Gigabyte GA-586DX User Manual

GA - 586DX

USER'S MANUAL

Dual PENTIUM PCI - ISA BUS MAINBOARD

REV. 1 Third Edition

GA-586DX

The author assumes no responsibility for any errors or omissions which may appear in this document nor does it make a commitment to update the information contained herein.

IBM PC/AT, PC/XT are trademarks of International Business Machine Corporation. PENTIUM is a trademark of Intel Corporation. AWARD is a trademark of Award Software, Inc. MS-DOS WINDOWS NT are registered trademarks of Microsoft Corporation. UNIX is a trademark of Bell Laboratories.

OCTOBER 01, 1996 Taipei, Taiwan

TABLE OF CONTENTS

Table of Contents

1. INTRODUCTION..................................................................................1-1

1.1. PREFACE.........................................................................................1-1

1.2. KEY FEATURES...............................................................................1-1

1.3. PERFORMANCE LIST.......................................................................1-2

1.4. BLOCK DIAGRAM .............................................................................1-3

1.5. INTRODUCE THE PCI - BUS.............................................................1-4

1.6. FEATURES.......................................................................................1-4

2. SPECIFICATION..................................................................................2-1

2.1. HARDWARE.....................................................................................2-1

2.2. SOFTWARE...................................................................................... 2-2

2.3. ENVIRONMENT................................................................................2-2

3. HARDWARE INSTALLATION...............................................................3-1

3.1. UNPACKING..................................................................................... 3-1

3.2. MAINBOARD LAYOUT......................................................................3-2

3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS...................3-2

3.4. DRAM INSTALLATION......................................................................3-4

3.5. CPU INSTALLATION AND JUMPERS SETUP...................................3-5

3.5.1 Uni-Processor Installation...........................................................3-5

3.5.2 Dual-Processor Installation.........................................................3-5

3.6. CMOS RTC & ISA CFG CMOS SRAM...............................................3-6

3.7. SPEAKER CONNECTOR INSTALLATION.........................................3-6

3.8. POWER LED & KEY LOCK CONNECTOR INSTALLATION ...............3-7

3.9. HARDWARE RESET SWITCH CONNECTOR INSTALLATION...........3-7

3.10. GREEN FUNCTION INSTALLATION ...............................................3-7

3.11. ATAPI DEVICE INSTALLATION.......................................................3-7

3.12. SCSI DEVICE INSTALLATION.........................................................3-7

3.13. PERIPHERAL DEVICE INSTALLATION........................................... 3-10

3.14. KEYBOARD & PS/2 MOUSE INSTALLATION..................................3-10

3.15. KEYBOARD SETTING FUNCTION..................................................3-10

4. BIOS CONFIGURATION......................................................................4-1

4.1. ENTERING SETUP...........................................................................4-1

4.2. CONTROL KEYS ..............................................................................4-2

GA-586DX

4.3. GETTING HELP................................................................................4-3

4.3.1. Main Menu..................................................................................4-3

4.3.2. Status Page Setup Menu / Option Page Setup Menu....................4-3

4.4. THE MAIN MENU.............................................................................. 4-3

4.5. STANDARD CMOS SETUP MENU....................................................4-5

4.6. BIOS FEATURES SETUP..................................................................4-9

4.7. CHIPSET FEATURES SETUP...........................................................4-13

4.8. POWER MANAGEMENT SETUP.......................................................4-14

4.9. PNP/PCI CONFIGURATION..............................................................4-16

