DFI AK74-SC User manual

AK74-SC Rev. AF+
AK74-SU Rev.AF+
AK74-EC Rev. A+
AK74-AC Rev. A+
System Board
Users Manual
43830043

Copyright
This publication contains information that is protected by copyright.
No part of it may be reproduced in any form or by any means or
used to make any transformation/adaptation without the prior
written permission from the copyright holders.
This publication is provided for informational purposes only. The
manufacturer makes no representations or warranties with respect to
the contents or use of this manual and specifically disclaims any
express or implied warranties of merchantability or fitness for any
particular purpose.The user will assume the entire risk of the use or
the results of the use of this document. Further, the manufacturer
reserves the right to revise this publication and make changes to its
contents at any time, without obligation to notify any person or
entity of such revisions or changes.
© 2000. All Rights Reserved.
Trademarks
Microsoft®MS-DOS®, WindowsTM, Windows®95, Windows®98,
Windows®98 SE, Windows®ME, Windows®2000 and Windows
NT®4.0 are registered trademarks of Microsoft Corporation. AMD,
AthlonTM and DuronTM are registered trademarks of Advanced Micro
Devices, Inc. VIA is a registered trademark of VIA Technologies, Inc.
Award is a registered trademark of Award Software, Inc. Other
trademarks and registered trademarks of products appearing in this
manual are the properties of their respective holders.
Caution:
Danger of explosion if battery incorrectly replaced.
Replace only with the same or equivalent type recommended by the
manufacturer.
Dispose of used batteries according to the battery manufacturers
instructions.

FCC and DOC 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.

Table of Contents
Read Me First..........................................................
Chapter 1 - Introduction
1.1 Features and Specifications..................................................................................
1.2 Package Checklist.........................................................................................................
Chapter 2 - Hardware Installation
2.1 System Board Layout .............................................................................................
2.2 System Memory.............................................................................................................
2.3 Jumper Settings for Clearing CMOS Data..........................................
2.4 Jumper Settings for the Onboard Audio Codec
(AK74-SC/EC/AC only)..........................................................................................
2.5 Jumper Settings for the Onboard PCI Audio
(AK74-SU only)..............................................................................................................
2.6 Jumper Settings for Selecting the CPUs Front Side Bus
(AK74-AC only).............................................................................................................
2.7 Jumper Settings for Selecting the USB Power...................................
2.8 Ports and Connectors.............................................................................................
Chapter 3 - Award BIOS Setup Utility
3.1 The Basic Input/Output System.....................................................................
3.1.1 Standard CMOS Features.............................................................
3.1.2 Advanced BIOS Features..............................................................
3.1.3 Advanced Chipset Features ......................................................
3.1.4 Integrated Peripherals.........................................................................
3.1.5 Power Management Setup............................................................
3.1.6 PnP/PCI Configurations....................................................................
3.1.7 PC Health Status...................................................................................
3.1.8 Frequency/Voltage Control............................................................
3.1.9 Load Fail-Safe Defaults.....................................................................
3.1.10 Load Optimized Defaults..............................................................
3.1.11 Set Supervisor Password...............................................................
3.1.12 Set User Password..............................................................................
3.1.13 Save & Exit Setup.................................................................................
3.1.14 Exit Without Saving..............................................................................
3.2 Updating the BIOS.....................................................................................................
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Chapter 4 - Supported Softwares
4.1 Desktop Management Interface.....................................................................
4.2 VIA Hardware Monitor............................................................................................
4.3 VIA Service Pack..........................................................................................................
4.4 Audio Drivers and Software Application...............................................
4.5 Drivers and Utilities Installation Notes.....................................................
Appendix A - Using the Suspend to RAM
Function
A.1 Using the Suspend to RAM Function........................................................
Appendix B - System Error Messages
B.1 POST Beep.......................................................................................................................
B.2 Error Messages..............................................................................................................
Appendix C - Troubleshooting
C.1 Troubleshooting Checklist....................................................................................
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Introduction
1
6
Read Me First
This page contains a summary of the important notes that must be
given special attention to prior to using the system board.
CPU Temperature Protection
The CPU Temperature Protection function has the capability of
monitoring the CPUs temperature during system boot-up. Once it
has detected that the CPUs temperature exceeded the CPU
temperature limit defined in the BIOS, the system will automatically
power-off after 5 warning beeps.
CPU Fan Protection
The CPU Fan Protection function has the capability of monitoring the
CPU fan during system boot-up and will automatically power-off the
system once it has detected that the CPU fan did not rotate. This
preventive measure has been added to protect the CPU from
damage and insure a safe computing environment.
Over Voltage
The Over Voltage function allows you to manually adjust to a higher
core voltage that is supplied to the CPU. Although this function is
supported, we do not recommend that you use a higher voltage
because unstable current may be supplied to the system board
causing damage.
CPU Overclocking
The CPU Overclocking function allows you to adjust the processors
bus clock. However, overclocking may result to the processors or
systems instability and are not guaranteed to provide better system
performance.
System Memory
The system board supports both VCM and PC SDRAM DIMMs. If
you are using more than one DIMM, make sure you inser t the same
type of DIMMs into the DIMM sockets. Using different types (VCM
or PC SDRAM) of DIMMs may cause problems.

