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G586OPC
Rev. 0 +
System Board
User’s Manual

- D28450828 -

v Copyright1995byDFI,Inc.
All rights reserved.
No part of this document may be copied, reproduced in
any form or by any means or used to make any transformation/adaptation without the prior written consent
of DFI, Inc.
DFI, Inc. makes no warranties with respect to this
documentation and disclaims any implied warranties of
merchantability, quality, or fitness for any particular
purpose. The information in this document is subject to
change without notice. DFI, Inc. reserves the right to
make revisions to this publication and to make changes
to any and/or all parts of its content, at any time,
without obligation to notify any person or entity of such
changes. Further, DFI, Inc. assumes no responsibility
for any errors that may appear in this document.
DFI is a registered trademark, and G586OPC is a
trademark of Diamond Flower, Inc. All other product
names mentioned are trademarks or registered trademarks of their respective companies.

v FCC Statement on Class B
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is operated in a residential
installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may
cause harmful interference to radio communications.
However, there is no guarantee that interference will
not occur in a particular installation. If this equipment
does cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
the receiver.
• Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio TV
technician for help.
Notice:
1. The changes or modifications not expressly
approved by the party responsible for compliance
could void the user's authority to operate the
equipment.
2. Shielded interface cables must be used in order to
comply with the emission limits.

v Table of Contents v
Introduction .............................................................................. 1
Features and Specifications ......................................... 2
Package Checklist ........................................................ 5
Installation Overview ............................................................... 6
Preparing the Area .............................................................. 6
Handling the System Board ................................................ 7
Tips in Handling the System Board .............................. 7
Hardware Installation ........................................................... 8
Memory Installation ....................................................... 8
Installing the Modules ............................................ 11
Board Configuration ...................................................... 12
Jumper Settings for Display Type and
CMOS Clean .......................................................... 13
Jumper Settings for Super I/O Setting .................. 15
Cache Configuration ..................................................... 17
Installing Asynchronous SRAM ............................. 17
Jumper Settings for Cache Memory ............... 19
256KB Cache SRAM ................................ 20
512KB Cache SRAM ................................ 22
1MB Cache SRAM ................................... 24
Installing the Synchronous Cache Module ..... 26
Jumper Settings ........................................ 26
Installation ................................................. 27
VRM Header ................................................................. 29
VRM Header and 3.3V Pentium Processor ........... 29
VRM Header and Future Low-Voltage CPUs ........ 30
CPU Installation ............................................................ 31
Jumper Settings for CPU ....................................... 32
Jumpers JP3, JP4, JP9, JP10, JP18, JP19, JP20
JP21 and JP24 ............................................................. 41
Installing Upgrade CPUs .............................................. 42

Built-in Ports ........................................................................ 47
Serial Ports ................................................................... 48
PS/2 Mouse Port ........................................................... 49
Parallel Port .................................................................. 50
Floppy Disk Drive Connector ........................................ 51
IDE Hard Disk Interface ................................................ 53
Installing Expansion Cards .................................................. 56
Installing the System Board ................................................ 58
IDE Device Drivers .............................................................. 60
Troubleshooting Checklist ..................................................... 61
Appendix A: PCI I/O Pin Assignments .................................. 62
Appendix B: ISA I/O Pin Assignments .................................. 63
Appendix C: Connector Pin Assignments ............................ 64

PCI/ISA System Board

v Introduction
The G586OPC system board offers several advanced
features integrated into the system board. Its design is
based on the new Peripheral Component Interconnect
(PCI) local bus and Industry Standard Architecture
(ISA) standards.
The G586OPC provides a 321-pin Zero Insertion Force
(ZIF) CPU socket for PentiumTM processors running at
75MHz, 90MHz, 100MHz, 120MHz, 133MHz or
150MHz frequency. This ZIF socket allows users to
easily upgrade their CPUs. It also provides a VRM
(Voltage Regulation Module) header allowing you to
upgrade to future low-voltage CPUs.
The G586OPC is equipped with three PCI slots, three
ISA slots and one shared PCI/ISA slot.
The G586OPC board has two bus master PCI IDE
connectors. Bus mastering reduces CPU use during disk
transfer. The system board is also equipped with two
NS16C550A-compatible serial ports, an SPP/EPP/ECP
parallel port, a floppy disk drive controller, one PS/2
mouse port and one PS/2 keyboard connector.
The G586OPC can support 2MB to 128MB of memory
using 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and
8Mx36 72-pin SIM modules.

