SOYO 5EAS5 User's Manual & Technical Reference

5EAS5

P54C/P55C PCI Mainboard
User’ s Guide &
Technical Reference



SOYO

About This Guide

TM

This User’s Guide is for assisting system manufacturers and end users in setting

up a nd installi ng the mainboard. Information in this guide has been carefully
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the contents. The information in this docu ment is subject to change without
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Table of Contents

Chapter 1: Introduction… … … .… … … … ..… . … … … ..1

Key Features………………………………..…………………1

Un pa cking the Mainboard………… …………… …………2
Electr ostatic Disch ar ge Pr ecautions……………… ……….2
Mainboar d Layout W/ Default Settings……..…………………3
Remar ks on the Cyri x an d IBM P200 CPUs……..………….5
Voltage Setting List……………………………………………5

Chapter 2: Hardware Setup.… … … … … … … … … ..6

Jumper s…..………………………………….. ……… ………6

JP5: CMOS Clear Jumper……………..…………………..6

J25: EMI Groun d Pin… … …… … …… … … … … … .6

JP16: PCI Bus Asynchr onous/Synchron ous Jumper…..7
CPU T ype Confi gur at ion ………………… ………………… 8
Step 1: Frequency Setting………………………………….. 8
P54C/P55C-75/90/100 CPU Settings (1.5 x clock)…….8
P54C/P55C-100/120/133 CPU Settings (2.0 x clock)….9
P54C/P55C-150/166 CPU Settings (2.5 x clock)……..10
P54C/P55C-180/200 CPU Settings (3.0 x clock)……..10

3. 5x clock CPU Setti n gs (233 MHz CPUs)….…….. 11

4.0x clock CPU Settin gs (266 MHz CPUs)…………11
Step 2: CPU Single/Dual Voltage Settin g…….. ………12
Singl e Voltage CPU Setting…… ….………… ……12
Dual Volt age CPU Setti ng………… …………… .. 13
Memory Configur ation… ………… ……………………… ..13
Memory Configuration Table……………………………..14
RAM Ban k Installa tion Notice…………..…………….14
Cache Configurat ion………………… …………………….14
Cache Size and RAM Locations………………………….14
Mult i I/O Port Addresses… ………… …………… ………..15
Connectors…………..………………………………………….15
COM1, COM2-COM1/COM2 Connectors…………………15
FDC Connector…………………………………………..…15
J19-Hardware Reset Control………………………………..15
J24-HDD LED Connectors…………………………………15
CN5-IR Connect or … …… … ………………… …… … .. 16
CN2-Keyboa rd Con nector…………………… …… …. .16

J17-Keylock & Power LED Connector……………………..16
IDE1/IDE2 - Onboard Primary/Secondary IDE Connectors.16
CN1-PS/2 Mouse Con nector… … ……………………..16
PRT-Paral lel Port Con nector … ……………… ………..16
AT Power Conn . - AT power suppl y conn ector……..16
J23: Sleep Switch Connector En able/Disable…………….17
CN3-Universal Serial Bus Con nectors……………………17
J18 speaker……………………………………………….. 17

Chapter 3: BIOS setup… … ..… . … … … . .… … … .… … ..18

Stan dard CMOS Setup… … … .… … .… … .…… .… …… 19
BIOS Features Setup… … … … .… ..… … … … .… … … 21
Chipset Features Setup… ..… … ..… … … …… ..… … .… 24

Powe r Management Setup… … … .. .. … … … … … … 2 6

PNP/PCI Configuration Setup…… … … ..… … .… … … 29
Load Setup Defaults… … … ..… … … ..… .… … … … … 31
Load BIOS Defaults… … … ..… .… … … ...… ..… … … 31
Integrated Peripherals… … … … … ...… … … .… … … 32
Supervisor Password...… … … … … … ..… … … … … … 34
USER Password… … . … … … … .… … . … … … … … … 3 5
IDE HDD Auto Detection… … .… … … ..… … .… … … 36

App endix… … … .… … … … … .… … … … ..… … … .… … ..37

Appendi x A: Jumper for Cyrix/IBM CPU(J100)……..…..37
Appendix B : Quick In stallation Guide. .……… ..… . … 38

1 Introduction

The EQ82C661X PCI mainboard is a high-performance AT form-factor
system board that supports P54C/P55C family CPUs. You can order
512K of external cache memory on the mainboard. The mainboard is
fully compatible with industry standards, and adds many technical
enhancements.

Key Features

¥ CPU

Ñ Supports P54C/P55C family CPUs running at 90~200 MHz

speeds; Cyrix/IBM CPUs running at PR120+~PR200+ speeds;
and AMD K5/K6 CPUs running at PR75 ~ PR233 speeds

Ñ Two kinds of mainboards are available: one is the Normal edition

which supports above listed CPUs and the other is the IBM CPU
attached edition which supports the IBM 6x86 P200+ CPU only

Ñ Supports SOCKET 7 for upgrade

Ñ Supports P54C/P55C series SMM Mode and CPU Stop Clock

¥ L2 Cache Controller

Ñ Write Back Cache Modes and Direct Mapped Organization
Ñ On-board 512K Pipeline Burst SRAMs Cache

¥ DRAM Controller

Ñ Supports FPM/EDO/Burst EDO/Synchronous Ð DRAM

Ñ Supports 1 stripsof 8/16/32 MB Unbuffered DIMMs

Ñ On-board memory configurations from 4 to 256 Mbytes
Ñ Supports ÒTable-FreeÓ DRAM configuration in any SIMM bank

¥ BUS Controller

Ñ Compliant to PCI specifications v2.1
Ñ Three 32-bit PCI slots (Masters) and four ISA slots, 4-layer PCB
Ñ Supports Universal Serial Bus Ñ USB

¥ Peripheral Controller

Ñ System BIOS built-in NCR805 SCSI Card BIOS and ÒPlug and

PlayÓ function
Ñ On-board built-in PCI Master IDE controller and floppy controller
Ñ On-board supports for two high speed UARTS (w/i 16550 FIFO),

one ECP/EPP/SPP compatible parallel port, and one PS/2 mouse

port

Ñ On-board supports FLASH Memory for easy upgrade BIOS

2 Introduction

Unpacking the Mainboard

The mainboard package contains:
¥ The EQ82C661X Mainboard
¥ This UserÕs Guide

Note: Do not unpack the mainboard until you are ready to install it.

Follow the precautions below while unpacking the mainboard.