4.10. INTEGRATED PERIPHERALS.........................................................4-17

4.11. LOAD SETUP DEFAULTS............................................................... 4-20

4.12. USER PASSWORD.........................................................................4-21

4.13. IDE HDD AUTO DETECTION..........................................................4-22

4.14. SAVE & EXIT SETUP......................................................................4-23

4.15. EXIT WITHOUT SAVING.................................................................4-24

5. AT TECHNICAL INFORMATION..........................................................5-1

5.1. I/O BUS CONNECTOR PIN OUT.......................................................5-1

5.1.1. ISA SLOT PIN OUT ....................................................................5-1

5.1.2. PCI - BUS SLOT PIN OUT..........................................................5-2

5.2. I/O & MEMORY MAP.........................................................................5-3

5.3. TIMER & DMA CHANNELS MAP.......................................................5-3

5.4. INTERRUPT MAP .............................................................................5-4

5.5. RTC & CMOS RAM MAP................................................................... 5-5

APPENDIX A: POST MESSAGE.................................................................A-1

APPENDIX B: POST CODES ......................................................................B-1

APPENDIX C: BIOS DEFAULT DRIVE TABLE............................................C-1

APPENDIX D: PROBLEM SHEET...............................................................D-1

Introduction

1. INTRODUCTION

1.1. PREFACE

Welcome to use the GA - 586DX motherboard. The motherboard is a 512 KB cache Dual PENTIUM Processor based PC / AT compatible system with ISA

bus and PCI Local Bus, and has been designed to be the fastest PC / AT system. There are some new features allow you to operate the system with just the performance you want.

This manual also explains how to install the motherboard for operation, and how to set up your CMOS CONFIGURATION with BIOS SETUP program.

1.2. KEY FEATURES

q Intel Dual Pentium q Supports Pentium processor,PODP running at 75-200 MHz,



Processor based PC / AT compatible mainboard.

Cyrix 6x86, and AMD 5k86 Processor.

q 4 Master / Slave PCI Bus slots, 4 ISA Bus slots. q Supports Dual 321 Pins (Socket 7) ZIF socket on board for Intel Processor,

and Dual POWER (2.8V/3.3V) Processor.

q Supports 512 KB Pipeline Burst Sync. 2nd Cache. q CPU L1 / L2 Write-Back cache operation. q Supports 8 - 512 MB DRAM memory on board. q Supports Adaptec Ultra & Wide SCSI ports for 15 SCSI Device. q Supports Adaptec RAID Port on board (Ver.3X and above version). q Supports 2 channels Enhance PCI IDE ports for 4 IDE Device. q Supports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port. q Supports Green function, Plug & Play function. q Licensed AWARD BIOS, FLASH EEPROM for BIOS update. q BENCHMARQ3287 / DALLAS 12887 / ODIN 12C887 RTC on board. q ATX form factor, 6 layers PCB.

1.3. PERFORMANCE LIST

1-1

GA-586DX

The following performance data list is the testing results of some popular benchmark testing programs. These data are just referred by users, and there is no responsibility for different testing data values gotten by users. (The different Hardware & Software configuration will result in different benchmark testing results.)

• CPU

Pentium processor 200 MHz

• DRAM 32 MB EDO

• CACHE SIZE 512 KB Pipeline Burst SRAM

• DISPLAY Matrox Millennium 2MB

• STORAGE Onboard IDE port + Quantum FB 1280AT IDE Dirve

Onboard SCSI port + Quantum XP 32150W SCSI Drive

• O.S. MS DOS V6.22

×DOSØ

Program Item Unit IDE SCSI LandMark Speed CPU MHz 1157.16 1157.16

FPU MHz 3355.77 3355.80 V2.0 VIDEO chr/ms 16384 16384 Norton System Info. CPU Index 635.3 635.3 V8.0 Disk Index 22.1 16.6 Core Test DATA Transfer Rate KB/S 14992 17072

Sequential Read KB/S 6288 7168 V.3.02 Random Read KB/S 2432 2336 PC BenchMark DOS Mark Index 1321.61 1796.00

CPU Mark16 Index 406.19 406.55 V9.0 Video Score Index 6351.57 6368.49

Disk Score Index 673.64 1172.86

× WINDOWSØ− with Display Driver at 1024 x 768 x 256 colors x 70Hz

Program Item Unit IDE SCSI Winbench 96 CPU Mark16 index 390 397

CPU Mark32 index 411 408 Disk Winmark95 KB/s 1370 1340 Graphics Winmark95 Mpixels/S 21.3 21.3

