American Megatrends Baby Screamer LC User manual

American Megatrends, Inc.
Series 62
Baby Screamer LC
80386 Motherboard
User's Guide
MAN-662
7/8/92

ii
© Copyright 1992 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 according to the terms and conditions on the warranty card enclosed with this product. American
Megatrends, Inc. shall not be liable in tort or contract for any loss or damage, direct, incidental or consequential. See the
Warranty Registration Card shipped with this product for full warranty details.
Limitations of Liability
In no event shall American Megatrends, Inc. 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
American Megatrends acknowledges the following trademarks:
Intel is a registered trademark of Intel Corporation.
MS-DOS, Xenix, and Microsoft are registered 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.
Hitachi is a registered trademark of Hitachi America, Ltd.
FasMath is a trademark of Cyrix Corporation.
Motorola is a registered trademark of Motorola 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.
Unix is a registered trademark of American Telephone and Telegraph Company Bell Laboratories.
Weitek is a trademark of Weitek, Inc.
Toshiba is a registered trademark of Kabushiki Kaisha Toshiba.
Chips and Technologies, NEAT, and CHIPSet are registered trademarks of Chips and Technologies Incorporated.
Revision History
7/8/92 Initial printing.

BabyScreamerLCMotherboardUser'sGuide
iii
Table of ContentsTable of Contents
Chapter 1 Introduction..................................................................................................................................................................................... 1
Description............................................................................................................................................................................ 2
System Support Functions.................................................................................................................................................... 4
Chapter 2 Installation........................................................................................................................................................................................ 5
Unpacking.............................................................................................................................................................................. 5
Installation Steps ................................................................................................................................................................................... 7
Step 1 Set Switch and Jumper Options ................................................................................................................................ 8
Step 2 Install Memory............................................................................................................................................................ 9
Step 3 Install Coprocessor................................................................................................................................................... 12
Step 4 Install the Motherboard.............................................................................................................................................. 14
Step 5 Connect the Power Supply....................................................................................................................................... 16
Step 6 Connect the Keyboard.............................................................................................................................................. 17
Step 7 Connect Cables......................................................................................................................................................... 18
Step 8 Install Adapter Cards ................................................................................................................................................ 20
Step 9 Perform Initial Test and Configuration....................................................................................................................... 22
Chapter 3 BIOS Power-On Self Test (POST)................................................................................................................................................ 23
AMIBIOS Beep Codes........................................................................................................................................................... 24
AMIBIOS Displayed Messages............................................................................................................................................. 25
BIOS NMI Handler Messages................................................................................................................................................ 27
Chapter 4 AMIBIOS Setup................................................................................................................................................................................ 29
Section 1 Running AMIBIOS Setup....................................................................................................................................................... 31
Section 2 Standard CMOS Setup......................................................................................................................................................... 35
Section 3 Advanced CMOS Setup....................................................................................................................................................... 39
Typematic Rate Programming............................................................................................................................... 40
Typematic Rate Delay........................................................................................................................................... 40
Typematic Rate..................................................................................................................................................... 40
Numeric Processor............................................................................................................................................... 41
Weitek Processor ................................................................................................................................................ 41
Floppy Drive Seek At Boot .................................................................................................................................. 41
System Boot Up Sequence ................................................................................................................................. 41
System Boot Up CPU Speed................................................................................................................................. 41
Cache Memory..................................................................................................................................................... 41
Fast Gate A20 Option........................................................................................................................................... 42
Password Checking Option.................................................................................................................................. 42
Video ROM Shadow C000,16K............................................................................................................................ 42
Video ROM Shadow C400,16K............................................................................................................................ 42
Section 4 AMIBIOS Password Support................................................................................................................................................ 43
Section 5 Hard Disk Utility..................................................................................................................................................................... 45
Hard Disk Format Utility......................................................................................................................................................... 47
Auto Interleave Utility............................................................................................................................................................ 49
Hard Disk Utility Error Messages.......................................................................................................................................... 51
Appendix A Upgrading to 128 KB Cache....................................................................................................................................................... 53
Index................................................................................................................................................................................................................... 55

