G486VPB
Rev. 0+
System Board
User’s Manual
- D28750815 -
v Copyright 1995 by DFI, 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 G486VPB 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.
PCI/ISA System Board
v Table of Contents v
Introduction ........................................................................................ 6
Features and Specifications ...................................................... 7
Package Checklist ..................................................................... 9
Installation Overview ........................................................................10
Preparing the Area .............................................................................10
Handling the System Board .....................................................10
Tips in Handling the System Board ...............................11
Hardware Installation ............................................................... 12
Installation Procedures ..................................................12
Locations of Jumpers ..........................................13
Cache Configuration ............................................14
Jumper Setting for Cache Memory ...........16
CPU Installation ...................................................17
Jumpers for CPU Voltage Select ..............19
Jumpers for CPU External Clock Select ...20
Jumpers for CPU Type Select ..................21
Installing Upgrade CPU .............................32
Memory Installation ............................................. 37
Installing the Modules ................................39
Other jumper settings (Internal Battery Select,
CMOS clean Select, EPROM Type,
PS/2 Mouse, CPU External Clock Speed
for PCI Slots, ECP DMA Channel Select) .40
Installing the System Board ................................ 45
Built-in Ports ........................................................47
Serial Ports ............................................... 48
Parallel Ports .............................................49
Floppy Disk Drive Controller .....................51
IDE Hard Disk Interface ............................52
PS/2 Mouse Port .......................................55
Installing Expansion Cards ..................................56
4
G486VPB
Initial Setup Program .......................................................................57
Award BIOS CMOS Setup Utilities .....................................................58
Standard CMOS Setup .......................................................................58
BIOS Features Setup .....................................................61
Chipset Features Setup .................................................63
Power Management Setup .............................................64
PCI Configuration Setup ................................................65
Load BIOS Defaults .......................................................66
Load Setup Defaults ......................................................66
Password Setting ...........................................................67
Supervisor Password ...........................................67
User Password .....................................................68
IDE HDD Auto Detection ...............................................69
Save & Exit Setup ..........................................................70
Exit Without Saving ........................................................70
IDE Device Drivers ........................................................................... 71
Troubleshooting Checklist ...............................................................72
Appendix A: Types of Modules ...............................................74
Appendix B: System Error Report ..........................................76
Appendix C: Memory & I/O Maps ...........................................81
Appendix D: PCI I/O Pin Assignments ...................................83
Appendix E: ISA I/O Pin Assignments ...................................84
Appendix F: Connector Pin Assignments .............................85
Appendix G: Award BIOS Hard Disk Table .............................95
5
PCI/ISA System Board
v Introduction
The G486VPB 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 G486VPB is an Energy Star compliant system
board that supports the Environmental Protection
Agency's Green PC requirements. It reduces energy
consumption by automatically turning off peripherals
when not in use.
The G486VPB system board supports a 237-pin Zero
Insertion Force (ZIF) CPU socket that allows users to
easily upgrade their CPUs. It also supports an optional
Flash EPROM for easy BIOS upgrades. Flash EPROM
is a memory chip for the storage of BIOS which can be
erased in bulk or modified using a software utility.
The G486VPB is equipped with four PCI slots, four ISA
slots (one shared PCI/ISA slot).
Equipped with one built-in VL-bus IDE connector and
one ISA IDE connector, the G486VPB system board can
control four drives and supports fast Mode 4 hard drives
and hard drives larger than 528MB under DOS. The
system board is also equipped with two serial ports, an
ECP/EPP parallel port, a floppy disk drive controller,
and one optional mini-DIN-6 connector for the PS/2
mouse.
The G486VPB can support 1MB to 128MB of memory
using 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36,
8Mx36 and 16Mx36 72-pin SIM modules.
6
Features and Specifications
Processor
• 5V CPUs
Intel 486SX/DX/DX2 (full series) and Pentium
OverDrive Processor
AMD 486DX/DXL/DXL2 (full series)
Cyrix 486SX/DX/DX2 (full series)
• 3.3V CPUs
Intel 486DX4-75/100
AMD 486DX2-66/80NV8T
486DX4-75/100NV8T
486DX2-66/80 SV8B
486DX4-75/100 SV8B
Cyrix 486DX2V-50/66/80
486DX4-100
5x86-100
Chipset
• VIA - VT82C496G - system and cache controller
VT82C505 - Host to PCI bridge
VT82C406 - peripheral chip
G486VPB
TM
Power Management
• Supports System Management Mode (SMM) and
CPU stopped clock
• Hardware provides flexible event-driven power
management scheme and easy CPU transition state:
Ready, Doze and Suspend
• Microsoft APM 1.1 compliant
• EPA Energy Star compliant design
7
PCI/ISA System Board
BIOS
• Award system BIOS (Flash EPROM optional)
• Supports IDE HDDs larger than 528MB under DOS
(LBA mode only)
• System and EGA/VGA BIOS shadow
Super I/O Interface and Fast IDE
• Two NS16C550 compatible serial ports
• One parallel port with EPP and ECP support
• Supports 360K, 720K, 1.2M, and 1.44MB floppy
drives
• Two fast IDE connectors:
Primary IDE connector provides a VL-bus IDE
Secondary IDE connector provides an ISA IDE
Cache Memory
• 128KB, 256KB, or 512KB
• Supports Level 1 and Level 2 write-back/
write-through cache
interface to support up to two Mode 4
enhanced HDDs
Interface to support an ATAPI compliant
CD-ROM or a tape drive
Memory Onboard
• 1MB to 128MB
• Two 72-pin SIMM sockets
• Supports memory parity check function
• Supports 256KBx36, 512KBx36, 1MBx36,
2MBx36, 4MBx36, 8MBx36 and 16MBx36 SIMMs
Expansion Slots
• Three PCI slots
• One shared PCI/ISA slot
• Three 16-bit ISA slots
8
CPU Socket
• 237-pin ZIF socket (Intel Socket 3)
Board Dimensions
• 22cm (8.58") x 22cm (8.58")
Baby AT form factor
PCB
• 4 layers
Package Checklist
The G486VPB package contains the following items:
• The G486VPB system board
• The G486VPB user’s manual
• One IDE driver diskette
• 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
G486VPB
If any of these items are missing or damaged, please
contact your dealer or sales representative for assistance.
9
PCI/ISA System Board
v Installation Overview
This chapter summarizes the steps in installing the
G486VPB system board into your system unit.
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 soft
surfaces such as beds and carpeted floors which can
hinder air circulation. These areas also attract static
electricity which can damage some circuits on your
system board.