G586OPC

Features and Specifications
Processor
• Intel PentiumTM 75/90/100/120/133/150MHz
• Future Pentium Processor and Pentium OverDrive
Processor
Chipset
• OPTI Viper-M chipset
Energy Efficient Design
• Supports System Power Management
• CPU stopped clock control
• Hardware supports SMI green mode
• Microsoft/Intel APM 1.1 compliant
Two Bus Master PCI IDE Connectors
• PIO Modes 3 & 4 Enhanced IDE (data transfer rate
up to 16.6MB/sec)
• DMA Mode 2 Bus Master IDE (data transfer rate
up to 22.2MB/sec)
• Bus mastering reduces CPU use during disk
transfer
• ATAPI IDE CD-ROM supported
Integrated I/O
• Super I/O controller: SMC FDC37C665GT,
SMC FDC37C669GT or
UMC8669
• Two NS16C550A-compatible high speed UARTs
• One SPP/EPP/ECP parallel port
• One 720KB/1.2MB/1.44MB/2.88MB floppy
controller
• PS/2 mouse port
• PS/2 keyboard connector or AT keyboard
connector
2

PCI/ISA System Board

BIOS
• Award Plug & Play BIOS
• Supports Enhanced IDE devices
• Supports Enhanced IDE HDDs larger than 528MB
(LBA mode only)
Architecture
• PCI/ISA
Cache
• 256KB, 512KB or 1MB direct map write-back or
write-through cache
• 32Kx8, 64Kx8 or 128Kx8 asynchronous SRAM
(supports 5V/3.3V mixed voltage SRAM)
• 160-pin cache module upgrade slot for optional
synchronous pipeline burst cache module
Memory
• 2MB to 128MB onboard memory
• Four 72-pin SIMM sockets
• Supports single and/or double density SIMMs
• 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 or
8Mx36 parity SIMMs
• x32 non-parity SIMMs supported
• Supports 60ns or 70ns fast page mode DRAM or
EDO DRAM
Expansion Slots
• Three dedicated PCI slots
• One shared PCI/ISA slot
• Three dedicated 16-bit ISA slots
With the optional synchronous pipeline burst
cache module installed in the 160-pin cache
module upgrade slot, the length of the add-in card
in PCI Slot 2 is limited to 124,65 mm.
3

G586OPC

VRM and ZIF Sockets
• VRM (Voltage Regulation Module) header
allows upgrade to future low-voltage CPUs
• 321-pin ZIF socket (Intel Socket 7)
Board Dimensions
• 28cm (11.02") x 22cm (8.58")

PCI/ISA System Board

Package Checklist
The G586OPC package contains the following items:
•
•
•
•
•
•
•

The G586OPC system board
The G586OPC user’s manual
One set of IDE driver diskettes
One 34-pin floppy disk drive cable
Two 40-pin IDE hard disk cables
One 25-pin printer port cable for chassis mounting
One card-edge bracket with serial and mouse port
cables

If any of these items is missing or damaged, please
contact your dealer or sales representative for assistance.

G586OPC

v Installation Overview
This chapter summarizes the steps in installing the
G586OPC system board into your system unit. It also
includes a description of the area in which you must
work and directions for memory installation. Before
installing the system board, obtain the memory you plan
to install. Please refer to the memory chart, on pages 8
and 9, for the number and type of SIM modules
needed for the amount of memory you require.

Preparing the Area
Before unpacking the system board, make sure the
location you have selected is relatively free of dust and
static electricity. Excessive exposure to dust, static
electricity, direct sunlight, excessive humidity, extreme
cold, and water can damage the operational capabilities
of your system board. Avoid placing the unit on surfaces
such as carpeted floors. These areas attract static electricity which can damage some circuits on your system
board.
Make sure the power source has a properly grounded,
three-pronged socket. It is essential that the power
connection be properly grounded for correct functioning
of your system board. For further protection, we recommend that you use a surge suppressor. This will protect
the system board from damage that may result from a
power surge on the electrical line.
Move items that generate magnetic fields away from
your system board, since magnetic fields can also
damage your system board. Once you have selected the

PCI/ISA System Board

ideal location, unpack the G586OPC system board
carefully.

Handling the System Board
It is quite easy to inadvertently damage your system
board even before installing it to your system unit.
Static electrical discharge can damage computer components without causing any signs of physical damage.
You must take extra care in handling the system board
to ensure against electrostatic build-up.

Tips in Handling the System Board
1. To prevent electrostatic build-up, leave the board in
its anti-static bag until you are ready to install it.
2. Wear an antistatic wriststrap.
3. Do all preparation work on a static-free surface with
components facing up.
4. Hold the system board by its edges only. Be careful
not to touch any of the components, contacts or
connections, especially gold contacts on the board.
5. Avoid touching the pins or contacts on all modules
and connectors. Hold modules and connectors by
their ends.
Warning:
Electrostatic discharge (ESD) can damage your upgrade
processor, disk drives, add-in boards, and other
components. Perform the upgrade instruction
procedures described at an ESD workstation only. If
such a station is not available, you can provide some
7

G586OPC

ESD protection by wearing an antistatic wrist strap and
attaching it to a metal part of the system chassis. If a
wrist strap is unavailable, establish and maintain
contact with the system chassis throughout any
procedures requiring ESD protection.

Hardware Installation
Memory Installation
The G586OPC system board can support 2MB to
128MB of memory using 72-pin SIMMs (Single In-Line
Memory Module).
The SIMM sockets are divided into two banks on the
system board. The G586OPC system board uses
256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and
8Mx36 SIMMs. Non-parity (x32) SIMMs can also be
used if parity checking is turned off in CMOS setup.
You will need 2 or 4 pieces of SIMMs, depending on
the amount of memory you intend to install.
To install the SIM modules, first populate Bank 0 and
then Bank 1, or the system will not work.
The table on the next page summarizes the bank locations and modules needed for the corresponding memory
sizes. Each bank consists of 2 SIMM sockets.

