Intel BLKD425KT Configuration guide

Intel® Desktop Board D425KT and
Intel® Desktop Board D425KTW
Technical Product Specification
July 2010
Order Number: E98415-001US
The Intel®Desktop Board D425KT and Intel®Desktop Board D425KTW may contain design defects or errors known as errata that may cause the product to
deviate from published specifications. Current characterized errata are documented in the Intel Desktop Board D425KT and Intel Desktop Board D425KTW
Specification Update.

Revision History
Revision Revision History Date
-001 First release of the Intel®Desktop Board D425KT and Intel®Desktop
Board D425KTW Technical Product Specification.
July 2010
This product specification applies to only the standard Intel®Desktop Board D425KT and Intel®
Desktop Board D425KTW with BIOS identifier MWPNT10N.86A
Changes to this specification will be published in the Intel Desktop Board D425KT and Intel
Desktop Board D425KTW Specification Update before being incorporated into a revision of this
document.
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to deviate from published specifications. Current characterized errata are available on request.
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Copyright © 2010, Intel Corporation. All rights reserved.

iii
Preface
This Technical Product Specification (TPS) specifies the board layout, components,
connectors, power and environmental requirements, and the BIOS for the Intel®
Desktop Board D425KT and Intel®Desktop Board D425KTW. It describes the
standard product and available manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Intel Desktop
Board D425KT and Intel Desktop Board D425KTW and its components to the vendors,
system integrators, and other engineers and technicians who need this level of
information. It is specifically not intended for general audiences.
What This Document Contains
Chapter Description
1 A description of the hardware used on the board
2 A map of the resources of the board
3 The features supported by the BIOS Setup program
4 A description of the BIOS error messages, beep codes, and POST codes
5 Regulatory compliance and battery disposal information
Typographical Conventions
This section contains information about the conventions used in this specification. Not
all of these symbols and abbreviations appear in all specifications of this type.
Notes, Cautions, and Warnings
NOTE
Notes call attention to important information.
CAUTION
Cautions are included to help you avoid damaging hardware or losing data.

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
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Other Common Notation
# Used after a signal name to identify an active-low signal (such as USBP0#)
GB Gigabyte (1,073,741,824 bytes)
GB/s Gigabytes per second
Gbit Gigabit (1,073,741,824 bits)
KB Kilobyte (1024 bytes)
Kbit Kilobit (1024 bits)
kbits/s 1000 bits per second
MB Megabyte (1,048,576 bytes)
MB/s Megabytes per second
Mbit Megabit (1,048,576 bits)
Mbit/s Megabits per second
xxh An address or data value ending with a lowercase h indicates a hexadecimal value.
x.x V Volts. Voltages are DC unless otherwise specified.
* This symbol is used to indicate third-party brands and names that are the property of their
respective owners.

v
Contents
1Product Description .............................................................. 9
1.1 Overview.......................................................................................... 9
1.1.1 Feature Summary .................................................................. 9
1.1.2 Board Layout ....................................................................... 11
1.1.3 Block Diagram ..................................................................... 13
1.2 Online Support................................................................................ 14
1.3 Processor ....................................................................................... 14
1.3.1 Intel D425 Graphics Subsystem.............................................. 15
1.4 System Memory .............................................................................. 16
1.5 Intel®NM10 Express Chipset............................................................. 17
1.5.2 USB ................................................................................... 19
1.5.3 SATA Support ...................................................................... 19
1.6 Real-Time Clock Subsystem .............................................................. 20
1.7 Legacy I/O Controller....................................................................... 20
1.8 LAN Subsystem............................................................................... 21
1.8.1 LAN Subsystem Drivers......................................................... 21
1.8.2 RJ-45 LAN Connector with Integrated LEDs .............................. 22
1.9 Audio Subsystem............................................................................. 23
1.9.1 Audio Subsystem Software .................................................... 24
1.9.2 Audio Connectors and Headers ............................................... 24
1.10 Hardware Management Subsystem .................................................... 25
1.10.1 Hardware Monitoring............................................................. 25
1.10.2 Thermal Monitoring .............................................................. 26
1.11 Power Management ......................................................................... 27
1.11.1 ACPI................................................................................... 27
1.11.2 Hardware Support ................................................................ 30
2Technical Reference............................................................ 33
2.1 Memory Map................................................................................... 33
2.1.1 Addressable Memory............................................................. 33
2.2 Connectors and Headers................................................................... 36
2.2.1 Back Panel .......................................................................... 37
2.2.2 Component-side Connectors and Headers ................................ 39
2.3 BIOS Configuration Jumper Block....................................................... 49
2.4 Mechanical Considerations ................................................................ 51
2.4.1 Form Factor......................................................................... 51
2.5 Electrical Considerations................................................................... 52
2.5.1 Fan Header Current Capability................................................ 52
2.5.2 Add-in Board Considerations .................................................. 52
2.6 Thermal Considerations.................................................................... 52
2.6.1 Passive Heatsink Design in a Passive System Environment ......... 54

