American Megatrends Apollo IV User manual

Apollo IV Pentium
PCI ISA MotherboardGuide
MAN-772
11/21/97

Apollo IV PCI Pentium ISA Motherboard User’s Guide
ii
© 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 Megatrends’ 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 and Pentium are registered trademarks of Intel Corporation.
MS-DOS, Microsoft Word, and Microsoft are registered trademarks of Microsoft Corporation. Microsoft Windows 95 and Windows NT are
trademarks of Microsoft Corporation.
IBM, AT, VGA, PS/2, OS/2, and EGA are registered trademarks of International Business Machines Corporation. XT and CGA are 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.
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, UnixWare, and Unix are registered trademarks of The Santa Cruz Operation, Inc.
Toshiba is a registered trademark of Kabushiki Kaisha Toshiba.
VESA is a trademark of the Video Electronics Standards Association.
All other brand and product names are trademarks or registered trademarks of their respective companies.
Revision History
11/21/97 Initial release.

Preface iii
Preface
To the OEM Thank you for purchasing the high performance American Megatrends
Apollo IV PCI Pentium 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 Apollo IV 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 Apollo IV motherboard. It explains how to assemble a system
based on the Apollo IV 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 you need help installing, configuring, or running this product, call
American Megatrends technical support at 770-246-8645. You can also send
questions to tech support at:
[email protected].
American Megatrends BBS The American Megatrends BBS permits you to access technical
information about American Megatrends motherboard, peripheral, and BIOS
products. Product Engineering Change Notices, Tech Tips, and technical
documentation are available on the BBS. Some parts of the BBS are not
accessible to all callers. Call American Megatrends Technical Support at 770-
246-8645 to find out how to access the BBS.
Phone Numbers The BBS requires no parity, eight data bits, and one stop bit. The
characteristics of the BBS phone numbers are:
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.
Web Site We invite you to access the American Megatrends world wide web site at:
http://www.ami.com.

Apollo IV PCI Pentium ISA Motherboard User’s Guide
iv
Packing List
You should have received the following:
• an Apollo IV Pentium PCI ISA motherboard,
• a diskette containing the DMI Wizard 95 utility,
• the American Megatrends DMI Wizard 95 User’s Guide,
• an optional USB cable and mounting bracket,
• two serial cables,
• one parallel cable,
• a Warranty Card, and
• the American Megatrends Apollo IV Pentium ISA Motherboard User's Guide.
Warning
The pinout for the optional USB Cable Box is:
Pin 1 Red VCC
Pin 2 Green Data +
Pin 3 White Data -
Pin 4 Black Ground
Please make sure that the USB cable is correctly installed. Incorrect
installation will damage the motherboard.
Static Electricity
The Apollo IV motherboard can easily be damaged by static electricity. Make
sure you take appropriate precautions against static electric discharge:
• wear a properly-grounded wristband while handling the motherboard or any other
electrical component,
• touch a grounded anti-static surface or a grounded metal fixture before handling
the Apollo IV motherboard,
• handle system components by the mounting bracket, if possible.
Batteries Make sure you dispose of used batteries according to the battery
manufacturer’s instructions. Improper use of batteries may cause an
explosion. Make sure you follow the battery manufacturer’s instructions about
using the battery. Replace used batteries with the same type of battery or an
equivalent recommended by the battery manufacturer.

Chapter 1 Hardware Installation 1
1Hardware Installation
Overview
The American Megatrends Apollo IV PCI Pentium ISA motherboard includes
the following features.
CPU The CPU socket on the motherboard is a 321-pin ZIF socket. A switching
voltage regulator is required. You can install any of the following CPUs:
CPU Manufacturer Supported CPU Speeds
Intel® Pentium P55C 166, 200, and 233 MHz
Intel Pentium P54C with
MMX™ technology 90, 100, 120, 133, 150, 166, and 200 MHz
AMD® K6-166 166 MHz
AMD K6-200 200 MHz
AMD K6-233 233 MHz
AMD K5-PR90 90 MHz
AMD K5-PR100 100 MHz
AMD K5-PR120 90 MHz
AMD K5-PR133 100 MHz
AMD K5-PR150 105 MHz
AMD K5-PR166 116 MHz
AMD K5-PR200 133 MHz
MMX Technology This motherboard supports CPUs that include support for Intel MMX
technology. MMX technology allows you to experience richer video, audio,
digital imaging and communications when running the latest generation of
multimedia software on your computer. Cont’d

