FIC VA-503A VA-503A User Manual rev A0

VA-503A

MAINBOARD

MANUAL

DOC No.: M98809
Rev. : A0
Date : 3, 1999
Part No. : 25-10913-20

T able of Contents

Table of Contents

Chapter 1 Overview

Package Checklist .......................................................................... 1-1

The VA-503A Mainboard .......................................................... 1-2

Main Features ................................................................................ 1-3

Intelligent Properties ...................................................................... 1-5

ACPI Ready ................................................................................... 1-6

Chapter 2 Installation Procedures

1). Set System Switches/Jumpers ................................................... 2-1

Jumpers ..................................................................................... 2-1

Quick Reference (Jumpers) ........................................................ 2-2

Quick Reference (Connectors) .................................................. 2-3

Clear Password: CPW ................................................................ 2-5

Flash ROM Type Selection: EP1, EP2 ........................................ 2-5

Power Supply Type Selection: PWR ......................................... 2-6

2). Install RAM Modules ............................................................... 2-6

SDRAM Memory ...................................................................... 2-6

Install and Remove DIMMs ...................................................... 2-7

Cache Memory .......................................................................... 2-8

3). Install the CPU .......................................................................... 2-9

CPU/SDRAM/AGP Frequency Selection: S2-4/-5.../-10 ............ 2-10

CPU to Bus Frequency Ratio: S2-1/-2/-3 ................................... 2-10

CPU Voltage Selection: S1-1/-2/.../-5 .......................................... 2-11

4). Install Expansion Cards ............................................................. 2-12

Audio Riser Card (optional) ...................................................... 2-13

5). Connect Cables and Power Supply ........................................... 2-14

AT Keyboard Connector: AT_KB ..................................... 2-14

Serial Port Connectors: COM1, COM2 .............................. 2-14

Universal Serial Bus Connectors: USB1, USB2 ................. 2-15

CPU Fan Connector: CPU_FAN ........................................ 2-16

Printer Connector: LPT ...................................................... 2-16

Floppy Diskette Drive Connector: FDD ............................ 2-17

Remote Power Connetor: RPW_CON ............................... 2-17

IDE HDD Device Connectors: PRIMARY, SECONDARY .. 2-18

ATX Power Connector: POWER ....................................... 2-18

Chassis Fan Connector: CHAS_FAN ............................... 2-18

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V A-503A Motherboard Manual

Standard Power Supply Connector: POWER .................... 2-19

Infrared Connector: IR ....................................................... 2-20

Chassis Intrusion Alarm Connector: CHASSIS ................ 2-20

Front Panel Block Connector ............................................ 2-21

Chapter 3 BIOS Setup

CMOS Setup Utility ....................................................................... 3-1

Standard CMOS Setup ................................................................... 3-2

Hard Disk Configurations .......................................................... 3-2

Software Turbo Speed ............................................................... 3-3

BIOS Features Setup ...................................................................... 3-3

Chipset Features Setup .................................................................. 3-6

Power Management Setup ............................................................. 3-9

PNP/PCI Configuration .................................................................. 3-13

Load BIOS Defaults ....................................................................... 3-15

Load Setup Defaults ...................................................................... 3-16

Integrated Peripherals .................................................................... 3-16

Supervisor/User Password ............................................................ 3-21

IDE HDD Auto Detection .............................................................. 3-22

Save and Exit Setup ....................................................................... 3-22

Exit without Saving ........................................................................ 3-22

ii

Notice

Handling Precautions

Warning:

1. Static electricity may cause damage to the integrated circuits on

the motherboard. Before handling any motherboard outside of its
protective packaging, ensure that there is no static electric charge
in your body.

2. There is a danger of explosion if the battery is incorrectly
replaced. Replace only with the same or an equivalent type
recommended by the manufacturer.

3. Discard used batteries according to the manufacturer’ s
instructions.

Observe the following basic precautions when handling the motherboard

or other computer components:

n Wear a static wrist strap which fits around your wrist and is

connected to a natural earth ground.

n Touch a grounded or anti-static surface or a metal fixture such as a

water pipe.

n Avoid contacting the components on add-on cards, motherboards,

and modules with the golden fingers connectors plugged into the

expansion slot. It is best to handle system components by their

monting brackets.

The above methods prevent static build-up and cause it to be discharged

properly.

Trademark

All trademarks mentioned in this manual are registered properly of

the respective owners.

Handling Precautions

This manual may not, in whole or in part, be photocopied, reproduced,

transcribed, translated, or transmitted in whatever form without the

written consent of the manufacturer, except for copies retained by the

purchaser for personal archival purposes.

Overview

Chapter 1

Overview

The VA-503A is a Baby AT-sized Super 7 solution offering high performance, the

highest speed of super 7 processors and the very best in onboard features. It supports

the Pentium MMX, AMD K6, AMD K6-2, Cryix MII 300-400MHz, IBM, IDT

WinChip processors, and significantly, the new AMD K6-III 400/450 MHz* proces-

sors with 66/75/83/95/100MHz Front Side Bus support.

The VA-503A is based around the VIA MVP3 and Super South chipset, giving

advanced performance with high quality audio/visual capabilities on a socket 7 plat-

form. The VA-503A comes with a standard 1MB (manufacturing option: 2MB/512KB)*

of onboard cache.

The Super South chip is a PC98 compliant PCI Super-I/O integrated peripheral con-

troller with integrated super-I/O, integrated sound blaster/direct sound AC97 audio,

and ultra DMA-33/66. The VA-503A also comes equipped with master mode PCI-

EIDE controller, USB controller (with four USB ports support), keyboard control-

ler, RTC, plug and play, enhanced power management, and temperature, voltage,

and fan-speed monitoring.

The VA-503A has 3 DIMM for up to 768 MB SDRAM, and comes with ECC

memory support. It is equipped with 1 AGP, 4 PCI, 1 ISA and 1 AMR expansion slot.

The VA-503A is fully PC98 and Y2K compliant, and is ACPI ready, ensuring im-

proved energy efficiency. Other features include Wake-On-LAN, IrDA, Intel LDCM

software (manufacturing option)* and CD Pro with enhanced drivers.

* For features offered as a manufacturing option, please refer to the detailed specifica-

tions to establish which option is installed on this mainboard.

Package Checklist

If you discover any item below was damaged or lost, please contact your

vendor.

Ö The VA-503A mainboard Ö Software utilities

Ö This user manual Ö One USB cable
Ö One floppy disk drive cable Ö One printer and COM1 cable
Ö One HDD cable Ö One PS/2 mouse and COM2 cable
Ö One audio riser card (optional)

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V A-503A Mainboard Manual

The V A-503A Mainboard

1 - 2

NOTE: On the upper-left corner the photo above, the AC_LINK Con­nector, GAME Connector , and AMR Slot are manufacturing optional.

