Telephony:
This connects the monoraul audio signals of an internal telephony device to the audio system.
A monoraul audio-in and audio-out signal interface is necessary for telephony applications such as speakerphones, fax/modems and answering machines.
Line In: This connects the left and right channels of an internal audio device to the audio subsystem.
An audio-in signal interface of this type is necessary for applications such as TV tuners.
CD-ROM Audio: This connects an internal CD-ROM drive to the audio mixer.

Battery

This illustration is a closer view of the coin cell style battery which provides power to the RTC (Real-Time Clock) and CMOS SRAM memory.
When the system is plugged in, the 3.3 V standby current from the power supply extends the life of the battery.

The clock provides a time-of-day clock and a multicentury calendar with alarm features and a century rollover.
It also supports 256 bytes of battery-backed CMOS SRAM in two banks reserved for BIOS use.
The RTC is accurate to ± 13 min/year at 25°C with 3.3 VSB applied.
The time, date and SRAM values can be specified and returned to their defaults in the Setup program.

Bios

This motherboard uses an Intel/AMI BIOS, which is stored in flash memory and may be upgraded using a disk-based program.
In addition to the BIOS, the flash memory contains the Setup program, Power-On Self Test (POST), Advanced Power Management (APM) software, the PCI auto-configuration utility, and Windows 95-ready Plug and Play.
The BIOS displays a message during POST identifying the type of BIOS and the revision code.

DIMM Configuration

The motherboard has two Dual Inline Memory Module (DIMM) sockets.
Minimum memory size is 16MB; maximum size is 256 MB. The BIOS automatically detects memory type, size, and speed.
The motherboard is stamped with "DIMM 0" and "DIMM 1" near the appropriate socket. Memory can be installed in one or both sockets.
Memory size can vary between sockets. Note: Pentium II processors with 100 MHz host bus should be paired only with 100 MHz SDRAM.
Processors with 66 MHz host bus can be paired with either 66 MHz or 100 MHz SDRAM.

The motherboard supports the following memory features:

168-pin DIMMs with gold-plated contacts 66 and 100 MHz (matching Host Bus speed) unbuffered SDRAM only Non-ECC (64-bit) and ECC (72-bit) memory 3.3 V memory only Single or double-sided DIMMs.

DIMM Size Non-ECC Configuration	ECC Configuration
16MB 2 Mbit x 64 2 Mbit x 72	32MB 4 Mbit x 64 4 Mbit x 72
64MB 8 Mbit x 64 8 Mbit x 72	128MB 16 Mbit x 64 16 Mbit x 72

SDRAM

Synchronous DRAM improves memory performance via memory access that is synchronous with the memory clock.
This simplifies the timing design and increases memory speed because all timing is dependent on the number of memory clock cycles.

ECC Memory

Error checking and correcting (ECC) memory detects multiple-bit errors and corrects single-bit errors.
When ECC memory is installed, the BIOS supports both ECC and non-ECC mode (ECC mode is enabled in the Setup program).
The BIOS automatically detects if ECC memory is installed and provides the Setup option for selecting ECC mode.

Note: If non-ECC memory is installed, the Setup option for ECC mode does not appear.

Memory Error Detection Mode Established in Setup Program:
This table describes the effect of using Setup to put each memory type in each supported mode.
Whenever ECC mode is selected in Setup, some performance loss occurs.
ECC Disabled ECC Enabled
Non-ECC DIMM No error detection N/A
ECC DIMM No error detection Single-bit error correction,
multiple-bit error detection

Drive Connections

This is a closer view of the motherboard's IDE/Floppy interfaces.
In this picture, pin one is the lower left-most pin of each interface.
As you view the motherboard, pin one will be furthest from the coin cell style battery (just outside of this picture-to the right).
I/O Ports

This is a closer view of the motherboard's I/O connections.
The ports are integrated into the motherboard and have no separate cable connecting the ports to the motherboard.
The I/O panel has a parallel port, serial port, VGA port, two PS/2 ports, two USB (Universal Serial Bus) connectors and three audio jacks.

In this picture, from left to right, the audio jacks are:
Audio line out, Audio line in and Mic in. Unlike this picture, the audio jacks are color coded.

Onboard Audio

Audio Driver Download for the Integrated Sound Blaster AudioPCI 64D chipset

The audio subsystem consists of these devices:

Sound Blaster AudioPCI 64D audio controller (based on the Creative Labs 1373 chipset)
Crystal Semiconductor CS4297 audio codec
Creative Labs 1373 based audio subsystem

Creative Labs 1373 based audio subsystem features:

Analog and digital audio
PCI 64 voice wavetable synthesizer
Mixer application
3-D positional audio
Direct Sound 5.0, Direct Sound 3-D, Direct Music
Real-mode DOS compatibility
Interfaces to PCI bus as a Plug and Play device
Access to main memory (through the PCI bus) for wavetable
synthesis support-does not require a seperate wavetable ROM device.
PC98 compliant
Crystal Semiconductor CS4297 Stereo Audio Codec

High performance 18-bit stereo full-duplex audio codec with up to 48 kHz sampling rate.
Audio Connectors
Back panel audio jacks: Line-out, Line-in, Mic-in, and MIDI/Game Port
Atapi-style connectors: CD-ROM Audio, Line-In, Telephony

Onboard Video

The face of the graphics controller chip is not seen because of its heatsink.
The integrated A.G.P. is high-performance and for graphics-intensive applications (such as 3-D). A.G.P. is independent of the PCI bus.

