Acrosser Technology AR-B1891 User manual

AR-B1891
Socket 479 Pentium®M
INDUSTRIAL GRADE
CPU BOARD
User’ s Guide
Edition: 1.1
Book Number: AR-B1891-06.0510

Table of Contents
0. PREFACE.................................................................................................................................................................... 2
0.1 COPYRIGHT NOTICE AND DISCLAIMER.....................................................................................................................................2
0.2 WELCOME TO THE AR-B1891 CPU BOARD................................................................................................................................2
0.3 BEFORE YOU USE THIS GUIDE...................................................................................................................................................2
0.4 RETURNING YOUR BOARD FOR SERVICE.................................................................................................................................2
0.5 TECHNICAL SUPPORT AND USER COMMENTS........................................................................................................................3
0.6 STATIC ELECTRICITY PRECAUTIONS ........................................................................................................................................3
1. INTRODUCTION.......................................................................................................................................................... 4
1.1 PACKING LIST................................................................................................................................................................................4
1.2 SPECIFICATIONS...........................................................................................................................................................................5
1.3 BLOCK DIAGRAM...........................................................................................................................................................................6
2. INSTALLATION........................................................................................................................................................... 7
2.1 AR-B1891'S BOARD DIMENSIONS ...............................................................................................................................................7
2.2 CPU INSTALLATION ......................................................................................................................................................................9
2.3 MEMORY INSTALLATION............................................................................................................................................................10
3. CONNECTION........................................................................................................................................................... 11
3.1PS2 KEYBOARD & MOUSE（KBMS1）......................................................................................................................................11
3.2USB CONNECTOR（USB1）.......................................................................................................................................................11
3.3EXTERNAL USB HEADER（USB3）...........................................................................................................................................12
3.4 PARALLEL PORT CONNECTOR（LPT1）.................................................................................................................................12
3.5SERIAL PORT CONNECTOR（COM1）.....................................................................................................................................13
3.6 EXTERNAL SERIAL PORT HEADER（COM2~COM6）.............................................................................................................13
3.7 VGA CONNECTOR （VGA1）....................................................................................................................................................14
3.8 RJ- 45 & USB CONNECTOR（CN2）..........................................................................................................................................14
3.9 DVI-D CONNECTOR（CN1）......................................................................................................................................................15
3.10 AUDIO LINE OUT∕LINE IN∕MIC HEADER（J4）..................................................................................................................15
3.11 CD IN HEADER（J6）................................................................................................................................................................15
3.12 HARD DISK（IDE）CONNECTOR (IDE1, IDE2).......................................................................................................................16
3.13 COMPACT FLASH CONNECTOR（CFB1）.............................................................................................................................18
3.14 COMPACT FLASH CONNECTOR MASTER∕SLAVE SELECT HEADER（JP3）..................................................................19
3.15 CPU CLOCK SELECT HEADER（JCLK1）..............................................................................................................................19
3.16 INTERNAL BUZZER（BZ1）......................................................................................................................................................19
3.17 CPU FAN POWER CONNECTOR（FAN1, FAN2, FAN3）.......................................................................................................19
3.18 COMS BATTERY HEADER（JBAT1）......................................................................................................................................20
3.19 18, 24 BITS LVDS CONNECTOR（LCD1, LCD4）...................................................................................................................20
3.20 LVDS INTERVER CONNECTOR（J7, JJ1）.............................................................................................................................21
3.21 LCD PANEL TYPE SELECT （S1）..........................................................................................................................................22
3.22 DDR SDRAM SOCKET（DIMM1, DIMM2）...............................................................................................................................22
3.23 MINI PCI SLOT（MPCIB1）.......................................................................................................................................................22
3.24 PCI SLOT（PCI1）.....................................................................................................................................................................22
3.25 PCI SELECT HEADER（JP2）..................................................................................................................................................22
3.26 ATX∕ATX_12V POWER CONNECTOR（ATX1, PW1）..........................................................................................................23
3.27 PANEL HEADER（J1）..............................................................................................................................................................23
4. WATCHDOG TIMER CONFIGURATION.................................................................................................................. 24
4.1 WATCHDOG TIMER SETTING ....................................................................................................................................................24
5. BIOS CONSOLE........................................................................................................................................................ 25
5.1 MAIN SETUP.................................................................................................................................................................................25
5.2 ADVANCED CHIPSET SETUP.....................................................................................................................................................27
5.3 POWER SETUP............................................................................................................................................................................28
5.4 PERIPHERALS SETUP ................................................................................................................................................................29
5.5 PNP/PCI SETUP...........................................................................................................................................................................30
5.6 PC HEALTH SETUP .....................................................................................................................................................................31
5.7 BOOT SETUP ...............................................................................................................................................................................32
5.8 EXIT SETUP..................................................................................................................................................................................33
5.9 BIOS UPDATE ..............................................................................................................................................................................34
APPENDIX A. ADDRESS MAPPING............................................................................................................................ 35
IO ADDRESS MAP..............................................................................................................................................................................35
MEMORY MAP....................................................................................................................................................................................35
APPENDIX B. INTERRUPT REQUEST (IRQ)............................................................................................................... 36