Winstone 96 Winstone96 Index 101.6 101.7

1-2

1.4. BLOCK DIAGRAM

Introduction

Host Bus

PCI Bus

Hard Disk

ISA Bus

Second Level

Cache

(SRAM)

Tag

Fast IDE

PIIX3CD ROM

Cntl

Tag Cntl TIO[7:0] TIO[10:8]

AIC-7880

Pentium Processor

3.3V

Addr Data

TXC

ECC Cntl

Control

Address/Data

Ultra SCSI

Ultra Wide SCSI

Adaptec RAID Port

Control

Address

Data

Main Memory (DRAM)

PCI

Device(s)

ISA

Device(s)

1.5. INTRODUCE THE PCI - BUS

1-3

GA-586DX

Connecting devices to a CPU local bus can dramatically increase the speed of I/O-bound peripherals with only a slight increase in cost over traditional systems.

This price / performance point has created a vast market potential for local bus products.

The main barrier to this market has been the lack of an accepted standard for local bus peripherals.

Many mainboard and chipset manufactures developed their own local bus implementations, but they are incompatible with each other.

The VL (Video Electronics Standards Association) local bus and PCI (Peripheral Component Interconnect) bus specification was created to end this confusion.

The PCI - bus standard, under development since Jun. 1992, which is designed to bring workstation-level performance to standard PC platform. The PCI - bus removes many of the bottlenecks that have hampered PC for several years.

On the PCI - bus, peripherals operate at the native speed of the computer system, thus enabling data transfer between peripherals and the system at maximum speed.

This performance is critical for bandwidth-constrained devices such as video, multimedia, mass storage, and networking adapters.

PCI - bus standard provides end-users with a low-cost, extendible and portable local bus design, which will allow system and peripherals from different manufactures to work together.

1.6. FEATURES

q 32 bits bus transfer mode. q Bus Master or Slave access. q Memory burst transfer to 132 MB/sec. q 33 MHz operation speed. q 10 device loading ability. q CPU independent.

1-4

2. SPECIFICATION

2.1. HARDWARE

• CPU

• COPROCESSOR

• SPEED

• DRAM MEMORY

• CACHE MEMORY

• SCSI PORTS

• I/O BUS SLOTS

• IDE PORTS

− Pentium

− AMD5

− Two 321 pins (socket 7) ZIF white socket on board.

− 3.3V / 2.8V Dual Power Ready for P55C,Cyrix &

AMD processor.

− Included in Pentium.

− 50 / 55 / 60 / 66 MHz system speed.

− 25 / 27.5 / 30 / 33 PCI-Bus speed.

− 7.5 / 8 MHz AT bus speed.

− Hardware and Software speed switchable function.

− 2 banks 72 pins SIMM module socket on board.

− Use 4 / 8 / 16 / 32 / 64 /128 MB 60~70 ns SIMM

module DRAM.

− 8 ~ 512 MB DRAM size.

− Support Fast Page / EDO DRAM access mode.

− 16 KB cache memory included in Pentium.

− 512 KB Pipeline Burst 2nd cache.

− Support Write Back cache function for both CPU &

on board cache.

− Using Adaptec 7880 Ultra Wide chipset.

− Supports one SCSI-2 or SCSI-3 (Ultra) port.

− Support one Wide or Ultra Wide port.

− Support Adaptec RAID Port on board.

− 4 Master / Slave PCI-BUS.

− 4 16 bits ISA BUS.

− 2 Enhanced IDE channels on board.

(Using IRQ14,15)



processor 75 - 200 MHz, P55C (Dual).



OverDrive processor, (PODP).

86, Cyrix6x86 processor.

Specification

2-1

GA-586DX

− Support Mode 3,4 IDE & ATAPI CD - ROM.

• I/O PORTS

− Supports 2 16550 COM ports. (Using IRQ4, 3)

− Supports 1 EPP/ECP LPT port. (Using IRQ7 or 5

and DMA3 or 1)

− Supports 1 1.44MB Floppy port. (Using DMA2 &

IRQ6)

− Supports PS/2 Mouse. (Using IRQ12 )

− Supports PS/2 Keyboard.