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
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2.7 Power Consumption ......................................................................... 57
2.7.1 Minimum Load Configuration.................................................. 57
2.7.2 Maximum Load Configuration ................................................. 57
2.8 Reliability ....................................................................................... 58
2.9 Environmental ................................................................................ 59
3Overview of BIOS Features ................................................. 61
3.1 Introduction ................................................................................... 61
3.2 BIOS Flash Memory Organization....................................................... 62
3.3 Resource Configuration .................................................................... 62
3.3.1 PCI* Autoconfiguration.......................................................... 62
3.4 System Management BIOS (SMBIOS)................................................. 63
3.5 Legacy USB Support ........................................................................ 64
3.6 BIOS Updates ................................................................................. 65
3.6.1 BIOS Recovery..................................................................... 65
3.6.2 Custom Splash Screen .......................................................... 66
3.7 Boot Options................................................................................... 66
3.7.1 Optical Drive Boot ................................................................ 66
3.7.2 Network Boot....................................................................... 66
3.7.3 Booting Without Attached Devices........................................... 67
3.7.4 Changing the Default Boot Device During POST ........................ 67
3.8 BIOS Security Features .................................................................... 68
4Board Status and Error Messages ....................................... 69
4.1 BIOS Beep Codes ............................................................................ 69
4.2 Front-panel Power LED Blink Codes.................................................... 70
4.3 BIOS Error Messages ....................................................................... 70
4.4 Port 80h POST Codes ....................................................................... 71
5Regulatory Compliance and Battery Disposal Information .. 77
5.1 Regulatory Compliance..................................................................... 77
5.1.1 Safety Standards.................................................................. 77
5.1.2 European Union Declaration of Conformity Statement................ 78
5.1.3 Product Ecology Statements................................................... 79
5.1.4 EMC Regulations .................................................................. 81
5.1.5 ENERGY STAR* 5.0, e-Standby, and ErP Compliance ................. 84
5.1.6 Regulatory Compliance Marks (Board Level) ............................. 85
5.2 Battery Disposal Information............................................................. 86

Contents
vii
Figures
1. Major Board Components.................................................................. 11
2. Block Diagram ................................................................................ 13
3. LAN Connector LED Locations............................................................ 22
4. Back Panel Audio Connectors ............................................................ 24
5. Thermal Sensors and Fan Header....................................................... 26
6. Location of the Standby Power Indicator LED....................................... 32
7. Detailed System Memory Address Map ............................................... 34
8. Back Panel Connectors ..................................................................... 37
9. I/O Shield Reference Diagram ........................................................... 38
10. Component-side Connectors and Headers ........................................... 39
11. Connection Diagram for Front Panel Header ........................................ 46
12. Connection Diagram for Front Panel USB Header.................................. 48
13. Connection Diagram for Front Panel USB Header with Intel Z-U130 USB
Solid-State Drive or Compatible Device Support (D425KTW only) ........... 48
14. Location of the BIOS Configuration Jumper Block ................................. 49
15. Board Dimensions ........................................................................... 51
16. Localized High Temperature Zones..................................................... 53
17. Fan Location Guide for Chassis Selection (Chassis Orientation is Not
Restricted) ..................................................................................... 56
Tables
1. Feature Summary.............................................................................. 9
2. Board Components Shown in Figure 1 ................................................ 12
3. Supported Memory Configurations ..................................................... 16
4. LAN Connector LED States ................................................................ 22
5. Audio Jack Support.......................................................................... 23
6. Effects of Pressing the Power Switch .................................................. 27
7. Power States and Targeted System Power........................................... 28
8. Wake-up Devices and Events ............................................................ 29
9. System Memory Map ....................................................................... 35
10. Component-side Connectors and Headers Shown in Figure 10................ 40
11. Serial Port Header ........................................................................... 41
12. LVDS Data Connector - 30-Pin (D425KTW only) ................................... 41
13. LVDS Panel Voltage Selection Jumper (D425KTW only) ......................... 42
14. LVDS Inverter Power Connector (D425KTW only) ................................. 42
15. LVDS Inverter Power Voltage Selection Jumper (D425KTW only) ............ 42
16. Chassis Fan Header ......................................................................... 42
17. SATA Connectors............................................................................. 43
18. Front Panel Wireless Activity LED Header (D425KTW only) .................... 43
19. Front Panel Audio Header for Intel HD Audio........................................ 43
20. Front Panel Audio Header for AC ’97 Audio .......................................... 43
21. Front Panel USB Header ................................................................... 44
22. Front Panel USB Header with Intel Z-U130 USB Solid-State Drive or
Compatible Device Support (D425KTW only) ....................................... 44