Apollo IV PCI Pentium ISA Motherboard User’s Guide
2
Overview, Continued
Chipset The Apollo IV PCI Pentium ISA baby-AT size motherboard uses an Intel
430TX chipset, including CPU interface controller, advanced cache
controller, integrated DRAM controller, synchronous ISA bus controller, PCI
local bus interface, and an integrated power management unit. The Intel
430TX chipset supports intelligent diagnostic and power management
through features such as DMI support.
Expansion Slots The motherboard includes:
• three 16-bit ISA expansion slots and
• four 32-bit PCI expansion slots.
The PCI local bus throughput can be up to 132 megabytes per second.
L1 Internal Cache The Intel Pentium on the motherboard has an 8 KB data cache and an 8
KB instruction cache.
L2 Secondary Cache The motherboard has 512 KB of pipeline burst direct-mapped,
WriteBack L2 secondary cache memory. Up to 256 MB of system memory
can be cached.
Supported Standards The Apollo IV motherboard supports:
• DMI,
• the Intel DPMA (Dynamic Power Management Architecture,
• Concurrent PCI V2.0 and V2.1, and
• USB (Universal Serial Bus).
Switching Voltage Regulator This motherboard includes a switching voltage regulator that
significantly reduces the CPU and voltage regulator temperature. This voltage
regulator is also fully upgradable to the next generation of Socket 7 CPUs.
These new CPUs will require more electrical current and will generate more
heat. Cont‘d

Chapter 1 Hardware Installation 3
Overview, Continued
CPU Thermal Monitor The Apollo IV motherboard includes a special heat sensor under the
CPU that monitors the CPU temperature. This heat sensor generates an SMI
(System Management Interrupt) when the CPU temperature is too hot. The
SMI can be set to turn on the external cooling fan and/or lower the CPU clock
frequency. You are waned that the CPU is overheating. The CPU is returned
to normal operating conditions when the CPU temperature returns to normal.
This feature can only be implemented if a power supply with a soft-off power
controller is installed in the computer. See the American Megatrends DMI
Wizard 95 User’s Guide for additional information about this feature.
SDRAM The Apollo IV motherboard provides two 168-pin DIMM system memory
sockets that support SDRAM (Synchronous Dynamic Random Access
Memory). SDRAM increases the CPU-to-memory data transfer rate to 528
MBs. This rate is normally 264 MBs if EDO DRAM is installed. The
integrated I2C controller optimizes the memory timing parameters.
System Memory The motherboard supports up to 256 MB of system memory mounted on the
motherboard as follows:
Type of System
Memory Socket Type of System Memory Supported System Memory
four 72-pin SIMM
sockets Fast Page Mode or EDO DRAM 8 MB, 16 MB, 32 MB, 64 MB, or 128 MB
two 168-pin DIMM
sockets EDO DRAM or SDRAM 8 MB, 16 MB, 32 MB, 64 MB, or 128 MB
Cont’d

Apollo IV PCI Pentium ISA Motherboard User’s Guide
4
Overview, Continued
PC 97 Compliant The Apollo IV motherboard is fully compliant with the Microsoft PC 97
specification at both the hardware and the BIOS levels.
PC 97 is a set of hardware, bus, and device design requirements specified by
Microsoft that make computers easier to use. PC 97 supports cooperation
between the operating system, the hardware, and the applications software.
Key PC 97 features include:
• Plug and Play compatibility,
• power management support for configuring and managing all system
components
• 32-bit device drivers, and
• standard installation procedures for Microsoft Windows 95 and Windows
NT.
AMIBIOS Features This motherboard has an AMIBIOS system BIOS on a Flash ROM with
built-in AMIBIOS Setup. AMIBIOS features include:
• IDE block mode and 32-bit data transfer support,
• IDE Programmed I/O modes 0, 1, 2, 3, and 4 support,
• PS/2 mouse support,
• IDE LBA mode support,
• APM (Advanced Power Management) and Flash BIOS hooks,
• EPA Green PC-compliant,
• PCI and Plug and Play (PnP) support, and
• DIM (Device Initialization Manager) support,
• DMI (Desktop Management Interface) support,
• can boot from a CD-ROM drive,
• automatically detects system memory, cache memory, and hard disk drive
parameters,
• Intel NSP-compliant,
• Fast ATA IDE mode programming and ATAPI support,
• Boot sector virus protection,
• instant-on support,
• automatically configures PnP and PCI devices. Cont’d

