Flytech B78 Hardware Service Guide

K875

Hardware Service Guide

2006 November V1.1

Table of Contents

Chapter 1: Product Overview .............................................................................................4

Chapter 2: Power-On Self-Test (POST) Errors.....................................................................5

Chapter 3 : Troubleshooting.............................................................................................11

Chapter 4 : Hardware Service..........................................................................................17

Introduction ............................................................................................................17

Safety requirements................................................................................................17

Fuse Replacement..........................................................................................17

Lithium Battery Warning...................................................................................17

IT Power System.............................................................................................17

Peripheral Usage............................................................................................17

Grounding instructions .....................................................................................18

Tools Used.............................................................................................................18

Back Cable Connectors...........................................................................................19

Terminal Disassembly Procedure..............................................................................19

Removing the HDD.................................................................................................19

Removing the Motherboard Tray..............................................................................21

Removing the CPU .................................................................................................22

Removing the EMI Cover.........................................................................................24

Removing the Inverter Board....................................................................................27

Removing the Touch Board......................................................................................27

Removing the Speakers...........................................................................................28

Removing the Docking Board...................................................................................29

Removing the LED Sensor Board.............................................................................30

Removing the MSR Board .......................................................................................31

Removing the LCD Panel and Touchscreen...............................................................32

Circuit Boards.........................................................................................................35

Main Board.....................................................................................................35

Jumper Settings..............................................................................................36

Chapter 5 : Connector Pin-Out Identification......................................................................39

Introduction ............................................................................................................39

Speaker & MIC Connector (CN4)..............................................................................39

CD-IN Connector (CN9)...........................................................................................39

Power Connector For 3.5” HDD (CN11).....................................................................39

COM 5 (CN13)........................................................................................................40

CPU FAN Connector (CN15)....................................................................................40

USB 2 (CN18).........................................................................................................40

2

LVDS Interface (CN19)............................................................................................41

Inverter Connector (CN20).......................................................................................42

POS Card Reader Connector (CN21) .......................................................................42

System FAN Connector (CN22)................................................................................43

IrDA Connector (CN23)............................................................................................43

COM 1, COM 2 , COM 3, COM 4 (RJ45_2)...............................................................43

Appendix A: IRQ Assignments....................................................................................44

3

Chapter 1: Product Overview

The K875 is a new milestone in Panel PC. Its ultra compact design and sleek appearance
create a breakthrough image. Innovate tool-free serviceability allows you to change main
board and HDD in minutes. The K875 uses Intel Mobile technology supporting a variety of
CPU demands. It also combines advanced SAW touch technology providing reliable and
durable touch interface. 15” display, motion sensor, WLAN, IrDA, rich I/O ports and optional
MSR and scanner offer a flexible and multi-functional platform. Rugged retail-hardened
design, NEMA 3 / IP 55 dust and water resistant display front fit it into severe in-store
environments. With multiple mounting options, the K875 can be installed in wide range
applications like retail, healthcare, transportation, travel / tourism, signage, government,
banking, entertainment and other fields. K875 is everywhere. It surpasses your expectation.

4

Chapter 2: Power-On Self-Test (POST) Errors

During the power on self test (POST), if the BIOS detects an error requiring you to do
something, it will either sound a beep code or display a message. If a message is displayed, it
will be accompanied by the following:

PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER SETUP

Currently there is only one beep code in the BIOS. A single long beep followed by two short
beeps indicates that a video error has occurred and the BIOS cannot initialize the video screen
to display any additional information.

One or more of the following messages may be displayed if the BIOS detects an error during
the POST.

Error Message Corrective Action

BIOS ROM checksum error-System halted The checksum of the BIOS code in the BIOS

chip is incorrect, indicating the BIOS code
may have become corrupt. Replace the BIOS.

CMOS battery failed CMOS battery is no longer functional.

Replace battery.

CMOS checksum error Defaults loaded Checksum of CMOS is incorrect, so the

system loads the default equipment
configuration. A checksum error may indicate
that CMOS has become corrupt. This error
might have been caused by a weak battery.

Check the battery and replace if necessary.
CMOS Checksum Error Dick Boot Failure,
Insert System Disk and press [ENTER]

Checksum of CMOS is incorrect. This can

indicate that CMOS has become corrupt. This

error may have been caused by a weak

battery. Check the battery and replace if

necessary.
CPU at nnnn Displays the running speed of the CPU.