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
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23. Power Connector ............................................................................. 45
24. Front Panel Header .......................................................................... 46
25. States for a One-Color Power LED...................................................... 47
26. BIOS Configuration Jumper Settings................................................... 50
27. Fan Header Current Capability........................................................... 52
28. Thermal Considerations for Components ............................................. 54
29. Minimum Load Configuration Current and Power Results ....................... 57
30. Maximum Load Configuration Current and Power Results....................... 58
31. Intel Desktop Board D425KT and Intel Desktop Board D425KTW
Environmental Specifications............................................................. 59
32. BIOS Setup Program Menu Bar.......................................................... 62
33. BIOS Setup Program Function Keys.................................................... 62
34. Acceptable Drives/Media Types for BIOS Recovery ............................... 65
35. Boot Device Menu Options ................................................................ 67
36. Supervisor and User Password Functions............................................. 68
37. BIOS Beep Codes ............................................................................ 69
38. Front-panel Power LED Blink Codes.................................................... 70
39. BIOS Error Messages ....................................................................... 70
40. Port 80h POST Code Ranges.............................................................. 71
41. Port 80h POST Codes ....................................................................... 72
42. Typical Port 80h POST Sequence........................................................ 75
43. Safety Standards............................................................................. 77
44. EMC Regulations ............................................................................. 81
45. ENERGY STAR Requirements............................................................. 84
46. Regulatory Compliance Marks............................................................ 85

9
1Product Description
1.1 Overview
1.1.1 Feature Summary
Table 1 summarizes the major features of Intel Desktop Board D425KT and Intel
Desktop Board D425KTW.
Table 1. Feature Summary
Form Factor Mini-ITX, (6.7 inches by 6.7 inches [170 millimeters by 170 millimeters])
compatible with microATX
Processor Passively-cooled, soldered-down Single-Core Intel®Atom™ processor with
integrated graphics and integrated memory controller
Memory •Two 204-pin DDR3 SDRAM Small Outline Dual Inline Memory Module (SO-
DIMM) sockets
•Support for DDR3 800 MHz, DDR3 1066 MHz, and DDR3 1333 MHz SO-DIMMs
Note: DDR3 1066 MHz and DDR3 1333 MHz memory will run at 800 MHz
•Support for up to 2 GB of system memory on a single SO-DIMM (4 GB with
two SO-DIMMs)
Chipset Passively cooled, Intel®NM10 Express Chipset
Audio Multi-streaming 2+2 channel audio subsystem support based on the Realtek*
ALC662 high definition audio codec
Internal Graphics Onboard Intel®graphics subsystem with support for:
•Integrated GMCH
•Analog displays (VGA)
•Flat Panel displays (LVDS interface - D425KTW only)
Legacy I/O Control Winbond W83627DHG-A based Legacy I/O controller for hardware management,
serial, parallel, and PS/2* ports
Peripheral
Interfaces
•Eight USB 2.0 ports (D425KT only):
―Four back panel ports
―Four ports are implemented with two dual port internal headers for front
panel cabling
•Seven USB 2.0 ports (D425KTW only):
―Four back panel ports
―Two ports are implemented with a dual port internal header for front panel
cabling
―One port is implemented with an internal header (brown-colored) that
supports an Intel®Z-U130 USB Solid-State Drive or compatible device
•Two Serial ATA (SATA) 3.0 Gb/s connectors (supporting IDE and AHCI mode)
•One parallel port connector on the back panel
•One serial port connector on the back panel
•One serial port header
•PS/2*-style keyboard and mouse ports
LAN Support 10/100 Mbits/s Ethernet LAN subsystem using a Realtek 8105E Ethernet
Controller
continued