1
Introduction
7
5VSB Power
 If you are using the (1) Wake-On-LAN and/or (2) Wake-On-
Ring (internal modem) functions, the 5VSB power source of your
power supply must support ≥720mA.
 If you are using the Suspend to RAM function, the 5VSB power
source of your power supply must support ≥1A.
Drivers
Make sure to reboot the system after each driver installation.
Problems will occur if you reboot only after installing all the drivers.

Introduction
1
8
1.1 Features and Specifications
1.1.1 Features
Chipset
 VIA®KT133 - VT8363 and VT82C686A (AK74-SC/SU)
 VIA®KT133 - VT8363 and VT82C686B (AK74-EC)
 VIA®KT133A - VT8363A and VT82C686B (AK74-AC)
Processor
The system board is equipped with Socket-A for 462-pin PGA
processor. It is also equipped with a switching voltage regulator that
automatically detects 1.100V to 1.850V.
 AMD AthlonTM/DuronTM 100/133MHz (200/266MHz DDR) FSB
processor (600/650/700/750/800/850/900/950MHz, 1GHz or
future processors). Only AK74-AC supports 133MHz (266MHz
DDR) FSB processor.
System Memory
 Supports up to 1.5GB using VCM (Virtual Channel Memory) or
PC SDRAM DIMM (unbuffered or registered).
- Registered DIMM - PC-100 only.
 Three 168-pin DIMM sockets
 Uses x64 or x72 PC SDRAM, 3.3V
- PC-100 SDRAM DIMM for 100MHz memory bus
- PC-133 SDRAM DIMM for 133MHz memory bus
 L2 cache memory
- DuronTM processor: built-in 64KB Level 2 pipelined burst
cache
- AthlonTM processor: built-in 256KB Level 2 pipelined burst
cache
 ECC supported (uses x72 PC SDRAM DIMM)
Chapter 1 - Introduction

1
Introduction
9
Expansion Slots
The system board is equipped with 1 universal AGP slot. AGP is an
interface designed to support high performance 3D graphics cards. It
utilizes a dedicated pipeline to access system memory for texturing,
z-buffering and alpha blending.The universal AGP slot supports AGP
2x with up to 533MB/sec. bandwidth and AGP 4x with up to
1066MB/sec. bandwidth for 3D graphics applications. AGP in this
system board will deliver faster and better graphics to your PC.
The system board is also equipped with 4 dedicated PCI slots, 1
shared PCI/ISA slot and 1 AMR slot. AMR (Audio/Modem Riser) is
an interface designed for installing an audio riser card, modem riser
card or audio/modem riser card that is compliant to the AMR
specification.
Onboard Audio Features (AK74-SC/EC/AC only)
 Supports Microsoft®DirectSound/DirectSound 3D
 AC97 supported with full duplex, independent sample rate con-
verter for audio recording and playback
Onboard PCI Audio Features - Creative ES1373 (AK74-SU only)
 Supports Microsoft®DirectSound /DirectSound 3D / DirectMusic
SW acceleration
 64 voice wavetable synthesizer
 Hardware SoundBlaster Pro for Windows DOS Box and
standard Microsoft Windows Sound 2.0
 Digital I/O compatible with consumer mode (SPDIF)
 Downloadable sound (DLS) level-1
DIMMs
2MBx64/x72
4MBx64/x72
8MBx64/x72
Memory Size
16MB
32MB
64MB
DIMMs
16MBx64/x72
32MBx64/x72
64MBx64/x72
Memory Size
128MB
256MB
512MB
Note:
If you are using more than one DIMM, make sure you insert
the same type of DIMMs into the DIMM sockets. Using
different types (VCM or PC SDRAM) of DIMMs may cause
problems.

Introduction
1
10
ATX Double Deck Ports (PC 99 color-coded connectors)
 Two USB ports
 Two NS16C550A-compatible DB-9 serial ports
 One SPP/ECP/EPP DB-25 parallel port
 One mini-DIN-6 PS/2 mouse port
 One mini-DIN-6 PS/2 keyboard port
 One game/MIDI port
 Three audio jacks: line-out, line-in and mic-in
Connectors
 One connector for 2 additional external USB ports
 One connector for IrDA interface
 Two IDE connectors
 One floppy drive interface supports up to two 2.88MB floppy
drives
 One 20-pin ATX power supply connector
 One Wake-On-LAN connector
 One Wake-On-Ring connector
 CPU, chassis and second chassis fan connectors
 Three internal audio connectors (AUX-in, CD-in and TAD)
PCI Bus Master IDE Controller
 Two PCI IDE interfaces support up to four IDE devices
 Supports ATA/33 and ATA/66 hard drives (AK74-SC/SU)
Supports ATA/33, ATA/66 and ATA/100 hard drives
(AK74-EC/AC)
 PIO Mode 3 and Mode 4 Enhanced IDE (data transfer rate up
to 16.6MB/sec.)
 Bus mastering reduces CPU utilization during disk transfer
 Supports ATAPI CD-ROM, LS-120 and ZIP
IrDA Interface
The system board is equipped with an IrDA connector for wireless
connectivity between your computer and peripheral devices. It
supports peripheral devices that meet the HPSIR and ASKIR
standard.