Make sure that 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 line.
Move items that generate magnetic fields away from
your system board, since magnetic fields can damage
your system board. Once you have selected the ideal
location, unpack the G486VPB 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.
10
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 edges.
G486VPB
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
ESD portection 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.
11
Hardware Installation
Installation Procedures
Cache configration
CPU installation
Memory modules installation
Other jumper settings
Installing the system board
Built-in Ports
Expansion cards installation
Initial Setup Program
Locations of Jumpers on the G486VPB
PCI/ISA System Board
Cache Configuration
The G486VPB system board can be configured to three
different cache sizes: 128KB (default size), 256KB, and
512KB. Regardless of the amount of cache memory
installed, one 8Kx8 or 32Kx8 is needed for tag RAM to
store the cacheable addresses. The locations of the
SRAM sockets and Jumpers JP10-JP14 on the system
board are shown below.
Locations of the SRAM Sockets and Jumpers JP10-JP14
on the G486VPB System Board
14
G486VPB
To upgrade from 256KB to 512KB of cache memory,
use four pieces of 128Kx8 SRAM.
Cache Size
512KB
256KB
128KB*
* Default setting
↑
Pin 1
Data SRAM
U4/U5/U9/U10
128Kx8x4
64Kx8x4
32Kx8x4
64KX8 or 128Kx8
8KX8 or 32Kx8
SRAM Socket
Tag SRAM
U21
32Kx8x1
32Kx8x1
8Kx8x1
Cacheable
Range
128MB
64MB
32MB
15
PCI/ISA System Board
Jumper Setting for Cache Memory
Please refer to the figure on page 14 for the locations of
Jumpers JP10, JP11, JP12, JP13 and JP14.
128KB* Cache SRAM (Default)
JP12
JP11
JP10
JP13
JP14
1
2
3
256KB Cache SRAM
JP11
JP10
1
2
3
512KB Cache SRAM
JP11
JP10
1
2
3
1
2
3
JP12
JP13
JP14
1
2
3
JP12
JP13
JP14
1
2
3
16
CPU Installation
Get detail information
Set the Voltage setting jumpers
Set the external clock speed
Set the CPU jumpers
Insert your CPU into ZIF socket
G486VPB
of your CPU
jumpers
The G486VPB is equipped with a 237-pin Zero Insertion Force (ZIF) socket at location U17 (please refer to
the next page) of the system board. This socket is designed for the easy removal of the old CPU and the easy
insertion of the upgrade CPU. If you need to apply
excessive force to insert the CPU, the installation is
being done incorrectly. Make sure the jumpers are set
correctly before applying power, or you may damage the
CPU or system board.
17
PCI/ISA System Board
U17
Locations of ZIF Socket, Jumpers
JP6 - JP7, JP9 , JP15 - JP20, JP21, JP23 - JP30 and JRN1 - JRN3
on the G486VPB System Board
18
Jumpers JP21, JP23 and JP24
CPU Voltage Select
5V CPUs * 3.45V CPUs
2
1
JP21
6
5
JP24
1 2 3
JP23
2
1
JP21
6
5
JP24
G486VPB
1 2 3
JP23
JP21 Off and
JP23, JP24 1-2 On:
5V (Default)
5V CPUs:
Intel 486SX/DX/DX2
SX-S/DX-S/DX2-S
DX4 OverDrive
Pentium OverDrive
AMD Am486DX/DXL/DXL2
Cyrix 486SX/DX/DX2
SGS Thompson ST486DX2
3.45V CPUs:
Intel 486DX4
AMD Am486DX2/DX4 NV8T
Am486DX2/DX4 SV8B
UMC U5SD
Cyrix 486DX2-V50
486DX4-100
5x86-100
3.6V CPUs 4V CPUs
2
1
JP21
6
5
JP24
2
2 3
1
JP23
1
JP21
JP21 3-4 On and
JP23, JP24 2-3 On:
3.6V
JP21 1-2 On and
JP23, JP24 2-3 On:
3.45V
6
5
2 3
1
JP24
JP21 5-6 On and
JP23, JP24 2-3 On:
4.0V
JP23
3.6V CPUs:
Cyrix 486DX2-V66
4V CPUs:
Cyrix 486DX2-V80
19
PCI/ISA System Board
Jumpers JP15, JP17 and JP19
CPU External Clock Selection
25MHz
JP19
JP17
JP15
40MHz
JP19
JP17
JP15
1
2
3
JP15 2-3 On, JP17 1-2 On
and JP19 2-3 On:
25MHz
1
2
3
JP15 1-2 On, JP17 1-2 On
and JP19 2-3 On:
40MHz
33MHz *
JP19
JP17
JP15
1
2
3
JP15 2-3 On, JP17 2-3 On
and JP19 1-2 On:
33MHz (Default)
50MHz
JP19
JP17
JP15
1
2
3
JP15 1-2 On, JP17 2-3 On
and JP19 1-2 On:
50MHz
External 25MHz 33MHz * 40MHz 50MHz
CPU Clock Speed
Internal 25/50MHz 33/66/100MHz 40/80MHz 50MHz
CPU Clock Speed
Pentium OverDrive 63MHz 83MHz
Internal Clock Speed
20
Jumper Settings for CPU Type Select
Intel 486SX
G486VPB
Pin 1
21
PCI/ISA System Board
Intel 486DX/DX2 * (Default)
Pin 1
22
Intel DX4
G486VPB
Pin 1
23
PCI/ISA System Board
Intel DX4 OverDrive / Pentium OverDrive
Pin 1
24
AMD Am486DX2 SV8B
G486VPB
Pin 1
25
PCI/ISA System Board
AMD Am486DX2 NV8T
Pin 1
26
AMD Am486DX4 SV8B / Am486DX4 NV8T
G486VPB
Pin 1
27
PCI/ISA System Board
UMC U5SD
Pin 1
28
UMC U5S / U5SLV
G486VPB
Pin 1
29
PCI/ISA System Board
Cyrix Cx486 DX/DX2/DX4
SGS Thompson ST486DX2
Cyrix
Cx486 DX/DX2/DX4
or
SGS
ST486DX2
Pin 1
Pin 1
30
Cyrix Cx5x86
G486VPB
Pin 1
31
PCI/ISA System Board
Installing Upgrade CPUs
The G486VPB is equipped with a 237-pin Zero
Insertion Force (ZIF) socket at location U17 of the
system board. This socket enables you to remove the
old CPU and insert the upgrade CPU easily. 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. Installation of an OverDrive Processor
will not affect the original system warranty.
