American Megatrends MAN-759 manual Preface

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Preface

To the OEM Thank you for purchasing the high performance American Megatrends Pegasus 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 Pegasus 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 Pegasus PCI motherboard. It explains how to assemble a system based on the Pegasus 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.

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.

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.

Preface

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Contents Pegasus Pentium PCI ISA Motherboard Revision History Preface Phone Number Characteristics American Megatrends BBSPacking List Overview CPUsCPU External Clock Frequency PCI Expansion Slot Frequency Pegasus PCI Dimensions Pegasus PCI Motherboard Layout Unpack the Motherboard Avoid Static ElectricityStep Action J16 J17 J18 J19 J21 J22 Configure CPU SpeedConfigure CPU Voltage Core CPU Voltage J5 and J15 SettingJ12 Manufacturer Part Number AMI Part Number Install Voltage RegulatorConnect CPU Fan Install Memory Install CPUParameter Specification Simm Part NumbersType Manufacturer Part Number Install the Motherboard Attach Cables ConnectorAttach Cables P2 Pinout P1 PinoutPin Description Cmos Drain J29 Setting P14 PinoutP3 Pinout Pin Assignments Pin Ground Keyboard Lock Kbdinh VCC Connect I/O Pin Signal DescriptionSTROBE# Connect I/O J4 Floppy Connector Pinout Twist in Floppy CablePin Use Connect I/O Connect I/O KEY N/C REQ Pegasus drivers include Install DriversTest and Configure Hardware Installation Page Winbios Setup Using a Mouse with Winbios Setup Using the Keyboard with Winbios SetupKeystroke Action Winbios Setup Windows See Section Winbios Setup MenuStandard Setup SetupScsi Drive Type How to ConfigureParameter Description 152 MB Hard Disk Drive TypesAdvanced Setup Setting Description Any optional option ROM messages are displayedOptional option ROM messages are not displayed Advanced Setup Optimal and Fail-Safe default settings are Disabled Cont’d Advanced Setup Disabled Optimal and Fail-Safe default settings are Disabled Chipset Setup Power Management APM to Enabled and set the power Advanced Power Management APM option toChipset Setup Chipset Setup Power Management Setup Power Management Setup Power Management Setup IRQ3 IRQ4 IRQ5 IRQ7 IRQ9 IRQ10 IRQ11 IRQ12 IRQ15 VGA Palette Action PCI/PnP SetupPCI/PnP Setup IRQ3 IRQ4 IRQ5 IRQ7 IRQ9 IRQ10 IRQ11 IRQ12 IRQ14 IRQ15 DMA Channel Peripheral Setup Offboard PCI IDE Primary IRQ Peripheral Setup Peripheral Setup EPP Security Amibios Password SupportSetting a Password Anti-Virus Changing a PasswordUtility Original OptimalFail-Safe Programming the Flash Eprom Programming Flash ROMProgramming the Flash ROM Number Description Code Description Bootblock Code Checkpoint CodesDeleting a Password Avoid Static Electricity Engineering Specifications Frequency Heat Airflow Temperatur Sink Over CPU Over otherComponent