Chapter 1 Hardware Installation 5
Overview, Continued
BIOS Shadowing The system BIOS is always copied from ROM to RAM for faster execution.
The end user can shadow 16 KB ROM segments from C0000h – DCFFFh.
IDE The Apollo IV motherboard has two 40-pin IDE connectors onboard that
support up to four IDE drives (hard disk drives, CD-ROM drives, or tape
drives). The integrated PCI bus master enhanced IDE controller is on the PCI
local bus. The IDE controller supports the Ultra DMA/33 protocol, which
doubles the hard disk drive data transfer rates specified in the ATA-2
standards to 33 MBs while maintaining full backward compatibility with
existing PIO mode 3, PIO mode 4, and DMA mode 2 devices.
Fast ATA The motherboard supports the Fast ATA specification using PIO mode 4 and
multiword DMA mode 2.
Ultra DMA/33 This motherboard includes an integrated enhanced IDE PCI bus master IDE
controller that supports the Ultra DMA/33 protocol. The Ultra DMA/33
protocol permits data transfer rates up to 33 MBs. Ultra DMA/33 also reduces
the CPU workload and permits increased CPU utilization. Ultra DMA/33 is
completely backward-compatible with older DMA standards.
Floppy The Apollo IV motherboard has an onboard floppy controller that supports up
to two 360 KB, 720 KB, 1.2 MB, 1.44 MB, or 2.88 MB floppy drives.
Parallel Port The Apollo IV motherboard has an onboard ECP and EPP-capable parallel
port connector.
Serial Ports The Apollo IV motherboard has two onboard serial port connectors and two
16550 UART serial ports.
Keyboard The Apollo IV motherboard Includes a standard DIN keyboard connector.
Cont’d

Apollo IV PCI Pentium ISA Motherboard User’s Guide
6
Overview, Continued
Mouse The Apollo IV motherboard includes a 5-pin berg mouse connector.
USB The Apollo IV motherboard has two 4-pin USB connectors. USB allows
future generations of USB-compliant peripheral devices to be automatically
detected and configured through a single port. USB uses Plug and Play
technology. All USB peripherals are automatically detected and configured.
The AMIBIOS on this motherboard provides complete USB system BIOS
support.
Power Connectors The Apollo IV motherboard has three power supply connectors.
RTC/CMOS RAM A real time clock and 128 bytes of CMOS RAM with a battery backup is
provided on the motherboard.
Power Management Power management services include:
• Green PC LED,
• power management signal to Green PC-aware power supplies,
• automatic IDE and video power down,
• monitor blanking,
• SMI (System Management Interrupt) support,
• APM, and
• system stop clock.
PCI Slots The motherboard conforms to the PCI Version 2.1 specification. The
concurrent PCI architecture of this motherboard allows faster CPU, PCI, and
ISA bus transactions for faster and smoother multimedia performance. This
motherboard allows you to install either PCI V2.0 or PCI V2.1-comaptible
adapter cards
The PCI slots are automatically configured by the AMIBIOS. The PCI slots
operate synchronously with the CPU clock, as follows:
CPU External Clock Frequency PCI Expansion Slot Frequency
66 MHz 33 MHz
60 MHz 30 MHz
Onboard I/O The Apollo IV Pentium ISA motherboard includes:
• two 40-pin IDE connectors on the PCI bus that support up to four IDE
drives,
• a 34-pin floppy drive connector,
• two 10-pin serial port connectors (with 16550 UARTs),
• a 26-pin parallel port connector with ECP and EPP support,
• an infrared connector,
• two USB connectors that support an optional riser card that permit high
speed Plug and Play connection to USB-compliant external peripheral
devices,
• a keyboard connector, and
• a PS/2 mouse connector. Cont’d