PCI/ISA System Board

MemorySize Bank0
2MB
4MB
4MB
8MB
8MB
16MB
16MB
32MB
32MB
48MB
64MB
64MB
68MB
72MB
80MB
96MB
128MB

256Kx36
256Kx36
512Kx36
512Kx36
1Mx36
1Mx36
2Mx36
2Mx36
4Mx36
2Mx36
4Mx36
8Mx36
512Kx36
1Mx36
2Mx36
4Mx36
8Mx36

Bank1
256Kx36
512Kx36
1Mx36
2Mx36
4Mx36
4Mx36
8Mx36
8Mx36
8Mx36
8Mx36
8Mx36

G586OPC

VRM Header
Pin 1 of the SIMM socket

Locations of the SIM Sockets on the System Board

PCI/ISA System Board

Installing the Modules
A SIMM simply snaps into a socket on the system
board. Pin 1 of the SIMM must correspond with Pin 1
of the socket.

1. Position the SIMM above the socket with the
“notch” in the module aligned with the “key” on the
socket.
2. Seat the module at a 45o angle into the bank. Make
sure it is completely seated. Tilt the module upright
until it locks in place in the socket.

G586OPC

Board Configuration
The G586OPC has jumpers and connectors onboard.
Make sure the jumpers are set correctly before installing
the system board into your system unit.
HJ1
J2

PCI/ISA System Board

Jumper Settings
Jumper Settings for Display Type and CMOS Clean

Locations of Jumpers JP1 and JP11 on the
G586OPC System Board

G586OPC

Jumper JP1
Display Type Select
Jumper JP1 sets the display adapter to color or mono.
This jumper must match the type of display adapter
installed. If you change your video adapter, make sure
this jumper is changed accordingly.

JP1 Off: Color
(Default)

JP1 On: Mono

Jumper JP11
CMOS Clean Select
If, for some reason, the CMOS becomes corrupted, the
system can be reconfigured with the default values
stored in the ROM BIOS. To load the default values,
switch off your computer and remove the cover. Touch
the power supply box to discharge any static electric
buildup in your body. Set JP11 to On for approximately
5 seconds, then return to the default position (Off). Put
the cover back and power up your system.

JP11 Off: Normal
(Default)

JP11 On: CMOS
Clean

PCI/ISA System Board

Jumper Settings for Super I/O Setting

Locations of Jumpers JP5 and JP6
on the G586OPC System Board

G586OPC

Jumper JP5
ECP DRQ Select
The G586OPC system board supports an ECP parallel
port that allows you to use DMA Request (DRQ) Channel 1 or 3. Set Jumper JP5 so the ECP port does not
conflict with an add-on card's DMA channel.
1

1-2 On: ECP DRQ 3
(Default)

2-3 On: ECP DRQ 1

Jumper JP6
ECP DACK Select
The G586OPC system board supports an ECP parallel
port that allows you to use DMA Acknowledge (DACK)
Channel 1 or 3. Set Jumper JP6 so the ECP port does
not conflict with an add-on card's DMA channel.
1

2-3 On: ECP DACK 3
(Default)

1-2 On: ECP DACK 1

PCI/ISA System Board

Cache Configuration
The G586OPC system board can support either asynchronous cache SRAM or synchronous (pipelined
burst) cache SRAM. Three cache sizes are supported:
256KB, 512KB and 1MB. 256KB is the default size.

Installing Asynchronous Cache SRAM
The SRAM sockets allow you to install either 32Kx8,
64Kx8 or 128Kx8 SRAM. Regardless of the amount of
cache memory installed, one 32Kx8 (U23) is needed for
tag RAM to store the cacheable addresses. The locations
of the SRAM sockets on the system board are shown on
the next page.

SRAM Socket

G586OPC

Pin 1 of the SRAM
socket

PCI/ISA System Board

Jumper Settings for Cache Memory

Locations of Jumpers JP12, JP13, JP14, JP15, JP22 and
JP23 on the G586OPC System Board

G586OPC

32Kx8 (TAG)

256KB Cache SRAM *
5V/3V Mixed Voltage SRAM

U23
(5V SRAM)

JP12
1
2
3

1 2 3

JP13
JP14
JP15

U30

32Kx8

U33 U32 U31

32Kx8

U34

32Kx8

U35

32Kx8

JP23

32Kx8

JP22

U29 U28

* Default Setting

PCI/ISA System Board

32Kx8 (TAG)

256KB Cache SRAM
3.3V SRAM
U23
(5V SRAM)

JP12
1
2
3

1 2 3

JP13
JP14
JP15

U30

32Kx8

U33 U32 U31

32Kx8

U34

32Kx8

U35

32Kx8

JP23

32Kx8

JP22

U29 U28

G586OPC

32Kx8 (TAG)