Overview

Main Features

■ Easy Installation

||BIOS with support for Plug and Play, auto detection of IDE hard drives,

||LS-120|drives, IDE ZIP drives, Windows 95, Windows 98, Windows NT,

||and OS/2.

■ Leading Edge Chipset and Super South

VIA APOLLO MVP3 chipset with integrated DRAM and Level 2 cache

controllers as well as support for Intels new Dynamic Power Manage-

ment Architecture (DPMA), Concurrent PCI (PCI 2.0 and 2.1), AGP 1.0

compliant, and USB.

■ Flexible Processor Support

Onboard 321-pin ZIF socket and switching voltage regulator support

complete range of leading-edge processors:

Intel Pentium 100/133/166/200/233 MHz;

Intel Pentium MMX 166/200/233 MHz.

||||| AMD-K6-166 / 200 / 233 / 266 / 300 MHz; and K6-3/400 MHz;

|| | K6-2-266 / 300 / 333 / 350 / 366 / 380 / 400 / 450 MHz.

|| | Cyrix M II-300 / 333 / 350 MHz; and

| | | Cyrix 6x86MX- PR166 / 200 / 233 / 266 / 300 / 333 / 350 MHz;

|||||||||||Cyrix 6x86L- PR166+ / PR200+ MHz.

|| ||||| |IBM 6x86MX- PR166 / 200 / 233 / 266 / 300 / 333 / 350 MHz;

||||||||| |IBM 6x86L- PR166+ / PR200+ MHz.

|

■ Various External Bus and CPU/Bus Frequency Ratio Support

The board supports the Bus frequency of 66 / 75 / 83 / 95 / 100 / 112 /

124MHz and the CPU/Bus frequency ratio of 2x / 2.5x / 3x / 3.5x / 4x / 4.5x/

5x / 5.5x by a switching voltage regulator which accepts 1.8V to 3.5V.|||(Please

read Install the CPU in Chapter 2 for more information).

■ Ultra-fast Level II Cache

Supports 512KB / 1MB / 2MB onboard Pipeline Burst Level II write-back

cache.

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V A-503A Mainboard Manual

■ Versatile Main Memory Support

Accepts up to 768MB RAM using three DIMMs of 8, 16, 32, 64, 128,

256MB with support for lightning-fast SDRAM (66/100MHz).

■ AGP, ISA, and PCI Expansion Slots

One 32-bit AGP Bus, one 16-bit ISA Bus, and four 32-bit PCI Bus expan-

sion slots provide the room to install a full range of add-on cards.

■ Enhanced PCI Bus Master IDE Controller with Ultra DMA/33 and

Ultra DMA/66 Support

Integrated Enhanced PCI Bus Master IDE controller features two dual-

channel connectors that accept up to four Enhanced IDE devices, includ-

ing CD-ROM and Tape Backup Drives, as well as Hard Disk Drives sup-

porting the new Ultra DMA/66 protocol. Standard PIO Mode 3, PIO Mode

4, DMA Mode 2, DMA Mode 4 devices are also supported.

■ Super Multi I/O

Integrated VIA VT82C686A Plug and Play multi-I/O chipset features two

high-speed UART 16550 compatible serial ports, one SIR (IrDA) port, one

EPP/ECP/SPP capable parallel port, and one FDD connector.

■ Onboard IrDA Connector

An IrDA connector for wireless infrared connections is available.

■ USB Fly Support

A fly cable comes with the board for allowing convenient, high-speed

Plug and Play connections (up to four USB ports) to the growing number

of USB compliant external peripheral devices on the market.

1 - 4

■ AMR Slot and Audio Riser Card (optional)

The board optionally equips AMR slot and come with an audio riser card

to give you the access to hardware most suitable by supporting next

generation, audio-intensive PC applications such as DVD, 3D multi-player

gaming, and interactive music, while the latest, high-quality audio or a

locally certified modem can easily be added to the board based on your

needs.|

Intelligent Properties

■ Optimized MMX Performance

The mainboard utilizes the advanced features of the VIA APOLLO MVP3

chipset to optimize the unrivaled performance of the Intel Pentium pro-

cessor with MMX technology. To provide you with additional flexibility,

the mainboard also supports other leading-edge processors featuring

MMX technology, including the AMD-K6, Cyrix MII, IBM MII, IDT

WinChip processors.

■ Onboard Accelerated Graphics Port (AGP)

The mainboard is installed one 32-bit AGP bus with a dedicated 66MHz/

133MHz path from the graphics card to the system memory (by 1x/2x

mode) offering much greater bandwidth than the 32-bit PCI bus does

which currently operates at a speed of 33MHz and is fully compliant with

the AGP 1.0 specification. AGP enabled 3D graphics cards can directly

access main memory across this fast path instead of using local memory.

To make use of the improved AGP performance, the mainboard should be

installed with SDRAM type memory and the VGA card and drivers should

also be fully AGP compliant. Using Microsofts Windows 98 and Win-

dows NT 5.0 which implement DirectDraw will allow the system to take

full use of AGPs benefits without the need to install additional drivers.

Overview

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V A-503A Mainboard Manual

■ CPU Thermal Monitoring Alert

The onboard Super South bridge (VIA VT82C686A) contains a thermal

alarm on either or any combination of three internal temperature sensing

circuits to make sure the system is operating at a safe heat level. When

the temperature is overheat, the system warns you the the CPU is over-

heating. The CPU utilization is restored to normal levels when the tem-

perature returns to a safe level. Theis feature requires a power supply

with a soft-off power controller.

■ Lightning-Fast SDRAM Performance

The board supports general 66MHz and the new generation of lightning-

fast 100MHz SDRAM via its onboard 168-pin DIMM sockets. SDRAM

delivers an added boost to overall system performance by increasing the

CPU-to-memory data transfer rate. SDRAM performance on the VA-503A

is further boosted by the boards integrated I2C controller, which opti-

mizes the memory timing settings.

ACPI Ready

This mainboard fully implements the new ACPI (Advanced Configuration and

Power Interface) 1.0 Hardware and BIOS requirement. If you install ACPI aware

operating system, such as Windows 98, you fully utilized the power saving

under ACPI.

It is compatible with all other none ACPI operating systems. If you want to

setup ACPI feature under Windows 98, please follow the description below:

Run Windows 98 setup by using setup/p j on the command line for installing

Windows 98 with the ACPI control feature.

If you type setup without the parameter /p j, Windows 98 will be installed as

APM, PnP mode, no ACPI will be used.

For more detail information, please visit the web site of Microsoft. Its address

is: www.microsoft.com/hwtest/.

The major features of ACPI were listed on the next page-

1 - 6

Overview

■ Soft-Off Support

The mainboards Soft-Off feature allows you to turn off your computer

using the operating system. This feature requires a power supply witha

soft-off power controller.