• GREEN FUNCTION

• BIOS

• DIMENSION

− Standby & Suspend mode support.

− Green switch & LED support.

− IDE & Display power down support.

− Monitor all IRQ / DMA / Display / I/O events.

− 128KB FLASH EEPROM.

− Supports Plug & Play Function.

− ATX Form Factor, 6 layers PCB.

2.2. SOFTWARE

• BIOS − Licensed AWARD BIOS.

− AT CMOS Setup, BIOS / Chipset Setup, Green

Setup, Hard Disk Utility included.

• O.S.

− Operation with MS-DOS

WINDOWS NT, OS/2, NOVELL and SCO UNIX.



, Windows95,

2.3. ENVIRONMENT

• Ambient Temp.

− 0°C to +50°C (Operating).

• Relative Hum. − 0 to +85% (Operating).

• Altitude − 0 to 10,000 feet (Operating).

• Vibration − 0 to 1,000 Hz.

• Electricity − 4.9 V to 5.2 V.

− 5 A to 7 A current.

2-2

Hardware Installation

3. HARDWARE INSTALLATION

3.1. UNPACKING

The mainboard package should contain the following:

• The GA - 586DX mainboard.

• USER'S MANUAL for mainboard & SCSI Driver Installation.

• Cable set for IDE, Floppy & SCSI device.

• Diskette for BUS MASTE IDE Driver & SCSI controller Drivers.

The mainboard contains sensitive electric components which can be easily damaged by static electricity, so the mainboard should be left in its original packing until it is installed.

Unpacking and installation should be done on a grounded anti-static mat. The operator should be wearing an anti static wristband, grounded at the same point as the anti-static mat.

Inspect the mainboard carton for obvious damage. Shipping and handling may cause damage to your board. Be sure there are no shipping and handling damages on the board before proceeding.

After opening the mainboard carton, extract the system board and place it only on a grounded anti-static surface component side up. Again inspect the board for damage. Press down on all of the socket IC's to make sure that they are properly seated. Do this only on with the board placed on a firm flat surface.

DO NOT APPLY POWER TO THE BOARD IF IT HAS BEEN DAMAGED.

You are now ready to install your mainboard. The mounting hole pattern on the mainboard matches the IBM-AT system board. It is assumed that the chassis is designed for a standard IBM XT/AT mainboard mounting.

Place the chassis on the anti-static mat and remove the cover. Take the plastic clips, Nylon stand-off and screws for mounting the system board, and keep them separate.

3.2. MAINBOARD LAYOUT

3-1

GA-586DX

PCI3

COMB LPT Keyboard Mouse COMA

CN1

PCI1

CN6

CN2 CN3 CN4 CN5

POWER CONN. FLOPPY

1st CPU

Socket

2nd CPU

Socket

U10

PCI4

AIC-7880

SCSI

OFF

JP15

GA-586DX

J3 J4 J5 J6 J7 J8 J9

1 1 1 1

+ + +

PCI2

RAID Port

1 234

DIP SWITCH

CN10

CN11

DRAM Bank0,1

WIDE SCSI

ULTRA SCSI

IDE 1st

IDE 2nd

+12V GND

J1:CPU FAN

+12V GND

J2:CPU FAN

CN8

CN9

×Figure 3.1Ø

3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS

t J1,2: CPU cooling FAN Power Connector

1 +12V 2 GND

t J3: SPEKER Connector

Pin No. Function

1 VCC 2 NC. 3 NC. 4 Output

t J4: RESET Switch (RST)

Pin No. Function

1 RESET Input 2 GND

t J5: POWER ON LED (PW-LED)

Pin No. Function

CN7

P.B.

SRAM

P.B.