512KB Cache SRAM
5V/3.3V Mixed Voltage SRAM
U23
(5V SRAM)

JP12
1
2
3

1 2 3

JP13
JP14
JP15

U30

64Kx8

U33 U32 U31

64Kx8

U34

64Kx8

U35

64Kx8

JP23

64Kx8

JP22

U29 U28

PCI/ISA System Board

32Kx8 (TAG)

512KB Cache SRAM
3.3V SRAM
U23
(5V SRAM)

JP12
1
2
3

1 2 3

JP13
JP14
JP15

U30

64Kx8

U33 U32 U31

64Kx8

U34

64Kx8

U35

64Kx8

JP23

64Kx8

JP22

U29 U28

G586OPC

32Kx8 (TAG)

1MB Cache SRAM
5V/3.3V Mixed Voltage SRAM
U23
(5V SRAM)

JP12
1
2
3

1 2 3

JP13
JP14
JP15

U30

128Kx8

U33 U32 U31

128Kx8

U34

128Kx8

U35

128Kx8

JP23

128Kx8

JP22

U29 U28

PCI/ISA System Board

32Kx8 (TAG)

1MB Cache SRAM
3.3V SRAM
U23
(5V SRAM)

JP12
1
2
3

1 2 3

JP13
JP14
JP15

U30

64Kx8

U33 U32 U31

64Kx8

U34

64Kx8

U35

64Kx8

JP23

64Kx8

JP22

U29 U28

G586OPC

Installing the Synchronous Cache Module
Jumper Settings
JP12

JP13

JP14

JP15

1
2
3

1 2 3

Note:
Jumpers JP22 and JP23 are used to select the Level 2
asynchronous cache size. These two jumpers can be
ignored when installing the optional synchronous cache
module.

PCI/ISA System Board

Installation
1. Before installing the optional synchronous pipeline burst
cache module, make sure that:
- the cache chips have been removed from the
SRAM sockets U23 (Tag RAM) and U28-U35;
- Jumpers JP12-JP15 have been set properly (page
26).
2. Locate the 160-pin cache module slot on the system
board. Position the cache module above the slot. Make
sure pin 1 of the cache module is aligned with pin 1 of
the slot. Carefully slide the module into the slot. Press
firmly on the top of it to seat it properly.
Note:
With the optional synchronous pipeline burst cache
module installed in the cache module slot, the length of
the add-in card in PCI Slot 2 is limited to 124,65 mm.

G586OPC

3. Once the synchronous cache module has been installed,
you should make the following modifications in the
“Chipset Features Setup” menu of the Award BIOS
CMOS Setup Utility.
1.
2.
3.
4.

SRAM Type:
SYNC SRAM Support:
Cache Read Burst:
Cache Write Burst:

Sync
Pipeline
3-1-1-1
3-1-1-1 or 4-1-1-1

PCI/ISA System Board

VRM Header
Your G586OPC system board is equipped with a VRM
(Voltage Regulation Module) header shown below. It
allows you to upgrade to future low-voltage CPUs by
installing a Voltage Regulation Module.

VRM Header on the System Board
VRM Header and 3.3V Pentium Processor
When using a 3.3V Pentium processor, pins 4-5, 6-7,
19-20 and 21-22 of the VRM header must be set to On.
These settings are presented on the next page.

G586OPC

Pins 4-5, 6-7, 19-20 and 21-22 are set to On
VRM Header and Future Low-Voltage CPUs
The types of VRM supported and installation procedures
will be described in a future edition of the G586OPC
manual.

PCI/ISA System Board

CPUInstallation
The G586OPC is equipped with a 321-pin Zero
Insertion Force (ZIF) socket at location U26 of the
system board. The ZIF socket allows for easy
installation of upgrade CPUs as your system needs
grow. Make sure all jumpers are set correctly before
applying power, or you may damage the CPU or system
board.

Pin 1 of the ZIF socket
U26

Location of the ZIF Socket on the System Board
31

G586OPC

Jumper Settings for CPU

Locations of Jumpers JP7, JP8, JP16 and JP17
on the G586OPC System Board

PCI/ISA System Board

3.3V Pentium Processor (75MHz)
System (External) Bus Speed: 50MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

G586OPC

3.3V Pentium Processor (90MHz) *
System (External) Bus Speed: 60MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1
* Default Setting

PCI/ISA System Board

3.3V Pentium Processor (100MHz)
System (External) Bus Speed: 50MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

G586OPC

3.3V Pentium Processor (100MHz)
System (External) Bus Speed: 66MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

PCI/ISA System Board

3.3V Pentium Processor (120MHz)
System (External) Bus Speed: 60MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

G586OPC

3.3V Pentium Processor (133MHz)
System (External) Bus Speed: 66MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

PCI/ISA System Board

3.3V Pentium Processor (150MHz)
System (External) Bus Speed: 50MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