■ Remote Ring-On

The Remote Ring-On function allows your computer to be turned on

remotely via a modem while it is in sleep mode. This feature is particularly

usefully when you are expecting a fax late night and leave only your

modem on to minimize power consumption. As soon as possible the phone

rings, the modem automatically turn on the system, which answers the

phone and downloads the fax. Then the computer shuts off again, thereby

minimizing its consumption of power. The Remote Ring-On function

requires a power supply with a soft-off power controller.

■ RTC Alarm

The RTC alarm feature allows you to preset the computer to wake-up at a

certain time allowing you to implement a number of useful functions, such

as automatically sending out a fax late at night.

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V A-503A Mainboard Manual

This Page Left Blank for Note

1 - 8

Installation Procedures

Chapter 2

Installation Procedures

The motherboard has several user-adjustable jumpers on the board that allow

you to configure your system to suit your requirements. To set up your com-

puter, you should follow these installation steps: 1). set system jumpers; 2).

install RAM modules; 3). install the CPU; 4). install expansion cards; 5). con-

nect devices; 6). set up BIOS feature. 7). set up supporting software tools.

CAUTION: If you use an electric drill to install this motherboard on
your chassis, please wear a static wrist strap. The recommended
electric drill torque is from 5.0 to 8.0 kb/cm to avoid damaging the
chip’s pins.

1). Set System Switches/Jumpers

Jumpers

Jumpers are used to select the operation modes for your system. To set a

jumper, a black cap containing metal contacts is placed over the jumper pins

according to the required configuration. A jumper is said to be shorted when

the black cap has been placed on one or two of its pins. The types of jumpers

used in this manual are shown below:

NOTE: Users are not encouraged to change the jumper settings
not listed in this manual. Changing the jumper settings improperly
may adversely affect system performance.

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V A-503A Mainboard Manual

Quick Reference (Jumpers)

2 - 2

Quick Reference (Connectors)

Installation Procedures

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V A-503A Mainboard Manual

Onboard Mark FUNCTION PAGE

CPW Clear Password 2-5
SW1-6 Clear ROM Type Select 2-5
EP1/2 Flash ROM Type Select 2-6
DIMM1/2/3 DIMM 1/2/3 Socket 2-7
Socket 7 CPU Socket 7 2-9
S2-1-/2/-3 CPU to Bus Freq. Ratio Select 2-10
S2-4/-5/.../-10 CPU/SDRAM/AGP Freq. Select 2-10
S1-1/-2/.../-5 CPU Voltage Select 2-11
ISA ISA Bus Expansion Slot (16-bit) 2-12
PCI1/2/3/4 PCI Bus Expansion Slot (32-bit) 2-12
AGP AGP Bus Expansion Slot (32-bit) 2-12
AMR Audio Riser Card Slot (optional) 2-13
AT-KB AT Keyboard Connector 2-14
COM1/2 Serial Port 2-14
USB1/2 Universal Serial Bus Connector 2-15
CPU_FAN CPU Fan Connector 2-16
LPT Printer Connector 2-16
FDD Floppy Disk Drive Connector 2-17
RPW_CON Remote Power Connector 2-17
PRIMARY/
SECONDARY IDE HDD Device Connector 2-18
POWER ATX Power Connector 2-18
IR Infrared Connector 2-20
CHASSIS Chassis Intrusion Alarm Connector 2-20
Front Panel Block
Connector Connectors to Front Panel 2-21

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Installation Procedures

Clear Password: CPW

This jumper allows you to set the password configuration to Enabled or Dis-

abled. You may need to enable this jumper if you forget your BIOS-level pass-

word.

Flash ROM Type Selection: EP1, EP2

These two jumpers allow you to configure the type of flash ROM chip. This

jumper setting is correct by manufactory default. If you want to know the flash

ROM type installed on this motherboard, remove the sticker from the chip to

see its type.

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V A-503A Mainboard Manual

Power Supply Type Selection: PWR

This jumper allows you to select the power supply type that you use: an AT or

ATX power supply while both power supply connectors onboard. If only one

type of power supply connector onboard, this jumper will be wired by the

manufacturer.

2). Install RAM Modules

SDRAM Memory

The working space of the computer is the Random Access Memory (RAM).

The system cannot act upon data unless it is loaded into RAM. When more

memory is added, the working memory of the computer is larger, thereby in-

creasing total performance. Occasionally the system must break apart data

files because the entire file does not fit into the RAM area. Consequently,

when the system needs data that is not in RAM, it must access the disk where

the balance of the data is stored.

Compared to the lightning speed access of the system has to RAM, accessing

a mechanical disk drive is a slow process. The boards RAM is comprised of

three industry standard 168-pin Dual In-line Memory Modules (DIMMs). Each

DIMM socket is able to support up to 256MB 3.3V (unbuffered) with data

access time of 12ns, 10ns, 8ns or less EDO DRAM or lightning-fast SDRAM.

ECC memory and parity check are also supported. If the DIMM runs at the

speed of 100MHz, it must meet the PC100 specifications. Use the same memory

size of DIMM on each socket for better performance. The maximum total memory

supported is up to 768MB* (a RAM module of this size was not available for

testing).

2 - 6

Installation Procedures

PC100 DIMMs may have a serial EEPROM containing a number of critical

timing parameters and data regarding the chip and DIMM vendor. This guar-

antees that the onboard core chipset will properly recognize the DIMM by

reading all of the important timing parameters specified in the EEPROM on the

serial presence detect interface. The DIMM supplier must understand these

differences in detail and provide the correct information so that the core chipset

will be programmed properly to control memory. Before making SDRAM up-

grades, you should verify the type and speed of the RAM currently installed

from your dealer. Installing mixtures of RAM types other than those described

in this manual, will have unpredictable results.

Install and Remove DIMMs

This mainboard supports 100MHz SDRAM DIMMs; when the system fre-

quency set to 100MHz, PC100-compliant SDRAM should be used.

Complete the following procedures to install DIMMs:

1. Locate the DIMM slots on the mainboard.

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V A-503A Mainboard Manual

2. Install the DIMM straight down

into the DIMM slot with both hands.

3. The clips of the slot will close

up to hold the DIMM in place when

the IMM touches the slot bottom.

Press the clips with both hands to remove the DIMM.

Cache Memory

The board can support onboard 512KB/1MB/2MB synchronous 3.3V Pipeline

Burst SRAMs. Cache memory access is very fast compared to main memory

access. Since cache memory is from five to more than ten times faster than

main memory, the system performance is better.

2 - 8

Installation Procedures

3). Install the CPU

The CPU module resides in the Zero Insertion Force (ZIF) socket on the

motherboard.

CAUTION:

1. Always turn the system power off before installing or removing
any device.

2. Always observe static electricity precautions. See “Handling Pre­cautions” at the start of this manual.

3. Inserting the chip incorrectly may damage the chip.

To install the CPU, do the following:

1. Lift the lever on the side of the CPU socket.

2. Handle the chip by its edges and try not to touch any of the pins.

3. Place the CPU in the socket. The chip has a notch to correctly locate the

chip. Align the notch with pin one of the socket. Pin one is located in the

blank triangular area. Do not force the chip. The CPU should slide easily

into the socket.