iv
PrefacePreface
To theTo the OEMOEM
Thank you for purchasing the high performance Series 62 Baby Screamer LC AT-compatible motherboard. It is assumed that you have also
licensed the rights to use the American Megatrends documentation for the Baby Screamer LC.
This manual was written for the OEM to assist in the proper installation, use, and operation of the Baby Screamer LC motherboard. This
manual is not meant to be read by the computer owner who purchases a computer with the Baby Screamer LC 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 SupportTechnical Support
If an motherboard fails to operate as described or you are in doubt about a configuration option, please call technical support at 404-246-8600.
AcknowledgmentsAcknowledgments
This manual was written by Paul Narushoff, UmaS. Monda, Vivek Saxena, and Robert Cheng.
Packing SlipPacking Slip
You should have received the following items:
•Baby Screamer LC motherboard, and the
•Baby Screamer LC Motherboard User's Guide.

BabyScreamerLCMotherboardUser'sGuide
11
Chapter 1Chapter 1
IntroductionIntroduction
DimensionsDimensions
The 80386 Baby Screamer LC is an IBM® AT®-compatible motherboard, approximately 8.6 by 13 inches. It is identical in size to a
standard XT motherboard with identical mounting hole locations. The height of the board components is no more than 1½ inches.
Allow 2 inches of clearance for the power supply connectors. See the following graphic.

Chapter1-Introduction
22
DescriptionDescription
MicroprocessorMicroprocessor
The Baby Screamer LC motherboard is equipped with a 25 or 33 MHz Intel 80386DX.
Processor SpeedsProcessor Speeds
The Baby Screamer LC operates at either of two processor speeds. The high speed is 25 or 33 MHz. The low speed is about 8 MHz.
The processor speed is selected through the keyboard or via the Turbo switch connected to J8.
Cache MemoryCache Memory
The Baby Screamer LC can have 64 KB of two-way set-associative or 128 KB of direct-mapped cache memory. Cache memory is
supplemented by a four-byte doubleword write buffer that allows it to operate at zero read and write wait states.
The cache memory operates on up to 128 MB of system memory.
System MemorySystem Memory
The Baby Screamer LC can have up to 128 MB on the motherboard. The Baby Screamer LC uses 256 KB x 9, 1 MB x 9, 4 MB x 9
SIMMs, or 16 MB x 9 SIMMs (Single Inline Memory Modules). The SIMM memory speed must be 70 ns.
Turbo SwitchTurbo Switch
The Baby Screamer LC has both hardware and software speed switching. Software speed switching is via the BIOS <Ctrl> <Alt> <+
or -> keychords. Hardware speed switching is via a turbo switch.

BabyScreamerLCMotherboardUser'sGuide
33
Description,Description,Continued
ROMROM
The Baby Screamer LC has 64 KB of ROM for the system BIOS, BIOS Setup, and hard disk utilities.
BIOS ShadowingBIOS Shadowing
The system BIOS is always shadowed and cached. The Video BIOS memory area from C0000h–C7FFFh can be shadowed and
cached.
AMIBIOSAMIBIOS
The AMIBIOS used in the Baby Screamer LC has a built-in Setup utility, built-in hard disk drive utilities, user-definable hard disk drive
types, and can configure systems with no monitor, floppy drive, or keyboard.
Real Time Clock and CMOS RAM with Built-in BatteryReal Time Clock and CMOS RAM with Built-in Battery
The Baby Screamer LC has a built-in Dallas Semiconductor DS1287 Real Time Clock/CMOS RAM chip that has a built-in rechargeable
3.6V battery. The Baby Screamer LC has 128 bytes of battery-backed CMOS RAM to store system configuration information.
Math Coprocessor SocketMath Coprocessor Socket
The Baby Screamer LC has a socket for an optional Weitek® 3167 math coprocessor. It also has a slot for an Intel 80387, Cyrix®
83D87, or other 80387-compatible coprocessor.
Expansion SlotsExpansion Slots
The AM Baby Screamer LC has eight 16-bit expansion slots with 8 MHz bus timing.