SRAM

3-2

1 LED POWER (+) 2 NC 3 GND (-)

t J6: Hard Disk active LED

Pin No. Function

1 LED POWER (+) 2 LED POWER (-) 3 LED POWER (-) 4 LED POWER (+)

t J7: INFARED Connector (IR) -- Function Option

Pin No. Function

1 IR Data Output 2 GND 3 IR Data Input 4 NC 5 POWER (+)

t J8: GN-SW

Pin No. Function

Close Force system to enter Green Mode (Suspend mode). Open Normal Operation.

t J9: GN-LED

Pin No. Function

1 LED anode (+). 2 LED cathode (-).

Hardware Installation

t S1: System Speed Selection

1 2 Function ON ON For 50 MHz system speed ( CPU 75, 100(x2), PODP 125 MHz ). ON OFF For 60 MHz system speed ( CPU 90, 120, 150, 180 MHz ).

OFF ON For 66 MHz system speed ( CPU 100, 133, 166, 200 MHz ). OFF OFF For 55 MHz system speed ( CPU 110 MHz ).

t S1: CPU INT. / EXT. FREQ. RATIO

3 4 OFF OFF x 1.5 OFF ON x 2

ON ON x 2.5 ON OFF x 3

t JP15: Wide SCSI port High Byte Terminator ON/OFF

Pin No. Function

Open High Byte Terminator always Enable (ON). Close High Byte Terminator ON/OFF control by software.

3-3

GA-586DX

t CN1-11 I/O Ports Connector

CN1 For Serial port2 (COM B). CN2 For LPT port. CN3 For Keyboard I/O port. CN4 For PS/2 Mouse port. CN5 For Serial port1(COM A). CN6 USB port (option). CN7 For Floppy port CN8 For ULTRA WIDE SCSI port.

CN9 For ULTRA 8 bit SCSI port. CN10 For Secondary IDE port. CN11 For Primary IDE port.

t Power Connector

Pin No. Function

1 Power Good signal

2,10,11,12 VCC (+5V)

3 +12V 4 -12V

5,6,7,8 GND

9 -5V

t Adaptec RAID Port The port is for Adaptec PCI RAID Port card ARO-113X, just Plug & Play will Enable

onboard SCSI controller to perform as SCSI RAID channels.

3.4. DRAM INSTALLATION

The mainboard can be installed with 4 / 8 / 16 / 32 / 64 / 128 MB 72 pins SIMM module DRAM, and the DRAM speed must be 60 or 70 ns.

The DRAM memory system on mainboard consists of bank 0 & bank 1. Each bank consist of 2 PCs 72 pins SIMM module DRAM.

Because the 72 pins SIMM module is 32 bits width, using 2 PCs which can match a 64 bits system.

The total memory size is 8 - 512 MB, and various configuration of DRAM types in the following TABLE are for reference:

Bank0 Bank1 Single: Single bank SIMM Module Single None Ex. 4MB, 16MB, 64MB Single Single Single Double Double: Double banks SIMM Module Double None Ex. 8MB, 32MB, 128MB

3-4

Hardware Installation

CLK.

Double Single Double Double

The DRAM installation position refer to Figure 3.1, and notice the Pin 1 of SIMM module must match with the Pin 1 of SIMM socket when the DRAM SIMM module is installed.

Insert the DRAM SIMM module into the SIMM socket at 45 degree angle. If there is a wrong direction of Pin 1, the DRAM SIMM module couldn't be inserted into socket completely.

After completely insert SIMM module into socket, then press the SIMM module in vertical direction until the left and right metal holders can keep the SIMM module standing up con-firmly.

3.5. CPU INSTALLATION AND JUMPERS SETUP

3.5.1 Uni-Processor Installation

The system's speed depends on the frequency of CLOCK GENERATOR. The user can change the DIP SWITCH (S1) selection to set up the system speed to 50 MHz, 55 MHz, 60 MHz or 66 MHz for 75 - 200 MHz processor.

The mainboard can use Intel Pentium Processor, P55C or PODP ( Pentium OverDrive Processor - P54CT, P54CTB), Cyrix 6x86 AND

AMD 5k86 processor. The CPU speed must match with the frequency of CLOCK GEN. It will cause

system hanging up if the CLOCK GEN.'S frequency is higher than CPU's. There are two CPU socket onboard, the user can install CPU to any one

socket, but 1st CPU socket is recommanded for one processor configuration.