4. Swing the lever to the down position to lock the CPU in place.

5. See the following sections for information on the CPU jumpers settings.

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V A-503A Mainboard Manual

CPU/SDRAM/AGP Frequency Selection: S2-4/-5/.../-10

The table below shows the switch settings for the combinations about differ-

ent CPU speeds with SDRAM and AGP frequencies.

CPU to Bus Frequency Ratio: S2-1/-2/-3

These switch settings are used in combination to decide the ratio of the inter-

nal frequency of the CPU to the bus clock.

2 - 10

Installation Procedures

Set CPU Voltage: S1-1/-2/.../-5

This section lists all possible CPU voltages (core voltage) that this motherboard

supports. Please refer to your CPU top marking about the actual CPU voltage.

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V A-503A Mainboard Manual

4). Install Expansion Cards

This section describes how to connect an expansion card to one of your

systems expansion slots. Expansion cards are printed circuit boards that,

when connected to the mainboard, increase the capabilities of your system.

For example, expansion cards can provide video and sound capabilities.

Your mainboard features one AGP Bus slot, one ISA bus slot, four PCI bus

slot, and one optional AMR expansion slots.

CAUTION:

1. Always turn the system power off before installing or removing
any device.

2. Always observe static electricity precautions. Please read “Han­dling Precautions” at the start of this manual.

To install an expansion card, follow the steps below:

1. Remove the chassis cover and select an empty expansion slot.

2. Remove the corresponding slot cover from the computer chassis.

Unscrew the mounting screw that secures the slot cover and pull

the slot cover out from the computer chassis. Keep the slot cover

mounting screw nearby.

3. Holding the edge of the peripheral card, carefully align the edge

connector with the expansion slot.

2 - 12

Installation Procedures

4. Push the card firmly into the slot. Push down on one end of the

expansion card, then the other. Use this rocking motion until the

addon card is firmly seated inside the expansion slot.

5. Secure the board with the mounting screw removed in Step 2. Make

sure that the card has been placed evenly and completely into the

expansion slot.

Audio Riser Card (optional)

The mainboard offers an optional AMR slot for using the audio riser card to

utilize the onboard audio features. The riser card owns CD_IN1 and CD_IN2

connector for different specifications of the audio cable which the other end

plugged into your CD drive. The riser card does not provide modem functions.

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V A-503A Mainboard Manual

5). Connect Cables and Power Supply

AT Keyboard Connector: AT_KB

The cable of your 101-key enhanced keyboard or 106-key Windows 95 key-

board is plugged into this connector.

Serial Port Connectors: COM1, COM2

These two connectors allow you to connect with your devices that take serial

ports, such as a serial mouse or a modem. Usually, it is recommended to con-

nect your serial mouse to COM1 and your fax/modem to COM2.

2 - 14

Installation Procedures

Universal Serial Bus Connectors: USB1, USB2

These two 2x5 pinheads link with USB peripheral devices via either a dual-port

USB cable that one bracket with a 2x5-hole plug (the photo below right), or a

single-port USB cable that has a 1x 4-hole plug (the photo below left).

The pin 1of the connector must be matched with the hole of the 1x4-hole plug

that with a triangular mark; the pin 2 of the connector must be matched with

the hole of the 2x5-hole plug that with a triangular mark.

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V A-503A Mainboard Manual

CPU Fan Connector: CPU_FAN

This connector is linked to the standard CPU fan for cooling the CPU tempera-

ture.

Printer Connector: LPT

This connector is featured onboard for the connection with your printer.

2 - 16

Installation Procedures

Floppy Diskette Drive Connector: FDD

This 26-pin block connector connects to your slim floppy disk drive using the

FFC-cable that is provided with this mainboard. Insert one end of the silver-

finger contact and press down the FDD connector on both sides to lock it in

place. After connecting the single end to the mainboard, connect the other

end to the floppy drive.

Remote Power Connector: RPW_CON

This 3-pin connector allows you to enable (or disable) the system power if the

RPW_SW is on (or off) when an AT power supply is installed. Some of AT

power supply come with a 3-pin plug, plug it on this connector. If you use an

ATX power supply, ignore this connector. It allows soft power off in Windows

95/98.

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V A-503A Mainboard Manual

IDE HDD Device Connectors: PRIMARY, SECONDARY

These two connectors are used for your IDE hard disk drives, CD drives, LS-

120|drives, or IDE ZIP drives. The support the provided IDE hard disk ribbon

cable is used for your IDE hard disk drive. After connecting the single end to

the mainboard, connect the other plug to the other end of your hard disk . Pin

20 is removed to prevent inserting in the wrong orientation when using ribbon

cables with pin 20 plugged.

ATX Power Connector: POWER

This connector is connected to the ATX power supply.

2 - 18

Installation Procedures

Chassis Fan Connector: CHAS_FAN

This connector is for linking to your cooling fan on the system case to lower

the temperature of the system.

AT Power Supply Connector: POWER

This 12-pin block connector is used for connecting to the standard 5V power

supply. There are two marks P8 and P9 on the surface of the connector.

You have to insert the P8 plug into the P8 section, and so forth for P9.

Please read PWR jumper in Page 11 if an AT power supply is used.

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V A-503A Mainboard Manual

Infrared Connector: IR

This 5-pin connector is used to link with your IR device to allow transmission

of data to another system that also supports the IR feature. This module

mounts to a small opening on system cases that supports this feature.

Chassis Intrusion Alarm Connector: CHASSIS

This 3-pin pinhead provides users with the functions that messages from the

operating systems and system cases which support LDCM if the system cases

intrusion occurred.

This feature is cooperated with the system case either by optical or mechani-

cal way. If you purchase a case that supports the intrusion alarm by mechani-

cal means; please check with your vendor carefully if it can work with this

board.

2 - 20

Installation Procedures

Front Panel Block Connector

This block connector concludes the connectors for linking with IDE LED,

power LED, remote power button, message LED, suspend button, reset but-

ton and speaker on the front panel of the system case. Please identify polari-

ties of plug wires for the case speaker and LEDs. Please ask vendor about this

information when you buy them and install the system by yourself. The plug

wires polarities of this buttons will not affect the function.

Power LED (A) is connected with the system power indicator to indicate

whether the system is on/off. When the system enter the suspend mode, it

blinks.

Remote Power Button (B) is connected with remote power (soft power) switch.

Push this switch will turn off and on the system instead of turning the power

switch on the power supply.

Message LED (C) is connected with the message LED. When the system is

running normally, the indicator is off. It is controlled by the operating system

or application software.

Suspend Button (D) is connected with suspend mode switch.