Chapter1-Introduction
44
System Support FunctionsSystem Support Functions
The Baby Screamer LC motherboard has the following standard AT-compatible system elements:
•seven Direct Memory Access (DMA) channels,
· Channels 0 - 3 for 8-bit data transfer, and
· channels 5 - 7 for 16-bit data transfers.
•sixteen interrupt levels,
Supports eleven levels of interrupt:
IRQ3 - IRQ7, IRQ9 - IRQ12, IRQ14, and IRQ15.
•three programmable timers,
•a system clock,
•standard I/O capability, including:
· uses 32-, 16-, and 8-bit memory devices, and
· uses 16- and 8-bit I/O devices.
•I/O bus operating at 8 MHz.
• 8- and 16-bit IBM AT-compatible expansion slots,
• the standard I/O address space of 100h through 3FFh,
•24-bit memory addresses to access 16 MB of memory,
•uses the I/O channel check to generate an NMI,
•has I/O wait state generation,
•has an open bus structure (allowing multiple microprocessors to share the system's resources, including memory),
•allows system memory refresh from channel microprocessors,
•has a crystal-controlled real time clock with battery back-up,
•provides a standard 5-pin IBM AT-compatible DIN connector for the keyboard,
•supports a hardware Deturbo switch,
•has a keyboard lock to prevent unauthorized access, and
•has a standard speaker attachment.

BabyScreamerLCMotherboardUser'sGuide
55
Chapter 2Chapter 2
InstallationInstallation
UnpackingUnpacking
StepStep ActionAction
1. Inspectthecardboardcartonforobviousdamage.Ifdamaged,call
TechnicalSupportat404-246-8600.
LeavetheBabyScreamerLCmotherboardinitsoriginalpacking.
2. Performallunpackingandinstallationproceduresonaground
connectedanti-staticmat.Theoperatorshouldwearan
anti-staticwristband,groundedatthesamepointasthe
anti-staticmat.Oruseasheetofconductivealuminumfoil
groundedthrougha1megohmresistorinsteadoftheanti-static
mat.Similarly,astripofconductivealuminumfoilwrappedaround
thewristandgroundedthrougha1megohmresistorservesthe
samepurposeasthewrist-band.
3. Insidethecarton,themotherboardispackedinananti-staticbag,
andsandwichedbetweensheetsofsponge.Removethesponge
andremovetheanti-staticbag.Placethemotherboardona
groundedanti-staticsurfacecomponent-sideup.Savetheoriginal
packingmaterialincaseofreshipment.
4. Inspectthemotherboardfordamage.PressdownonallICs
mountedinsocketstoverifyproperseating.Donotapplypowerto
themotherboardifithasbeendamaged.
5. Ifthemotherboardisundamaged,itisreadytobeinstalled.

Chapter2-Installation
6

BabyScreamerLCMotherboardUser'sGuide
7
Installation StepsInstallation Steps
The steps for assembling a system that uses the 80386 Baby Screamer LC motherboard are shown in the following table. Each step
is discussed in detail in the following pages.
StepStep ActionAction Turn toTurn to
1 Setswitchandjumperoptions Page8
2 Installmemory Page9
3 Installcoprocessors Page12
4 Installmotherboard Page14
5 Connectthepowersupply Page16
6 Connectthekeyboard Page17
7 Connectcables Page18
8 Installadaptercards Page20
9Performinitialtestandconfiguration Page22
Standoffs and mounting screws are not supplied with the 80386 Baby Screamer LC motherboard. They usually are supplied with the
chassis.

Chapter2-Installation
8
Step 1 Set Switch and Jumper OptionsStep 1 Set Switch and Jumper Options
Set all user-configurable jumpers and switches, and install coprocessors before installing the motherboard in the chassis. There is one
user-configurable switch and ten jumpers.
SW1SW1
SW1 is an two-position DIP switch. See the graphic on page 6for the location of SW1.
SwitchSwitch DescriptionDescription
1Diagnosticsisusedformanufacturingdiagnostics.The
motherboardisshippedwiththisswitchOff.Theswitch
shouldremainOff.
2COL/MONOsetsthetypeofvideodisplayadaptercardinthe
system.Thisswitchisfactory-settoOff,foramonochrome
displayadapter(MDA).SetOnforacolorgraphicsadapter
(CGA).ThisswitchhasnoeffectonEGA®andVGA®
adapters.
J100J100 Cache Size SelectCache Size Select
J100 is a two-pin single-inline berg that selects the cache size. Place a shorting bridge on pins 1-2 (CLOSED) if 128 KB of cache
memory is installed. Remove the shorting bridge (OPEN) if 64 KB of cache memory is installed.