5

Error Message Corrective Action

Diskette Drivers or Types Mismatch
Error-Run Setup

Display switch is set incorrectly. The display switch on the motherboard can be

Display Type has changed Since Last Boot
Changed.

EISA Configuration Checksum Error The EISA nonvolatile RAM checksum is

Type of diskette drive installed in the system

is different from the CMOS definition. Run

Setup to reconfigure the drive type correctly.

set to either monochrome or color. This

message indicates the switch is set to a

different setting than indicated in Setup.

Determine which setting is correct, and then

either turn off the system and change the

jumper; or, enter Setup and change the

VIDEO selection.

Since last powering off the system, the

display adapter has been changed. You must

configure the system for the new display type.

incorrect or cannot correctly read the EISA

slot. This can indicate either the EISA

nonvolatile memory has become corrupt or

the slot has been configured incorrectly. Also

be sure the card is installed firmly in the slot.
EISA Configuration Is Not Complete The slot configuration information stored in

the EISA nonvolatile memory is incomplete.
Error Encountered Initializing Hard Drive Hard drive cannot be initialized. Be sure the

adapter is installed correctly and all cables are

correctly and firmly attached. Also be sure the

correct hard drive type is selected in Setup.
Error Initializing Hard Disk Controller Cannot initialize controller. Make sure the

cord is correctly and firmly installed in the

bus. Be sure the correct hard drive type is

selected in Setup. Also check to see if any

jumper needs to be set correctly on the hard

drive.

6

Error Message Corrective Action

Floppy Disk CNTRLR Error or No
CNTRLR Present

Floppy disk(s) fail Cannot find or initialize the floppy drive

Hard Disk Initializing Hard Disk Install
Failure

Hard Disk(s) diagnosis fail The system may run specific disk diagnostic

Cannot find or initialize the floppy drive

controller. Make sure the controller is

installed correctly and firmly. If there are no

floppy drives installed, be sure the Diskette

Drive selection in Setup is set to NONE.

controller or the drive. Make sure the

controller is installed correctly. If no floppy

drives are installed, be sure the Diskette Drive

selection in Setup is set to NONE or AUTO.

Cannot find or initialize the hard drive

controller or the drive. Make sure the

controller is installed correctly. If no hard

drives are installed, be sure the Hard Drive

selection in Setup is set to NONE.

routines. This message appears if one or more

hard disks return an error when the

diagnostics run.
Invalid EISA Configuration The nonvolatile memory containing EISA

configuration information was programmed

incorrectly or has become corrupt. Return

EISA configuration utility to correctly

program the memory.
Keyboard error or no keyboard present Cannot initialize the keyboard. Make sure the

keyboard is attached correctly and no keys are

being pressed during the boot. If you are

purposely configuring the system without a

keyboard, set the error halt condition in Setup

to HALT ON ALL, BUT KEYBOARD. This

will cause the BIOS to ignore the missing

keyboard and continue the boot.

7

Error Message Corrective Action

Keyboard is locked out unlock the key This message usually indicates that one or

more keys have been pressed during the

keyboard tests. Be sure no objects are resting

on the keyboard.
Memory Address Error at… Indicates a memory address error at a specific

location. You can use this locating along with

the memory map for your system to find and

replace the bad memory chips.
Memory parity Error at… Indicates a memory address error at a specific

location. You can use this locating along with

the memory map for your system to find and

replace the bad memory chips.
Memory Size has Changed Since Last Boot Memory has been added or removed since the

last boot. In EISA mode, use configuration

utility to reconfigure the memory

configuration. In ISA mode, enter Setup and

enter the new memory size in the memory

fields.
Memory Test This message displays during a full memory

test, counting down the memory areas being

tested.
Memory test fail: If POST detects an error during memory

testing, additional information appears giving

specifics about the type and location of the

memory error.
Memory Verify Error at… Indicates an error verifying a value already

written to memory. Use the location along

with your system’s memory map to locate the

bad chip.

8

Error Message Corrective Action

No boot device was found This could mean that either a boot drive was

not detected or the drive does not contain

proper system boot files. Insert a system disk

into drive A: and press Enter. If you assumed

the system would boot from the hard drive,

make sure the controller is inserted correctly

and all cables are properly attached. Also be

sure the disk is formatted as a boot device.

