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MegaRUM
Dual Pentium® II
PCI ISA Motherboard
User's Guide
MAN-758
6/5/97
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© Copyright 1985-2010 American Megatrends, Inc. All rights reserved. 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 W
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Preface To the OEM Thank you for purchasing the high performance American Megatrends MegaRUM Dual Pentium II 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 MegaRUM motherboard. This manual was written for the OEM to assist in the proper installation and operation of this motherboard. This manual describes the specific
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Packing List You should have received the following: • a MegaRUM Dual Pentium II PCI ISA motherboard, • two serial cables, • one parallel cable, • one VGA cable, • two VGA driver diskettes for Windows 95 and Windows NT V3.5x, • 5 SCSI driver diskettes, • a diskette containing the American Megatrends DMI Wizard 95 software utility, • The DMI Wizard 95 User’s Guide, • the SystemGuru User’s Guide, • 4 diskettes containing the SystemGuru Server Management Software for Windows NT, • a Warr
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1 Hardware Installation Overview The American Megatrends MegaRUM PCI Dual Pentium II ISA motherboard features include: • two Intel Pentium II CPUs operating at 120, 133, 150, 166, 180, 200, 210, 233, 240, 266 MHz or higher speeds , • up to 1 GB of system memory on the motherboard, • parity checking or ECC (Error Checking and Correction), • PCI local bus throughput of 132 megabytes per second, • two Ultra Wide SCSI channels operating at 40 MBs, • specially designed for the American Megatrends RAI
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Overview, Continued Onboard I/O The MegaRUM motherboard includes: • an onboard ATI Rage II PCI VGA controller with 2 MB of synchronous graphics memory, • two onboard Symbios Logic 53C875 SCSI controllers that provide 2 40 MBs ultra wide SCSI channels and one ultra wide/narrow SCSI channel, • 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, • two 4-pin USB ports, and •
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MegaRUM PCI Dimensions The motherboard is approximately 12.25” by 13.8”. The motherboard height restrictions are shown below: Warning This motherboard contains sensitive electronic components that can be easily damaged by static electricity. Follow the antistatic instructions carefully to ensure correct installation and to avoid damage. Chapter 1 Hardware Installation 3
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MegaRUM PCI Motherboard Layout 4 MegaRUM PCI Motherboard User’s Guide
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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 foi
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Step 2 Configure CPU Speed If using two CPUs with different speed ratings, set the motherboard jumpers to the lower CPU speed. J21 and J24 select the CPU speed. The drawings on the next screens show how J24 and J21 should look for each possible CPU speed: CPU Speed J21 J24 120MHz OPEN Short Pins 1-2, Short Pins 3-4 Short Pins 5-6 Short Pins 7-8 133 MHz Shorted Short Pins 1-2, Short Pins 3-4 Short Pins 5-6 Short Pins 7-8 150 MHz OPEN Short Pins 3-4 Short Pins 5-6 Short Pins 7-8 166 MHz Shorted Sh
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Step 2 Configure CPU Speed, Continued Cont’d Chapter 1 Hardware Installation 7
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Step 2 Configure CPU Speed, Continued 8 MegaRUM PCI Motherboard User’s Guide
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Step 3 Configure CPU Voltage J5 and J15 Each CPU can be independently set to the correct CPU core voltage. J5 sets the voltage for the CPU in CPU Slot1. J15 sets the voltage for the CPU in Slot2. Core CPU Voltage J5 and J15 Setting 3.50V Short Pins 3-4 Short Pins 5-6 Short Pins 7-8 Short Pins 9-10 3.40V Short Pins 3-4 Short Pins 5-6 Short Pins 7-8 3.3V (Factory Setting) Short Pins 3-4 Short Pins 5-6 Short Pins 9-10 3.2V Short Pins 3-4 Short Pins 5-6 3.1V Short Pins 3-4 Short Pins 7-8 Short Pins
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Step 4 Install Additional Voltage Regulator One Voltage Regulator Module (VRM) is shipped with every MegaRUM motherboard. You need another VRM if you install two CPUs. You can order VRMs for Intel Pentium II CPUs from: Manufacturer Part Number AMI Part Number VXI 073-20715-02 MDL-P681-V5A140 Corsair SPX560KM MDL-P681-V5A140 10 MegaRUM PCI Motherboard User’s Guide
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Step 5 Connect CPU Fans J1 and J7 (shown below) are 3-pin bergs that connect the fan on the CPU heat sink to the motherboard power. J1 is the CPU fan connector for the CPU in CPU Slot1. J7 is the CPU fan connector for the CPU in CPU Slot2. Ground Pin 1 J1, J7, and +12V J23 pinout Fan Sense All Pentium II CPUs are shipped with a heat sink and a CPU fan. The connector from the CPU fan usually has three leads (has red, yellow, and black leads). Connect the Red lead to Pin 3 (+12V). Make sure that
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Step 7 Install Memory System Memory There are eight 32-bit SIMM (Single Inline Memory Module) sockets. System memory must be populated one bank at a time. Each bank has two sockets. 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 MegaRUM PCI is 8 MB. Each socket can hold one SIMM. You can use: •
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Step 7 Install Memory, Continued Select SIMMs SIMMs must meet the following specifications: Parameter Specification Page Mode FAST Refresh CAS before RAS tCAC ≤ 20 ns tRAC ≤ 80 ns tAA ≤ 45 ns tRP 70 ns CPA t ≤ 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 “ Mitsubish
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Step 7 Install Memory, Continued 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. The SIMM installation process is shown
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Step 8 Install the Motherboard The motherboard mounting hole pattern is shown below. 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
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Step 9 Attach Cables Connectors The MegaRUM PCI motherboard includes many connectors. Connection instructions, illustrations of connectors, and pinouts are supplied in the following pages. A list of all connectors described in this section follows: Connector Power supply connectors P1, P2, P3, and P4 Drain CMOS RAM power – J35 Keyboard connector J12 PS/2 mouse connector J2 Chassis intrusion LED – J29 External SMI connector – J18 Disable onboard VGA – J14 Hardware reset switch J28 Speaker J46 SCS