0. PREFACE
0.1 COPYRIGHT NOTICE AND DISCLAIMER
This document is copyrighted, 2002, by Acrosser Technology Co., Ltd. All rights are reserved. No part
of this manual may be reproduced, copied, transcribed, stored in a retrieval system, or translated into
any language or computer language in any form or by any means, such as electronic, mechanical,
magnetic, optical, chemical, manual or other means without the prior written permission or original
manufacturer.
Acrosser Technology assumes no responsibility or warranty with respect to the content in this manual
and specifically disclaims any implied warranty of merchantability or fitness for any particular purpose.
Furthermore, Acrosser Technology reserves the right to make improvements to the products described
in this manual at any times without notice. Such revisions will be posted on the Internet
(WWW.ACROSSER.COM) as soon as possible.
Possession, use, or copy of the software described in this publication is authorized only pursuant to
valid written license fromAcrosser or an authorized sub licensor.
ACKNOWLEDGEMENTS
Acrosser, AMI, IBM PC/AT, ALI, Windows 3.1, MS-DOS…are registered trademarks.
All other trademarks and registered trademarks are the property of their respective owners.
0.2 WELCOME TO THE AR-B1891 CPU BOARD
This guide introduces theAcrosser AR-B1891 CPU Board.
Use information provided in this manual describes this card’s functions and features. It also helps you
start, set up and operate your AR-B1891. General system information can also be found in this
publication.
0.3 BEFORE YOU USE THIS GUIDE
Please refer to the Chapter 3, “Setting System,” in this guide, if you have not already installed this
AR-B1891. Check the packing list before you install and make sure the accessories are completely
included.
AR-B1891 CD provides the newest information regarding the CPU card. Please refer to the files of
the enclosed utility CD. It contains the modification and hardware & software information, and adding
the description or modification of product function after manual printed.
0.4 RETURNING YOUR BOARD FOR SERVICE
If your board requires any services, contact the distributor or sales representative from whom you
purchased the product for service information. If you need to ship your board to us for service, be sure
it is packed in a protective carton. We recommend that you keep the original shipping container for this
purpose.
You can help assure efficient servicing for your product by following these guidelines:
1. Include your name, address, daytime telephone, facsimile number and E-mail.
2. A description of the system configuration and/or software at the time of malfunction.
3. A brief description of the problem occurred.

