Acorp 6VIA90A1 User manual

The information presented in this publication has been made
carefully for reliability; however, no responsibility is assumed
for inaccuracies. Specifications are subject to change without
notice.
IBM, PC/AT, and PC/XT are trademarks of International Busi-
ness Machines Corporation.
Pentium is a trademark of Intel Corporation
AWARD is a registered trademark of Award Sofftware Inc.
MS-DOS and WINDOWS NT are registered trademarks of
Microsoft Corporation.
Trademarks and/or registered trademarks are the
properties of their respective owners.
User's Manual Version 1.0
6VIA90A1

Table of Contents
Chapter 1 Introduction ................................................ 1
How this manual is organized ............................. 1
Package checklist ............................................... 2
Chapter 2 Features ...................................................... 3
Features of the mainboard ........................ 4
Chapter 3 Installation .................................................. 5
The 6VIA90A1 Mainboard Layout ............... 7
System Installation Setups ........................ 8
Static Electricity Precaution ...................... 8
Jumper Settings ......................................... 9
System Memory (DIMM modules) ............. 11
DIMM Memory Installation ........................ 12
CPU Installation ........................................ 14
Clearance Requirements .......................... 18
Fan Exhaust .............................................. 18
External Connectors ................................ 19
Note:
If there is any change in the content please
refer to our website.Regarding the BIOS
setting & Driver installation,refer the
web site please.(www. acorp.com.tw)

Chapter 1 Introduction / 1
Introduction
How This Manual is Organized
This manual is divided into the following sections:
Chapter 1 Introduction : Manual information and checklist.
Chapter 2 Features : Information and Specifications con-
cerning this mainboard.
Chapter 3 Installation : Instructions on setting up the board.
The mainboard is a high-performance mainboard based on the ad-
vanced Socket 370 microprocessor, the VGA, Audio , PCI Bus and
the VIA 694X chipset.
1
Chapter 1

2 / Chapter 1 Introduction
Package Checklist
Please check that your package is complete . If you discover any item
damaged or missing , please contact with your retailer immediately.
The 6VIA90A1 mainboard.
The USB2 conector with bracket (option).
1 x IDE UDMA66 ribbon cable.
1 x floppy ribbon cable.
CD drivers and utilities
This user's Manual

Chapter 2 Features / 3
2
Chapter 2
Features
Features of the 6VIA90A1 Mainboard
VIA 694X chipset supports 66/100/133MHz FSB, UltraDMA66
AGP 4X.
Supports Intel's processor designed for socket 370 and package in PPGA/
FCPGA.


Integrated H/W monitor compensation engine.


support "Touch Button Wake up" for soft power on/off and sus-
pendmodemultifunction.(option)

4 / Chapter 2 Features


support Resume by Ring through Modem.


Use 168-Pin DIMM modules (supprts Intel PC100/133-com-
pliant SDRAMs) x3 .
5x PCI Bus slots, and 1 x AMR (Audio Modem Riser) slots.
1 x ISA Bus slots.
All 5 PCI slots support Master mode.
System BIOS support 4 IDE harddisk drivers that don't need de-
vice driver for S/W application.
PCI Bus master IDE interface on board with two connectors sup-
port 4 IDE devices in 2 channel, the PCI IDE Controller supports
PIO Mode 0 to Mode 4, Bus master IDE DMA Mode 2 and Ultra
DMA 66MB
Support PS/2™ mouse Connector.
System BIOS supports LS-120, ZIP driver firmware and Green
feature function, Plug and Play Flash ROM.


AC'97 DAC built into the audio CODEC reduces noise to
improve audio quality and performance for a SNR (singal
to noise ratio) of +90dB. These features greatly improve
voice synthesis and recognition. If more quality is required,
an optional on-board Cyrstal PCI audio improves audio
quality beyond software audio.
Support Software Virus Warning in BIOS.
Support ACPI functionStatic Electricity Precautions.

Chapter 3 Installation / 5
Installation
3
Chapter 3
Jumper
Jumper Refer to pages
JBAT1 - CMOS Clear 10
BSEL0-1 - CPU Type selection 15
JCK1-4 - CPU bus frequency selection 16
J2 - AMR Type Selection 17
J3, J4 - Onboard AC'97 Selection 17
FAN1 - FAN Connector 20
FAN2 - FAN Connector 20
WOL1 - Lan Card Wake Up 26