Reset Button (E) is connected to the reset switch. Push this switch to reboot

the system instead of turning power switch off and on.

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V A-503A Mainboard Manual

Speaker (F) is connected with the case speaker.

IDE LED (G) is connected IDE device indicator. This LED will blink when the

hard disk drives are activated.

2 - 22

BIOS Setup

Chapter 3

BIOS Setup

The mainboard comes with the Award BIOS chip that contains the ROM Setup

information of your system. This chip serves as an interface between the

processor and the rest of the mainboards components. This section explains

the information contained in the Setup program and tells you how to modify

the settings according to your system configuration.

CMOS Setup Utility

A Setup program, built into the system BIOS, is stored in the CMOS RAM.

This Setup utility program allows changes to the mainboard configuration

settings. It is executed when the user changes system configuration; user

changes system backup battery; or the system detects a configuration error

and asks the user to run the Setup program. Use the arrow keys to select and

press Enter to run the selected program.

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VA-503A Mainboard Manual

Standard CMOS Setup

The Standard CMOS Setup screen is displayed above. Each item may have

one or more option settings. The system BIOS automatically detects memory

size, thus no changes are necessary. Use the arrow keys to highlight the item

and then use the PgUp or PgDn keys to select the value you want in each item.

Hard Disk Configurations

TYPE: Select User to fill the remaining fields. Select Auto to detect the

HDD type automatically (recommended).

SIZE: The hard disk size. The unit is Mega Bytes.

CYLS: The cylinder number of the hard disk.

HEAD: The read/write head number of hard disk.

PRECOMP: The cylinder number at which the disk drive changes the

write current.

LANDZ: The cylinder number that the disk drive heads (read/write) are

seated when the disk drive is parked.

SECTOR: The sector number of each track defined on the hard disk.

MODE: Select Auto to detect the mode type automatically. If your hard

disk supports the LBA mode, select LBA or Large. However, if your hard

disk cylinder is more than 1024 and does not support the LBA function, set

at Large. Select Normal if your hard disk supporting cylinders is below

1024.

3 - 2

BIOS Setup

Software Turbo Speed

The BIOS supports Software Turbo Speed feature. Instead of pressing the

Turbo Speed Button on the front panel, simply press the Alt, Ctrl, and +

keys at the same time to enable the Turbo Speed feature; and press the Alt,

Ctrl, and - keys at the same time to disable the feature.

BIOS Features Setup

Anti-Virus Protection

This feature starts the virus scan tool to detect if boot virus in boot sector

of the first hard disk drive when booting up.

The options are: Enabled (Default), Disabled.

CPU Internal Cache

When enabled, improves the system performance. Disable this item when

testing or trouble-shooting. The options are: Enabled (Default), Disabled.

External Cache

When enabled, supports an optional cache SRAM. This feature allows

you to disable the cache function when the system performance is un-

stable to run some software. The options are: Enabled (Default), Disabled.

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VA-503A Mainboard Manual

Quick Power On Self T est

When enabled, allows the BIOS to bypass the extensive memory test.

The options are: Enabled (Default), Disabled.

Boot From LAN First

This feature makes the system bootable by the remote server via LAN.

The options are: Enabled (Default), Disabled.

Boot Sequence

Allows the system BIOS to first try to boot the operating system from the

selected disk drive. The options are: A, C, SCSI (Default); C, A, SCSI; C,

CDROM, A; CDROM, C, A; D, A, SCSI; E, A, SCSI; F, A, SCSI; SCSI, A, C;

SCSI, C, A; C Only; LS/ZIP, C.

Boot Up Floppy Seek

When enabled, assigns the BIOS to perform floppy diskette drive tests by

issuing the time-consuming seek commands. The options are: Enabled

(Default), Disabled.

Boot Up Numlock Status

When set to On, allows the BIOS to automatically enable the Num Lock

Function when the system boots up. The options are: On (Default), Off.

Gate A20 Option

When set at Fast, allows a faster access response under Protected mode.

The options are: Fast (Default), Normal.

Memory Parity Check

This feature enables BIOS to perform automatic memory checking upon

detection of ECC or parity DRAM. The options are: Enabled, Disabled

(Default).

Typematic Rate Setting

The term typematic means that when a keyboard key is held down, the

character is repeatedly entered until the key is released.

The options are: Disabled (Default), Enabled.

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BIOS Setup

Typematic Rate (Chars/Sec)

This feature is available only if the above item, Typematic Rate Setting, is

set at Enabled. Sets the rate of a character repeat when the key is held

down.

The options are: 6 (Default), 8, 10, 12, 15, 20, 24, 30.

Typematic Delay (Msec)

This feature is available only if the item, Typematic Rate Setting, is set at

Enabled. Sets the delay time before a character is repeated.

The options are: 250 (Default), 500, 750, 1000 millisecond.

Security Option

Allows you to set the security level of the system.

The options are: Setup (Default), System.

PCI/VGA Palette Snoop

Set this feature to be enabled if any ISA adapter card installed in the

system requires the VGA palette snoop function.

The options are: Disabled (Default), Enabled.

OS Select For DRAM > 64MB

If your operating system (OS) is OS/2, select the option OS2. Otherwise,

stay with the default setting Non-OS2.

The options are: Non-OS2 (Default), OS2.

HDD S.M.A.R.T . Capability

S.M.A.R.T. stands for Self-Monitoring and Analysis Reporting Technol-

ogy which allows your hard disk drive to report any read/write errors and

issues a warning with LDCM installed.

The options are: Disabled (Default); Enabled.

Report No FDD For WIN 95

When the field under the Standard CMOS Setup Menu for Drive A and/or

Drive B is set at None, users must set this field is set at Yes for it to function

properly. Otherwise, set at No, even if field for Drive A and/or Drive B is set

at None, system will still detect and recognize of a floppy drive(s).

The options are: Yes (Default), No.

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VA-503A Mainboard Manual

Video BIOS Shadow

Allows the BIOS to copy the video ROM code of the add-on video card to

the system memory for faster access.

The options are: Enabled (Default), Disabled.

Chipset Features Setup

Bank 0/1 DRAM Timing; Bank 2/3 DRAM Timing;
Bank 4/5 DRAM Timing;

This feature allows you to select the DRAM read/write speed.

The options are: FP/EDO 70ns (Default), FP/EDO 60ns, Fast, Normal, Turbo.

SDRAM Cycle Length

This item will function only when SDRAM DIMM/s are installed on the

mainboard (BIOS auto detection). If the CAS latency of your SDRAM

DIMM is 2, set it at 2 to enhance your system performance. If the CAS

latency of your SDRAM DIMM is 3, stay with the default setting, 3.

The options are: 3; 2; Auto (Default).

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BIOS Setup

DRAM Read Pipeline

When enabled, it makes the data read speed from memory modules to

cache RAMs faster. The options are: Enabled (Default), Disabled.