G586OPC

3.3V Pentium Processor (150MHz)
System (External) Bus Speed: 60MHz
JP7
JP8

JP16
1 2 3

JP17

3.3V Pentium
Processor

Pin 1

PCI/ISA System Board

JumpersJP3,JP4,JP9,JP10,JP18,JP19,JP20,JP21andJP24

The following jumpers are for factory testing only and
should always be set to their default configurations.
Reconfiguring these jumpers will cause problems with
your system board.
JP3: Off
JP4, JP24: 1-2 On
JP9, JP10, JP18, JP19, JP20, JP21: On
41

G586OPC

Installing Upgrade CPUs
The G586OPC is equipped with a 321-pin Zero
Insertion Force (ZIF) socket at location U26 of the
system board. This socket is designed for easy removal
of the old CPU and easy insertion of the upgrade CPU.
The socket allows you to carefully place the new CPU
into its position. If you need to apply excessive force to
insert the CPU, the installation is being done incorrectly.
Warning:
Open the socket only if actually installing a CPU. The
warranty on the original CPU will be voided if the S/N
seal is broken.
Do not change any factory CPU speed jumper settings.
You do not need to change any jumpers to properly
install the 3.3V Pentium Upgrade Processor.
Before proceeding with the upgrade, take note of the
following. The microprocessor and heat sink may be hot
if the system has been running. To avoid the possibility
of a burn, power the system off and let the processor
and heat sink cool for 10 minutes.
The 321-pin ZIF socket consists of the four rows of pin
holes on each side. To prevent improper OverDrive
Processor installation, the ZIF socket has a Plug/Keying
mechanism. Several holes in the socket are plugged so
OverDrive Processors will go in only one way. If you
cannot easily insert the OverDrive Processor, verify that
pin 1 of the CPU is aligned with pin 1 of the socket. A
warning note — be extremely careful to match pin 1 of
the CPU with pin 1 of the socket. Only Intel's
OverDrive Processor is keyed to prevent improper
placement in the ZIF socket. Other Intel CPUs, as well
42

PCI/ISA System Board

as CPUs from other vendors, can be placed incorrectly
and will be permanently damaged.

Zero Insertion Force (ZIF) Socket
To install an upgrade CPU, do the following.
1. Make sure the handle on the side of the ZIF socket
is up. To raise the handle, push down, pull it out to
the side a little and raise it as far as it will go. The
top plate will slide back. Do not use screwdrivers or
other tools to open the socket, or damage may occur
to the system or socket. It may be necessary to
initially apply a small amount of sideways force to
free the handle from its retaining “tab.” Once clear
of the “tab,” the handle will open relatively easily.

G586OPC

Lifting the Handle
2. Once the lever is completely up, remove the old
CPU by carefully lifting it straight out of the socket.
You are now ready to insert the new CPU.

Pin 1 of the ZIF Socket
44

PCI/ISA System Board

3. Position the CPU above the ZIF socket. Make sure
pin 1 of the CPU is aligned with pin 1 of the socket.
Lower the chip until the pins are inserted properly in
their corresponding holes. Remember that very little
force is needed to install the CPU. If the CPU will
not insert easily, verify pin 1 of the CPU is aligned
with pin 1 of the socket. Applying too much
pressure can damage the CPU or the socket.

Positioning the CPU Above the ZIF Socket
4. Push the handle down until the handle locks into
place. The top plate will slide forward. You will feel
some resistance as the pressure starts to secure the
CPU in the socket. This is normal and will not
damage the CPU. However, if the handle is not
completely closed, damage to the CPU and/or
system board may result.

G586OPC

Clearance Requirements
The 3.3V Pentium Upgrade Processor comes with a heat
sink mounted on top. To maintain proper airflow once
the upgrade is installed on the system board, the
processor and sink require certain space clearances.
The clearance above 3.3V Pentium Upgrade Processor's
fan/heat-sink must be at least 0.4 in. The clearance on at
least 3 of 4 sides of the processor must be at least 0.2
in. The cables (for floppy drive, hard drive, CD-ROM,
etc.) must be routed clear of the CPU and its airspace.
Fan Exhaust
The CPU must be kept cool by using a fan exhaust
configuration in connection with the heatsink. The
temperature of the air entering the fan/heatsink cannot
exceed 45°C. The ambient or room temperature must be
below 37°C (99°F) for a system installed with the 3.3V
Pentium Upgrade Processor.
In order to provide proper airflow to the CPU, all
movable obstructions (power supply cables, cards,
floppy disk cables) must be clear of the CPU heatsink/
fan component in accordance with the space clearance
discussed in the CPU installation section of this manual.

PCI/ISA System Board

Built-in Ports
The G586OPC system board is equipped with two serial
ports, one SPP/EPP/ECP parallel printer port, one FDD
connector, one PS/2 mouse port and two IDE hard disk
shrouded headers.