Then reboot the system.
Offending Address Not Found This message is used in conjunction with the

I/O CHANNEL CHECK and RAM PARITY

ERROR messages when the segment that has

caused the problem cannot be isolated.
Offending Segment: This message is used in conjunction with the

I/O CHANNEL CHECK and RAM PARITY

ERROR messages when the segment that has

caused the problem cannot be isolated.
Override enabled defaults loaded If the system cannot boot using the current

CMOS configuration, the BIOS can override

the current configuration with a set of BIOS

defaults designed for the most stable,

minimal-performance system operations.
Press a Key to Reboot This will be displayed at the bottom of the

screen when an error occurs that requires you

to reboot. Press any key to reboot the system.
Press ESC to skip memory test You can press ESC to skip the full memory

test.
Press [F1] to Disable NMI, [F2] to Reboot When BIOS detects a non-maskable interrupt

condition during boot, this will allow you to

disable the NMI and continue to boot; or you

can reboot the system with the NMI enabled.

9

Error Message Corrective Action

Press TAB to show POST screen System OEMs may replace the Award BIOS

POST display with their own proprietary

display. Including this message in the OEM

display permits the operator to switch

between the OEM display and the default

POST display.
Primary master hard disk fail POST detects an error in the primary master

IDE hard drive.
Primary slave hard disk fail POST detects an error in the secondary

master IDE hard drive.
RAM Parity Error Checking for Segment Indicates a parity error in RAM.
Resuming from disk, Press TAB to show
POST screen

Secondary master hard disk fail POST detects an error in the primary slave

Secondary slave hard disk fail POST detects an error in the secondary slave

Should Be Empty But EISA Board Found A valid board ID was found in a slot that was

Should HAVE EISA Board But Not Found The board installed is not responding to the

Slot Not Empty Indicates that a slot designated as empty by

Award offers a save-to-disk feature for

notebook computers. This message may

appear when the operator restarts the system

after a save-to-disk / shutdown. See the Press

Tab … message earlier for a description of

this feature.

IDE hard drive.

IDE hard drive.

configured as having no board ID.

ID request, or no board ID had been found in

the indicated slot.

the EISA configuration utility actually

contains a board.
System Halted, [CTRL-ALT-DEL] to
reboot…

Wrong Board In Slot The board ID does not match the ID stored in

Indicates the present boot attempt has been

aborted and the system must be rebooted.

Press and hold down the Ctrl and Alt keys

and press Del.

the EISA nonvolatile memory.

10

Chapter 3 : Troubleshooting

11

Power Circuit Troubleshooting

12

LCD Panel Troubleshooting

13

Peripheral Troubleshooting

14

Other Function T roubleshooting

15

Touch Screen Troubleshooting

16

Chapter 4 : Hardware Service

Introduction

This chapter discusses procedures for disassembling the K875 hardware for servicing.
Topics include:

• Safety requirements

• Tools used

• Back Panel Cable connectors

• Disassembly procedures

• Board strapping information

Safety requirements

Caution: This product does not contain user serviceable parts. Servicing should only be
performed by a qualified service technician.

Fuse Replacement

Caution: For continued protection against risk of fire, replace only with the same type and
ratings of fuse.

Lithium Battery Warning

Caution: Danger of explosion if battery is incorrectly replaced. Replace only with the same
or equivalent type as recommended by the manufacturer. Discard used batteries according to
the manufacturer’s instructions.

IT Power System

This product is suitable for connection to an IT power system with a phase-to-phase voltage
not exceeding 240V.

Peripheral Usage

This terminal should only be used with peripheral devices that are certified the appropriate
safety agency for the country of installation (UL, CSA, TUV, VDE).

17

Caution: DO NOT connect or disconnect a printer, keyboard, or any other terminal-powered
peripheral while the terminal is powered on. Doing so may result in peripheral or system
damage.

Grounding instructions

In the event of a malfunction or breakdown, grounding provides a path of least resistance for
electric current to reduce the risk of electric shock. This product is equipped with an electric
cord having an equipment-grounding conductor and a grounding plug. The plug must be
plugged into a matching outlet that is properly installed and grounded in accordance with all
local codes and ordinances. Do not modify the plug provided – if it will not fit the outlet, have
the proper outlet installed by a qualified electrician. Improper connection of the equipment –
grounding conductor can result in a risk of electric shock. The conductor with insulation
having an outer surface that is green with or without yellow stripes is the equipment –
grounding conductor. If repair or replacement of the electric cord or plug is necessary, do not
connect the equipment – grounding conductor to a live terminal. Check with a qualified
electrician or service personnel if the grounding instructions are not completely understood,
or if you are in doubt as to whether the product is properly grounded.
Use only 3-wire extension cords that have 3-prong grounding plugs and 3-pole receptacles
that accept the product’s plug. Repair or replace damaged or worn cords immediately.

