch is pressed, the

system performs a hard reset. Pin 1 is ground and Pin 2 is Hard Reset.

J35 Speaker Connector

J35 is a four – pin single – inline berg that is optionally attached via a cable to a

standard system speaker. AMIBIOS signals hardware problems through the

speaker. Pin 1 on the motherboard is identified by the arrow on the white box

around the berg. The Merlin DP PCI motherboard also has a built – in speaker

mounted on the motherboard.

Pin Description

1 Data Out

2 Key

3 N/C

4 VCC

Cont’d

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American Megatrends Merlin DP Dual Processor S750 User guide

Brand: American Megatrends

Model: Merlin DP Dual Processor S750

Category: Motherboards

Type: User guide

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American Megatrends Merlin DP Dual Processor S750 User guide

American Megatrends Merlin DP Dual Processor S750 User guide

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