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
10
Table 1. Feature Summary (continued)
BIOS •Intel®BIOS (resident in the SPI Flash device)
•Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
and SMBIOS
Instantly Available
PC Technology
•Support for PCI* Local Bus Specification Revision 2.3
•Suspend to RAM support
•Wake on PCI, PCI Express*, PS/2, serial, front panel, USB ports, and LAN
Expansion
Capabilities
•One PCI Conventional bus connector (with riser card support for up to two PCI
cards)
•PCI Express x1 Mini Card connector (D425KTW only)
Hardware Monitor
Subsystem
•Hardware monitoring through the Windbond I/O controller
•Voltage sense to detect out of range power supply voltages
•Thermal sense to detect out of range thermal values
•One fan header
•One fan sense input used to monitor fan activity
•Fan speed control

Product Description
11
1.1.2 Board Layout
Figure 1 shows the location of the major components.
Figure 1. Major Board Components
Table 2 lists the components identified in Figure 1.

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
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Table 2. Board Components Shown in Figure 1
Item/callout
from Figure 1 Description
A Back panel connectors
B LVDS inverter panel voltage selection jumper (D425KTW only)
C Serial port header
D LVDS inverter power voltage selection jumper (D425KTW only)
E LVDS inverter power connector (D425KTW only)
F LVDS panel connector (D425KTW only)
G Processor core power connector (2 x 2)
H Intel Atom processor
I Power connector (2 x 12)
J SO-DIMM channel A socket, DIMM 0
K SO-DIMM channel A socket, DIMM 1
L Battery
M SATA connector 1
N SATA connector 0
O Front panel USB header (black)
P Front panel header
Q Standby power LED
R BIOS setup configuration jumper block
S PCI Express x1 Mini Card connector (D425KTW only)
T Intel NM10 Express Chipset
U Front Panel Wireless Activity LED Header (D425KTW only)
V Front panel USB header (black)
D425KTW only - Front panel USB header supports Intel Z-U130
USB Solid-State Drive or compatible device (brown)
W PCI conventional bus connector
X Chassis fan header
Y Front panel audio header

Product Description
13
1.1.3 Block Diagram
Figure 2 is a block diagram of the major functional areas.
Figure 2. Block Diagram

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
14
1.2 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board D425KT and
Intel Desktop Board D425KTW
http://www.intel.com/products/motherboard/index.htm
Desktop Board Support http://www.intel.com/p/en_US/support?iid=hdr+support
Available configurations for the Intel
Desktop Board D425KT and Intel
Desktop Board D425KTW
http://ark.intel.com
Supported processors http://processormatch.intel.com
Chipset information http://www.intel.com/products/desktop/chipsets/index.htm
BIOS and driver updates http://downloadcenter.intel.com
Tested memory http://www.intel.com/support/motherboards/desktop/sb/CS-
025414.htm
Integration information http://www.intel.com/support/go/buildit
1.3 Processor
The board has a passively-cooled, soldered-down Single-Core Intel Atom processor
with integrated graphics and integrated memory controller.
NOTE
The board is designed to be passively cooled in a properly ventilated chassis. Chassis
venting locations are recommended above the processor heatsink area for maximum
heat dissipation effectiveness.
For information about Refer to
Power supply connectors Section 2.2.2.3, page 45

Product Description
15
1.3.1 Intel D425 Graphics Subsystem
1.3.1.1 Intel®Graphics Media Accelerator 3150 Graphics
Controller
The Intel GMA 3150 graphics controller features the following:
•400 MHz core frequency
•High quality texture engine
⎯DX9.0c* and OpenGL* 1.4 compliant
⎯Hardware Pixel Shader 2.0
⎯Vertex Shader Model 2.0
•3D Graphics Rendering enhancements
⎯1.6 dual texture GigaPixel/s max fill rate
⎯16-bit and 32-bit color
⎯Vertex cache
•Video
⎯Software DVD at 30 fps full screen
⎯DVMT support up to 256 MB
•Display
⎯Supports analog displays up to 2048 x 1536 at 75 Hz refresh (QXGA)
⎯Supports LVDS displays up to 1366 x 768 (single channel, 18 bpp) (D425KTW
only)
⎯Dual independent display support with LVDS option (D425KTW only)
For information about Refer to
Obtaining graphics software and utilities Section 1.2, page 14