Chapter 1 Hardware Installation 7
Overview, Continued
DMI In a corporate environment, system manageability is an important
consideration. DMI (Desktop Management Interface) is a specification for a
standard method of storing and reporting system information. This
motherboard supports the DMI specification on the system BIOS level. DMI
detects and records system configuration information, including the CPU type
and speed, memory size and type, and much more information. DMI
maintains a local database of system configuration information that can be
accessed and even modified from a remote location.
The American Megatrends DMI Wizard 95 is also shipped with this
motherboard. Use DMI Wizard 95 to display and modify DMI information.
DMI Wizard 95 allows a system integrator or user to add additional
information to the DMI database, such as serial numbers and chassis
information. See the American Megatrends DMI Wizard 95 User’s Guide for
additional information.
Infrared This motherboard includes a 10-pin serial infrared connector. Infrared allows
bidirectional cordless data transactions with other IrDA-compliant computers
and peripheral devices. Infrared transmissions can occur in half-duplex
(sequential transmission/receiving) or full-duplex (simultaneous
transmission) modes.
A 10-pin infrared connector is provided on the motherboard. The
motherboard and AMIBIOS comply with the IrDA SIR infrared device
standards and specifications.
This motherboard complies fully with the IrDA infrared standards. An IrDA-
compliant device can be installed via a 9-pin D-type connector on the rear of
the computer. The 9-pin connector is attached by a cable to the IR berg
connector on the motherboard, next to the serial connectors (COM1 and
COM2). COM2 on the motherboard is an IrDA-compliant port. You must set
the Serial Port2 Mode, IR Transmission Type, and other AMIBIOS Setup
options under Peripheral Setup before you can use an infrared device.

Apollo IV PCI Pentium ISA Motherboard User’s Guide
8
Apollo IV Dimensions
Motherboard Size The Apollo IV Pentium PCI ISA motherboard is the standard baby AT size
(11” by 8.6”).
Motherboard Height Restrictions

Chapter 1 Hardware Installation 9
Installation Steps
Step Action
1Unpack the motherboard.
2Set Jumpers
3Configure the CPU.
Select the CPU voltage.
Select the CPU speed.
Install the CPU.
4Install memory.
Install system memory.
5Install the motherboard.
6Attach cables to connectors.
Connect the power supply.
Attach the keyboard cable.
Connect the mouse cable.
Attach cables.
7Connect onboard I/O.
Connect the serial ports.
Connect the parallel port.
8Connect floppy drive(s).
9Connect the IDE drive(s).
10 Test and configure.
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.

Apollo IV PCI Pentium ISA Motherboard User’s Guide
10
Apollo IV Motherboard Layout
SpeakerIDE
LED
PWR
LEDKbd Lock
Reset
Susp.
Mode
Switch
Turbo
LEDSusp.
LED
Remote
Power
Switch

Chapter 1 Hardware Installation 11
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 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.

Apollo IV PCI Pentium ISA Motherboard User’s Guide
12
Step 2 Set Jumpers
Set all jumpers and install the CPU before placing the motherboard in the
chassis. Set jumpers by placing a shunt (shorting bridge) on the designated
pins of the jumper. A shunt and jumpers are shown below:
Shunt3-pinBerg2-pinBerg
Inthismanual,jumpersareshownintwo-dimensions,
asifviewedfromdirectlyabove,as shown below:
1
3
5
2
4
6
Theplacementofshuntsis
indicated byasolidline
between pins,as shown
betweenPins1-2
totheright:
1
3
5
2
4
6
3-dimensionalviewofmotherboardjumpersand ashunt.
PWR1 Power Supply Type PWR1 is a 3-pin berg that sets the power supply type:
PWR1 Setting Description
Short Pins 1-2 AT-type power supply is installed (factory setting).
Short Pins 2-3 Remote power supply is used.
CPW Clear Password CPW is a 2-pin berg that allows you to delete the system BIOS
password should you forget the password. CPW should be OPEN at all times
during normal operation. Should you forget the password: turn power off,
remove the computer cover, turn power on, place a shorting bridge (shunt) on
CPW for a few seconds, then turn power off again. Reboot the computer and
re-enter all system configuration information, because you have just erased all
of it. Cont’d

Chapter 1 Hardware Installation 13
Step 2 Set Jumpers, Continued
EP1, EP2 Flash ROM Type EP1 and EP2 are 3-pin bergs that specify the type of flash ROM
installed on the motherboard. The settings are:
Flash ROM Type EP1 EP2
Intel 28F001 Short Pins 2-3 Short Pins 1-2
SST 29EE010 OPEN Short Pins 2-3
MXIC MX28F2000 Short Pins 2-3 Short Pins 2-3
SST 29EE020 OPEN Short Pins 2-3
ATMEL AT29C020 OPEN Short Pins 2-3
AMD 28F020 Short Pins 1-2 Short Pins 2-3
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.