1. Before handling the mainboard, ground yourself by grasping an
unpainted portion of the systemÕs metal chassis.

2. Remove the mainboard from its anti-static packaging and place it on
a grounded surface, component side up.

3. Check the mainboard for damage. If any chip appears loose, press
carefully to seat it firmly in its socket.

Do not apply power if the mainboard appears damaged. If there is
damage to the board contact your dealer immediately.

Electrostatic Discharge Precautions

Make sure you ground yourself before handling the mainboard or other
system components. Electrostatic discharge can easily damage the
components. Note that you must take special precaution when handling
the mainboard in dry or air-conditioned environments.

Take these precautions to protect your equipment from electrostatic
discharge:

¥ Do not remove the anti-static packaging until you are ready to install

the mainboard and other system components.

¥ Ground yourself before removing any system component from its

protective anti-static packaging. To ground yourself grasp the
expansion slot covers or other unpainted portions of the computer

chassis.
¥ Frequently ground yourself while working, or use a grounding strap.
¥ Handle the mainboard by the edges and avoid touching its

components.

Introduction 3

Mainboard Layout w/ Default Settings

2

2 2

3 3

1

14

14

5

4

17 16

18

15

11

1212

13

8

7

10

9

2

6

Figure 1Ð1. Mainboard Layout

1. ZIF socket 7 (for P54C/P55C) 10. SIMM Bank

2. EQ82C661X Chipset 11. Floppy Connector

3. Pipelined Burst SRAM 12. IDE1/IDE2 Connector

4. Super I/O Chip 13. Parallel Port Connector

5. PnP FLASH BIOS 14. COM1/COM2 Connector

6. TAG SRAM 15. AT Power Connector

7. ISA Slots 16. KB Connector

8. PCI Slots 17. PS/2 Mouse Connector

9. Unbuffered DIMM Bank 18. 3 Volt. Lithium Battery

4

Introduction

Default settings are as follows: Pentium 133MHz (P54C) CPU , 512K
Pipelined Burst cache , On - board PCI E - IDE Enabled , 2 high speed
UARTS Enabled (w / 16550 FIFO), 1 EPP/ECP port (ECP + EPP mode),
5V DRAM/3.3V DIMM, and AT power supply.

1

1

CN1

CN2

(KB)

FLASH BIOS

JP5

1

CN5

USB

IR

J25

(PS/2

1

EQ6619

EQ6617

EQ6617

JP32

JP16
JP12

JP11
JP10

EQ6618

586CPU

J100

Family

JP31

JP15

JP14

JP13

JP30

4
2

2
4

64Kx32

64Kx32

Figure 1-2. Mainboard Default Setting

Important: Make sure the system is well ventilated to prevent

overheating and ensure system stability.

Introduction 5

Remarks on the Cyrix and IBM P200+ CPUs

Please note that if you use a Cyrix or IBM P200+ CPU, you will have to set the
frequency to 75MHz. You will also have to set JP16, the PCI bus frequency
jumper to asynchronous to have the PCI bus run on 32MHz, in order to avoid
problems with add-on cards. If you choose to run the PCI bus on a higher
frequency, please use only high-end add-on cards that are specified to function
on higher bus frequencies. Please note that using a 75MHz bus clock also places
higher demands on the DRAM main-memory, therefore only use high-end
SIMM/DIMM modules when this is the case.

Voltage settings list

Jumpers 30, 31 and 32 set the processor voltage. If you are using a single voltage
processor close jp31 and open jp30. Jp31 shorts the processor Vcore voltage pins
to the Vio pins when closed. If you use a dual voltage CPU, open jp31 and close
jp30.

Jp 32 sets the voltage, please refer to the following table:

voltage JP32

1-2 3-4 5-6 7-8

3.5V close close close close

3.4V close close close open

3.3V close close open close

3.2V close close open open

3.1V close open close close

3.0V close open close open

2.9V close open open close

2.8V close open open open

2.7V open close close close

2.6V open close close open

2.5V open close open close

2.4V open close open open

2.3V open open close close

2.2V open open close open

2.1V open open open close

2.0V open open open open

2 Hardware Setup

This chapter is designed for Normal edition mainboard use only and it
explains how to configure the mainboardÕs hardware. After you install
the mainboard, you can set jumpers, install memory on the mainboard,
and make case connections. Refer to this chapter whenever you upgrade
or reconfigure your system.

CAUTION: Turn off power to the mainboard, system chassis, and

peripheral devices before performing any work on the

mainboard or system.

Jumpers

JP5: CMOS Clear Jumper

Clear the CMOS memory by momentarily shorting pin 2Ð3; then
shorting pin 1Ð2 to retain new settings.

CMOS Setting JP5

Retain CMOS data

(default)

1

Clear CMOS data

1

J25: EMI Ground Pin

J25 is designed for eliminating the EMI signals. Short or open J25 when
is needed.

Hardware Setup 7

JP16: PCI Bus Asynchronous/Synchronous Jumper

Asynchronous and synchronous (default) PCI bus frequency settings are
available.

PCI Bus Setting JP16

Asychronous

1

Synchronous

1

Divides the host bus by 2 to get the Asynchronous setting, and sets the
PCI bus on 32MHz to get the synchronous setting. Set JP16 to
Synchronous mode when the system is unstable.

Host Bus

(CPU Bus)

PCI Bus Frequency

(Synchronous)

PCI Bus Frequency

(Asynchronous)

50 MHz* 25 MHz 32 MHz

55 MHz* 27.5 MHz 32 MHz

60 MHz 30 MHz 32 MHz

66 MHz 33.3 MHz 32 MHz

75 MHz** 37.5 MHz 32 MHz

*: Do not use Asynchronous setting when the host bus frequency is

50MHz or 55MHz.

**: Do not use Synchronous setting when the host bus frequency is 75

MHz.

8 Hardware Setup

CPU Type Configuration

This section is designed for normal edition manboard use only and also
shows you how to configure your CPU step by step. Note that you need
to check the CPU voltage before installation.

❑ Step 1: Frequency Setting

Pentium – 75/90/100 CPU Settings (1.5 x clock)
AMD K5 – PR75/PR90/PR100/PR120/PR133 (1.5 x clock)

EQ6619

JP14

JP13

586

CPU

Family

EQ6618

1

JP12
JP11
JP10

Pentium – 75/50 MHz
AMD K5 – PR 75/50MHz

Pentium – 90/60 MHz
AMD K5 – PR 90/60MHz
AMD K5 – PR 120/60 MHz

1

JP12
JP11
JP10

1

JP12
JP11
JP10

Pentium – 100/66 MHz
AMD K5 – PR 100/66 MHz
AMD K5 – PR 133/66 MHz

1

JP12
JP11
JP10

Figure 2Ð1Ð1. CPU Jumper Settings

Note: 1. You must equip the CPU with a fan and heat sink for system

stability.