The 237-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 as CPUs from
other vendors, can be placed incorrectly and will be
permanently damaged if placed incorrectly.
32
Caution:
You will need to change the CPU-type jumper settings.
(Please see the previous pages of this manual.)
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.
Clearance Requirements
The Pentium OverDrive 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 heat sink require certain space clearances.
The clearance above the OverDrive processor's fan/heatsink 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.
Temperature Rating
The ambient or room temperature must be below 37°C
(99°F) for a system installed with the Pentium
OverDrive processor.
G486VPB
Zero Insertion Force (ZIF) Socket
33
PCI/ISA System Board
To install an upgrade CPU in the G486VPB, follow the
steps below.
1. Make sure the handle on the side of the ZIF socket
is up. To raise the handle, 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 lever will open easily.
34
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.
G486VPB
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 no force is
needed to install the CPU. If the CPU will not easily
insert, please verify you have pin 1 of the CPU
aligned with pin 1 of the socket. Applying too much
pressure can damage the CPU or the socket.
4. Push the handle down until the handle locks into its
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.
Positioning the CPU Above the ZIF Socket
35
PCI/ISA System Board
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.
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.
36
Memory Installation
The G486VPB system board can support 1MB to
128MB of memory using HSIM modules. HSIM is an
acronym for High Density Single In-line Memory.
A SIM module consists of several RAM chips soldered
onto a small circuit board. A SIM module connects to
the system board via a 72-pin card-edge connector.
The SIM sockets are divided into four banks on the
system board. The G486VPB uses 256Kx36, 512Kx36,
1Mx36, 2Mx36, 4Mx36, 8Mx36, or 16Mx36 HSIM
modules installed in four banks. Non-parity (x32)
SIMMs can also be used if parity checking is turned off
in CMOS Setup.
You will need 1 or 2 pieces of SIM modules, depending
on the amount of memory you intend to install. The
following table summarizes the bank locations and
modules needed for the corresponding memory sizes.
G486VPB
• Pin1 of the SIMM socket
Locations of SIM Sockets on the
System Board
37
PCI/ISA System Board
Memory Size Bank 0/1 Bank 2/3
1MB 1M 2MB 1M 1M
4MB 4M 5MB 4M 1M
8MB 4M 4M
16MB 16M 17MB 16M 1M
20MB 16M 4M
32MB 16M 16M
64MB 64M 65MB 64M 1M
68MB 64M 4M
128MB 64M 64M
2MB 2M(D)* -
3MB 2M(D)* 1M
4MB 2M(D)* 2M(D)*
6MB 2M(D)* 4M
10MB 2M(D)* 8M(D)*
18MB 2M(D)* 16M
8MB 8M(D)* -
9MB 8M(D)* 1M
12MB 8M(D)* 4M
16MB 8M(D)* 8M(D)*
24MB 8M(D)* 16M
72MB 8M(D)* 64M
32MB 16M(D)* 16M(D)*
32MB 32M(D)* 33MB 32M(D)* 1M
34MB 32M(D)* 2M(D)*
36MB 32M(D)* 4M
40MB 32M(D)* 8M(D)*
48MB 32M(D)* 16M
64MB 32M(D)* 32M(D)*
96MB 32M(D)* 64M
38
*(D) - Double Density
Note:
If you are installing only one SIMM, you can install it in
any of the sockets. The bank you choose is considered to
be Bank 0/1.
Installing the Modules
An HSIM module simply snaps into a socket on the
system board. Pin 1 of the HSIM module must correspond with Pin 1 of the socket.
G486VPB
1. Position the HSIM module 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.
39
PCI/ISA System Board
Other Jumper Settings
Jumper Settings for Internal/External Battery, CMOS Clean, Flash
EPROM, PS/2 Mouse, CPU Speed for PCI Slots and Parallel Port
ECP DMA Channel Setting
JP3
JP8
JP4
JP2
JP1
JP31
JP5
JP22
Locations of Jumpers JP1, JP2, JP3, JP4, JP5, JP22 and JP31
on the G486VPB System Board
40
G486VPB
Jumper JP3
Internal Battery Select
The G486VPB comes with an internal Lithium battery.
If you wish to install an external 3.6V Lithium battery,
set JP3 pins 1 and 2 to On.
321
1-2 On:
External Battery Enabled
Internal Battery Enabled
321
2-3 On:
(Default)
Note:
If you enable the external battery, you must connect the
external battery to connector J3 or your system will lose
its CMOS settings when powered off.
Jumper JP22
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, set
JP22 pins 2 and 3 to On for approximately two minutes,
then return to the default position.
321321
1-2 On:
Normal
(Default)
2-3 On:
CMOS Clean
41
PCI/ISA System Board
Jumper JP5
EPROM Type
Jumper JP5 shoud be set to match the type of the
EPROM installed on the system board. The EPROM
type setting has been set by the manufacturer; do not
change the setting by yourself without manufacturer
authorization.
1
2
3
1-2 On: 12V Flash
EPROM 28F010
(Default)
2-3 On: 5V Flash
EPROM 29F010 or
EPROM 27C010
1
2
3
Jumpers JP2 and JP31
PS/2 Mouse
The G486VPB package includes a card-edge bracket
with serial and mouse port. By default, the mouse port
is disabled. If you intend to use a PS/2 mouse, the port
must be enabled. The PS/2 mouse port uses IRQ12, but
when the PS/2 mouse port is disabled, IRQ12 is available to other devices. To enable the PS/2 mouse, set
Jumper JP2 pins 1 and 2 to On, and JP31 to Off. Make
sure you connect the PS/2 mouse port to Connector
CN3.
JP2
321
321
JP2
42
JP31
JP2 2-3 On and JP31 On:
PS/2 Mouse Disabled
(Default)
JP31
JP2 1-2 On and JP31 Off:
PS/2 Mouse Enabled
G486VPB
Jumpers JP4 and JP8
CPU External Clock Speed for PCI Slots
These jumpers should be configured according to the
type of CPU installed on the system board. Set Jumpers
JP4 and JP8 pins 2 and 3 to On if the CPU external
clock speed is greater than 33MHz. If the CPU external
clock speed is less than or equal to 33MHz, set Jumpers
JP4 and JP8 pins 1 and 2 to On.
321 321
1-2 On:
CPU External Clock Speed
<= 33MHz (Default)
2-3 On:
CPU External Clock
Speed > 33MHz
Set Jumpers JP4 and JP8 pins 2-3 to On if your
G486VPB system board uses one of the following
CPUs: 486DX-50, 486DX2-80, 486DX-40 or
486SX-40. The CPU external clock speed supported
by each of them is greater than 33MHz.