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
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1.4 System Memory
The board has two 204-pin DDR3 SO-DIMM sockets and supports the following
memory features:
•DDR3 SDRAM SO-DIMMs with gold-plated contacts
•Unbuffered, single-sided or double-sided SO-DIMMs
•4 GB maximum total system memory
•Minimum total system memory: 256 MB
•Non-ECC SO-DIMMs
•Serial Presence Detect
•DDR3 800 MHz, DDR3 1066 MHz, and DDR3 1333 MHz SO-DIMMs
(DDR3 1066 MHz and DDR3 1333 MHz memory will run at 800 MHz)
NOTE
Due to passively-cooled thermal constraints, system memory must have an operating
temperature rating of 85 oC.
The board is designed to be passively cooled in a properly ventilated chassis. Chassis
venting locations are recommended above the system memory area for maximum
heat dissipation effectiveness.
NOTE
To be fully compliant with all applicable DDR3 SDRAM memory specifications, the
board should be populated with SO-DIMMs that support the Serial Presence Detect
(SPD) data structure. This allows the BIOS to read the SPD data and program the
chipset to accurately configure memory settings for optimum performance. If non-
SPD memory is installed, performance and reliability may be impacted or the SO-
DIMMs may not function under the determined frequency.
Table 3 lists the supported DIMM configurations.
Table 3. Supported Memory Configurations
DIMM
Capacity Configuration
SDRAM
Density
SDRAM Organization
Front-side/Back-side
Number of SDRAM
Devices
1024 MB DS 1 Gbit 64 M x16/64 M x16 8
1024 MB SS 1 Gbit 128 M x8/empty 8
2048 MB DS 2 Gbit 128 M x16/128 M x16 8
2048 MB SS 2 Gbit 256 M x8/empty 8
Note: In the second column, “DS” refers to double-sided memory modules (containing two rows of SDRAM)
and “SS” refers to single-sided memory modules (containing one row of SDRAM).

Product Description
17
1.5 Intel®NM10 Express Chipset
The Intel NM10 Express Chipset provides interfaces to the processor and the USB,
SATA, LPC, LAN, PCI, and PCI Express interfaces. The Intel NM10 Express Chipset is a
centralized controller for the board’s I/O paths.
NOTE
The board is designed to be passively cooled in a properly ventilated chassis. Chassis
venting locations are recommended above the processor heatsink area for maximum
heat dissipation effectiveness.
For information about Refer to
The Intel NM10 Express chipset http://www.intel.com/products/desktop/chipsets/index.htm
Resources used by the chipset Chapter 2
1.5.1.1 Video Memory Allocation
Video memory is allocated from the total available system memory for the efficient
balancing of 2-D/3-D graphics performance and overall system performance. Dynamic
allocation of system memory to video memory is as follows:
•256 MB total RAM results in 32 MB video RAM
•512 MB total RAM results in 64 MB video RAM
•1 GB total RAM results in 128 MB video RAM
•2 GB total RAM results in 224 MB video RAM
1.5.1.2 Analog Display (VGA)
The VGA port supports analog displays. The maximum supported resolution is 2048 x
1536 (QXGA) at a 75 Hz refresh rate.
1.5.1.3 Flat Panel Interface (LVDS) - D425KTW Only
The flat panel interface (LVDS) supports the following:
•Panel support up to UXGA (1366 x 768)
•25 MHz to 112 MHz single–channel; @18 bpp
⎯TFT panel type
•Panel fitting, panning, and center mode
•CPIS 1.5 compliant
•Spread spectrum clocking
•Panel power sequencing
•Integrated PWM interface for LCD backlight inverter control