2. AMD K5ÐPR75/90= AMD 5k86(SSA5)ÐP75/90.

Hardware Setup

9

JP12
JP11
JP10

1

EQ6619

EQ6618

JP14

JP13

JP12

JP11

JP10

JP12
JP11

JP10

JP12
JP11

JP10

JP12
JP11
JP10

JP12
JP11
JP10

1

1

1

1

1

Figure 2-1-2. CPU Jumper Settings

stability.

10 Hardware Setup

Pentium– 150/166 CPU Settings (2.5 x clock)
AMD K5/K6 – PR166 CPU Setting

JP14

JP13

586

CPU

Family

EQ6618

1

JP12
JP11
JP10

1

JP12
JP11
JP10

Pentium – 150/60 MHz

Pentium – 166/66 MHz
AMD K5/K6 – PR166

1

JP12
JP11
JP10

EQ6619

Figure 2Ð1Ð3. CPU Jumper Settings

Note: You must equip the CPU with a fan and heat sink for system

stability.

Pentium – 180/200 CPU Settings (3.0 x clock)
AMD K6 – PR200 CPU Setting

JP14

JP13

586

CPU

Family

EQ6618

1

JP12
JP11
JP10

1

JP12
JP11
JP10

Pentium – 180/60 MHz

Pentium – 200/66 MHz

1

JP12
JP11
JP10

EQ6619

Figure 2Ð1Ð4. CPU Jumper Settings

Note: You must equip the CPU with a fan and heat sink for system

stability.

Hardware Setup

11

stability.

stability.

JP12
JP11

JP10

Figure 2-1-2. CPU Jumper Settings

Figure 2-1-2. CPU Jumper Settings

1

JP14

JP13

stability.

JP12

1

JP11

JP10

JP14

JP15

JP13

Figure 2-1-3. CPU Jumper Settings

Single voltage CPUs use the same voltage for both Vio and Vcore. The
CPUs that fall into this category are : P54CX , AMD-K5 and the Cyrix
6x86. Refer to the following figures to set the voltage for these CPUs:

JP32

7

8

1

2

586

2
4

CPU

Family

JP30

4
2

JP31

Figure 2-2-1. Single Voltage 3.3V CPU

JP32

7

8

1

2

586

2
4

CPU

Family

JP30

4
2

JP31

Figure 2-2-2. Single Voltage 3.5V CPU (Default)

Dual voltage CPUs are designed to use different voltages for Vio and
Vc ore. They include P55CX and the Cyrix 6x86L / 6x86MX. Refer
to the following figure to set the voltage for these CPUs:

3.2V CPU

2.9V CPU

JP32

2.8V CPU

586

2
4

CPU

Family

2.1V CPU

JP30

4
2

JP31

Figure 2-2-3 Dual V oltage CPU

Note: Due to varying desings, please ask your dealer for the correct
voltage settings for your specific CPU.

1. In Bank 1

2. In Bank 2

3. In Bank 1 & Bank 2

4. In DIMM

5. In Bank 2& DIMM

Cache Size

512KB

Cache RAM TAG RAM

Cacheable

Range

Hardware Setup 15

Multi I/O Port Addresses

Default settings for multi I/O port addresses are shown in the table below.

Port I/O Address IRQ Status

LP T1*
CO M1
CO M2

If default I/O port addresses conflict with other I/O cards (e.g. sound cards
or I/O cards ) , you must adjust one of the I/O addresses to avoid address
conflict. (You can adjust these I/O addresses from the BIOS)

Note: Some sound cards have a default IRQ setting for IRQ7, which
may conflict with printing functions. If this occurs do not use sound
card functions at the same time you print.

378H 7 ECP + EPP
3F8H 4
2F8H 3

Connectors

Attach the mainboard to case devices via connectors on the mainboard. Refer to
Figure 1-1 for connector locations and connector pin positions.

COM1, COM2 – COM1/COM2 Connectors

Attach COM1/COM2 device to these connectors.

FDC Connector

Attach floppy cable to this connector.

J19 – Hardware Reset Control

Attach the reset switch to J19. Closing the Reset switch restarts the system.

J24 – HDD LED Connector

Attach the cable of hard disk drive LED to this connector. The LED lights when
an HDD is active.

16

Hardware Setup

CN5 - IR Connector

Attach a 5-pin infrared device cable to this connector for enabl ing the infrared
transfer function. This mainboard meets the specification of ASKIR and HPSIR.

CN2 - Keyboard Connector

A 5-pin female DIN keyboard connector is located at the rear of the board. Plug
the keyboard jack into this connector.

J17 - Keylock & Power LED Connector

J17 is a connector for a lock that may be installed on the system case for enabling
or disabling the keyboard. J17 also attaches to the case’s Power LED. (Pin 1,3 for
power LED and pin 4,5 for keylock.)

IDE1/IDE2 - Onboard Primary/Secondary IDE HDD Connectors

Attach cable of hard disk drives to these connectors.

CN1 - PS/2 Mouse Connector

Attach PS/2 mouse cable to this connector.

PRT - Parallel Port Connector

Attach parallel port cable to this connector.

PW - AT Power Supply Connector

The mainboard requires a power supply with at least 200 watts and a “power
good” signal. PW has two 6-pin male header connectors. Plug the dual connectors
from the power directly onto the board connector while making sure the black
leads are in the center.

Hardware Setup

17

J23: Sleep Switch Connector Enable/Disable

Toggle this jumper to force the system into power saving (green) mode.
Any hardware IRQ signal will cause the system to wake up.

CN3: Universal Serial Bus Connectors

Attach a 9 pin USB cable to these connectors to connect external USB
devices to the mainboard.

J18: Speaker Connector

Attach the connector from the speaker in your case to this jumper.