43
PCI/ISA System Board
Jumper JP1
ECP DMA Channel Select
The on-board printer port can be set to ECP mode in
CMOS Setup. In ECP mode (but not in the other printer
port modes), the printer port requires a DMA channel.
Set Jumper JP1 to assign either DMA Channel 1 or
DMA Channel 3 to the ECP port. Use a DMA channel
that does not conflict with your add-in cards. For example, if you have a sound card that uses DMA3, then
assign DMA1 to the ECP port.
1
3
5
2
4
6
1-3, 2-4 On:
DMA 1 (Default)
1
3
5
2
4
6
1
3
5
Off: No DMA 3-5, 4-6 On:
DMA 3
2
4
6
44
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
• one grounded wriststrap for electrostatic
discharge protection
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.
G486VPB
Step 3
Step 4
Wear the grounded wriststrap, remove all expansion
cards and detach all connectors from the old system
board.
Loosen the screws holding the original system board and
remove the board from the system. Save the screws.
45
PCI/ISA System Board
Step 5
Remove the G486VPB 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 10 and 11 for proper handling techniques.
Step 6
Insert the HSIM modules into the SIMM banks on the
G486VPB. The quantity and location of the SIM
modules 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
Step 9
Step 10
46
Set the appropriate jumpers.
Install the prepared G486VPB system board into the
case and replace the screws.
Reinstall all cards and connectors and replace the system unit cover. Reconnect all power cords and cables.
Built-in Ports
The G486VPB system board is equipped with two serial
ports, one ECP/EPP parallel printer port, one FDD
connector, two IDE hard disk connectors and one PS/2
mouse port.
G486VPB
Locations of the Built-in Ports
on the System Board
47
PCI/ISA System Board
Serial Ports
The built-in serial ports are RS-232C asynchronous
communication ports with 16C550-compatible UARTs
that can be used with modems, serial printers, remote
display terminals, and other serial devices. The
G486VPB system board supports IRQ4 for the primary
serial port and IRQ3 for the secondary serial port. These
serial ports use the following system I/O addresses:
Port Configuration
COM1
COM2
COM3
COM4
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 COM1 primary serial port;
connect it to Connector J1 on the motherboard. The
lower serial port cable should be used for the COM2
secondary serial port; connect it to Connector J2 on the
motherboard. Make sure the colored stripes on the
ribbon cables align with pin 1 of Connectors J1 and J2.
Mount the card-edge bracket to the system chassis.
I/O Address
3F8h
2F8h
3E8h
2E8h
48
Parallel Port
The G486VPB 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, bi-directional Extended Capabilities Port
standard. The parallel port on your system board can be
set to any of the following system I/O addresses:
G486VPB
The Primary and Secondary Serial Ports
on the G486VPB System Board
Port Configuration I/O Address
LPT1 3BC-3BE Hex
LPT2* 378-37A Hex
LPT3 278-27A Hex
* Default setting
49
PCI/ISA System Board
Connecting the Parallel Printer Port
Attach the DB-25S printer port cable, which came with
the motherboard, to Connector J5 on the G486VPB
system board. Make sure the colored stripe on the
ribbon cable aligns with pin 1 of Connector J5. Use a
small nutdriver to mount the cable into a DB-25 cutout
in the system chassis.
50
The Parallel Printer Port on the G486VPB System Board
Floppy Disk Drive Controller
The G486VPB system board has a built-in floppy disk
controller that supports two standard floppy disk drives.
You can install any 360KB/720KB/1.2MB/1.44MB
floppy disk drives (2.88MB optional).
Connecting the Floppy Disk Cable
G486VPB
The Floppy Disk Connector on the
G486VPB System Board
Step 1
Install the 34-pin header connector into the floppy disk
connector (J4) on the system board. The colored edge of
the ribbon should be aligned to pin 1 of the J4 connector.
51
PCI/ISA System Board
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.
IDE Hard Disk Interface
The G486VPB system board is equipped with one VLBus IDE connector and one ISA IDE connector that will
interface four IDE (Integrated Drive Electronics) hard
disk drives. An IDE drive is a hard drive with the controller electronics built into the disk assembly. The
integration of the controller and the drive as a single
unit increases both the reliability and performance by
eliminating redundant circuitry.
Note:
Only IDE drives can be connected to the IDE interface.
52
Connecting the IDE Hard Disk Interface
The IDE Hard Disk Connector on the
G486VPB System Board
G486VPB
Step 1
If you are connecting two hard drives, install the 40-pin
connector of the IDE cable into the primary disk connector (J7). If you are adding a third or fourth IDE
device, install the 40-pin connector of the other IDE
cable into the secondary connector (J6). Make sure the
colored edge of the ribbon is aligned to pin 1.
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).
53
PCI/ISA System Board
Note:
Refer to your disk drive user's manual for information
about selecting proper drive switch settings.
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 G486VPB 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
G486VPB 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.
54
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.
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 G486VPB box, to Connector CN3. Make
sure the brown wire on the PS/2 mouse connector aligns
with pin 1 of connector CN3. The other end of the wires
are attached to the card-edge bracket that also holds the
two serial port cables.
G486VPB
The PS/2 Mouse Port on the G486VPB System Board
55
PCI/ISA System Board
Installing Expansion Cards
The G486VPB is equipped with three dedicated PCI and
three dedicated ISA slots. One PCI slot and one ISA slot
is 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 CPU and heatsink/
fan component, card size is limited. The location of the
expansion slots are shown below.
See note
56
Note:
The system can support three bus-master PCI cards.
Place two bus-master cards in slots PCI3 and PCI4. A
third bus-master card can be placed in either slot PCI1
or PCI2. The remaining slot (PCI1 or PCI2) can support a slave card only.
v Initial Setup Program
After you power up your system, the BIOS message
appears on your screen and the memory count begins.
After the memory test, the following message will
appear on the screen:
Press DEL to enter Setup
If the message disappears before you respond, restart
your system or press the “Reset” button. You may also
restart the system by pressing the <Ctrl> <Alt> <Del>
keys. If you do not press these keys at the correct time
and the system does not boot, the following error message will appear:
Press Del to enter Setup
If you have set a password and selected “System” in the
Security Option of the BIOS Feature Setup menu, you
will be prompted for the password every time the system is rebooted or any time you try to enter Setup. Type
in the correct password and press <Enter>.