Tools Used

The tools used for servicing are the following:

z 3.5mm Precision Screwdriver – This is used for all flat-head screws.
z 3/16 Hex Screwdriver – This is used for all hex-screws located at the back of the

terminal.

z #1 and #2 Philips Screwdrivers – It is highly recommended to use screwdrivers that are

magnetized at one end in order to handle the screws easily.

z 4IN Slot Screwdrivers – This is used for the slot screws.

18

)

Back Cable Connectors

The peripherals connect to the Back Connectors.

Line-In Line-Out

USB (2) LPT LAN

DC Jack

Cash Drawer

COM (4) USB (2)

Terminal Disassembly Procedure

This section explains how to disassemble the

Warning: Disconnect the AC power cord before disassembling the Ter

Removing the HDD

1. Remove the screw (1).

K875 for service purposes.

minal.

Screw (1

19

2. Remove the HDD door.

. Remove the HDD by pulling on the tag. 3

. Disconnect the HDD cable (1). 4

HDD cable (1)

20

Removing the Motherboard Tray

e cable cover. 1. Loosen the thumbscrews (2) to remove th

Thumbscrew (1)

. Loosen the thumbscrews (2). 2

Thumbscrew (1)

Thumbscrew (1)

Thumbscrew (1)

. Remove the Motherboard tray by pulling on the handle. 3

21

)

4. Remove the Motherboard tray.

Removing the CPU

1. Disconnect the fan cable

(1).

Fan Cable (1

22

2. Remove the screws (4).

Screws (2)

Screws (2)

. Lift the heatsink and fan up.

3

. Turn the knob 180 degrees to open the key lock to remove the CPU by a slot screwdriver 4

23

Key Lock

Removing the EMI Cover

1. Remove the HDD.

2. Remove the motherboard tray.

3. Remove the screws (3).

Screws (3)

4. Slide the MSR cover out and disconnect the cable (1).

Cable (1)

5. Remove the screw (1).

Screw (1)

24

6. Remove the screw (1).

7. Open the button cover and remove the screw (1).

Screw (1)

Screw (1)

8. Separate the rear bezel and front bezel.

25

)

9. Remove the screws (6).

10. Remove the screws (4).

Screws (2)

Screws (2

Screw (1)

Screws (3)

Screws (2)

11. Lift the EMI cover up.

26

Removing the Inverter Board

1. Remove the HDD.

2. Remove the motherboard tray.

3. Remove the EMI cover.

4. Disconnect the cables (3).

Cable (1)

5. Remove the screws (2).

Screw (1)

Cable (1)

Cable (1)

Screw (1)

Removing the Touch B

1. Remove the HDD.

2. Remove the motherboard tray.

3. Remove the EMI cover.

oard

27

4. Disconnect the cables (2).

Cable (1)

5. Remove the screws (2).

Touch Cable (1)

Screw (1)

Removing the Speakers

1. Remove the HDD.

2. Remove the motherboard tray.

3. Remove the EMI cover.

Screw (1)

28

4. Disconnect the speaker cable (1).

Cable (1)

5. Remove the screws (4).

Screws (2)

Removing the Docking Board

1. Remove the HDD.

2. Remove the motherboard tray.

3. EMI cover.

Remove the

Screws (2)

29

4. Disconnect the cables (7).

5. Remove the screws (3) to replace the docking board.

Screw (1)

Removing the LED Sensor Board

1. Remove the HDD.

2. Remove the motherboard tray.

3. Remove the EMI cover.

Screws (2)

30

)

4. Disconnect the cables (2).

LED Interface (1)

5. Lift the LED sensor board up.

IrDA Cable (1

Removing the MSR Board

1. Remove the HDD.

2. Remove the motherboard tray.

3. Remove the EMI cover.

4. Disconnect the cable (1) (see the picture below).

31

5. Remove the screws (2).

Cable (1)

Screws (2)

Removing the LCD Panel and Touchscreen

1. Remove the HDD.

2. Remove the motherboard tray.
. Remove the EMI cover.

3

. Remove the MSR board.

4

. Remove the LED sensor board.

5

. Disconnect the cables (2).