3.5.2 Dual-Processor Installation

The mainboard provide Intel Multi-processor specification, so only Intel Pentium Processor can be used when Dual Processor configuration is

achieved. The two processor must used same speed and same type (Ex. P54C or

P55C). CPU Installation Table:

DIP SWITCH (S1)

INT.CLK. CPU SPEED

EXT.

1 2 3 4 RATIO MHz MHz

ON ON OFF OFF 1.5 50 75 PENTIUM 75 MHz, AMD5K86-P75

ON OFF OFF OFF 1.5 60 90 PENTIUM 90 MHz, AMD5K86-P90/P120

3-5

GA-586DX

OFF ON OFF OFF 1.5 66 100

ON ON OFF ON 2 50 100 Cyrix 6X86-P120

OFF OFF OFF ON 2 55 110 Cyrix 6X86-P133

ON OFF OFF ON 2 60 120 PENTIUM 120 MHz, AMD5K86-P150, Cyrix 6X86-P150

OFF ON OFF ON 2 66 133

ON ON ON ON 2.5 50 125 Intel PODP 125MHz

ON OFF ON ON 2.5 60 150 PENTIUM 150 MHz

OFF ON ON ON 2.5 66 166 PENTIUM 166 MHz

ON OFF ON OFF 3 60 180 PENTIUM 180 MHz

OFF ON ON OFF 3 66 200 PENTIUM 200 MHz

The CPU is a sensitive electric component and it can be easily

PENTIUM 100 MHz, AMD5K86-P100/P133

PENTIUM 133 MHz, AMD5K86-P166, Cyrix 6X86-P166

damaged by static electricity, so users must keep it away from metal surface when the CPU is installed onto mainboard.

3.6. CMOS RTC & ISA CFG CMOS SRAM

There're RTC & CMOS SRAM on board, they have a power supply from internal battery to keep the DATA inviolate & effective.

The RTC is a REAL-TIME CLOCK device which provides the DATE & TIME to system.

The CMOS SRAM is used for keeping the information of ISA device system configuration, so the system can automatically boot OS. every time.

Due to the life-time of RTC internal battery is 5 years, the user can change a new RTC to replace old one after it can not work.

The new one's brand and type must be same with old one.

3.7. SPEAKER CONNECTOR INSTALLATION

There is always a speaker in AT system for sound purpose. The 4 - Pins connector J3 is used to connect speaker.

The speaker can work well in both direction of connector when it is installed to the connector J3 on mainboard.

3.8. POWER LED & KEY LOCK CONNECTOR INSTALLATION

There are a system power LED lamp on the panel of case. The power LED will light on when system is powered-on, which is connected to a 3 PIN connector. The connector should be connected to J5 of mainboard in correct direction.

3.9. HARDWARE RESET SWITCH CONNECTOR INSTALLATION

3-6

Hardware Installation

The RESET switch on panel provides users with HARDWARE RESET function which is almost the same as power-on/off. The system will do a cold start after the RESET switch is pushed and released by user. The RESET switch is a 2 PIN connector and should be installed to J4 on mainboard.

3.10. GREEN FUNCTION INSTALLATION

For the purpose of power saving, there are two jumpers, J8 and J9, to make sure the power saving function doing well. The J9 is a indicator (green LED) for green function. If the green LED is ON, the system is operating in green mode. The J8 is a switch to force the system get into green mode immediately.

3.11. ATAPI DEVICE INSTALLATION

There are two Enhance PCI IDE ports (CN10,11) on board, which following ATAPI standard SPEC. Any one IDE port can connecte to two ATAPI devices (IDE Hard Disk, CD-ROM & Tape Driver), so total four ATAPI devices can exist in a system.

The booting Hard Disk should be the Master device of 1st IDE channel.