Cache Rd+CPU Wt Pipeline

When enabled, it makes the cache RAMs read and the data write to CPU

faster.

The options are: Enabled (Default), Disabled.

Cache Timing

The feature allows users to select the cache timing.

The options are: Fast (Default), Fastest.

Video BIOS Cacheable

When enabled, allows the system to use the video BIOS codes from SRAMs,

instead of the slower DRAMs or ROMs.

The options are: Enabled (Default), Disabled.

System BIOS Cacheable

When enabled, allows the ROM area F000H-FFFFH to be cacheable when

cache controller is activated. The options are: Enabled (Default), Disabled.

Memory Hole At 15M Addr.

When you install a Legacy ISA card, this feature allows you to select the

memory holes address range of the ISA cycle when the processor ac-

cesses the selected address area. Please read your card manual for detail

information. When disabled, the memory hole at the 14MB (or 15MB)

address will be treated as a DRAM cycle when the processor accesses the

14~16MB (or 15~16MB) address area.

The options are: 15M-16M, 14M-16M, Disabled (Default).

AGP Aperture Size

It allows you to select the main memory frame size for AGP use.

The options are 4, 8, 16, 32, 64 (Default), 128MB.

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VA-503A Mainboard Manual

AGP-2X Mode

This feature allows user to select the AGP mode be to 1x or 2x when an

AGP add-in card installed. However, when set at Enabled and the AGP

card only support 1x mode, the system will fall back 1x mode automatically.

The options are: Enable (Default), Disable.

OnChip Sound

When set at Enabled, this feature activated the onboard audio feature.

The options are: Enabled (Default), Disabled.

OnChip Modem

When set at Enabled, this feature activated the onboard modem feature.

The options are: Disabled (Default), Enabled .

OnChip USB

When enabled, this feature allows you to use the onboard USB feature.

The options are: Enabled (Default), Disabled.

OnChip USB 2

When enabled, this feature allows you to use the onboard USB feature.

The options are: Enabled (Default), Disabled.

USB Keyboard Support

This feature will appear only if the above item Onchip USB is set at En-

abled. Set this feature to Enabled to use a USB keyboard with your system.

The options are: Disabled (Default), Enabled.

Auto Detect DIMM/PCI Clk

Set this field at Enabled to allow auto detection of DIMM clock speed.

The options are: Enabled (Default), Disabled.

Spread Spectrum Modulated

This feature is used to set the spread Spectrum to be center spread type or

down spread type. The options are: Enabled (Default), Disabled.

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BIOS Setup

CPU Host Clock

Select Default or select a timing combination for the CPU and the PCI bus.

When set to Default, BIOS uses the actual CPU and PCI bus clock values.

The options are: Default (default); 66MHz; 68MHz;75MHz; 83MHz; 95MHz;

100MHz; 112 MHz; 124MHz.

Current CPU T emp. / Current System T emp. / Current CPUF AN1 Speed
/ Current CPUFAN2 Speed / Vcore / 3.3V /12V / 5V

These items allow end users and technicians to monitor data provided by

the BIOS on this mainboard. It is not user-configurable.

Power Management Setup

Power Management

This item allows you to adjust the power management features. Select

Disable for disabling global power management features. Select User De-

fine for configuring your own power management features. MIN Saving

initiates all predefined timers in their minimum values. MAX Saving, on the

other hand, initiates maximum values.

The options are: User Define (Default), MIN Saving, MAX Saving.

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VA-503A Mainboard Manual

PM Control by APM

The option No allows the BIOS to ignore the APM (Advanced Power

Management) specification. Selecting Yes will allow the BIOS wait for

APMs prompt before it enters Doze mode, Standby mode, or Suspend

mode. If the APM is installed, it will prompt the BIOS to set the system into

power saving mode when all tasks are done.

The options are: No, Yes (Default).

Video Off Option

This feature provides the selections of the video display power saving

mode. The option Suspend - Off allows the video display to go blank if the

system enters Suspend mode. The option All Modes - Off allows the video

display to go blank if the system enters Doze mode or Suspend mode. The

option Always On allows the video display to stay in Standby mode even

when the system enters Doze or Suspend mode.

The options are: Suspend - Off (Default), All Modes - Off, Always On.

Video Off Method

The option V/H SYNC+Blank allows the BIOS to blank off screen display

by turning off the V-Sync and H-Sync signals sent from add-on VGA card.

DPMS Support allows the BIOS to blank off screen display by your add-

on VGA card which supports DPMS (Display Power Management Signal-

ing function). Blank Screen allows the BIOS to blank off screen display by

turning off the red-green-blue signals.

The options are: V/H SYNC+Blank, DPMS Support (Default), Blank Screen.

MODEM Use IRQ

The feature allows users to select the IRQ# of the system that is the same

IRQ# as the modem use.

The settings are: NA, 3 (Default), 4, 5, 7, 9, 10, 11.

Soft-Off by PWR-BTTN

The selection Delay 4 Sec. will allow the system shut down after 4 seconds

after the power button is pressed. The selection Instant-Off will allow the

system shut down immediately once the power button is pressed.

The settings are: Delay 4 Sec. (Default), or Instant-Off.

3 - 10

BIOS Setup

PWRON After PW-Fail

When the system is shut down owing to the power failure, the syhstem wil

not be back to power on by itself. This feature allows you to set the system

back to which power status of the system when the system power is re-

sumed. The options are: Former-Sts (Default), On, Off.

HDD Power Down

The option lets the BIOS turn the HDD motor off when system is in Sus-

pend mode. Selecting 1 Min..15 Min allows you define the HDD idle time

before the HDD enters the Power Saving Mode.

The options 1 Min..15 Min will not work concurrently. When HDD is in the

Power Saving Mode, any access to the HDD will wake the HDD up.

The options are: Disable (Default), 1 Min..15 Min.

Doze Mode

When disabled, the system will not enter Doze mode. The specified time

option defines the idle time the system takes before it enters Doze mode.

The options are: Disabled (Default), 1, 2, 4, 8, 12, 20, 30, 40 Min, 1 Hr.

Suspend Mode

When disabled, the system will not enter Suspend mode. The specified

time option defines the idle time the system takes before it enters Suspend

mode. The options are: Disabled (Default), 1, 2, 4, 8, 12, 20, 30, 40 Min, 1 Hr.

VGA

ON enables the power management timers when a no activity events is

detected in the VGA. OFF disables the PM timer even if a no activity event

is detected. The options are: OFF (Default), ON.

LPT & COM

LPT/COM enables the power management timers when a no activity event

is detected in the LPT and COM ports. LPT (COM) enables the power

management timers when a no activity event is detected in the LPT (COM)

ports. NONE to disable the PM timer even if a no activity event is detected.

The options are: LPT/COM (Default), LPT, COM, NONE.