G486VPB
If you selected “Setup” in the Security Option, you will
be prompted for the password only when you try to
enter Setup. Refer to the “BIOS Features Setup” section
for more information.
57
PCI/ISA System Board
Award BIOS CMOS Setup Utility
Press <Ctrl> <Alt> <Esc> or <Del> simultaneously to
enter the Setup utility. A screen similar to the one below
will appear.
Use the arrow keys to highlight the option you want and
press <Enter>.
Standard CMOS Setup
Use the arrow keys to highlight “Standard CMOS
Setup” and press <Enter>, a screen similar to the one on
the next page will appear.
58
G486VPB
Date and Time
Sets the time and date for the system. Press <F3> for
the calendar.
Primary Master, Primary Slave, Secondary Master and
Secondary Slave
If you have added an IDE drive, you must select the
appropriate type for the drive. You may use the “IDE
HDD Auto Detection” from the main CMOS setup
menu or you can set it manually. The G486VPB has 46
pre-set types and one user-definable type. Use the <Page
Up> or <Page Down> keys to select the appropriate
type for the drive.
The table in Appendix G gives a complete listing of the
available drive types. Any given drive must be set to
one specific drive-type number. Please refer to your IDE
drive documentation to find the appropriate type number.
59
PCI/ISA System Board
If none of the pre-set types is appropriate for your drive,
choose “User”, which is the user-definable type. To use
this type, highlight either the drive you want to set:
Primary Master, Primary Slave, Secondary Master or
Secondary Slave. Use the arrow keys until type “User”
is showing. Fill in all the parameters as specified by the
drive manufacturer. If a drive is not installed, select
“None” and press <Enter>.
Drive A and Drive B
These options are used to select the type of floppy disk
drives installed in your system. If neither drive is
present, select “None”. Make sure you choose the
correct drive type; otherwise, your system might format
the device improperly.
Video
This is used to select the type of video adapter installed
in your system.
Halt on
The system will halt if an error is detected during power
up.
60
No Errors: The system boot will not stop for any
detected errors.
All Errors: The system will stop whenever the
BIOS detects a non-fatal error.
All, But Keyboard: The system will stop for any
errors except a keyboard error.
All, But Diskette: The system will stop for any
errors except a disk error.
All, But Disk/Key: The system will stop for any
errors except a keyboard or disk
error.
Memory
The lower right hand corner shows the base memory
size, extended memory size, and the other memory size
of your system. You cannot alter these items; your
computer automatically detects and displays them.
The Other Memory size refers to the memory located in
the 640K to 1024K address space. This is the memory
used for different applications. DOS uses this area to
load device drivers to keep as much base memory free
for application programs.
When you are through making changes in the Standard
CMOS Setup, press <Esc> to return to the main menu.
BIOS Features Setup
Use the arrow keys to highlight “BIOS Features Setup”
and press <Enter>, a screen similar to the one on the
next page will appear.
G486VPB
61
PCI/ISA System Board
The Virus Warning option may be set to “enabled” or
“disabled”. When enabled, the BIOS issues a warning
when any program or virus sends a Disk Format command or attempts to write to the boot sector of the hard
disk drive.
If you choose “System” in the Security Option, you will
be prompted for a password every time you cold boot
your system or access setup. If you choose “Setup”, you
will be prompted for a password only when trying to
access setup.
62
If the changes you made are incorrect or you change
your mind, press <F6> or <F7> to return to the default
settings. Press <Esc> after making the changes to return
to the main menu.
Chipset Features Setup
The G486VPB uses the VIA chipset. The Chipset
Features Setup allows you to modify some functions to
optimize system performance. It also allows you to
enable, disable or select the port address of the built-in
serial ports, parallel port, floppy disk controller and hard
disk controller.
If you press <Enter>, a screen similar to the one below
will appear.
G486VPB
Use the arrow keys to move the highlight bar to the
option you wish to change or modify. Use the <Page
Up>, <Page Down>, <+> or <-> keys to make the
corresponding changes.
If the changes you made are incorrect or you change
your mind, press <F6> or <F7> to return to the default
settings. Press <Esc> after making the changes to return
to the main menu.
63
PCI/ISA System Board
Power Management Setup
Use the arrow keys to highlight “Power Management
Setup” and press <Enter>. A screen similar to one
below will appear
Choosing “Enabled” in the Power Management option
will allow you to set Doze Timer, Sleep Timer and
Sleep Mode. This will enable your system to reach one
of the following power saving stages: Ready, Doze or
Suspend. Choose “Disabled” if you do not want your
system to enter the power saving mode.
64
PCI Configuration Setup
Use the arrow keys to highlight “PCI Configuration
Setup” and press <Enter>, a screen similar to the one
below will appear.
The G486VPB system board supports four PCI slots.
Each slot may be assigned INT value if the card installed in the slot requires an interrupt. Each INT may
then be assigned an IRQ value.
G486VPB
65
PCI/ISA System Board
Load BIOS Defaults
If, for some reason, the CMOS becomes corrupted,
the system can be reconfigured with the default values
stored in the ROM chips. The BIOS default values
provide the slowest performance for your system. You
should use these values only if you are having hardware
problems.
Highlight this option on the main menu and press
<Enter>. The message below will appear.
Load BIOS Defaults (Y/N)? N
Type “Y” and press <Enter> to load the BIOS setup
default values. After pressing <Enter>, you will be
returned to the main menu.
Load Setup Defaults
The Setup default values are very stable and should be
selected as standard values for your system.
66
Highlight this option on the main menu and press
<Enter>. The message below will appear.
Load Setup Defaults (Y/N)? N
Type “Y” and press <Enter> to load the Setup default
values. After pressing <Enter>, you will be returned to
the main menu.
To configure your system for optimum performance,
you must reset the options under the Chipset Features
setup. You are advised to do so only under the instruction of a technical engineer, otherwise, failure may
occur.
Password Setting
If you want to set a password, make sure that the Security Option under the BIOS Features Setup is set to
“System” or “Setup”. Refer to the BIOS Features Setup
option for more information.
Use the arrow keys to highlight the password Setting
option and press <Enter>. The message below will
appear.
Supervisor Password
Set a supervisor's password with “System” option
selected if you want to protect your system and setup
from unauthorized entry.
If you set a supervisor's password when “Setup” option
is selected under the BIOS Features Setup, only access
to setup will be denied when incorrect password is
entered. You will not be prompted for a password when
you cold boot the system.
G486VPB
Use the arrow keys to highlight the “Supervisor Password” option and press <Enter>. The message below
will appear.