3.12. SCSI DEVICE INSTALLATION

There are two SCSI ports on board, One is 8bit SCSI port for SCSI-2 or ULTRA SCSI device, and total 7 8bit SCSI devices can exist in a system.

The other is 16bit SCSI port for wide or ULTRA Wide SCSI device, and total 15 SCSI devices (include 8bit SCSI device) can exist in a system.

The low byte Terminator (used for 8bit SCSI port) turning "ON" or "OFF" is controled by software (SCSI BIOS SETUP Utility), and High byte Terminaator (used for Wide SCSI port) turning ON or OFF can be controled by JP15 as following:JP15 OPEN: High byte Terminator is always enable (ON)

JP15 CLOSE:High byte Terminator is controled by software SCSI

BIOS SETUP (same status as Low byte Terminator).

Terminator ON/OFF rules CASE 1: High byte-ON (JP15 OPEN)

Low byte-ON (SCSI BIOS SETUP Enabled)

3-7

GA-586DX

1 System has 16 bit SCSI

Mainboard

Terminator ON Terminator OFF Terminator ON

2 System has only 8 bit SCSI device

Mainboard

Terminator ON Terminator OFF

3 System has EXT. SCSI port but has not INT. SCSI device

EXT. SCSI Terminator

EXT. SCSI DEVICE

Terminator ON Terminator ON

16 bit 16 bit

SCSI DEVICE SCSI DEVICE

SCSI ID SCSI ID

No.15 No.0

8 bit 8 bit

SCSI DEVICE SCSI DEVICE

SCSI ID SCSI ID

No.6 No.0

EXT. 50pin or 68pin SCSI port

EXT. SCSI port

Terminator ON

Mainboard

CASE 2:High byte-ON(JP15 OPEN), Low byte-OFF(SCSI BIOS SETUP Disabled)

1 System has 16 bit & 8 bit SCSI device

16 bit

SCSI DEVICE

16 bit

SCSI DEVICE

8 bit

SCSI DEVICE

8 bit

Mainboard

Terminator OFFTerminator ON

High byte Terminator ON Low byte Terminator OFF

Terminator OFF Terminator ON

3-8

2 System has 8 bit EXT. SCSI port & 8 bit INT. SCSI device

SCSI-2 Terminator

EXT. 50pin SCSI port

Hardware Installation

8 bit

SCSI DEVICE SCSI DEVICE

SCSI ID SCSI ID

8 bit

EXT. SCSI-2 DEVICE

Terminator ON Terminator OFF Terminator ON

3 System has 8 bit EXT. SCSI port & 16 bit INT. SCSI device

SCSI-2 Terminator

EXT. SCSI-2 DEVICE

Terminator ON Terminator OFF Terminator ON

4 System has 16 bit EXT. SCSI port & 8 bit INT. SCSI device

WIDE SCSI Terminator

EXT. WIDE SCSI DEVICE

Terminator ON Terminator OFF Terminator ON

EXT. 50pin SCSI port

Mainboard

High byte Terminator ON Low byte Terminator OFF

Mainboard

High byte Terminator ON Low byte Terminator OFF

Mainboard

High byte Terminator ON Low byte Terminator OFF

No.6 No.0

16 bit

SCSI DEVICE SCSI DEVICE

SCSI ID SCSI ID

No.15 No.0

8 bit

SCSI DEVICE SCSI DEVICE

SCSI ID SCSI ID

No.6 No.0

16 bit

8 bit

CASE 3: High byte-OFF (JP15 CLOSE)

Low byte-OFF (SCSI BIOS SETUP Disabled)

1 System has 16 bit EXT. SCSI port & INT. 16 bit SCSI device

WIDE SCSI Terminator

EXT. 68pin SCSI port

16 bit

SCSI DEVICE SCSI DEVICE

SCSI ID SCSI ID

16 bit

EXT. WIDE SCSI DEVICE

Terminator ON Terminator OFF Terminator ON

Mainboard

High byte Terminator OFF Low byte Terminator OFF

No.15 No.0

3-9

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