6 / Chapter 3 Installation
Expansion Slot 

Refer to pages
PCI SLOT 1,2,3,4,5 -32bits PCI SLOT 19
ISA SLOT 1 -16bits ISA SLOT 19
AMR SLOT - Audio Modem Riser Slot 19
Connectors Refer to pages
PS1 - PS/2 Mouse port (UP) 20
PS1 - PS/2 AT
(mini DIM) Keyboard port (DOWN) 20
COM1 - COM 1 serial port 20
COM2 - COM 2 serial port 20
USB - Universal Serial BUS Ports 1 & 2 20
USB2 - Universal Serial BUS Ports 3 & 4 20
PRINT - Parallel port 20
FDC - FLOPPY connector 20
IDE1 - Primary IDE connector 22
IDE2 - Secondary IDE connector 22
J6 - IrDA Connector 23
PANEL1 - HDD LED 24
PANEL1 - SMI Switch 24
PANEL1 - Reset Switch 25
PANEL1 - Speaker Connector 25
PANEL1 - Power LED 25
PANEL1 - ATX Power switch 25
PW1 - ATX Power Connector 25
CD_IN1 - Audio Connector 26
CD_IN2 - Audio Connector 26

Chapter 3 Installation / 7
The 6VIA90A1 Mainboard Layout
USB
COM1
COM2
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: Mouse
Printer
PANEL1 J6
FAN1
BSE1
JBAT1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
JVI02

8 / Chapter 3 Installation
The 6VIA90A1 Mainboard Layout
System Installation Setup
Before using your computer, you must finish the following steps:
1. Set jumpers on mainboard
2. Install SDRAM module.
3. Install the Processor.
4. Connect Ribbon Cables, Cabinet Wires, and Power supply.
5. Install Add on Cards.
6. Setup the BIOS software.
Static Electricity Precaution
Keep the mainboard and other system components in their anti-
static packaging until you are ready to install them.
Do all preparative work on a static-free surface with the main
board components facing up.
Unplug your computer when working on the inside.
Wear an Anti-static wrist strap.
Hold the system components, boards or cards by its edges only.
Be careful not to touch any of IC chips, circuitry, contacts or
connections, especially gold contacts on the mainboard.

Chapter 3 Installation / 9
Jumper Settings
Jumpers
The several hardware setting are made through the use of jumper
caps to connect jumper pins (Jxx) on the mainboard. See " Map of the
mainboard" for locations of jumpers.
The jumper settings will be described numerically such as [----], [1-2],
[2-3] for no connection, connect pins 1 & 2, and connect pins 2 & 3
respectively. Pin 1 for our mainboard is always on top one or on the
left when holding the mainboard with the keyboard away from
yourself. "P1" is written besides pin 1 on jumper with three pins. The
jumpers will also be shown graphically such as to connect pin
1&2 and to connect 2&3. Jumpers with two pins will be shown
as for Short (on )and for Open (off).For manufacturing
simplicity may be sharing pins from other groups. Use the diagrams
in this manual instead of following the pin layout on the board. Set-
tings with two jumper numbers require that both jumpers be moved
together. To connect the pin, simply place a plastic jumper cap over
the two pins as diagrammed.

10 / Chapter 3 Installation
USB
COM1
COM2
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: Mous e
Printer
FAN1
BSE1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
PAN EL1 J6
JBAT1
JVI02
Real Time Clock (RTC) RAM - JBAT1 :
The CMOS RAM is powered by the onboard button cell battery. To
clear the RTC data:
(1)Turn off your computer, (2) Move this jumper to "2-3Pin Clear
Data", (3) Move the jumper back to "Default", (4) Turn on your
computer, (5) Hold down <Delete > during bootup and enter BIOS
setup to re-enter user Preferences.
P1
P1
JBAT1 CMOS Clear
1-2 (default) Normal
2-3 Clear CMOS

Chapter 3 Installation / 11
System Memory ( DIMM Module)
This 6VIA90A1 main board supports three 168 pin DIMM of 16
MB, 32 MB, 64 MB, 128 MB ,256MB to form a memory size be-
tween 16MB to 256MB.
The DRAM can be either Intel PC133-compliant SDRAMs.
Install memory in any or all Banks in Combination:
Bank Memory module
DIMM 1 16MB,32MB,64MB,128MB,256MB
( Bank 0-1 ) 168 pin,3.3v SDRAM / EDO RAM
DIMM 2 16MB,32MB,64MB,128MB,256MB
( Bank 2-3 ) 168 pin 3.3v,SDRAM / EDO RAM
DIMM 3 16MB,32MB,64MB,128MB,256MB
( Bank 4-5 ) 168 pin 3.3v,SDRAM / EDO RAM
Total System Memory(Max 768MB)
Note :


At the time this user's manual was written, 256MB
DIMM's are only available as double-sided registered
memory (128Mbit cells).


The motherboard operates at 133MHz, therefore
PC133-compliant modules must be used because of the
strict timing issues involved under this speed.