Enter Password:
Type in the password. You are limited to eight characters. Type in a password that is eight characters long or
shorter. When done, the message below will appear:
Confirm Password:
You are asked to verify the password. Type in exactly
the same password. If you type in a wrong password,
67
PCI/ISA System Board
you will be prompted to enter the correct password
again. Otherwise, enter a new password.
To delete or disable the password function, simply press
<Enter> instead of typing in a new password. Press the
<Esc> key to return to the main menu.
If you forget your password, you should clear any
previously set password by setting Jumper JP2 pins 2
and 3 to On for approximately two minutes. Please refer
to page 41 for more information.
User Password
Set a user's password with “System” option selected if
you want another user to have access only to your
system but not to setup. Using user's password to enter
Setup allows a user to access only “User Password”
option that appears on the main screen. Access to all
other options is denied.
If you want to set a user's password when “Setup”
option is selected under the BIOS Features Setup, a user
will be prompted to enter a password only when trying
to access setup. If the correct password is entered, a user
will be able to access only “User Password” option that
appears on the main screen.
68
To set, confirm, verify, disable or delete a user's password, follow the procedure described in the section
above, “Supervisor Password”. If you forget your password, refer to the procedure described in the same
section.
IDE HDD Auto Detection
This option detects the hard disk parameters for the hard
disk drives installed in your system. Highlight this
option and press <Enter>. A screen similar to the one
below will appear.
G486VPB
The screen displays the parameters detected and allows
you to accept or reject the parameters. Type “Y” and
press <Enter> to accept the parameters or press <Esc>
to abort. If you select “Y”, the parameters of the hard
disk will be displayed in the Standard CMOS Setup.
69
PCI/ISA System Board
Save & Exit Setup
When all the changes have been made, highlight “Save
& Exit Setup” and press <Enter>. The message below
will appear:
Save to CMOS and Exit (Y/N)? N
Type “Y” and press <Enter>. The following message
will appear:
Type “Y” and press <Enter>. The modifications you
have made will be written into the CMOS memory, and
the system will reboot. You will once again see the
initial diagnostics on the screen. If you wish to make
additional changes to the setup, press <Ctrl> <Alt>
<Esc> simultaneously or <Del> after memory testing is
done.
Exit Without Saving
Reboot System (Y/N)? N
70
If you do not want to save the changes you have made,
highlight this option and press <Enter>. The message
below will appear:
Quit Without Saving (Y/N)? N
Type “Y” and press <Enter>. The system will reboot
and you will once again see the initial diagnostics on the
screen. If you wish to make any changes to the setup,
press <Ctrl> <Alt> <Esc> simultaneously or <Del> after
memory testing is done.
v IDE Device Drivers
The G486VPB system board uses the VT82C496G that
support two IDE channels: 1Fx channel (Primary IDE
Channel) and 17x channel (Secondary IDE Channel).
The IDE device drivers should be installed under the
“INSTALL.EXE” Utility.
The G486VPB comes with IDE driver diskette(s). The
diskette includes drivers for Microsoft Windows 3.1 and
3.11, Windows NT 3.1 and 3.5, OS/2 2.x and 3.0,
Novell NetWare 3.11 and 4.0x, SCO UNIX 3.2.4.
Note:
If you are using VT82C496G VLB IDE driver, Block
Transfer Mode Option in the System BIOS must be
turned off.
G486VPB
71
PCI/ISA System Board
v Troubleshooting Checklist
If you experience difficulty with the G486VPB 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 that 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).
72
6) If you made changes to the BIOS settings, re-enter
setup and load the BIOS defaults.
7) Check if the internal battery needs to be replaced.
The internal battery is located beside the keyboard
connector.
G486VPB
You should replace the old battery with the type of
lithium battery already used on your system board,
3V lithium battery CR2032. One of the battery
sockets presented below is supported by your
G486VPB board.
To remove the battery from the socket above, push
the black button downward (1) and the battery to the
right (2).
3V Lithium
Battery
(+)
To remove the battery from the socket, simply push
the battery to the left. It will slide out of the socket.
Caution:
Battery may explode if mistreated. Do not recharge,
disassemble or dispose of in fire.
73
PCI/ISA System Board
v Appendix A: Types of Modules
The G486VPB system board allows you to populate
memory with 256Kx36, 512Kx36, 1Mx36, 2Mx36,
4Mx36, 8Mx36 and 16Mx36 SIM modules. The following modules have been tested with this board. Most
untested brands will work but a few may fail to do so.
For SIM 256Kx36 Modules
Brand Chip Number
OKI M51C256A-70
For SIM 512Kx36 Modules
Brand Chip Number
OKI M514256B-70J
For SIM 1Mx36 Modules
Brand Chip Number
Toshiba TC511000AJL
OKI GT-1M*36B
Fujitsu 81C1000A-70
74
For SIM 2Mx36 Modules
Brand Chip Number
OKI M511000B
For SIM 4Mx36 Modules
Brand Chip Number
OKI M514100A-70S
For SIM 8Mx36 Modules
Brand Chip Number
OKI M514100AL-70K
G486VPB
75
PCI/ISA System Board
v Appendix B: System Error Report
When the BIOS encounters an error that requires the
user to correct something, either a beep code will sound
or a message will be displayed in a box in the middle of
the screen and a message PRESS F1 TO CONTINUE,
CTRL-ALT-ESC or DEL TO ENTER SETUP will be
shown in the information box at the bottom.
POST Beep
There is one beep code in BIOS. This code indicates
that a video error has occurred and the BIOS cannot
initialize the video screen to display any additional
information. This beep code consists of a single long
beep followed by two short beeps.
Error Messages
One or more of the following messages may be displayed if the BIOS detects an error during the POST.
76
CMOS BATTERY HAS FAILED
CMOS battery is no longer functional. It should be
replaced. The replacement battery is a 3V lithium
CR2032. Replacing the battery will clear the CMOS.
Refer to the Jumper JP22 section of this manual, page
41, to reset the CMOS. Location of the battery and
replacement procedure are given on pages 73 and 74 of
the manual.
G486VPB
CMOS CHECKSUM ERROR
Checksum of CMOS is incorrect. This can indicate that
CMOS has become corrupt. This error may have been
caused by a weak battery. Check the battery and replace
if necessary.
DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS
ENTER
No boot device was found. Insert a system disk into
Drive A and press <Enter>. Assuming the system is
booted from the hard drive, make sure the controller is
inserted correctly and all cables are properly attached.
Also, be sure the disk is formatted as a boot device;
then reboot the system.