BabyScreamerLCMotherboardUser'sGuide
9
Step 2 Install MemoryStep 2 Install Memory
The main memory subsystem on the Baby Screamer LC motherboard consists of two 32-bit memory banks of four SIMM (Single
Inline Memory Module) sockets each. The SIMM banks accept 256 KB, 1 MB, 4 MB, or 16 MB x 9 bit SIMMs.
Memory ConfigurationMemory Configuration
The Baby Screamer LC supports the following motherboard memory configurations:
Bank0 Bank1 Total Memory
256 KB x 9 SIMMs None 1 MB
256 KB x 9 SIMMs 256 KB x 9 SIMMs 2 MB
1 MB x 9 SIMMs None 4 MB
1 MB x 9 SIMMs 1 MB x 9 SIMMs 8 MB
4 MB x 9 SIMMs None 16 MB
4 MB x 9 SIMMs 4 MB x 9 SIMMs 32 MB
16 MB x 9 SIMMs None 64 MB
16 MB x 9 SIMMs 16 MB x 9 SIMMs 128 MB
The amount of system memory displayed by the BIOS will be 384 KB less than the total amount of memory installed, because the
384K segment between 640K and 1 MB is used by the system for main BIOS and VGA BIOS shadowing and is not counted.

Chapter2-Installation
10
Step 2 Install Memory,Step 2 Install Memory,Continued
SelectingSelecting SIMMsSIMMs
The SIMMs must meet the following specifications:
ParameterParameter SpecificationSpecification
PageMode Fast
Refresh CASbeforeRAS
tCAC ≤20ns
tRAC ≤70ns
tAA ≤45ns
tRP 70ns
tCPA ≤45ns
SIMM Part NumbersSIMM Part Numbers
Memory Type Manufacturer Part Number
1 MB x 9 Fujitsu® MB85235-70
Toshiba® THM91070AS-70
THM91000AS-70
Motorola® MCM91000S-70
MCM91430S-70
Oki® MSC2312A-704S9
NEC® MC-42100A9-70
Samsung® KMM591000AN-7
Siemens HYM910005-70
4 MB x 9 Motorola MCM94000A-70
Samsung KMM594000A-70
Oki MSC2340-70459
16 MB x 9 Mitsubishi MH16M09J-7
Mitsubishi MH16M09TJ-7
Samsung KMM5916000-7

BabyScreamerLCMotherboardUser'sGuide
11
Step 2 Install Memory,Step 2 Install Memory,Continued
InstallingInstalling SIMMsSIMMs
Both Bank 0 and Bank 1 have four SIMM sockets. Use 256 KB x 9, 1 MB x 9, 4 MB x 9, or 16 MB x 9 SIMMs. Use only one type of
SIMM to fill each memory bank.
1. Place the motherboard on an anti-static mat.
2. Firmly push the SIMM into the socket with the component side facing the interior of the motherboard. When properly
inserted, the SIMM will click into place. The following graphic illustrates SIMM installation.
SIMM TypesSIMM Types
The graphic below shows the two types of SIMMs.
Types of SIMM Modules

Chapter2-Installation
12
Step 3 Install CoprocessorStep 3 Install Coprocessor
The 80386 Baby Screamer LC motherboard supports the Weitek WTK3167, Intel 80387, and Cyrix83D87 or other 387-
compatible coprocessors.
Choosing A CoprocessorChoosing A Coprocessor
The coprocessor must operate at the same frequency as the system microprocessor. The following table lists math coprocessor
parts.
BoardBoard
FrequencyFrequency IntelIntel Part No.Part No. CyrixCyrix Part No.Part No. Weitek Part No.Weitek Part No.
25MHz 80387-25 83D87-25 WTL3167-025
33MHz 80387-33 83D87-33 WTL3167-033
Installing the WTK3167 on the MotherboardInstalling the WTK3167 on the Motherboard
U22 is the empty 121-pin PGA socket between the cache memory and microprocessor. The socket is labeled Weitek. Pin 1 of the
socket is near the chamfered edge of the socket. This corner corresponds to pin 1 of the Weitek also identified by a chamfered edge
(on the bottom of the coprocessor).
Check for bent pins on the coprocessor. Gently straighten any bent pins using a pair of pliers. Install the component into the socket.
Align the pins and press the Weitek coprocessor firmly into the socket, making sure that pin 1 of the Weitek coprocessor is aligned
with pin 1 of socket U22. See the following figure. Make sure that the Weitek coprocessor option in the Advanced CMOS Setup is
enabled. The Weitek math coprocessor will not work unless it is enabled in BIOS Setup. See the Advanced CMOS Setup Section on
page 39.