3 BIOS Setup

The mainboardÕs BIOS setup program is the ROM PCI/ISA BIOS from
Award Software Inc. Enter the Award BIOS programÕs Main Menu as
follows:

1. Turn on or reboot the system. After a series of diagnostic checks,
you are asked to press DEL to enter Setup.

2. Press the <DEL> key to enter the Award BIOS program and the
main screen appears:

ROM PCI/ISA BIOS

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP

BIOS FEATURES SETUP

CHIPSET FEATURES SETUP

POWER MANAGEMENT SETUP

PNP/PCI CONFIGURATION

LOAD SETUP DEFAULTS

LOAD BIOS DEFAULTS

INTEGRATED PERIPHERALS

SUPERVISOR PASSWORD

USER PASSWORD

IDE HDD AUTO DETECTION

SAVE & EXIT SETUP

EXIT WITHOUT SAVING

Time, Date, Hard Disk Type...

Esc : Quit ↑ ↓ → ← : Select Item
F10 : Save & Exit Setup (Shift) F2 : Change Color

3. Choose an option and press <Enter>. Modify the system parameters
to reflect the options installed in the system. (See the following
sections.)

4. Press <ESC> at anytime to return to the Main Menu.

5. In the Main Menu, choose ÒSAVE AND EXIT SETUPÓ to save
your changes and reboot the system. Choosing ÒEXIT WITHOUT
SAVINGÓ ignores your changes and exits the program.

The Main Menu options of the Award BIOS are described in the sections
that follow.

BIOS Setup 19

Standard CMOS Setup

Run the Standard CMOS Setup as follows.

1. Choose ÒSTANDARD CMOS SETUPÓ from the Main Menu. A
screen appears.

ROM PCI/ISA BIOS

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

Date (mm:dd:yy) : Fri, Feb 1 1995
Time (hh:mm:ss) : 7 : 30 : 33

HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDZ SECTOR MODE
Primary Master : AUTO 0 0 0 0 0 0 AUTO

Primary Slave : None 0 0 0 0 0 0 ---­Secondary Master : None 0 0 0 0 0 0 ---­Secondary Slave : None 0 0 0 0 0 0 ----

Drive A : 1.44M, 3.5 in.
Drive B : None

Video : EGA/VGA
Halt On : All Errors

Esc : Quit ↑ ↓ → ← : Select Item PU/PD/+/– : Modify
F11 : Help (Shift) F2 : Change Color F3 : Toggle Calendar

Base Memory: 640K

Extended Memory: 3328K

Other Memory: 128K

Total Memory: 4096K

2. Use arrow keys to move between items and select values. Modify
selected fields using PgUp/PgDn/+/Ð keys. Some fields let you enter
values directly.

Date (mm/dd/yy) Type the current date.

Time (hh:mm:ss) Type the current time.

Primary
(Secondary)
Master & Slave

First, choose the type of hard disk that you
already installed:
Auto Ð BIOS detects hard disk type

automatically (default)
1 ~ 46 Ð Selects standard hard disk type
User Ð User defines the type of hard disk.

Next, choose hard disk mode:
Auto Ð BIOS detects hard disk mode

automatically (default)
Normal Ð Normal IDE hard disk (smaller than

528MB)
LBA Ð EnhancedÐIDE hard disk (larger

than 528MB)

20 BIOS Setup

Primary
(Secondary)
Master & Slave
(Continued)

Large Ð Large IDE hard disk (for certain

hard disk)

Note: If you have any questions on your hard

disk type or mode, ask your hard disk
provider or previous user for details.

Drive A & B Choose 360KB , 5 1/4 in.,

1.2MB , 5 1/4 in.,
720KB , 3 1/2 in.,

1.44M , 3 1/2 in.(default),

2.88 MB, 3 1/2 in. or

Not installed

Video Choose Monochrome, Color 40x25,

VGA/EGA (default), Color 80x25

Halt On When BIOS detects system errors, this function

will stop the system. Choose one of the
following options to make system halt.

All Errors (default) All, But Diskette
No Errors All, But Keyboard

All, But Disk/Key

3. When you finish, press the <ESC> key to return to the Main Menu.

BIOS Setup 21

BIOS Features Setup

Run the BIOS Features Setup as follows.

1. Choose ÒBIOS FEATURES SETUPÓ from the Main Menu and a
screen with a list of items appears. (The screen below shows the
BIOS default settings.)

ROM PCI/ISA BIOS

BIOS FEATURES SETUP

AWARD SOFTWARE, INC.

CPU Internal Cache : Enabled
External Cache : Enabled
Quick Power on Self Test : Enabled
Boot Sequence : A,C,SCSI
Swap Floppy Drive : Disabled
Boot Up NumLock Status : On
Typematic Rate Setting : Disabled
Typematic Rate (Chars/Sec) : 6
Typematic Delay (Msec) : 250
Security Option : Setup
IDE Second Channel Control : Enabled
PS/2 Mouse Function Control: Disabled
PCI/VGA Palette Snoop : Disabled
OS Select for DRAM >64MB : Non-OS2

ESC : Quit ↑ ↓ → ←: Select Item
F1 : Help PU/PD/+/– : Modify
F5 : Old Values (Shift)F2 : Color
F6 : Load BIOS Defaults
F7 : Load Setup Defaults

Video BIOS Shadow : Enabled
C8000-CBFFF Shadow : Disabled
CC000-CFFFF Shadow : Disabled
D0000-D3FFF Shadow : Disabled
D4000-D7FFF Shadow : Disabled
D8000-DBFFF Shadow : Disabled
DC000-DFFFF Shadow : Disabled

2. Use the arrow keys to move between items and to select values.
Modify the selected fields using the PgUp/PgDn/+/Ð keys. <F> keys
are explained below:
<F1>: ÒHelpÓ gives options available for each item.
Shift <F2>: Change color.
<F5>: Get the old values. These values are the values with

which the user started the current session.
<F6>: Load all options with the BIOS Setup default values.
<F7>: Load all options with the Power-On default values.

A short description of screen items follows:

CPU Internal
Cache

This option enables/disables the CPUÕs internal
cache. (The Default setting is Enabled.)

External Cache This option enables/disables the external cache

memory. (The Default setting is Enabled.)

Quick Power
On Self Test

Enabled provides a fast POST at boot-up .

22 BIOS Setup

Boot Sequence Choose the boot device sequence as your need. For

example, ÒA, C, SCSIÓ means BIOS will look for an
operating system first from drive A, drive C, then
SCSI device. Options of this function are:
A, C, SCSI
C, A, SCSI
C, CDÐROM, A
CDÐROM, C, A
D, A, SCSI
E, A, SCSI
F, A, SCSI
SCSI, A, C
SCSI, C, A
C only.

