Intel YM430TX User manual

YM430TX
Pentium®Processor-Based
Motherboard User’s Manual

2 Intel YM430TX User’s Manual
InformationinthisdocumentisprovidedinconnectionwithIntelproducts.Nolicense,
express or implied, by estoppel or otherwise, to any intellectual property rights is
granted by this document. Except as provided in Intel’sTerms and Conditions of Sale
for such products, Intel assumes no liability whatsoever, and Intel disclaims any ex-
press or implied warranty, relating to sale and/or use of Intel products including liabil-
ity or warranties relating to fitness for a particular purpose, merchantability, or in-
fringement of any patent, copyright or other intellectual property right. Intel products
are not intended for use in medical, life saving, or life sustaining applications. Intel
may make changes to specifications and product descriptions at any time, without
notice.
Copyright © 1997, Intel Corporation. Third-party brands and trademarks are the prop-
erty of their respective owners.
Product Name: Intel YM430TX
Manual Revision: 1.00
Release Date: May 1997

Intel YM430TX User’s Manual 3
Getting Help
World Wide Web
http://www.intel.com
Telephone
Talk to a Customer Support Technician* (Intel reserves the right to change
pricing for telephone support at any time without notice)
In U.S.: 1-900-555-5800 (M–F, 7:00
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Calls billed at U.S. $2.50 per minute
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In Europe: contact Intel at http://www.intel.com/intel/contact for up-to-date
technical support phone numbers
In Asia-Pacific region (Singapore local time, Oct–April: M–F, 6:00
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pm ; April–Oct: M–F, 5:00 am –4:00 pm ) Credit card calls billed at U.S. $25
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Australia (Sydney): [phone]
Hong Kong: [phone]
Korea: [phone]
PRC: [phone]
Singapore: [phone]
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Rest of the world: CalltheNorthAmericanServiceCenterat+1-916-377-7000
(M–F, 7:00
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* Or contact your local dealer or distributor.
Technical Training & Support
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the Genuine Intel Dealer Program (Asia-Pacific Region), or the Intel Proces-
sor Integrator Program (Europe), you are eligible for technical training and
support.
InU.S.andCanada: 1-800-538-3373,ext.442(M–F, 5:00
am –5:00 pm ,PST)
In Europe: contact your distributor or fax your details to European Literature
on [phone]
InAsia: [phone] (M–F, 8:30
am –5:30 pm , Singapore local time) or via
e-mail: AP[email protected]

4 Intel YM430TX User’s Manual
Contents
1. Introduction .......................................................................................... 7
How this Manual is Organized.............................................................. 7
Item Checklist....................................................................................... 7
2. Features ............................................................................................... 8
Features of the Intel YM430TX Motherboard ....................................... 8
The Intel YM430TX Motherboard ....................................................... 11
3. Installation .......................................................................................... 12
Intel YM430TX Motherboard Layout .................................................. 12
Installation Steps ................................................................................ 14
1. Set Jumpers on the Motherboard.................................................. 14
Jumper Settings ................................................................ 15
2. Install Memory Modules ................................................................ 18
SIMM Memory Installation................................................. 19
DIMM Memory Installation................................................. 20
3. Install the Processor. ..................................................................... 21
4. Install Expansion Cards................................................................. 22
Expansion Card Installation Procedure ............................. 22
Assigning IRQs for Expansion Cards ................................ 22
Assigning DMA Channels for ISA Cards ........................... 23
5. Connect Cables, Wires, and Power Supply ................................... 24
Power Connection Procedures ..................................................... 30
4. BIOS Software ................................................................................... 31
Support Software................................................................................ 31
Flash Memory Writer Utility........................................................... 31
Main Menu......................................................................... 32
Advanced Features ........................................................... 32
Managing & Updating your Motherboard’s BIOS.......................... 33
BIOS Setup ........................................................................................ 34
Setup Utility ....................................................................... 34
Load Defaults ................................................................... 35
Standard CMOS Setup...................................................... 35
Details of Standard CMOS Setup...................................... 36
BIOS Features Setup.................................................................... 38
Details of BIOS Features Setup ........................................ 38
Chipset Features Setup ................................................................ 40
Details of Chipset Features Setup..................................... 41

Intel YM430TX User’s Manual 5
Power Management Setup ........................................................... 44
Details of Power Management Setup................................ 44
PNP and PCI Setup ...................................................................... 46
Details of PNP and PCI Setup........................................... 46
Load BIOS Defaults ...................................................................... 48
Load Setup Defaults ..................................................................... 48
Supervisor Password and User Password ................................... 49
IDE HDD Auto Detection............................................................... 50
Save & Exit Setup......................................................................... 51
Exit Without Saving....................................................................... 51
5. Support Software ............................................................................... 52
Intel YM430TX Software and Manual CD .......................................... 52

6 Intel YM430TX User’s Manual
FCC & DOC Compliance
Federal Communications Commission Statement
This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installa-
tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer’s instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interfer-
ence by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING! The use of shielded cables for connection of the monitor to the graph-
ics card is required to assure compliance with FCC regulations. Changes or modifi-
cations to this unit not expressly approved by the party responsible for compliance
could void the user’s authority to operate this equipment.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.