Locations of the Built-in Ports on the System Board

G586OPC

Serial Ports
The built-in serial ports are RS-232C asynchronous
communication ports with 16C550A-compatible UARTs
that can be used with modems, serial printers, remote
display terminals, and other serial devices. They use the
following system I/O addresses:
Port Configuration

I/O Address

COM1
COM2
COM3/COM4

3F8h
2F8h
3E8h/2E8h

Connecting the Serial Ports
Two DB-9P serial port cables are provided with the
motherboard. They are mounted on a card-edge bracket
along with the PS/2 mouse cable. The upper serial port
cable should be used for the COM 1 primary serial port;
connect it to Connector COM 1 on the motherboard.
The lower serial port cable should be used for the COM
2 secondary serial port; connect it to Connector COM 2
on the motherboard. Make sure the colored stripes on
the ribbon cables align with pin 1 of Connectors COM 1
and COM 2. Mount the card-edge bracket to the system
chassis.

PCI/ISA System Board

The Primary and Secondary Serial Ports
on the G586OPC System Board

PS/2 Mouse Port
The PS/2 mouse port is a 6-pin connector on the
system board. Attach the 6-pin mouse port cable, which
came in the G586OPC box, to Connector J1. Make sure
the brown wire on the PS/2 mouse connector aligns with
pin 1 of connector J1.

G586OPC

The PS/2 Mouse Port on the G586OPC System Board

Parallel Port
The G586OPC system board has a standard connector
for interfacing your PC to a parallel printer. This port is
compatible with both IBM AT printer ports and the
new, high speed, bidirectional Extended Capabilities
Port standard. The parallel port on your system board
can be set to any of the following system I/O addresses:
I/O Address:

3BC-3BE Hex
378-37A Hex *
278-27A Hex

* Default setting

PCI/ISA System Board

Connecting the Parallel Printer Port
Attach the DB-25S printer port cable, which came with
the motherboard, to Connector J7 on the G586OPC
system board. Make sure the colored stripe on the
ribbon cable aligns with pin 1 of Connector J7. Use a
small nutdriver to mount the cable into a DB-25 cutout
in the system chassis.

The Parallel Printer Port on the G586OPC
System Board

Floppy Disk Drive Controller
The G586OPC system board has a built-in floppy disk
controller that supports two standard floppy disk drives.
You can install any 720KB/1.2MB/1.44MB/2.88MB
floppy disk drives.

G586OPC

Connecting the Floppy Disk Cable

The Floppy Disk Connector on the
G586OPC System Board
Step 1
Install the 34-pin header connector into the floppy disk
connector (J8) on the system board. The colored edge of
the ribbon should be aligned to pin 1 of the J8 connector.
Step 2
Install the other 34-pin header connector(s) into the disk
drive(s) with the colored edge of the daisy chained
ribbon cable aligned to pin 1 of the drive edge
connector(s). The end-most connector should be attached to the drive you want to be Drive A.

PCI/ISA System Board

IDE Hard Disk Interface
The G586OPC system board is equipped with two PCI
IDE shrouded headers that will interface four IDE
(Integrated Drive Electronics) hard disk drives.
Note:
Only IDE drives can be connected to the IDE interface.
Connecting the IDE Hard Disk Interface
To prevent improper IDE cable installation, each PCI
IDE shrouded header has a keying mechanism. The 40pin connector on the IDE cable can be placed into the
header only if pin 1 of the connector is aligned with pin
1 of the header.

Note:
The IDE cable with a standard 40-pin connector can be
installed in the PCI IDE shrouded header. Be extremely
careful to match the colored edge of the ribbon with pin
1 of the header.
53

G586OPC

The IDE Hard Disk Connector on the System Board
Step 1
If you are connecting two hard drives, install the 40-pin
connector of the IDE cable into the primary IDE
shrouded header (1st IDE Connector). If you are adding
a third or fourth IDE device, install the 40-pin connector
of the other IDE cable into the secondary IDE shrouded
header (2nd IDE Connector).
Step 2
Install the other 40-pin header connector(s) into the
device with the colored edge of the ribbon cable aligned
to pin 1 of the drive edge connector(s).
Note:
Refer to your disk drive user's manual for information
about selecting proper drive switch settings.
54

PCI/ISA System Board

Adding a Second IDE Hard Drive
When using two IDE drives, one must be set as the
master and the other as the slave. Follow the instructions provided by the drive manufacturer for setting the
jumpers and/or switches on the drives. No changes are
needed on the G586OPC system board when adding a
second hard drive.
We recommend that the IDE hard drives be from the
same manufacturer. In a few cases, drives from two
manufacturers will not function properly when used
together. The problem lies in the hard drives, not the
G586OPC system board.
Preparing an IDE Drive for Use
IDE disk drives are already low-level formatted, with
any bad-track errors entered, when shipped by the drive
manufacturer. Do not attempt to do a low-level format,
or you may cause serious damage to the drive.
To use an IDE drive, you need to enter the drive type
(this information is provided by the drive manufacturer)
into the system’s CMOS setup table. Then run FDISK
and FORMAT provided with DOS.
Note:
Do not run FDISK and FORMAT programs on a drive
that has already been formatted, or you will lose all
programs and data stored on the drive.