Swap Floppy
Drive

Enabled changes the sequence of the A: and B:
drives. (The Default setting is Disabled.)

Boot Up Num
Lock Status

Choose On or Off. On puts numeric keypad in Num
Lock mode at boot-up. Off puts this keypad in arrow
key mode at boot-up.

Typematic Rate
Setting

Enable this option to adjust the keystroke repeat rate.

Typematic Rate
(Chars/Sec)

Choose the rate a character keeps repeating.

Typematic
Delay (Msec)

Choose how long after you press a key that a
character begins repeating.

Security Option Choose Setup or System. Use this feature to prevent

unauthorized system boot-up or use of BIOS Setup.

ÒSystemÓ Ð Each time the system is booted the
password prompt appears.

ÒSetupÓÐ If a password is set, the password prompt
only appears if you attempt to enter the Setup
program.

BIOS Setup 23

IDE Second
Channel
Control

Default setting is Enabled. Choose Disabled when
you need to turn off the onboard IDE second
channel.

PS/2 Mouse
Function
Control

Default setting is Disabled. You need to enable this
function when the PS/2 mouse is attached.

PCI/VGA
Palette Snoop

Enabled: The color of the monitor may be incorrect

if uses with MPEG card. Enable this
option to make the monitor normal.

Disabled: Default setting.

OS Select for
DRAM >64MB

OS2 Ð Choosing this when you are using OS/2

operation system.

Non-OS/2 Ð Choosing this when you are using no-

OS/2 operation system.

Video or
Adapter BIOS
Shadow

BIOS shadow copies BIOS code from slower ROM
to faster RAM. BIOS can then execute from RAM.
These 16K segments can be shadowed from ROM to
RAM. BIOS is shadowed in a 16K segment if it is
enabled and it has BIOS present.

3. After you have finished with the BIOS Features Setup program,
press the <ESC> key and follow the screen instructions to save or
disregard your settings.

24 BIOS Setup

Chipset Features Setup

The Chipset Features Setup option changes the values of the chipset
registers. These registers control system options in the computer.

Note: Change these settings only if you are familiar with the Chipset.

Run the Chipset Features Setup as follows.

1. Choose ÒCHIPSET FEATURES SETUPÓ from the Main Menu and
the following screen appears. (The screen below shows default
settings.)

ROM PCI/ISA BIOS

CHIPSET FEATURES SETUP

AWARD SOFTWARE, INC.

ESC : Quit ↑ ↓ → ←: Select Item
F1 : Help PU/PD/+/– : Modify
F5 : Old Values (Shift)F2 : Color
F6 : Load BIOS Defaults
F7 : Load Setup Defaults

DRAM Auto Configuration : 60 ns
DRAM Timing Control : Auto

Read Pipeline : Disabled
Write Pipeline : Enabled

Video BIOS Cacheable : Disabled
System BIOS Cacheable : Disabled
Memory Hole At 15Mb Addr.: Disabled

OnChip USB : Disabled

2. Use the arrow keys to move between items and select values.
Modify selected fields using the PgUp/PgDn/+/Ð keys.

A short description of screen items follows:

DRAM Auto
Configuration

Choose 60ns (default) or 70ns when the
DRAM Timing Control needs to be set to
Auto; and; when choose Disabled, the
DRAM Timing Control can be set to
Normal, Medium, Fast, or Turbo.

DRAM Timing Control Choose Auto, Normal, Medium, Fast, or

Turbo. BIOS sets the DRAM Timing
automatically when this function is set to
Auto. Normal is the slowest and you must
check the system stability before you
change to the Fast of Turbo setting,
otherwise it should be on Auto.

BIOS Setup 25

SDRAM Cycle Length 2 (default). This function is shown only

when uses SDRAM.

Read Pipeline Use the default setting.

Write Pipeline Use the default setting.

Video BIOS Cacheable Disabled Ð The ROM area F0000H-

FFFFFH is not cached.

Enabled Ð The ROM area F0000H-

FFFFFH is cacheable if cache
controller is enabled.

System BIOS Cacheable Disabled Ð The video BIOS C0000H-

C7FFFH is not cached.

Enabled Ð The video BIOS C0000H-

C7FFFH is cacheable if cache
controller is enabled.

Memory Hole At 15Mb
Addr

Choose Enabled or Disabled (default).
Some interface cards will map their ROM
address to this area. If this occurs, you
should select Enabled, otherwise use
Disabled.

OnChip USB Default is Disabled. Enable this function

when you use the USB device.

USB Keyboard Support Enable this function when you use the

USB keyboard, but notice that you need to
use the regular keyboard first before
getting in the BIOS setup.

3. After you have finished with the Chipset Features Setup, press the
<ESC> key and follow the screen instructions to save or disregard
your settings.

26 BIOS Setup

Power Management Setup

The Power Management Setup option sets the systemÕs power saving
functions.

Run the Power Management Setup as follows.

1. Choose ÒPOWER MANAGEMENT SETUPÓ from the Main Menu
and a screen with a list of items appears.

ROM PCI/ISA BIOS

CMOS SETUP UTILITY

POWER MANAGEMENT SETUP

Power Management : Disabled
PM Control by APM : Yes
Video Off Option : Suspend -> Off
Video Off Method : V/H SYNC+Blank
Conserve Mode : Disabled

** PM Timers **
HDD Power Down : Disabled
Doze Mode : Disabled
Suspend Mode : Disabled

** PM Events **
VGA : OFF
LPT & COM : LPT/COM
HDD & FDD : ON
DMA/master : OFF
Primary INTR : ON
IRQ 3 (COM 2) : Primary
IRQ 4 (COM 1) : Primary

ESC : Quit ↑ ↓ → ←: Select Item
F1 : Help PU/PD/+/– : Modify
F5 : Old Values (Shift)F2 : Color
F6 : Load BIOS Defaults
F7 : Load Setup Defaults

** Power Down & Resume Events **
IRQ 5 (LPT 2) : Primary
IRQ 6 (Floppy Disk) : Primary
IRQ 7 (LPT 1) : Primary
IRQ 8 (RTC Alarm) : Disabled
IRQ 9 (IRQ2 Redir) : Secondary
IRQ 10 (Reserved) : Secondary
IRQ 11 (Reserved) : Secondary
IRQ 12 (PS/2 mouse) : Primary
IRQ 13 (Coprocessor) : Primary
IRQ 14 (Hard Disk) : Primary
IRQ 15 (Reserved) : Disabled

2. Use the arrow keys to move between items and to select values.
Modify the selected fields using the PgUp/PgDn/+/- keys.