BabyScreamerLCMotherboardUser'sGuide
13
Step 3 Install Coprocessor,Step 3 Install Coprocessor,Continued
Installing aInstalling a Cyrix orCyrix or Intel coprocessor on theIntel coprocessor on the
MotherboardMotherboard
An Intel 80387 or Cyrix 83D87 coprocessor will fit in the Weitek 121-pin PGA socket. The 80387 and 83D87 are 64-pin PGA-mount
coprocessors. Surface-mount coprocessors will not work.
Fist, enable the Numeric Coprocessor option in Advanced CMOS Setup in the BIOS Setup utility (see page 41).
When installing the Cyrix or Intel coprocessor, align pin 1 as described for the Weitek (remember, the chamfered edge is on the
bottom of the coprocessor), and insert the coprocessor in the center of the socket, leaving the outer set of pin sockets empty. See
the figures on the following page.

Chapter2-Installation
14
Step 3 Install Coprocessor,Step 3 Install Coprocessor,Continued
Test for Math CoprocessorTest for Math Coprocessor
The AMIBIOS displays a System Configuration
screen at the end of BIOS POST (Power On Self
Test). The math coprocessor will be displayed here.
If the Installed message is not displayed, reinstall
the coprocessor. Switch off the power, check the
orientation of the coprocessor, press the chip firmly
to make sure that it is fully inserted, and then power the system up again. If the same result occurs, call Technical Support at 404-
246-8600.
Step 4 Install the MotherboardStep 4 Install the Motherboard
The mounting hole pattern on the Baby Screamer LC motherboard is identical to the mounting hole pattern on the IBM XT
motherboard. See the following graphic.
Cyrix 83D87 Coprocessor Intel 80387 Coprocessor

BabyScreamerLCMotherboardUser'sGuide
15
Step 4 Install the Motherboard,Step 4 Install the Motherboard,Continued
Step Action
aPlace the chassis for the motherboard on an anti-static mat.
bConnect the chassis to ground to avoid static damage during installation.
cConnect an alligator clip with a wire lead to any unpainted part of the chassis.
dGround the other end of the lead at the same point as the mat and the
wristband.
eRotate the chassis so that the front is to the right, and the rear is to the left.
The power supply is mounted at the far end of the chassis.
fPush four nylon standoffs from the solder side of the motherboard in the
holes provided for them. The standoffs lock in place.
gFind the slots provided for the standoffs on the chassis.
hHold the motherboard, component-side up, with the edge with three standoffs
toward the front, and the edge with the power supply connector away from
you. The edge connectors for the adapter cards are on the left.
iCarefully slide the motherboard into the chassis. Make certain that the
standoffs fit the slots provided for them. If the standoffs are properly
locked, the motherboard should not slide. It should also rest level with the
chassis. The far edge should fit the slots in the plastic clips.
jPlace the two mounting screws in the holes provided for them and tighten
them. If necessary, shift the motherboard slightly to align the mounting holes
on the motherboard with the holes on the chassis.

Chapter2-Installation
16
Step 5 Connect the Power SupplyStep 5 Connect the Power Supply
The power supply should match the physical configuration of the chassis. Make sure that the power switch is Off before performing
this step. Before attaching all components, make sure that the proper voltage has been selected. Power supplies often can run on a
wide range of voltages, but must be set (usually with a switch) to the proper range. Use at least a 200 watt (or larger) power supply,
which should have built-in filters to suppress radiated emissions.
AT-compatible power supplies have two six-pin connectors that are inserted in P1 and P2. The six-pin connector with three red wires
and two black wires is connected to P2 and the remaining 6-pin connector is connected to P1.