G586OPC

Installing Expansion Cards
The G586OPC is equipped with three dedicated PCI and
three dedicated ISA slots. One PCI slot and one ISA slot
are shared. You can only install a card in one or the
other of the shared slots at a time; you cannot install
devices in both slots. Due to the size of the the optional
synchronous pipeline burst cache module installed in the
160-pin cache module upgrade slot, the length of the
card in PCI Slot 2 is limited. Refer to page 27 for limitations. The locations of the expansion slots are shown on
the next page.
Note:
The BIOS needs to be configured for the PCI add-on
cards installed in the PCI slots. Refer to the “PCI
Configuration Setup” chapter presented in the “Initial
Setup Program” section of the manual.

PCI/ISA System Board

Master/Slave

Expansion Slots on the G586OPC
System Board

G586OPC

Installing the System Board
Before installing the system board into your system unit,
you should prepare the tools you will need:
You will need:
• one medium size, flat-bladed screwdriver
• one medium Phillips screwdriver

Step 1
Unlock your system unit. Turn off the power and disconnect all power cords and cables.

Step 2
Remove the system unit cover. Refer to the
manufacturer’s instructions if necessary.

Step 3
Remove expansion cards seated in any of the expansion
slots and detach all connectors from the old system
board.

Step 4
Loosen the screws holding the original system board and
remove the board from the system. Save the screws.

PCI/ISA System Board

Step 5
Remove the G586OPC from its original packing box.
Be careful to avoid touching all connectors and pins on
the board. Please refer to the handling instructions on
pages 6-8 for proper handling techniques.

Step 6
Insert the SIMMs into the SIMM banks on the
G586OPC. The quantity and location of the SIMMs is
dependent upon the memory configuration and type of
modules you intend to use.

Step 7
Install the CPU. Be sure pin 1 of the CPU is aligned
with pin 1 of the socket.

Step 8
Set the corresponding jumpers.

Step 9
Install the prepared G586OPC system board into the
case and replace the screws.

Step 10
Reinstall all cards and connectors and replace the system unit cover. Reconnect all power cords and cables.

G586OPC

v IDE Device Drivers
To install the drivers supported by the system board,
please refer to the “Read Me” file contained on the
installation diskette.

PCI/ISA System Board

v TroubleshootingChecklist
If you experience difficulty with the G586OPC system
board, please refer to the checklist below. If you still
cannot isolate the problem, please contact your dealer.
1) Check the jumper settings to ensure that the jumpers
are properly set. If in doubt, refer to the “Board
Configuration” section.
2) Verify that all SIM modules are seated securely into
the bank sockets.
3) Make sure the SIM modules are in the correct locations.
4) Check that all populated memory banks are filled
with valid size SIM modules.
5) If your board fails to function, place the board on a
flat surface and seat all socketed components (gently
press each component into the socket).
6) If you made changes to the BIOS settings, re-enter
setup and load the BIOS defaults.

G586OPC

v Appendix A: PCI I/O Pin Assignments
B
-12V
TCK
Ground
TDO
+5V
+5V
INTB#
INTD#
PRSNT1#
Reserved
PRSNT2#
Ground
Ground
Reserved
Ground
CLK
Ground
REQ#
+5V (I/O)
AD[31]
AD[29]
Ground
AD[27]
AD[25]
+3.3V
C/BE[3]#
AD[23]
Ground
AD[21]
AD[19]
+3.3V
AD[17]
C/BE[2]#
Ground
IRDY#
+3.3V
DEVSEL#
Ground
LOCK#
PERR#
+3.3V
SERR#
+3.3V
C/BE[1]#
AD[14]
Ground
AD[12]
AD[10]
Ground

- 01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 -

A
Solder Side
TRST#
+12V
TMS
TDI
+5V
INTA#
INTC#
+5V
Reserved
+5V (I/O)
Reserved
Ground
Ground
Reserved
RST#
+5V (I/O)
GNT#
Ground
Reserved
AD[30]
+3.3V
AD[28]
AD[26]
Ground
AD[24]
IDSEL
+3.3V
AD[22]
AD[20]
Ground
AD[18]
AD[16]
+3.3V
FRAME#
Ground
TRDY#
Ground
STOP#
+3.3V
SDONE
SBO#
Ground
PAR
AD[15]
+3.3V
AD[13]
AD[11]
Ground
AD[09]

AD[08]
AD[07]
+3.3V
AD[05]
AD[03]
Ground
AD[01]
+5V (I/O)
ACK64#
+5V
+5V

- 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 -

C/BE[0]#
+3.3V
AD[06]
AD[04]
Ground
AD[02]
AD[00]
+5V (I/O)
REQ64#
+5V
+5V

Component Side

PCI/ISA System Board

v Appendix B: ISA I/O Pin Assignments
B
Gnd
ResetDrv
+5VDC
IRQ9
-5VDC
DRQ2
-12VDC
OWS
+12VDC
Gnd
-SEMEMW
-SEMEMR
-IOW
-IOR
-Dack3
-DRQ3
-Dack1
DRQ1
-Refresh
CLK
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
-Dack2
T/C
Bale
+5VDC
OSC
Gnd

A
- 01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 -

-I/OChck
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
-I/OChrdy
AEN
SA19
SA18
SA17
SA16
SA15
SA14
SA13
SA12
SA11
SA10
SA9
SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0