A short description of selected screen items follows:

Power
Management

Options are as follows:
User Define Ð LetÕs you define the HDD and

system power down times.
Disabled Ð Disables the Green PC Features.
Min Saving Ð Doze timer = 1 Hour

Suspend timer = 1 Hour

HDD Power Down = 15 Min
Max Saving Ð Doze timer = 10 Sec

Suspend timer = 10 Sec

HDD Power Down = 1 Min

BIOS Setup 27

PM Control by
APM

Choose Yes (default) or No. APM stands for
Advanced Power Management. To use APM,
you must run Òpower.exeÓ under DOS v6.0 or
later version.

Video Off Option Susp, Stby→off:Video off when the system

runs into Suspend or Standby
mode.

All Modes→off: Video off in all modes.

Always On: Video never off.

Suspend→off: Video off when system runs

into the suspend mode.

Video Off Method Choose V/H Sync+Blank (default), Blank

screen, or DPMS for the selected PM mode.

Conserve Mode Use the default setting.

HDD Power Down When the set time has elapsed, the BIOS sends a

command to the HDD to power down, which
turns off the motor. Time is adjustable from 1 to
15 minutes. The default setting is Disabled.
Some older model HDDs may not support this
advanced function.

Doze Mode When the set time has elapsed, the BIOS sends a

command to the system to enter doze mode
(system clock drops to 33MHz). Time is
adjustable from 10 seconds to 1 Hour.

Suspend Mode The default is Disabled. Only an SL-Enhanced

(or SMI) CPU can enter this mode. Time is
adjustable from 10 seconds to 1 Hour. Under
Suspend mode, the CPU stops completely (no
instructions are executed.)

VGA Choose Off (default) or On to disable or enable

the power management.

28 BIOS Setup

LPT & COM Choose LPT/COM (default) or LPT (COM) to

enable the power management timer. Choose
NONE to disable the power management timer.

HDD &FDD Choose On (default) to enable the power

management timer, or Off to disable the power
management timer.

DMA/master Choose Off (default) or On. If you choose the

system ÒOffÓ, will not monitor the signal of
DMA/master; and when you choose ÒOnÓ, the
system will not have SMI signal until the master
is finished while the master is working.

Primary INTR When On (default) is chosen, you can choose

any IRQ #.

IRQ# When set at ÒPrimaryÓ the processor will power

down only after the BIOS detects a Òno IRQ
activityÓ during the time specified by the
Suspend time. If set at ÒSecondary eventÓ the
system will distinguish whether an interrupt
accesses and I/O address or not. If it does, the
system enters the standby mode. If not, the
system enters the dreaming mode; that is the
system goes back full-on status but leaves the
monitor blank. For instance, if the system
connects to a LAN and receives an interrupt
from its file server, the system will enter the
dreaming mode to execute the corresponding
calling routine.

3. After you have finished with the Power Management Setup, press
the <ESC> key to return to the Main Menu.

BIOS Setup 29

PNP/PCI Configuration Setup

This option sets the mainboardÕs PCI Slots. Run this option as follows:

1. Choose ÒPNP/PCI CONFIGURATION SETUPÓ from the Main
Menu and the following screen appears. (The screen below shows
default settings.)

ROM PCI/ISA BIOS

PNP/PCI CONFIGURATION

AWARD SOFTWARE, INC.

Resources Controlled By : Manual
Reset Configuration Data : Disabled

IRQ-3 assigned to : Legacy ISA*
IRQ-4 assigned to : Legacy ISA*
IRQ-5 assigned to : PCI/ISA PnP*
IRQ-7 assigned to : PCI/ISA PnP*
IRQ-9 assigned to : PCI/ISA PnP*
IRQ-10 assigned to : PCI/ISA PnP*
IRQ-11 assigned to : PCI/ISA PnP*
IRQ-12 assigned to : PCI/ISA PnP*
IRQ-14 assigned to : PCI/ISA PnP*
IRQ-15 assigned to : PCI/ISA PnP*
DMA-0 assigned to : PCI/ISA PnP*
DMA-1 assigned to : PCI/ISA PnP*
DMA-3 assigned to : PCI/ISA PnP*
DMA-5 assigned to : PCI/ISA PnP*
DMA-6 assigned to : PCI/ISA PnP*
DMA-7 assigned to : PCI/ISA PnP*

PCI IRQ Actived By : Level
PCI IDE IRQ Map To : PCI-AUTO
Primary IDE INT# : A
Secondary IDE INT# : B

ESC : Quit ↑ ↓ → ←: Select Item
F1 : Help PU/PD/+/– : Modify
F5 : Old Values (Shift)F2 : Color
F6 : Load BIOS Defaults
F7 : Load Setup Defaults

*: These items will disappear when Resource Controlled. is Auto.

2. Use the arrow keys to move between items and select values.
Modify selected fields using the PgUp/PgDn/+/Ð keys.

A short description of screen items follows:

Resources
Controlled By

Manual Ð BIOS doesnÕt manage PCI/ISA PnP

card (i.e., IRQ) automatically.

Auto Ð BIOS auto manage PCI and ISA PnP

card (recommended).

Reset
Configuration
Data

Disabled Ð Retain PnP configuration data in

BIOS.

Enabled Ð Reset PnP configuration data in

BIOS.

30 BIOS Setup

IRQX and
DMAX assigned
to

Choose PCI/ISA PnP or Legacy ISA. If the first
item is set to Manual, you could choose IRQX
and DMAX assigned to PCI/ISA PnP card or ISA
card.

PCI IRQ
Activated By

Choose Edge or Level. Most PCI trigger signals
are Level. This setting must match the PCI card.

PCI IDE IRQ
Map To

Select PCI-AUTO, ISA, or assign a PCI SLOT
number (depending on which slot the PCI IDE is

inserted). The default setting is PCI-AUTO. If
PCI-AUTO does not work, then assign an
individual PCI SLOT number.

Primary IDE
INT#

Choose INTA#, INTB#, INTC#, or INTD#. The
default setting is INTA#.

Secondary IDE
INT#

Choose INTA#, INTB#, INTC#, or INTD#. The
default setting is INTB#.

3. After you have finished with the PCI Slot Configuration, press the
<ESC> key and follow the screen instructions to save or disregard
your settings.