6

Touch Cable (1)

LCD Cable (1)

32

7. Remove the screws (2).

Screw (1)

Screw (1)

8. Remove the screws (2) that secure the LCD bracket to the display front bezel.

Screw (1)

Screw (1)

33

9. Remove the screws (12) and remove the brackets (4).

Screws (3)

Screws (3)

Screws (3)

10. Remove the screws (2).

Screw (1)

Screws (3)

Screw (1)

34

J

11. Remove the screws (2) to remove the LCD panel.

Screw (1)

Circuit Boards
Main Board

JP11

CN18

CN21

JP7

CN20

CN19

CN13

Screw (1)

CN15

CPU1

PWR1

RJ45 1

P4

RJ11_1

PCI1

JP6

IDE1

JP9

RJ45 2

JP10

JP3

35

JP2

JP1

JP5

DIMM1

USB2 USB1

PRN1

SW1

Jumper Settings

The diagram bel
indicates the def

ow illustrates the default jumper settings for the Main Board. An asterisk (*)
ault setting.

MOS Operation (JP8) Instruction:

C

1. Turn off the power.

2. Set the jumper from CMOS Normal (*1-2) to CMOS Reset (2-3).

3. Finally, res

CMOS Operation Mode

Function JP8

CMOS Normal

CMOS Reset 1-2

Power Mode Setting

Function JP6

ATX Power

et the jumper from CMOS Reset (2-3) to CMOS Normal (*1-2).

◎N/C

◎N/C

AT Power 1-2

Cash Drawer Power Setting

Vo e ltag JP4

+12V

Not available 3-4

+24V 5-6

Card Reader Setting

Function
JP11 (1-2) N/C 1-2
JP11 (3-4) N/C 3-4

◎Ducking

JP2

◎1-2

On Board

36

LCD ID Setting

Resolution

Number

0 640 x 480

1 800 x 600

2

3 4

4 1024 x 768

5 800

COM3 – g 4 Power Settin

Function JP3
COM3 PIN10_RI
COM3 PIN10_+5V 3-4

LVDS JP7 Panel

Bits Channel 1-2 3-4 5-6 7-8

18 Single

18 Single

18 Single

24 Dual

24 Single

24 Single

SHORT SHORT SHORT SHORT

SHORT SHORT SHORT OPEN

SHORT SHORT OPEN OPEN 1280 x 102

SHORT OPEN SHORT SHORT

SHORT OPEN SHORT OPEN x 600

◎1-2

SHORT OPEN SHORT 1024 x 768 SHORT

COM3 PIN10_+12V 5-6
COM4 PIN10_RI
COM4 PIN10_+5V 9-10
COM4 PIN10_+12V 11-12

◎7-8

37

CO RS2 22 Setting M2 32 / 485 / 4

Function
JP9 (1-2) V
JP9 (3-4) V
JP9 (4-6) V
JP9 (5-7) V
JP9 (7-8) V
JP9 (9-10) V
JP10 (1-2) V
JP10 (3-4) V
JP10 (5-6) V
JP10 (7-8) V
JP10 (9-10) V
JP10 (11-12) V

◎RS232

RS485 RS422

Replacing the Lithium Battery

aution: Danger of explosion if battery is incorrectly replaced.

C

eplace only with the same or equivalent type as recommended by the manufacturer.

R

iscard used batteries according to the manufacturer’s instructions.

D

Note the battery’s polarity before removing it so that you can replace the battery correctly.

1

Press the Retaining Clip to one side and pull the battery out of the socket.

2

Insert the new battery by pushing it straight down until it is tightly locked.

3

ote: Run Setup and set the defaults. Set the Date/Time and make any desired special

N

ettings.

s

Lith y ium Batter

38

Chapter 5 : Connector Pin-Out Identification

Introduction

his chapter describes the Pin Configuration of all the connectors found on the mainboard

T

Speaker & MIC Connector (CN4)

PIN No. Signal Description

1 AMP_ORL
2 GND
3 GND
4 AMP_ORR
5 GND
6 MIC1

CD-IN Connector (CN9)

PIN No. Signal Description

1 CDIN_L
2 CDIN_REF
3 CDIN_R
4 CDIN_REF

Power Connector For 3.5” HDD (CN11)

PIN No. Signal Description

1 +12V
2 GND
3 GND
4 +5V

39

COM 5 (CN13)

PIN No. Signal Description

1 DCD#
2 RX#
3 TX#
4 DTR#
5 GND
6 DSR#
7 RTS#
8 CTS#
9 RI

10 +5V

CPU FAN Connector (CN15)

PIN No. Signal Description

1 +5V
2 Feedback
3 GND

SB 2 (CN18)