0.5 TECHNICAL SUPPORT AND USER COMMENTS
Users comments are always welcome as they assist us in improving the quality of our products and the
readability of our publications. They create a very important part of the input used for product
enhancement and revision.
We may use and distribute any of the information you provide in any way appropriate without incurring
any obligation. You may, of course, continue to use the information you provide.
If you have any suggestions for improving particular sections or if you find any errors on it, please send
your comments to Acrosser Technology Co., Ltd. or your local sales representative and indicate the
manual title and book number.
Internet electronic mail to: [e-mail]
[email protected]
0.6 STATIC ELECTRICITY PRECAUTIONS
Before removing the board from its anti-static bag, read this section about static electricity precautions.
Static electricity is a constant danger to computer systems. The charge that can build up in your body
may be more than sufficient to damage integrated circuits on any PC board. It is, therefore, important to
observe basic precautions whenever you use or handle computer components. Although areas with
humid climates are much less prone to static build-up, it is always best to safeguard against accidents
that may result in expensive repairs. The following measures should be sufficient to protect your
equipment from static discharge:
Touch a grounded metal object to discharge the static electricity in your body (or ideally, wear a
grounded wrist strap).
When unpacking and handling the board or other system components, place all materials on an
anti-static surface.
Be careful not to touch the components on the board, especially the “golden finger” connectors on
the bottom of the board.

1. INTRODUCTION
Welcome to the AR-B1891 Embedded ATX Single Board Computer. The AR-B1891 Pentium®M
embedded board incorporates the Intel®advanced 855GME Chipset that supports processors from
600MHz to 2.0MHz in 479-ball Micro-FCBGApackage with a front size bus of 400MHz.
Graphics display functionality is provided by the ATI mobility chipset VGA controller that supports CRT
display and LVDS interface with 24-bit panel specifications. Ethernet connectivity comes from the
ICH4-integrated Ethernet 10/100 Ethernet controller.
Two DDR DIMM sockets supports up to 2GB of memory. Two Serial ports are supported. There are two
IDE connectors – IDE1 supporting UDMA33/66/100 and IDE2 with UDMA33 while supporting a CF
Type II socket for its slave channel.
Other I/O features include four USB ports connector and two USB port using pin headers. Expansion
slots composed of one PCI and one Mini PCI slot. AR-B1891 uses a 20-pin ATX power and a 4 pin
+12V input connector.
1.1 PACKING LIST
In addition to this User's Manual, the AR-B1891 package includes the following items:
The quick setup manual
AR-B1891 EmbeddedATX Single Board
Software utility CD x 1
5.25” IDE HDD ATA100Cable x 1（Part NO.190030363-02）
2.5” IDE HDD Cable x 1（Part NO.190030079）
Serial port Cable x 1（Part NO.190030379）
Audio interface Cable x 1（Part NO.190030403）
USB port Cable x 1（Part NO.190030343-01,Option）
Serial port Y Cable（NO.190030526-G, Option）