BIOS Setup 31

Load Setup Defaults

This item loads the system values you have previously saved. Choose
this item and the following message appears:

ÒLoad SETUP Defaults (Y/N)? NÓ

To use the SETUP defaults, change the prompt to ÒYÓ and press
<Enter>. This item is recommended if you need to reset the system
setup.

Note: The SETUP Defaults are optimized for the most stabilized

performance.

Load BIOS Defaults

Choose this item and the following message appears:

ÒLoad BIOS Defaults (Y/N)?NÓ

To use the BIOS defaults, change the prompt to ÒYÓ and press <Enter>.

Note: BIOS DEFAULTS values are adjusted for high performance. If

you run into any problems after loading BIOS DEFAULTS,
please load the SETUP DEFAULTS for the stable performance.

32 BIOS Setup

Integrated Peripherals

The Integrated Peripherals option changes the values of the chipset
registers. These registers control system options in the computer.

Note: Change these settings only if you are familiar with the Chipset.

Run the Integrated Peripherals as follows.

1. Choose ÒIntegrated PeripheralsÓ from the Main Menu and the
following screen appears. (The screen below shows default
settings:)

ROM PCI/ISA BIOS

INTEGRATED PERIPHERALS

AWARD SOFTWARE, INC.

ESC : Quit ↑ ↓ → ←: Select Item
F1 : Help PU/PD/+/– : Modify
F5 : Old Values (Shift)F2 : Color
F6 : Load BIOS Defaults
F7 : Load Setup Defaults

OnChip IDE First Channel : Enabled
OnChip IDE Second Channel: Enabled
IDE Prefetch Mode : Enabled
IDE HDD Block Mode : Enabled
IDE Primary Master PIO : Auto
IDE Primary Slave PIO : Auto
IDE Secondary Master PIO : Auto
IDE Secondary Slave PIO : Auto
IDE Secondary Master UDMA: Auto
IDE Secondary Slave UDMA: Auto

Onboard FDC Controller : Enabled
Onboard UART 1 : 3F8/IRQ4
Onboard UART 2 : 2F8/IRQ3
Onboard UART 2 Mode : Standard

Onbaord Parallel Port : 378/IRQ7
Parallel Port Mode : ECP+EPP
ECP Mode Use DMA : 3
Parallel Port EPP Type : EPP1.9

2. Use the arrow keys to move between items and select values.
Modify selected fields using the PgUp/PgDn/+/Ð keys.

A short description of screen items follows:

On-chip IDE First
Channel/
On-chip IDE Second
Channel

Enabled Ð Use the on-board IDE

(default)

Disabled Ð Turn off the on-board IDE

IDE Prefetch Mode Use the default setting.

IDE HDD Block Mode Choose Enabled (default) or Disabled.

Enabled invokes multi-sector transfer
instead of one sector per transfer. Not all
HDDs support this function.

BIOS Setup 33

IDE Primary Master PIO/
IDE Primary Slave PIO/
IDE Secondary Master
PIO/
IDE Secondary Slave PIO

Choose Auto (default) or mode 0~4.
Mode 0 is the slowest speed, and HDD
mode 4 is the fastest speed. For better
performance and stability, we suggest
you use the Auto setting to set the HDD
control timing.

IDE Secondary Master
UDMA
IDE Secondary Slave
UDMA

Choose Auto (defautl) or Disabled.
When Auto is selected, it supports Ultra
DMA Mode.

Onboard FDC Controller Enabled Ð Use the on-board floppy

controller (default).

Disabled Ð Turn off the on-board

floppy controller.

Onboard UART 1/
Onboard UART 2

Choose serial port 1 & 2Õs I/O address.
Do no set port 1 & 2 to the same value
except for Disabled.

COM 1/3F8H | COM3/3E8H
COM 2/2F8H | COM4/2E8H
(default)

Onboard UART 2 Mode Standard Ð (default) supports a serial

infrared IrDA.

HPSIR Ð supports HP serial infrared

interface format

ASKIR Ð supports a Sharp serial

interface format.

IR Duplex Mode Use the default setting (Half). This

function shows up only when either
HPSIR or ASKIR is chosen in the
previous function (Onboard UART 2
Mode).

Onboard Parallel Port Choose the printer I/O address:

378H/IRQ7 (default), 3BCH/IRQ7,
278H/IRQ5

34 BIOS Setup

Parallel Port Mode Choose ECP + EPP (default), Normal

or EPP, ECP mode. The mode depends
on your external device that connects to
this port.

ECP Mode Use DMA Choose DMA3 (default) or DMA1.

This setting only works when the
Onboard Printer Mode is set at the ECP
mode.

Parallel Port EPP Type Choose EPP specification Ver. 1.7 or 1.9

(default).

Supervisor Password

Based on the setting you made in the ÒSecurity OptionÓ of the ÒBIOS
FEATURES SETUPÓ, this Main Menu item lets you configure the
system so that a password is required every time the system boots or an
attempt is made to enter the Setup program. Change the password as
follows:

1. Choose ÒSUPERVISOR PASSWORDÓ in the Main Menu and press
<Enter>. The following message appears:

ÒEnter Password:Ó

2. Enter a password and press <Enter>.
(If you do not wish to use the password function, you can just press
<Enter> and a ÒPassword disabledÓ message appears. )

3. After you enter your password, the following message appears
prompting you to confirm the new password:

ÒConfirm Password:Ó

4. Re-enter your password and then Press <ESC> to exit to the Main
Menu.

Important: If you forget or lose the password, the only way to access

the system is to set jumper JP5 to clear the CMOS RAM.
All setup information is lost and you must run the BIOS
setup program again.

BIOS Setup 35

User Password

Based on the setting you made in the ÒSecurity OptionÓ of the ÒBIOS
FEATURES SETUPÓ, this Main Menu item lets you configure the
system so that a password is required every time the system boots or an
attempt is made to enter the Setup program. Change the password as
follows:

1. Choose ÒUSER PASSWORDÓ in the Main Menu and press <Enter>.
The following message appears:

ÒEnter Password:Ó

2. Enter a password and press <Enter>.
(If you do not wish to use the password function, you can just press
<Enter> and a ÒPassword disabledÓ message appears. )

3. After you enter your password, the following message appears
prompting you to confirm the new password:

ÒConfirm Password:Ó

4. Re-enter your password and then Press <ESC> to exit to the Main
Menu.

5. You are not allowed to change any setting in ÒCMOS SETUP
UTILITYÓ except change userÕs password.

Important: If you forget or lose the password, the only way to access

the system is to set jumper JP5 to clear the CMOS RAM.
All setup information is lost and you must run the BIOS
setup program again.