U

PIN No. Signal Description

1 +5V_USB1
2 USB20_R_P1
3 USB20_R_P1+
4 GND

40

LVDS Interface (CN19)

PIN No. Signal Description PIN No. Signal Description

1 LVDS_B0+ 21 LVDS_B3­2 LVDS_A3+ 22 LVDS_A1­3 LVDS_B0- 23 GND
4 LVDS_A3- 24 GND
5 GND 25 LVDS_CLKB+
6 GND 26 LVDS_A0+
7 LV 27 LVDS_CLKB- DS_B1+
8 LVDS_CLKA+ 28 LVDS_A0-

9 LVDS_B1- 29 GND
10 30 GND LVDS_CLKA­11 GND 31 +5V_LCDVDD
12 GND 32 +3.3V_LCDVDD
13 LVDS_B2+ 33 +5V_LCDVDD
14 LVDS_A2+ 34 +3.3V_LCDVDD
15 LVDS_B2- 35 +5V_LCDVDD
16 LVDS_A2- 36 +3.3V_LCDVDD
17 GND 37 +5V_LCDVDD
18 GND 38 +3.3V_LCDVDD
19 LVDS_B3+ 39 +5V_LCDVDD
20 LVDS_A1+ 40 +3.3V_LCDVDD

41

Inverter Connector (CN20)

PIN No. Signal Description

1 +12V_INV
2 +12V_INV
3 +12V_INV
4 +12V_INV
5 B ight Enable ack-L
6 N/C
7 N/C
8 B e ack-Light Enabl
9 GND

10 GND
11 GND
12 GND

POS Card Reader Connector (CN21)

PIN No. Signal Description

1 +5V
2 +5V
3 K TO_MSR DATA_SIO_
4 KDATA_SIO_TO_MSR
5 KDATA_MSR_TO_GFINGER
6 KCLK_MSR_TO_GHINGER
7 RS232_6_RX#
8 RS232_6_TX#
9 RS232_6_CTS#

10 RS232_6_RTS#
11 KB_EN
12 GND
13 USB20_MSR_P0+
14 USB20_MSR_P0­15 GND

42

System FAN Connector (CN22)

PIN No. Signal Description

1 +5V
2 Feedback
3 GND

IrDA onne

C ctor (CN23)

PIN No. Signal Description

1 +5V
2 IRDA_RX
3 IRDA_TX
4 GND

COM 1, COM 2 , COM 3, COM 4 (RJ45_2)

PIN No. Signal Description PIN No. Signal Description

1 N/C 21 N/C

2 RS232_1_DCD# 22 RS232_3_DCD#

3 RS232_1_DSR# 23 RS232_3_DSR#

4 RS232_1_RX# 24 RS232_3_RX#

5 RS232_1_RTS# 25 RS232_3_RTS#

6 RS232_1_TX# 26 RS232_3_TX#

7 RS232_1_CTS# 27 RS232_3_CTS#

8 RS232_1_DTR# 28 RS232_3_DTR#

9 GND 29 GND
10 30 RS232_3_RI RS232_1_RI
11 N/C 31 N/C
12 RS232_2_DCD# 32 RS232_4_DCD#
13 RS232_2_DSR# 33 RS232_4_DSR#
14 RS232_2_RX# 34 RS232_4_RX#
15 RS232_2_RTS# 35 RS232_4_RTS#
16 RS232_2_TX# 36 RS232_4_TX#
17 RS232_2_CTS# 37 RS232_4_CTS#
18 RS232_2_DTR# 38 RS232_4_DTR#
19 GND 39 GND
20 RS232_2_RI 40 RS232_4_RI

43

Appendix A: IRQ Assignments

IRQ Priority Default Function

0 1 System Timer
1 2 Keyboard Controller
2 N/A Programmable Interrupt
3 11 Communication Port (COM2 / IrDA)
4 12 Communication Port (COM1)
5 13

PCI devices

6 14

PCI devices

7 15

Parallel port (LPT1)
8 3 System CMOS / Real Time Clock
9 4

10 5
11 6
12

7

ACPI Controller / PCI devices

Communic (COM3 ) ation Port /COM4/COM5/COM6

PCI devices

PS/2 mouse CI de

or P vices

(Auto free IRQ12 for PCI devices if PS/2

mouse not e when n.)

xist system power o

13 Numeric Da Proce8 ta ssor
14 Primary IDE hanne9 C l #1
15 Secondary Cha10 IDE nnel #2

44