1.2 SPECIFICATIONS
Model Name AR-B1891
CPU Type Intel Pentium M Processor, Ultra Low Voltage, at HFM
core frequency of 600MHz ~ 2.0GHz（Socket 478）
CPU Voltage 0.700 ~ 1.708V
CPU Frequency 400MHz
Chipset GMCH：Intel 82855GME, 732-pin Micro-FCBGA
ICH4：Intel 82801DB, 421-pin BGA, FWH
BIOS Award BIOS, supportACPI function
Cache 1M Level 2 cache
Display GRAPHICS：ATI Mobility RADEON 9000
1. Support CRT D-SUB 15-pin female connector
2. Support One LVDS interface（DF13 Socket, Max
24bit﹚
3. Support DVI-D 24pin female connector
LAN ICH4 integrated LAN controller﹙10/100Mb﹚+ Phy
Intel 85856ET&RJ45 connector
Audio ICH4 Built-in Sound controller + AC97 code ALC202A
2 channel ﹙Line-out, Line-in,MIC. ﹚pin header
﹙2x6pin, pitch 2.54mm﹚
Memory Type 2 x DDR 184-pin DIMM 2.5V
﹙DDR200/266/333MHz﹚
,
Max. capacity 2GB
LPC I/O Winbond 83627HF
1. Support Parallel Port x 1﹙D-SUB 25-pin﹚
2. Support series Port x 2﹙COM1：D-SUB 9-pin,
COM2：pin header 2x5-pin pitch 2.0﹚
3. Support Hardware monitor
Fintek F81216DG
Support series port x 4﹙COM3,COM4：pin
header 2x10-pin pitch 2.0, COM5,COM6：pin
header 2x10-pin pitch 2.0﹚
RTC/CMOS ICH4 Built-in
Battery Lithium Battery
KB&MS Controller Winbond 83627HF built-in keyboard & mouse
controller﹙PS2 &6-pin MINI-DIN﹚
IDE ICH4 Built-in
1. IDE1, 40-pin box header﹙UDMA 33/66/100﹚
2. IDE2, 44-pin box header﹙UDMA 33﹚
Compact Flash Type II, using IDE2 channel
USB 6 port, USB 2.0/1.1, ﹙Rear I/O panel﹚,& 2x10-pin
header pitch 2.54mm
WatchDog Timer 0~60sec
Power Connector 20-pin ATX Power input + The Pentium 4 ATX power
include another 2x2 pin+12V input connector
Expansion Slots PCI slot x1, MiniPCI slot x1
From factor 240x190mm

1.3 BLOCK DIAGRAM
Intel Pentium M Processer
Socket_478 (U6)
HUB LINK
Intel 855GME
(U7)
PCI BUS
ATA 33/66/100
PCI SLOT(PCI1) ,MINI
PCI SLOT(MPCIB1)
IDE SECONDARY(IDE2) ,
COMPACT FLASH(CFB1)
HOST
BUS
AC'97 LINK
PARALLEL
AGP
Bus
ATI
REDAON
(UA1)
USB
2.0 *
6
MOUSE
DDR BUS
Intel ICH4
(U14)
KEYBOARD
USB 2.0
LAN PHY
FWH
Bios
(U22)
ATA 33/66/100
LPC BUS
LAN
82562EM
(U12)
SERIAL
3~4
LVDS I/F
LPC BUS
R,G,B I/F
SERIAL
5~6
LVDS I/F
AC'97 CODEC (U18)
PANEL
FOR ATI
(LCD4)
AR-B1891 V1.1
BLOCK
DUAGRAM
PANEL FOR
855GME
(LCD1)
DDR I SOCKET* 2
200/266/333 MHz
IDE PRIMARY(IDE1)
SERIAL 2
Fintek
F81216 (U27)
RJ45
R,G,B I/F
LAN Diff
Super I/O
W83627HF (U17)
CRT
(VGA1)
SERIAL 1

2. INSTALLATION
This chapter describes how to install the AR-B1891. At first, the layout of AR-B1891 is shown, and the
unpacking information that you should be careful is described. The jumpers and switches setting for the
AR-B1891’s configuration are as below.
2.1 AR-B1891'S BOARD DIMENSIONS

2.2 CPU INSTALLATION
The AR-B1891 embedded board supports a Socket 478 processor socket for Intel®Pentium®M or
Celeron®M processors.
The processor socket comes with a screw to secure the processor. As shown in the left picture below,
loosen the screw first before inserting the processor. Place the processor into the socket by making sure
the notch on the corner of the CPU corresponds with the notch on the inside of the socket. Once the
processor has slide into the socket, fasten the screw. Refer to the figures below.
After you have installed the processor into the socket, check if the jumpers for the CPU type and speed are
correct.