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VA-503A Mainboard Manual

HDD & FDD

ON will enable the power management timers when no activity event is

detected in the hard drive and floppy drive. OFF disables the PM timer

even if no activity event is detected. The options are: OFF, ON (Default).

DMA/master

To set this feature at ON activates that Power Management feautre (PM)

wake-up event for the DMA or bus master (of the LAN card or/and SCSI

card). The options are: OFF (Default), ON.

Modem Ring Resume

An input signal on the serial Ring Indicator (RI) line (in other words, an

incoming call on the modem) awakens the system from a soft off state.

The options are: Enabled (Default), Disabled.

RTC Alarm Resume

Enabled allows you to set the time the system will be turned on from the

system power-off status. The options are: Enabled, Disabled (Default).

Primary INTR

Whe the Primary interrupt (the Primary option in the featuer of IRQ# Activ-

ity) generates will make the Power Management feautre (PM) wake-up

event on. If set at OFF, all the primary interrupt will not wake-up the systetm.

The options are: OFF, ON (Default).

IRQ# Activity

After the time period which you set at in Suspend Mode Feature, the

system advances from Doze Mode to Suspend Mode in which the CPU

clock stops and the screen display is off. At this moment, if the IRQ activ-

ity which is defined as Primary occurs, the system goes back to Full-on

Mode directly.

If the IRQ activity which is defined as Secondary takes place, the system

enters another low power state, Dream Mode, in which the system will act

as Full-on Mode except that the screen display remains off until the corre-

sponding IRQ handler finishes, then back to Suspend Mode.

The options of IRQ 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15 are: Primary, Second-

ary, Disabled.

The default values of IRQ 5, 8, 15 are: Disabled.

The default value of IRQ 3, 4, 7, 12, 14 are: Primary.

The default value of IRQ 9, 10, 11 are: Secondary.

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BIOS Setup

PNP/PCI Configuration

PNP OS Installed

If your operating system is a Plug-and-Play one, such as Windows NT,

Windows 95, select Yes. The options are: No (Default), Yes.

Resources Controlled By

If set at Auto, the BIOS arranges all system resources. If there exists con-

flict, select Manual. The options are: Auto (Default), Manual. The manual

options of IRQ- / DMA- assigned to are: Legacy ISA, PCI/ISA PnP.

Reset Configuration Data

When enabled, allows the system to clear the last BIOS configuration data

and reset with the default data. The options are: Enabled, Disabled (De-

fault).

CPU to PCI Write Buffer

When enabled, allows data and address access to the internal buffer of

the system controller; so the processor can be released from the waiting

state.

The options are: Enabled (Default), Disabled.

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VA-503A Mainboard Manual

PCI Dynamic Bursting

When enabled, the PCI controller allows Bursting PCI transfer if the con-

secutive PCI cycles come with the address falling in same 1KB space. This

improves the PCI bus throughput.

The options are: Enabled (Default), Disabled.

PCI Master 0 WS Write

When enabled, allows a zero-wait-state-cycle delay when the PCI master

drive writes data to DRAM. The options are: Enabled (Default), Disabled.

PCI Delay Transaction

Enable this feature to abort the current CPI master cycle and to accept the

new PCI master request, it reaccepts the original PCI master and returns

the PCI data phase to the original PCI master.

The options are: Disabled, Enabled (Default).

PCI#2 Access #1 Retry

When enabled, the AGP (PCI#2) access to PCI (PCI#1) will be retried until

the maximum count. The options are: Disabled (default); Enabled.

AGP Master 1 WS Write

When enabled, the AGP bus master write access to DRAMs will add one

wait-state cycle. The options are: Enabled (default); Disabled.

AGP Master 1 WS Read

When enabled, the AGP bus master read access to the DRAMs will add

one wait-state cycle. The options are: Disabled (default); Enabled.

PCI IRQ Actived By

Leave the IRQ trigger set at Level unless the PCI device assigned to the

interrupt specifies Edge-triggered interrupts.

The options are: Level (default); Edge.

Assign IRQ For VGA

If your PCI VGA card does not need an IRQ, select Disabled; therefore, an

IRQ can be released for the system use.

The options are: Enabled (Default), Disabled.

3 - 14

BIOS Setup

Slot 1/2/3/4 Use IRQ No.

Some PCI devices would need to use an IRQ on the PCI bus. Selecting

Auto allows the PCI controller to automatically allocate an IRQ.

The options are: Auto (default); 3 to 5; 7; 9 to 12; 14; 15.

Load BIOS Defaults

BIOS defaults contain the most appropriate values of the system parameters

that allow minimum system performance. The OEM manufacturer may change

the defaults through MODBIN before the binary image burns into the ROM.

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VA-503A Mainboard Manual

Load Setup Defaults

Selecting this field loads the factory defaults for BIOS and Chipset Features

which the system automatically detects.

Integrated Peripherals

3 - 16

BIOS Setup

OnChip IDE First Channel

When enabled, allows you to use the onboard primary PCI IDE. If a hard

disk controller card is used, set at Disabled.

The options are: Enabled (Default), Disabled.

OnChip IDE Second Channel

When enabled, allows you to use the onboard secondary PCI IDE. If a

hard disk controller card is used, set at Disabled.

The options are: Enabled (Default), Disabled.

IDE Prefetch Mode

When set at Enabled, it allows data to be posted to and prefetched from

the primary IDE data ports. Data prefetching is initiated when a data port

read occurs. The read prefetch eliments latency to the IDE data ports and

allows them to be performed back to back for the highest possible PIO data

transfer rates. The first data prot read of a sector is called the demand read.

Subsequent data port reads from the sector are called prefetch reads. The

demand read and all prefetch reads must be of the same size (16 or 32 bits).

The options are: Enabled (Default), Disabled.

IDE HDD Block Mode

When enabled, the system executes read/write requests to hard disk in

block mode. The options are: Enabled (Default), Disabled.

IDE Primary Master PIO

Allows an automatic or a manual configuration of the PCI primary IDE hard

disk (master) mode. The options are: Auto (Default), Mode 0, Mode 1,

Mode 2, Mode 3, Mode 4.

IDE Primary Slave PIO

Allows an automatic or a manual configuration of the PCI primary IDE hard

disk (slave) mode. The options are: Auto (Default), Mode 0, Mode 1, Mode

2, Mode 3, Mode 4.

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VA-503A Mainboard Manual

IDE Secondary Master PIO

Allows an automatic or a manual configuration of the PCI secondary IDE

hard disk (master) mode. The options are: Auto (Default), Mode 0, Mode 1,

Mode 2, Mode 3, Mode 4.

IDE Secondary Slave PIO

Allows an automatic or a manual configuration of the PCI secondary IDE

hard disk (slave) mode. The options are: Auto (Default), Mode 0, Mode 1,

Mode 2, Mode 3, Mode 4.