Apollo IV PCI Pentium ISA Motherboard User’s Guide
14
Step 3 Configure CPU
Important
Perform the following steps to configure the
motherboard before installing a CPU.
External CPU Clock CLK1, CLK2, and CLK3 are 3-pin bergs that set the CPU external clock
frequency. This motherboard may have any of four different clock generators:
• IMI652,
• ICS 9147,
• ICW, or
• PhaseLink.
The CLK1, CLK2, and CLK3 settings are different with the different clock
generators. You must determine the clock generator type (it’s next to the
CPU) before setting these jumpers.
IMI 652 Clock Generator The following CLK1, CLK2, and CLK3 settings apply only if an
IMI 652 clock generator is mounted on the motherboard.
External
(CPUCLK) CLK1 CLK2 FREQ1
66 MHz Short Pins 1-2 Short Pins 1-2 Short Pins 2-3
60 MHz Short Pins 2-3 Short Pins 1-2 Short Pins 2-3
55 MHz Short Pins 2-3 Short Pins 2-3 Short Pins 2-3
50 MHz N/A N/A N/A
Cont’d

Chapter 1 Hardware Installation 15
Step 3 Configure CPU, Continued
ICS 9147 Clock Generator The following CLK1, CLK2, and CLK3 settings apply only if an
ICS 9147 clock generator is mounted on the motherboard.
External
(CPUCLK) CLK1 CLK2 FREQ1
66 6 MHz Short Pins 1-2 Short Pins 2-3 Short Pins 2-3
60 MHz Short Pins 2-3 Short Pins 2-3 Short Pins 2-3
55 MHz Short Pins 1-2 Short Pins 1-2 Short Pins 2-3
50 MHz Short Pins 2-3 Short Pins 1-2 Short Pins 2-3
ICW or PhaseLink Clock Generator The following CLK1, CLK2, and CLK3 settings apply
only if an ICW or PhaseLink clock generator is mounted on the motherboard.
External
(CPUCLK) CLK1 CLK2 FREQ1
66 6 MHz Short Pins 1-2 Short Pins 1-2 Short Pins 1-2
60 MHz Short Pins 2-3 Short Pins 1-2 Short Pins 1-2
55 MHz Short Pins 2-3 Short Pins 2-3 Short Pins 1-2
50 MHz N/A N/A N/A
CPU/Bus Frequency Ratio FREQ1, FREQ2, and FREQ3 are 3-pin bergs that set the ratio of
the internal CPU frequency to the bus clock.
For
P54C For P55C,
and K6
For
K5 FREQ1 FREQ2 FREQ3
3x 3x 2x Short Pins 1-2 Short Pins 2-3 Short Pins 1-2
2.5x 2.5x 1.75x Short Pins 2-3 Short Pins 2-3 Short Pins 1-2
2x 2x N/A Short Pins 2-3 Short Pins 1-2 Short Pins 1-2
1.5x 3.5x 1.5x Short Pins 1-2 Short Pins 1-2 Short Pins 1-2
Cont’d

Apollo IV PCI Pentium ISA Motherboard User’s Guide
16
Step 3 Configure CPU, Continued
Summary of Jumper Setting for Intel Pentium CPUs
Multi Ext. IMI 652 Clock Generator OCS 9147 Clock Generator
Speed plier Speed CLK1 CLK2 CLK3 CLK1 CLK2 CLK3 FREQ1 FREQ
2FRE Q3
P55C
233 3.5x 66
200 3x 66
166 2.5x 66
P54C
200 3x 66
166 2.5x 66
150 2.5x 60
133 2x 66
120 2x 60
100 1.5x 66
90 1.5x 60
Cont’d