2.3 MEMORY INSTALLATION
The AR-B1891 embedded board supports two DDR memory sockets for a maximum total memory of
2GB in DDR memory type. The memory module capacities supported are 64MB, 128MB, 256MB,
512MB and 1GB. The following table lists the supported DDR DIMM configurations. Intel 855GME
supports configurations defined in the JEDEC DDR DIMM specification only (A,B,C). Non-JEDEC
standard DIMMs such as double-sided x16 DDR SDRAM DIMMs are not supported.
Density 64M bit 128Mbit 256Mbit 512Mbit
Device
Width X8 X16 X8 X16 X8 X16 X8 X16
Single/
Double SS/DS SS/DS SS/DS SS/DS SS/DS SS/DS SS/DS SS/DS
184-pin
DDR 64M /
128M 32M / NA 128M/ 256M 64M / NA 256M/ 512M 128M/ NA 256M/ 1024M 256M/ NA
Supported DDRM DIMM Configurations
To install the DDR modules, locate the memory slot on the embedded board and perform the following
steps:
1. Hold the DDR module so that the key of the DDR module align with those on the memory slot.
2. Gently push the DDR module in an upright position until the clips of the slot close to hold the DDR
module in place when the DDR module touches the bottom of the slot.
3. To remove the DDR module, press the clips with both hands.

3. CONNECTION
The connectors on AR-B1891 allows you to connect external devices such as USB devices, serial port
drives, hard disk devices, printers, etc. The following table lists the connectors on AR-B1891 and their
respective functions.
3.1 PS2 KEYBOARD & MOUSE（KBMS1）
To install a PS/2 port keyboard and mouse, plug the mouse to the upper port（green）and the keyboard
to the lower port（purple）.
PIN SIGNAL PIN SIGNAL
1 KBDAT 7 MSDAT
2 N.C. 8 N.C.
3 GND 9 GND
4 +5V 10 +5V
5 KBCLK 11 MSCLK
12 3
4
6 5
7
8
10 9
12 11
KB MS1 6 N.C. 12 N.C.
3.2 USB CONNECTOR（USB1）
Before you connect your device into USB connectors, please make sure your devices such as USB
keyboard, mouse, scanner, zip, speaker …etc. have a standard USB interface, Also make sure your OS
supports USB controller. If your OS doesn’t support USB controller, please contact OS vendor for
possible patch or driver upgrade. For more information please contact your OS or devices vendors.
PIN SIGNAL PIN SIGNAL
1 +5V 5 +5V
2 USB2- 6 USB3-
3 USB2+ 7 USB3+
1 2 3 4
5 6 7 8
USB1 4 GND 8 GND
PS2
MOUSE
PS2
KEYBOARD

3.3 EXTERNAL USB HEADER（USB3）
The following table shows the pin outs of the USB pin headers connectors. Overall, the two pin headers
support four USB ports（USB 2.54 compliant）.
PIN SIGNAL PIN SIGNAL
1 +5V 2 +5V
3 USB4- 4 USB5-
5 USB4+ 6 USB5+
1
10 2
9
USB3
7 GND 8 GND
3.4 PARALLEL PORT CONNECTOR（LPT1）
The parallel port allows connection of a printer, scanner and other peripheral devices.
LPT1
PIN SIGNAL PIN SIGNAL
1 STB# 14 AFD#
2 PD0 15 ERROR#
3 PD1 16 INIT#
4 PD2 17 SLIN#
5 PD3 18 GND
6 PD4 19 GND
7 PD5 20 GND
8 PD6 21 GND
9 PD7 22 GND
10 ACK# 23 GND
11 BUSY# 24 GND
12 PE 25 GND
13 SLCT

3.5 SERIAL PORT CONNECTOR（COM1）
Devices like mouse, modems …etc, can be connected to serial port.
1 5
69
COM1
PIN SIGNAL PIN SIGNAL
1 DCDA 6 DSRA
2 RXDA 7 RTSA
3 TXDA 8 CTSA
4 DTRA 9 RIA
5 GND
3.6 EXTERNAL SERIAL PORT HEADER（COM2~COM6）
The following table describes the pin out assignments of this connector.
PIN SIGNAL PIN SIGNAL
1 DCDB 6 DSRB
2 RXDB 7 RTSB
3 TXDB 8 CTSB
4 DTRB 9 RIB
1
10 2
9
COM 2
5 GND 10 GND
PIN SIGNAL PIN SIGNAL
1 DCDC 2 DSRC
3 RXDC 4 RTSC
5 TXDC 6 CTSC
7 DTRC 8 RIC
9 GND 10 N.C.
11 DCDD 12 DSRD
13 RXDD 14 RTSD
15 TXDD 16 CTSD
17 DTRD 18 RID
1 19
2 20
COM3, COM4
19 GND 10 N.C.