DISKETTE DRIVES OR TYPES MISMATCH ERROR - RUN
SETUP
Type of diskette drive installed in the system is different
from the CMOS definition. Run setup to reconfigure the
drive type correctly.
DISPLAY SWITCH IS SET INCORRECTLY
Display switch on the motherboard can be set to either
monochrome or color. This indicates the switch is set to
a different setting than indicated in Setup. Determine
which setting is correct, and then either turn off the
system and change the jumper, or enter Setup and
change the VIDEO selection.
DISPLAY TYPE HAS CHANGED SINCE LAST BOOT
Since last powering off the system, the display adapter
has been changed. You must configure the system for
the new display type.
77
PCI/ISA System Board
ERROR ENCOUNTERED INITIALIZING HARD DRIVE
Hard drive cannot be initialized. Be sure the adapter is
installed correctly and all cables are correctly and firmly
attached. Also, be sure the correct hard drive type is
selected in Setup (refer to Appendix G).
ERROR INITIALIZING HARD DISK CONTROLLER
Cannot initialize controller. Make sure the card is
correctly and firmly installed in the bus. Be sure the
correct hard drive type is selected in Setup. Also, check
to see if any jumper needs to be set correctly on the
hard drive.
FLOPPY DISK CNTRLR ERROR OR NO CNTRLR
PRESENT
Cannot find or initialize the floppy drive controller.
Make sure the controller is installed correctly and
firmly. If there are no floppy drives installed, be sure the
Diskette Drive selection in Setup is set to NONE.
KEYBOARD ERROR OR NO KEYBOARD PRESENT
Cannot initialize the keyboard. Make sure the keyboard
is attached correctly and no keys are being pressed
during the boot.
78
If you are purposely configuring the system without a
keyboard, set the error halt condition in Setup to HALT
ON ALL, BUT KEYBOARD. This will cause the BIOS
to ignore the missing keyboard and continue the boot.
MEMORY ADDRESS ERROR AT...
Indicates a memory address error at a specific location.
You can use this location along with the memory map
for your system to find and replace the bad memory
chips.
G486VPB
MEMORY PARITY ERROR AT...
Indicates a memory parity error at a specific location.
You can use this location along with the memory map
for your system to find and replace the bad memory
chips.
MEMORY SIZE HAS CHANGED SINCE LAST BOOT
Memory has been added or removed since the last boot.
Enter Setup and enter the new memory size in the
memory fields.
MEMORY VERIFY ERROR AT...
Indicates an error verifying a value already written to
memory. Use the location along with your system’s
memory map to locate the bad chip.
OFFENDING ADDRESS NOT FOUND
This message is used in conjunction with the I/O
CHANNEL CHECK and RAM PARITY ERROR
messages when the segment that has caused the problem
cannot be isolated.
OFFENDING SEGMENT
This message is used in conjunction with the I/O
CHANNEL CHECK and RAM PARITY ERROR
messages when the segment that has caused the problem
has been isolated.
PRESS A KEY TO REBOOT
This will be displayed at the bottom screen when an
error occurs that requires a reboot. Press any key and the
system will reboot.
79
PCI/ISA System Board
PRESS F1 TO DISABLE NMI, F2 TO REBOOT
When BIOS detects a Non-Maskable Interrupt condition
during boot, this will allow NMI to be disabled and
continue to boot. You can also reboot the system with
the NMI enabled.
RAM PARITY ERROR - CHECKING FOR SEGMENT
Indicates a parity error in Random Access Memory.
SYSTEM HALTED, (CTRL-ALT-DEL) TO REBOOT...
Indicates the present boot attempt has been aborted and
the system must be rebooted. Press and hold down the
CTRL and ALT keys and press DEL simultaneously.
80
v Appendix C: Memory & I/O Maps
Memory Address Map
Address Name Function
0000000 to 640K System System Board Memory
009FFFF Board RAM
00A0000 to 128K Video Reserved for Graphics Display
00BFFFF Display Memory Memory
00C0000 to 160K I/O Reserved for ROM on I/O
00E7FFF Expansion ROM Adapter Card
00E8000 to 96K ROM on System Board BIOS
00FFFFF the System Board
0100000 to Maximum System Board Memory
3FFFFFF Memory 128M
G486VPB
81
PCI/ISA System Board
I/O Address Map
I/O Address Function
000-01F DMA Controller 1, 8237A-5
020-03F Interrupt Controller 1, 8259A, Master
040-05F Timer, 8254-2
060-06F 8742 (Keyboard Controller)
070-07F Real-time Clock, NMI
080-09F DMA Page Memory, 74LS612
0A0-08F Interrupt Controller 2, 8259A
0C0-0DF DMA Controller 2, 8237A-5
0E8 Shadow RAM and Cache Control Bit
0F0 Clear Numeric Processor
0F1 Reset Numeric Processor Extension
0F8-OFF Numeric Processor Extension
1F0-1F8 Fixed Disk
200-207 Game I/O
278-27F Parallel Printer Port 2
2F8-2FF Serial Port 2
300-31F Prototype Card
360-36F Reserved
378-37F Parallel Printer Port 1
380-38F SDLC, Bisynchronous 2
3A0-3AF Bisynchronous 1
3B0-3BF Monochrome Display and Printer Adapter
3C0-3CF Reserved
3D0-3DF Color/Graphics Monitor Adapter
3F0-3F7 Diskette Controller
3F8-3FF Serial Port 1
(Non-maskable Interrupt) Mask
Extension Busy
82
Note:
The I/O address hex 000 to 0FF are reserved for the
system board I/0. Hex 100 to 3FF are available on the
I/O channels.
G486VPB
v Appendix D: PCI I/O Pin Assignments
Component Side Solder Side
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
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
83
PCI/ISA System Board
v Appendix E: ISA I/O Pin Assignments
B
Gnd
Reset Drv
+5V DC
IRQ9
-5V DC
DRQ2
-12V DC
OWS
+12V DC
Gnd
-SEMEMW
-SEMEMR
-IOW
-IOR
-Dack3
-DRQ3
-Dack1
DRQ1
-Refresh
CLK
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
-Dack2
T/C
Bale
+5V DC
OSC
Gnd
-Mem CS16
-I/O CS16
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
-Dack0
DRQ0
-Dack5
DRQ5
-Dack6
DRQ6
-Dack7
DRQ7
+5V DC
-Master
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 -
D
- 01 -
- 02 -
- 03 -
- 04 -
- 05 -
- 06 -
- 07 -
- 08 -
- 09 -
- 10 -
- 11 -
- 12 -
- 13 -
- 14 -
- 15 -
- 16 -
- 17 -
- 18 -
-I/O Chck
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
-I/O Chrdy
AEN
SA19
SA18
SA17
SA16
SA15
SA14
SA13
SA12
SA11
SA10
SA9
SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
C
SBHE
LA23
LA22
LA21
LA20
LA19
LA18
LA17
-Memr
-Memw
SD08
SD09
SD10
SD11
SD12
SD13
SD14
SD15
84
G486VPB
v Appendix F: Connector Pin Assignments
J8
IDE2 LED
J9
IDE1 LED
Locations of Connectors on the System Board
J10
Keylock
J11
Speaker
J12
Reset
J13
Turbo SW.