IDE Primary Master UDMA

Allows you to select the first PCI IDE channel of the first master hard disk

mode or to detect it by the BIOS if the hard disk supports UDMA (Ultra

DMA, faster than DMA). The options are: Auto (Default), Disabled.

IDE Primary Slave UDMA

Allows you to select the first PCI IDE channel of the first slave hard disk

mode or to detect it by the BIOS if the hard disk supports UDMA (Ultra

DMA, faster than DMA). The options are: Auto (Default), Disabled.

IDE Secondary Master UDMA

Allows you to select the second PCI IDE channel of the secondary master

hard disk mode or to detect it by the BIOS if the hard disk supports UDMA

(Ultra DMA, faster than DMA). The options are: Auto (Default), Disabled.

IDE Secondary Slave UDMA

Allows you to select the second PCI IDE channel of the secondary slave

hard disk mode or to detect it by the BIOS if the hard disk supports UDMA

(Ultra DMA, faster than DMA). The options are: Auto (Default), Disabled.

Init Display First

When you install an AGP VGA card and/or a PCI VGA card on the board,

this feature allows you to select the first initiation of the monitor display

from which card. The options are: PCI Slot (Default), AGP.

Onboard FDD Controller

When enabled, the floppy diskette drive (FDD) controller is activated.

The options are: Enabled (Default), Disabled.

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BIOS Setup

Onboard Serial Port 1

If the serial port 1 uses the onboard I/O controller, you can modify your

serial port parameters. If an I/O card needs to be installed, COM3 and

COM4 may be needed. The options are: 3F8/IRQ4 (Default), 3E8/IRQ4,

2F8/IRQ3, 2E8/IRQ3, Disabled.

Onboard Serial Port 2

If the serial port 2 uses the onboard I/O controller, you can modify your

serial port parameters. If an I/O card needs to be installed, COM3 and

COM4 may be needed. The options are: 2F8/IRQ3 (Default), 3E8/IRQ4,

2E8/IRQ3, 3F8/IRQ4, Disabled.

UART 2 Mode

Allows you to select the IR modes if the serial port 2 is used as an IR port.

Set at Standard, if you use COM2 as the serial port as the serial port,

instead as an IR port. The options are: HPSIR, ASKIR, Standard (Default).

IR Function Duplex

This feature is available only if the above item, UART 2 Mode, is set at

ASKIR or HPSIR. It allows you to select the infrared data transaction way.

The options are: Half (Default), Full.

TX, RX inverting enable

This feature is available only if the item, UART 2 Mode, is set at ASKIR or

HPSIR. The feature allows you to select the active signals of the reception

end and the transmission end. This is for technician use only.

The options are: No, Yes (Default); Yes, Yes; No, No; Yes, No.

Onboard Parallel Port

Select from a given set of parameters if the parallel port uses the onboard

I/O controller.

The options are: Disabled, 278/IRQ5, 3BC/IRQ7, 378/IRQ7 (Default).

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VA-503A Mainboard Manual

Onboard Parallel Mode

Allows you to connect with an advanced printer. Select Normal for stan-

dard parallel port (SPP) used on IBM PC/XT, PC/AT and bi-directional

parallel port found on PS/2 system. Select EPP mode for enhanced parallel

port Select ECP mode for Microsoft and HP Extended Capabilities Parallel

Port. Select ECP/EPP mode for both ECP and EPPmodes.

The options are: Normal (Default), EPP, ECP, ECP/EPP.

ECP Mode Use DMA

This feature allows you to select Direct Memory Access (DMA) channel if

the ECP mode selected.The options are: 3 (Default), 1.

Parallel Port EPP Type

This feature allows you to select the EPP type version.

The options are: EPP1.9 (Default), EPP1.7.

Onboard Legacy Audio

When set at Enabled, the feature activated the Legacy audio function.

The options are: Disabled, Enabled (Default).

Sound Blaster

This feature allows you to select the Sound Blaster, if the onboard Legacy

audio chosen.

The options are: Enabled, Disabled (Default).

SB I/O Base Address

This feature allows you to select the SB I/O base address, if the onboard

Legacy audio chosen.

The options are: 220H (Default), 240H, 260H, 280H.

SB IRQ Select

This feature allows you to select the SB IRQ, if the onboard Legacy audio

chosen.

The options are: IRQ 5 (Default), IRQ 7, IRQ 9, IRQ 10.

SB DMA Select

This feature allows you to select the SB DMA channel, if the onboard

Legacy audio chosen.

The options are: DMA 1 (Default), DMA 2, DMA 3, DMA 0.

3 - 20

BIOS Setup

MPU-401

This feature allows you to select MPU-401, if the onboard Legacy audio

chosen.

The options are: Disabled (Default), Enabled.

MPU-401 I/O Address

This feature allows you to select the MPU-401 I/O address, if the onboard

Legacy audio chosen.

The options are: 310-313H, 320-323H, 330-333H (Default), 300-303H.

FM Port (388-38BH)

This feature allows you to select the FM port (388-38BH), if the onboard

Legacy audio chosen.

The options are: Enabled, Disabled (Default).

Game Port (200-207H)

This feature allows you to select the game port (200-207H), if the onboard

Legacy audio chosen.

The options are: Enabled (Default), Disabled.

Supervisor/User Password

To enable the Supervisor/User passwords, select the item from the Standard

CMOS Setup. You will be prompted to create your own password. Type your

password up to eight characters and press Enter. You will be asked to confirm

the password. Type the password again and press Enter. To disable password,

press Enter twice when you are prompted to enter a password. A message

appears, confirming the password is disabled.

Under the BIOS Feature Setup, if Setup is selected under the Security Option

field and the Supervisor/User Password is enabled, you will be prompted

password every time you try to enter the CMOS Setup Utility. If System is

selected and the Supervisor/User Password is enabled, you will be requested

to enter the Password every time when you reboot the system or enter the

CMOS Setup utility.

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VA-503A Mainboard Manual

IDE HDD Auto Detection

The IDE Hard Disk Drive Auto Detection feature automatically configures

your new hard disk. Use it for a quick configuration of new hard drives. This

feature allows you to set the parameters of up to four IDE HDDs. The option

with (Y) are recommended by the system BIOS. You may also keys in your own

parameters instead of setting by the system BIOS. After all settings, press Esc

key to return the main menu. For confirmation, enter the Standard CMOS

Setup feature.

Save and Exit Setup

After you have made changes under Setup, press Esc to return to the main

menu. Move cursor to Save and Exit Setup or press F10 and then press Y to

change the CMOS Setup. If you did not change anything, press Esc again or

move cursor to Exit Without Saving and press Y to retain the Setup settings.

The following message will appear at the center of the screen to allow you to

save data to CMOS and exit the setup utility:

SAVE to CMOS and EXIT (Y/N)?

Exit without Saving

If you select this feature, the following message will appear at the center of the

screen to allow you to exit the setup utility without saving CMOS modifica-

tions:

Quit Without Saving (Y/N)?

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