- 01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 -

SBHE
LA23
LA22
LA21
LA20
LA19
LA18
LA17
-Memr
-Memw
SD08
SD09
SD10
SD11
SD12
SD13
SD14
SD15

D
-MemCS16
-I/OCS16
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
-Dack0
DRQ0
-Dack5
DRQ5
-Dack6
DRQ6
-Dack7
DRQ7
+5VDC
-Master
Gnd

G586OPC

v Appendix C: Connector Pin Assignments
HJ1
J2

PCI/ISA System Board

Connector J1
PS/2 Mouse Connector
Pin

Function

1
2
3
4
5
6

Mouse Data
Reserved
Ground
+5V
Mouse Clock
Reserved

Connector J7
Parallel Printer Port
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
65

Function
-Strobe
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
-Ack
Busy
Paper Empty
Select
-Autofd
-Error
-Init
-Slctin

G586OPC

Pin
18
19
20
21
22
23
24
25

Function
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground

Connector J8
Floppy Disk Drive Connector
Pin

Function

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

Ground
DENSEL
Ground
Reserved
Ground
Drate0
Ground
Index
Ground
MTR0
Ground
DR1
Ground
DR0
Ground
MTR1
Drate1

PCI/ISA System Board

Pin
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

Function
Dir
Ground
Step
Ground
Write Data
Ground
Write Gate
Ground
Track 0
MSEN
Wr Protect
Ground
Read Data
Ground
Head Select
Ground
Disk Change

1st IDE
Primary IDE Hard Disk Drive Connector
Pin
1
2
3
4
5
6
7
8
9
67

Function
-Reset
Ground
D7
D8
D6
D9
D5
D10
D4

G586OPC

Function

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

D11
D3
D12
D2
D13
D1
D14
D0
D15
Ground
Reserved
DRQ0
Ground
-IOW
Ground
-IOR
Ground
IOCHRDY
BALE
DACK0
Ground
IRQ14
IOCS16
SA1
Reserved
SA0
SA2
HCS0
HCS1
LED
Ground

PCI/ISA System Board

2nd IDE
Secondary IDE Hard Disk Drive Connector

Function

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

-Reset
Ground
D7
D8
D6
D9
D5
D10
D4
D11
D3
D12
D2
D13
D1
D14
D0
D15
Ground
Reserved
DRQ1
Ground
-IOW
Ground
-IOR
Ground
Reserved
BALE
DACK1
Ground

G586OPC

Function

31
32
33
34
35
36
37
38
39
40

IRQ15
IOCS16
SA1
Reserved
SA0
SA2
HCS0
HCS1
LED
Ground

COM1 and COM2
Primary (COM1) and Secondary (COM2) Serial Ports
Pin
1
2
3
4
5
6
7
8
9

Function
DCD (Data Carrier Detect)
RX (Receive Data)
TX (Transmit Data)
DTR (Data Terminal Ready)
Ground (Signal Ground)
DSR (Data Set Ready)
RTS (Request to Send)
CTS (Clear to Send)
RI (Ring Indicator)

PCI/ISA System Board

Connector J15
HD LED Connector
Pin

Function

1
2

IDE LED
VCC

Connector J17
Speaker Connector
Pin

Function

1
2
3
4

Data
NC
Ground
VCC

Connector J18
Keylock Connector

Function

1
2
3
4
5

LED Signal
Reserved
Ground
Keylock Signal
Ground

G586OPC

Connector JP25
Green LED/Turbo LED Connector
Pin

Function

1
2

LED (-)
LED (+)

Note:
Connector JP25 functions as Green LED Connector if
the Power Management option is enabled (“Power
Management Setup”).
Connector JP26
Turbo Switch Connector
Pin

Function

1
2

Turbo
GND

Connector S1
Hardware Reset Connector
Pin

Function

1
2

GND
Reset

PCI/ISA System Board

Connector HJ1
PS/2 Keyboard Connector
Pin

Function

1
2
3
4
5
6

Keyboard Data
NC
Ground
VCC
Keyboard CLK
NC

Connector J2
AT Keyboard Connector
Pin

Function

1
2
3
4
5

Keyboard CLK
Keyboard Data
NC
Ground
VCC

Note:
Your G586OPC system board is equipped only with one
of these connectors: Connector HJ1 or Connector J2.

G586OPC

G586OPC
Rev. 0 +
System Board
User’s Manual

- 28450828 -

G586OPC
Rev. 0 +
System Board
User’s Manual

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File Type Extension             : pdf
MIME Type                       : application/pdf
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User Access                     : Print, Copy, Annotate, Fill forms, Extract, Assemble, Print high-res
Creator                         : Adobe PageMaker 6.5
Create Date                     : 1997:12:18 11:19:36
Title                           : G586OPC Rev. 0+
Author                          : DFI
Producer                        : Acrobat PDFWriter 3.02 for Windows NT
Keywords                        : D28450828
Subject                         : Manual
Modify Date                     : 1997:12:18 11:33:04
Page Count                      : 82

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