Video Driver Download for the Integrated NVIDIA NV3T chipset

nVidia RIVA 128ZX controller features:

The Nvidia Riva 128ZX graphics controller is paired with 8 MB of 100 MHz SDRAM video memory and features:
2.x AGP graphics support
Resolutions up to 1600 x 1200 x 32 bits per pixel at 75 Hz refresh rate
64-bit graphics pipeline to video memory
High performance, 128-bit 2D/GUI/DirectDraw acceleration
Interactive, Direct 3D acceleration
Direct3D texture lighting
Video acceleration for DirectDraw/DirectVideo, MPEG-1, MPEG-2 and Indeo video technology
ACPI power management

Refresh Rates: Resolution Bit Depth Refresh Rates (Hz) 320 X 200 8,16,32 70,72,75,85,85,100,120* (DDraw only) 320 X 240 8,16,32 60,70,72,75,85,85,100,120* (DDraw only) 400 X 300 8,16,32 60,70,72,75,85,85,100,120* (DDraw only) 480 X 360 8,16,32 60,70,72,75,85,85,100,120* (DDraw only) 512 X 384 8,16,32 60,70,72,75,85,85,100,120* (DDraw only) 640 X 400 8,16,32 70,72,75,85,85,100,120* (DDraw only) 640 X 480 8,16,32 60,70,72,75,85,85,100,120 800 X 600 8,16,32 60,70,72,75,85,85,100,120 960 X 720 8,16,32 60,70,72,75,85,85,100,120* (DDraw only) 1024 X 768 8,16,32 60,70,72,75,85,85,100,120 1152 X 864 8,16,32 60,70,72,75,85,85,100,120 1280 X 1024 8,16,32 60,70,72,75,85,85,100,120 1600 X 1200 8,16,32 60,70,72,75,85
* A refresh rate of 120 Hz is required for direct draw drivers.

Processor Support

The motherboard supports a single Pentium II or Celeron processor.
The processor's VID pins automatically program the motherboard's voltage regulator to the required processor voltage.
Also, the host bus speeds (66 or 100 MHz) are automatically selected.
Note: The motherboard supports Celeron processors with a 66-MHz host bus and Pentium II processors with a 100 or 66 MHz host bus.
Processors with a 100 MHz host bus should be used only with 100 MHz SDRAM; the motherboard will not operate reliably if a processor with a 100 MHz host bus is paired with 66 MHz SDRAM.
However, processors with a 66 MHz host bus can be used with either 66 MHz or 100 MHz SDRAM.
Either processor connects to the motherboard through the Slot 1 connector, a 242-pin edge connector. When it is mounted in Slot 1, the processor is secured by a retention mechanism attached to the motherboard.

Processor Upgrades
This motherboard can be upgraded from a Celeron processor to a Pentium II processor or from a Celeron or Pentium II processor to one that runs at a higher speed.
When upgrading the processor, use the configure mode to change the processor speed.

Second-Level Cache
The second-level cache is located on the substrate of the SEC cartridge.
The cache includes pipelined burst synchronous static RAM (PBSRAM) and tag RAM.
There can be two or four PBSRAM components totaling 512KB or 1024KB in size. All supported onboard memory can be cached.

Supported Processors Table: Processor Type Processor Speed Host Bus Frequency Cache Size Package Type PENTIUM II 233 66 MHz 512 KB S.E.C. cartridge 266 66 MHz 512 KB 300 66 MHz 512 KB 333 66 MHz 512 KB 350 100 MHz 512 KB 400 100 MHz 512 KB CELERON 266 66 MHz None S.E.P.P. 300 66 MHz None 300 A 66 MHz 128 KB 333 66 MHz 128 KB

System Jumper

Moving the jumper with the power on may damage the computer.
Turn the power off and unplug the power cord before changing the jumper.
The jumper block J10B2on the Intel 440BX motherboard enables all motherboard configuration to be done in BIOS Setup.

The table below shows the settings for each task.

J10B2 Mode Jumper Configuration Normal 1-2 The BIOS uses current configuration information and passwords for booting.
Configure 2-3 After the POST runs, Setup runs automatically.
The maintenance menu is displayed.
This menu sets processor speed and clears passwords.
Recovery None The BIOS attempts to recover the BIOS configuration.
A recovery diskette is required.