J14
Turbo LED
J15
Green LED
85
PCI/ISA System Board
Connectors J1 and J2
Primary (COM1) and Secondary (COM2) Serial Ports
Connector J5
Parallel Printer Port
Pin
1
2
3
4
5
6
7
8
9
Pin
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)
Function
1
2
3
4
5
6
7
8
9
-Strobe
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
86
G486VPB
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Connector J4
Floppy Disk Drive Connector
Function
-Ack
Busy
Paper Empty
Select
-Autofd
-Error
-Init
-Slctin
Ground
Ground
Ground
Ground
Ground
Ground
PNF
Ground
Pin
Function
1
2
3
4
5
6
7
8
Ground
DENSEL
Ground
Reserved
Ground
Drate0
Ground
Index
87
PCI/ISA System Board
Pin
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
Function
9
Ground
MTR0
Ground
DR1
Ground
DR0
Ground
MTR1
Drate1
Dir
Ground
Step
Ground
Write Data
Ground
Write Gate
Ground
Track 0
MSEN
Wr Protect
Ground
Read Data
Ground
Head Select
Ground
Disk Change
88
Connectors JP6 and JP7
Primary and Secondary IDE Hard Disk Drive Connectors
G486VPB
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Function
1
2
3
4
5
6
7
8
9
-Reset
Ground
D7
D8
D6
D9
D5
D10
D4
D11
D3
D12
D2
D13
D1
D14
D0
D15
Ground
Reserved
Reserved
Ground
-IOW
Ground
-IOR
89
PCI/ISA System Board
Pin
* Pin 27 is Reserved for Secondary IDE Channel
Connectors J8 and J9
IDE1/IDE2 LED
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Function
Ground
IO Channel Ready *
BALE
Reserved
Ground
IRQ14
IOCS16
SA1
Reserved
SA0
SA2
HCS0
HCS1
LED
Ground
90
Pin
1
2
Function
Signal
LED Power
Connector J10
Keylock Connector
Connector J11
Speaker Connector
G486VPB
Pin Function
1 LED Signal
2 Reserved
3 Ground
4 Keylock Signal
5 Ground
Pin
1
2
3
4
Connector JP12
Reset Switch Connector
Function
Signal
Reserved
Ground
+5V
Pin Function
1 Ground
2 Reset
91
PCI/ISA System Board
Connector J13
Turbo/Green Button Connector
Pin Function
1 GND
2 Signal
Connector J14
Turbo LED Connector
Pin Function
1 Signal
2 LED Power
Connector J15
Green LED Connector
92
Pin Function
1 Signal
2 LED Power
Connector J3
External Battery Connector
G486VPB
Connector CN2
Keyboard Connector
Connector CN3
PS/2 Mouse Connector
Pin
1
2
3
4
Pin
1
2
3
4
5
Function
3.6 Lithium Battery
Key
GND
GND
Function
Keyboard Clock
Keyboard Data
Not Connected
Ground
+5V
Pin
1
2
3
4
5
6
Function
Mouse Data
Reserved
Ground
+5V
Mouse Clock
Reserved
93
PCI/ISA System Board
Connector PL1
Power Connector
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Function
Power Good
+5V
+12V
-12V
Ground
Ground
Ground
Ground
-5V
+5V
+5V
+5V
94
G486VPB
v Appendix G: Award BIOS Hard Disk Table
Type
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
Size
Cylinders Heads Sectors
(MB)
10
20
30
62
46
20
30
30
112
20
35
49
20
42
20
40
56
59
30
42
30
10
40
76
71
111
152
306
615
615
940
940
615
462
733
900
820
855
855
306
733
612
977
977
1024
733
733
306
977
1024
1224
1224
1224
1024
4
4
6
8
6
4
8
5
15
3
5
7
8
7
4
5
7
7
5
7
5
4
5
9
7
11
15
17
17
17
17
17
17
17
17
17
17
17
17
17
17
(Reserved)
17
17
17
17
17
17
17
17
17
17
17
17
17
Write
Precomp
128
300
300
512
512
None
256
None
None
None
None
None
128
None
0
300
None
512
300
300
300
0
None
None
None
None
None
Land
Zone
305
615
615
940
940
615
511
733
901
820
855
855
319
733
663
977
977
1023
732
732
733
336
976
1023
1223
1223
1223
Example
Model
TEAC SD510,
MMI 112, 5412
Seagate ST225,
ST4026
Seagate ST125,
Tandon TM262
Tandon TM 703
Disctron 526,
MMI M125
Microscience HH725,
Syquest 3250, 3425
Seagate ST4038
Seagate ST4051
Seagate ST4096
Maxtor 2085
Maxtor 2140,
Priam S14
Maxtor 2190,
Priam S19
95
PCI/ISA System Board
Type
Size
(MB)
68
29
93
30
83
31
69
32
85
33
102
34
110
35
119
36
17
37
136
38
114
39
40
40
42
41
65
42
40
43
61
44
100
45
203
46
User Defined
Cylinders Heads Sectors
1024
918
925
1024
1024
1024
1024
1024
1024
1024
918
820
1024
1024
809
809
776
684
8
11
11
9
10
12
13
14
2
16
15
6
5
5
6
6
8
16
17
17
17
17
17
17
17
17
17
17
17
17
17
26
17
26
33
38
Write
Precomp
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
Land
Zone
1023
1023
1023
926
1023
1023
1023
1023
1023
1023
1023
820
1023
1023
852
852
775
685
Example
Model
Maxtor 1085,
Micropolis 1325
Maxtor 1105 1120,
4780
Maxtor 1170
CDC 9415
Maxtor 1140, 4380
Seagate ST251
Seagate 4053
Miniscribe 3053/6053
Miniscribe 3053/6053
RLL
Miniscribe 3650
Miniscribe 3675 RLL
Conner CP3104
Conner CP3204
96
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