36 BIOS Setup

IDE HDD Auto Detection

This Main Menu item automatically detects the hard disk type and
configures the STANDARD CMOS SETUP accordingly.

Note: This function is only valid for IDE hard disks.

ROM PCI/ISA BIOS

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

Do you accept this drive C (Y/N)? N

ESC : Skip

HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDZ SECTOR MODE
Primary Master : None 0 0 0 0 0 0 ----

Primary Slave : None 0 0 0 0 0 0 ---­Secondary Master : None 0 0 0 0 0 0 ---­Secondary Slave : None 0 0 0 0 0 0 ----

Appendix A

Jumper for Cyrix/IBM CPU (J100)

The SY-5EAS mainboa rd has a new jumper (J100) for better
per formance with Cyrix/IBM CP Us. Here is explaination
for you on how to use this jumper correctly.

l Lea ve J100 open when you want to install a non-Cyrix
/IBM CPU (default setting), or short J100 when you want to
install a Cyrix CPU.
If you use a Cyrix/IBM CPU, do the following steps :

(1) Press [DELETE] to enter BIOS setup menu during boot-up.

(2) Select “ Chipset Features Setup ”

(3) Set “Linear Burst” to “Enabled” then choose “SAVE &

EXIT SETUP”

Figure 1 Location of J100

Appendix B :

Quick Installation Guide

This leaflet is meant to help you set the jumpers for your 5EAS motherboard in
order to boot the motherboard. Please refer to Diagram 1 for the location of the
relevant jumpers:

Diagram 1: Board layout

Table 1 : Jumper settings for CPU voltage and frequency

Voltage Settings: JP32 (JP30, JP31) CPU frequency settings: JP10, 11, 12 / JP13, 14

voltage 1-2 3-4 5-6 7-8 JP30 JP31 frequency: JP10 JP11 JP12 multiplier JP13 JP14

single 3.52V
single 3.3V
dual 3.2V
dual 2.9V
dual 2.8V

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open open
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open open open

Table 2: Additional jumper settings

CMOS clear: J5 PCI bus synchronous / asynchronous:

J16

data (default)
Clear CMOS data

J100: Cyrix CPU linear burst enable Speaker: J18 Powerled: J17

Close this jumper when using a Cyrix CPU. Set the ‘linear burst’
item in the BIOS under ‘chipset features’ to enabled as well when
setting this jumper. (default setting is disabled)

1-2

2-3

note: Set JP16 to 2-3 when 75 Mhz bus
clock is selected, for 50 and 55 set 1-2.

open
open

close

close

close close

close

PCI bus: JP16Retain CMOS

synchronous 1-2

asynchronous 2-3

50 Mhz 2-3 2-3 2-3 1.5 / 3.5x open open

close

55 Mhz 2-3 2-3 1-2 2.0x

close

open 60 Mhz 1-2 2-3 2-3 2.5x
open 66 Mhz 2-3 1-2 2-3 3.0x open
open 75 Mhz 1-2 2-3 1-2

open

close
close close

close

Sleep Switch connector: J23

connect a switch to this jumper, Any

IRQ will wake up the system.

Reset: J19 HDD Led: J24

Connect the reset
button to J19

connect the speaker
to J18

connect the HDD
led to J24

connect keylock
& power led to
J17

Quick Installation Guide (continued)

Table 3 : Settings for various processors

SETTINGS CPU Frequency JP10, 11, 12 / JP 13, 14
processor bus clock multiplier JP10 JP11 JP12 JP13 JP14

AMD K5 PR75 50 Mhz 1.5x 2-3 2-3 2-3 open open
AMD K5 PR90 60 Mhz 1.5x 1-2 2-3 2-3 open open
AMD K5 PR100 66 Mhz 1.5x 2-3 1-2 2-3 open open
AMD K5 PR120 60 Mhz 1.5x 1-2 2-3 2-3 open open
AMD K5 PR133 66 Mhz 1.5x 2-3 1-2 2-3 open open
AMD K5 PR150 66 Mhz 1.5x 2-3 1-2 2-3 open open
AMD K5 PR166 66 Mhz 2.5x 2-3 1-2 2-3
AMD K6 PR166 66 Mhz 2.5x 2-3 1-2 2-3
AMD K6 PR200 66 Mhz 3x 2-3 1-2 2-3 open
AMD K6 PR233 66 Mhz 3.5x 2-3 1-2 2-3 open open
Cyrix 6x86(L) P133+ 55 Mhz 2.0x 2-3 2-3 2-3
Cyrix 6x86(L) P150+ 60 Mhz 2.0x 1-2 2-3 2-3
Cyrix 6x86(L) P166+ 66 Mhz 2.0x 2-3 1-2 2-3
Cyrix 6x86(L) P200+ 75 Mhz 2.0x 1-2 2-3 1-2
Cyrix MX PR166 60 Mhz 2.5x 1-2 2-3 2-3
Cyrix MX PR200 66 Mhz 2.5x 2-3 1-2 2-3
Cyrix MX PR233 75 Mhz 2.5x 1-2 2-3 1-2
Cyrix MX PR266 75 Mhz 3x 1-2 2-3 1-2 open
P54C P75 50 Mhz 1.5x 2-3 2-3 2-3 open open
P54C P90 60 Mhz 1.5x 1-2 2-3 2-3 open open
P54C P100 66 Mhz 1.5x 2-3 1-2 2-3 open open
P54C P120 60 Mhz 2.0x 1-2 2-3 2-3
P54C P133 66 Mhz 2.0x 2-3 1-2 2-3
P54C/P55C P150 60 Mhz 2.5x 1-2 2-3 2-3
P54C/P55C P166 66 Mhz 2.5x 2-3 1-2 2-3
P54C/P55C P180 60 Mhz 3x 1-2 2-3 2-3 open
P54C/P55C P200 66 Mhz 3x 2-3 1-2 2-3 open
P55C P233 66 Mhz 3.5x 2-3 1-2 2-3 open open

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New CPUs Update

If you have higher frequency CPU than above list, just follow the rules below
to set your CPUs.

CPU
Frequency

266 MHz 66MHz 4.0x 2-3 1-2 2-3 short open short
300 MHz 66MHz 4.5x 2-3 1-2 2-3 short short short

Bus clock Multi-

JP10 JP11 JP12 JP13 JP14 JP15

plier