PIN SIGNAL PIN SIGNAL
1 DCDE 2 DSRE
3 RXDE 4 RTSE
5 TXDE 6 CTSE
7 DTRE 8 RIE
9 GND 10 N.C.
11 DCDF 12 DSRF
13 RXDF 14 RTSF
15 TXDF 16 CTSF
17 DTRF 18 RIF
1 19
2 20
COM5, COM6
19 GND 20 N.C.
3.7 VGA CONNECTOR （VGA1）
Monitor can be connected to VGAport.
VGA1
PIN SIGNAL PIN SIGNAL
1 RED 9 +5V
2 GREEN 10 GND
3 BLUE 11 N.C.
4 N.C. 12 SDA
5 GND 13 HSYNC
6 GND 14 VSYNC
7 GND 15 SCL
8 GND
3.8 RJ- 45 & USB CONNECTOR（CN2）
The provided Internet connection is fast Ethernet, providing data transfer speeds of 10/100Mbps. Plug
the Ethernet to the upper port and USB devices to the lower port.
PIN SIGNAL PIN SIGNAL
1 TX+ 9 +5V
2 TX- 10 USB0-
3 RX+ 11 USB0+
4 N.C. 12 GND
5 N.C. 13 +5V
6 RX- 14 USB1-
7 N.C. 15 USB1+
18
13 14 15 16
9 10 11 12
CN2
8 N.C. 16 GND

3.9 DVI-D CONNECTOR（CN1）
Monitor can be connected to DVI-D port.
8
2417
1
CN1
PIN SIGNAL PIN SIGNAL
1 TMDS_TX2N 2 TMDS_TX2P
3 GND 4 N.C.
5 N.C. 6 TMDS_CLK
7 TMDS_DATA 8 VSYNC
9 TMDS_TX1N 10 TMDS_TX1P
11 GND 12 N.C.
13 N.C. 14 +5V
15 GND 16 TMDS_HPD
17 TMDS_TX0N 18 TMDS_TX0P
19 GND 20 N.C.
21 N.C. 22 GND
23 TMDS_TXCP 24 TMDS_TXCN
3.10 AUDIO LINE OUT⁄LINE IN⁄MIC HEADER（J4）
Include Line out, Line in, and MIC. Devices like CD-ROM, walkman etc. can be connected to line in.
Connect the speaker, earphone to line out. Microphone can be connected to MIC.
PIN SIGNAL PIN SIGNAL
1 R_OUT 2 L_OUT
3 GND 4 GND
5 R_IN 6 L_IN
7 GND 8 GND
9 N.C. 10 MIC_IN
1 11
2 12
J4 11 GND 12 +12V
3.11 CD IN HEADER（J6）
Connect CD-ROM or DVD-ROM audio out to the connector.
PIN SIGNAL PIN SIGNAL
1 CD_L 3 GND
14
J6
2 GND 4 CD_R