12 / Chapter 3 Installation
USB
COM1
VGA
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: Mouse
Printer
FAN1
BSE1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
PAN EL1 J6
JBAT1
JVI02
DIMM Memory Installation
Insert the module (s) as shown. Because the number pins are differ-
ent on either side of the breaks,the module will only fit in the ori-
entation as shown. SDRAM DIMM modules have different pin con-
tacts on each side and therefore have a higher pin density.
168 Pin DIMM Socket
88 pins 60 pins 20 pins

Chapter 3 Installation / 13
The Dual Inline Memory Module (DIMM) memory module must
be 3.3v Extended Data Output (EDO) DRAM or SDRAM. You can
identify the type of DIMM module by the illustration below:
168 Pin DRAM DIMM Notch Key Definitions
The notch on the DIMM module will shift between left, center, or
right to identify the type and also to prevent the wrong type to be
inserted into the DIMM slot on the Mainboard. You must ask your
retailer for Specifications before purchasing.
Four clock signals are supported on this mainboard
RFU Unbuffered
Buffered
5.0V Reserved
3.3V
DRAM Key Position Voltage Key Position

14 / Chapter 3 Installation
USB
COM1
COM2
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: Mouse
Printer
FAN1
BSE1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
PANEL1 J6
JBAT1
JVI02
CPU Installation
The motherboard provides a ZIF socket 370. The CPU that came with
the motherboard should have a fan attached to it to prevent over-
heating . If this is not the case then purchase a fan before you turn on
your system.
To install a CPU , first turn off your system and remove its cover.
Locate the ZIF socket and open it by first pulling the lever sideways
away from the socket then upwards to a 90-degree right angle. Insert
the CPU with the correct orientation shown . The notched corner
should point towards the end of lever. Because the CPU has a corner
pin for two of the four corners, the CPU will only fit in the orienta-
tion as shown.
Notch

Chapter 3 Installation / 15
USB
COM1
COM2
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: Mouse
Printer
FAN1
BSE1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
PA NE L 1 J6
JBAT1
JVI02
CPU Type Selection -BSEL0, BSEL1
Current PCI bus is limited to 33MHz, socket370 Celeron proces-
sors limited to 66MHz, and SDRAM limited to the DIMM type 66/
100/133MHz. Other settings are for experienced users only.
BSEL0 BSEL1
Auto detected b CPU
100Mhz Run 133Mhz
(test onl )
66Mhz Run 100Mhz
(test onl )
66MHz ONLY
BSEL1
BSEL0
BSEL1
BSEL0
BSEL1
BSEL0
BSEL1
BSEL0

16 / Chapter 3 Installation
USB
COM1
COM2
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: Mouse
Printer
FAN1
BSE1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
PA NE L 1 J6
JBAT1
JVI02
CPU External (Bus) Frequency Selection -JCK1,
JCK2, JCK3, JCK4
The JCK1~4 jumpers is used to set PCI and CPU external bus clock.
CLK PCI JCK1 JCK2 JCK3 JCK4
132.99 33.25 1111
124310111
150 37.5 1011
140350011
105351101
109.99 36.66 0101
114.99 38.33 1001
120400001
100.23 33.41 1110
68.0134.010110
112.01 37.34 1010
10334.330010
66.8233.411100
83.3141.650100
7537.51000
80400000
1:1-2 SHORT
0:2-3 SHORT
NOTE:
In order to enhance clock generator, it needs to change the
Jum ter setting as follow.

Chapter 3 Installation / 17
USB
COM1
COM2
AMR SLOT
AGP1
JACK1
JACK2
JACK3
B: K/B
T: M o us e
Printer
FAN1
BSE1
JCK1
JCK2
JCK3
JCK4
WOL1 FAN2
GAME1
BIOS
ISA SLOT1
VIA
VIA
PCI SLOT2
PCI SLOT1
PCI SLOT3
PCI SLOT4
PCI SLOT5
BSE0
J4
J3
J2
PA N EL 1 J6
JBAT1
JVI0 2
J2
O N Primar
OFF Secondar
P1
P1
Onboard AC'97 Function Selection : J3, J4
Audio/Modem Riser (AMR) Function Selection :
J3/J4
OFF Disabled
ON Enabled
P1
J3
J4
P1
J3
J4

18 / Chapter 3 Installation
Clearance Requirements
To maintain proper airflow once the processor is installed on the
mainboard, the processor and fan heatsink require certain space
clearances. The clearance above the processor must be at least 0.3
inches. The clearance on at least 3 of 4 sides of the processor and fan
heatsink must be at least 0.2 inches. All cables (for Floppy drive,Hard
drive,CD-ROM,and so on) must be routed clear of the processor and
its airspace.
Fan Exhaust
The processor must be kept cool by using a processor with heatsink
and fan attached . The temperature of the air filled with the fan/
heatsink cannot exceed 45 OC(113 OF ) . The ambient or room tem-
perature must be below 37 OC ( 99 OF) .