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
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1.5.1.4 Configuration Modes
For monitors attached to the VGA port, video modes supported by this board are
based on the Extended Display Identification Data (EDID) protocol.
Video mode configuration for LVDS displays (D425KTW only) is supported as follows:
•Automatic panel identification via Extended Display Identification Data (EDID) for
LVDS panels supporting EDID protocol.
•Manual LVDS panel configuration through the BIOS setup page. This feature
allows the manual entry of critical panel settings (equivalent to the 18-byte
Detailed Timings Descriptor structure defined by the VESA EDID specification) for
non-EDID panel support.
In addition, BIOS setup provides the following configuration parameters for LVDS
displays (D425KTW only):
•Screen Brightness: allows the end-user to set screen brightness for the display.
•Maintain Aspect Ratio: allows the end-user to select whether the native aspect
ratio is to be preserved during POST and before the video driver is loaded.
•LVDS Configuration Changes: allows the system integrator to “lock” critical settings
of the LVDS configuration to avoid end-users potentially rendering the display
unusable (refer to Note 1).
•Inverter Frequency and Polarity: allows the system integrator to set the operating
frequency and polarity of the panel inverter board.
•Minimum Inverter Current Limit (%): allows the system integrator to set minimum
PWM%, as appropriate, according to the power requirements of the LVDS display
and the selected inverter board.
NOTE
Support for LVDS (D425KTW only) configuration complies with the following:
1. “Unlocking” of critical settings of the LVDS configuration is supported via Intel®
Integrator Toolkit’s command-line tool.
2. Critical settings of the LVDS configuration are not exposed through Intel Integrator
Toolkit or Intel®Integrator Assistant GUIs.
3. Critical settings of the LVDS configuration will not be overwritten by loading BIOS
setup defaults.
4. Critical settings of the LVDS configuration will be preserved across BIOS updates.

Product Description
19
1.5.2 USB
The board provides up to eight USB 2.0 ports, supports UHCI and EHCI, and uses
UHCI- and EHCI-compatible drivers. The port arrangement is as follows:
•Eight USB 2.0 ports (D425KT only):
⎯Four back panel ports
⎯Four ports are implemented with two dual port internal headers for front panel
cabling
•Seven USB 2.0 ports (D425KTW only):
⎯Four back panel ports
⎯Two ports are implemented with a dual port internal header for front panel
cabling
⎯One port is implemented with an internal header (brown-colored) that supports
an Intel®Z-U130 USB Solid-State Drive or compatible device
NOTE
Computer systems that have an unshielded cable attached to a USB port may not
meet FCC Class B requirements, even if no device is attached to the cable. Use
shielded cable that meets the requirements for full-speed devices.
For information about Refer to
The location of the USB connectors on the back panel Figure 8, page 37
The location of the front panel USB headers Figure 10, page 39
1.5.3 SATA Support
The board provides two SATA interface connectors that support one device per
connector.
The board’s SATA controller offers independent SATA ports with a theoretical
maximum transfer rate of 3.0 Gbits/s on each port. One device can be installed on
each port for a maximum of two SATA devices. A point-to-point interface is used for
host to device connections, unlike PATA which supports a master/slave configuration
and two devices on each channel.
For compatibility, the underlying SATA functionality is transparent to the operating
system. The SATA controller supports IDE and AHCI configuration and can operate in
both legacy and native modes. In legacy mode, standard ATA I/O and IRQ resources
are assigned (IRQ 14 and 15). In native mode, standard PCI Conventional bus
resource steering is used. Native mode is the preferred mode for configurations using
the Windows* XP and Windows Vista* operating systems.
For information about Refer to
Obtaining AHCI driver Section 1.2, page 14
The location of the SATA connectors Figure 10, page 39

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
20
1.6 Real-Time Clock Subsystem
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years. When the computer is plugged in, the standby current from the power
supply extends the life of the battery. The clock is accurate to ±13 minutes/year at
25 ºC with 3.3 VSB applied.
NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded
into CMOS RAM at power-on.
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate. Replace the
battery with an equivalent one. Figure 1 on page 11 shows the location of the battery.
1.7 Legacy I/O Controller
The Legacy I/O Controller provides the following features:
•One serial port header
•One serial port connector on the back panel
•One parallel port connector with Extended Capabilities Port (ECP) and Enhanced
Parallel Port (EPP) support
•Serial IRQ interface compatible with serialized IRQ support for PCI Conventional
bus systems
•PS/2-style keyboard and mouse ports
•Intelligent power management, including a programmable wake-up event interface
•PCI Conventional bus power management support
The BIOS Setup program provides configuration options for the Legacy I/O controller.
For information about Refer to
The location of the serial port header Figure 10, page 39
The serial port header signal mapping Table 11, on page 41