3.12 HARD DISK（IDE）CONNECTOR (IDE1, IDE2)
An IDE device connects to the computer via an IDE connector. One IDE connector can connect to one
IDE cable, and the single IDE cable can then connect to two IDE devices (hard drive or optical drive). If
you wish to connect two IDE devices, please set the jumper on one IDE device as Master and the other
as Slave.
1 39
2 40
IDE1 ：Primary IDE Channel
PIN SIGNAL PIN SIGNAL
1 IDERST 2 GND
3 PDATA7 4 PDATA8
5 PDATA6 6 PDATA9
7 PDATA5 8 PDATA10
9 PDATA4 10 PDATA11
11 PDATA3 12 PDATA12
13 PDATA2 14 PDATA13
15 PDATA1 16 PDATA14
17 PDATA0 18 PDATA15
19 GND 20 N.C.
21 PDDREQ 22 GND
23 PDDIOW 24 GND
25 PDDIOR 26 GND
27 PIORDY 28 GND
29 PDDACK 30 GND
31 IRQ14 32 N.C.
33 PDA1 34 P66DET
35 PDA0 36 PDA2
37 PDCS1 38 PDCS3
39 HDDLED 40 GND

1 43
2 44
IDE2 ：Secondary IDE Channel
PIN SIGNAL PIN SIGNAL
1 IDERST 2 GND
3 SDATA7 4 SDATA8
5 SDATA6 6 SDATA9
7 SDATA5 8 SDATA10
9 SDATA4 10 SDATA11
11 SDATA3 12 SDATA12
13 SDATA2 14 SDATA13
15 SDATA1 16 SDATA14
17 SDATA0 18 SDATA15
19 GND 20 N.C.
21 SDDREQ 22 GND
23 SDDIOW 24 GND
25 SDDIOR 26 GND
27 SIORDY 28 GND
29 SDDACK 30 GND
31 IRQ15 32 N.C.
33 SDA1 34 S66DET
35 SDA0 36 SDA2
37 SDCS1 38 SDCS3
39 HDDLED 40 GND
41 +5V 42 +5V
43 GND 44 N.C.

3.13 COMPACT FLASH CONNECTOR（CFB1）
50 1
CFB1 ：Secondary IDE Channel
PIN SIGNAL PIN SIGNAL
1 GND 2 SDATA3
3 SDATA4 4 SDATA5
5 SDATA6 6 SDATA7
7 SDCS1 8 GND
9 GND 10 GND
11 GND 12 GND
13 +5V 14 GND
15 GND 16 GND
17 GND 18 SDA2
19 SDA1 20 SDA0
21 SDATA0 22 SDATA1
23 SDATA2 24 GND
25 GND 26 GND
27 SDATA11 28 SDATA12
29 SDATA13 30 SDATA14
31 SDATA15 32 SDCS3
33 GND 34 SDDIOR
35 SDDIOW 36 +5V
37 IRQ15 38 +5V
39 M/S SELECT 40 N.C.
41 IDERST 42 SIORDY
43 N.C. 44 +5V
45 HDDLED 46 N.C.
47 SDATA8 48 SDATA9
49 SDATA10 50 GND
※Compact Flash (CFB1) and IDE 2 share the same channel. Since a Compact Flash card is installed in
the socket, the IDE 2 device will become unusable. CF card & IDE2 device cannot use at the same time.

3.14 COMPACT FLASH CONNECTOR MASTER⁄SLAVE SELECT HEADER（JP3）
Set the jumper on one compact flash device as Master and the other as Slave.
PIN SIGNAL
1-2 ON MASTER MODE
1
JP3 1-2 OFF SLAVE MODE
（Factory Preset）
3.15 CPU CLOCK SELECT HEADER（JCLK1）
PIN SIGNAL
1-2 ON 133 MHZ
1
JCLK1 2-3 ON 100 MHZ
（Factory Preset）
3.16 INTERNAL BUZZER（BZ1）
PIN SIGNAL
1 +5V
BZ1 2 SPEAK
3.17 CPU FAN POWER CONNECTOR（FAN1, FAN2, FAN3）
FAN1, FAN2, FAN3 is a three pin header for system fans. These fans power supplies +12V power voltage.
PIN SIGNAL
1 GND
2 +12V
1
FAN1, FAN2, FAN3 3 SENSE