Intel YM430TX User’s Manual 7
1. Introduction
(Sections/Checklist)
1. Introduction
How this Manual is Organized
This manual contains the following sections:
1. Introduction — document organization and product checklist
2. Features — product information and specifications
3. Installation — instructions for setting up the motherboard
4. BIOS Setup — instructions for setting up the BIOS software
5. Support Software — description of software drivers and utilities
Item Checklist
Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.
þIntel YM430TX motherboard
þ2 serial port ribbon cables attached to a mounting bracket
þ1 parallel ribbon cable with a mounting bracket
þ1 IDE ribbon cable
þ1 floppy ribbon cable
þ1 CD-ROM containing the following items
• Windows 95 update utility for the 430TX PCIset
• ISA configuration utility
• flash memory writer utility to update the flash BIOS
• warranty
• user’s manual
• readme files for descriptions and use of the files
þIntel PS/2 mouse/USB connector card

8 Intel YM430TX User’s Manual
(Intel YM430TX)
2. Features
2. Features
Features of the Intel YM430TX Motherboard
The IntelYM430TX motherboard is designed for the demanding PC user who wants
many intelligent features in a small package. This motherboard has the following
features:
•Intel Chipset: Intel’s 430TX PCIset with I/O subsystems.
•Multi-Processor/Multi-Speed Support: Supports 90- to 200-MHz Intel Pen-
tium
®
processors and 166- to 233-MHz Intel Pentium
®
processors with MMX
technology.
•Versatile Memory Support: Two DIMM sockets support up to 256 MB of 8 to
128MB, 168-pin, 3.3-volt SDRAM/EDO memory modules. Four SIMM sock-
ets support up to 256 MB of 4 to 64MB, 72-pin fast page mode (FPM) or
extended data out (EDO) memory modules. SIMMs and DIMMscannot be used
at the same time.
•EasyInstallation: The BIOS supportsauto detection ofharddrives, PS/2 mouse,
and Plug and Play devices to simplify setup.
•Dual PowerSupply: Two onboard power connectors support eitherATorATX
power supplies with soft-on/off features.
•ISA and PCI Expansion Slots: Two 16-bit ISA slots, three 32-bit PCI slots,
and one shared PCI/ISA slot.
•SuperMulti-I/O: Provides two high-speed, UART-compatible serial ports; one
parallel port with EPP and ECP capabilities; and an integrated keyboard control-
ler. Supports two floppy drives of either 5.25” or 3.5” (1.44 MB or 2.88 MB)
without an external card. Supports Japanese Floppy 3 mode (3.5” disks: 1.2MB)
and LS-120 floppy drives (3.5” disks: 120MB, 1.44MB, 720K).
• Desktop Management Interface (DMI): BIOS supports DMI, allowing hard-
ware to communicate within a standard protocol. (Requires DMI-enabled com-
ponents.)
•PCI Bus Master IDE Controller: The onboard Ultra DMA/33 Bus Master
IDE controller with two connectors supports four IDE devices in two channels,
allowing IDE transfer rates up to 33MB per second, and also supports enhanced
IDE devices. This controller supports PIO Modes 3 and 4 and Bus Master IDE
DMA Mode 2. BIOS supports IDE CD-ROM or SCSI bootup.
•Level 2 Cache: 512KB pipelined burst SRAM onboard.
•PS/2 Mouse, USB Connector: Includes a cable and bracket set to mount the
connectors to an unused expansion slot on the system chassis.

Intel YM430TX User’s Manual 9
2. Features
(Intel YM430TX)
Performance:
• SDRAM Optimized Performance – Synchronous dynamic random access
memory (SDRAM) increases the data transfer rate from a maximum of 264 MB
per second using EDO memory to a maximum of 528 MB per second using
SDRAMs.
• Double the IDE Transfer Speed – Intel’s 430TX PCIset improves the IDE
transfer rate by using Bus Master UltraDMA/33 IDE, which can transfer data at
rates up to 33MB per second. This new technology is compatible with existing
ATA-2 IDE specs, so there is no need to upgrade current hard drives or cables.
•ConcurrentPCI–Concurrent PCIallows multiplePCI transfersfrom PCImaster
buses to memory to CPU.
• ACPI Ready – The advanced configuration and power interface (ACPI) pro-
vides more energy-saving features for future operating systems (OS) by sup-
portingOS-directpower management (OSPM).With these features implemented
in the OS, PCs can be ready around the clock every day, yet satisfy energy-
saving standards. To fully utilize the benefits of ACPI, systems must use an
ACPI-supported OS — such as the successor to Windows 95.
Intelligence:
• Virus Write Protection – Normally, viruses can destroy data on storage media.
Some new-generation viruses can also clear BIOS data, which is usually unpro-
tected. The IntelYM430TX motherboard was designed to cooperate with BIOS,
chipset, and flash memory to disable write permission when the system’s initial-
ization stage is completed upon boot-up.
• Auto Fan Off – The CPU fan will power off automatically even in sleep mode.
This feature reduces both energy consumption and system noise, and is an im-
portant feature for silent PC systems.
• Dual-function Power Button (requiresATX powersupply) – The system can
be in one of two states, sleep or soft-off. Pressing the power button for less than
4 seconds places the system into sleep mode. Pressing the power button for
more than 4 seconds places the system into soft-off mode.
• Remote Ring On (requires ATX power supply) – This feature allows a com-
puter to be turned on remotely through a modem. With this feature enabled, any
usercan accessvitalinformation fromtheir computer fromanywhere inthe world.
• Message LED – By illuminating in different ways, chassis LEDs can provide
meaningfulinformation. For example,an LED mightblink toindicatethat thefax/
modem is transferring data or light steadily to indicate that the fax/modem is idle.

10 Intel YM430TX User’s Manual
(This page was intentionally left blank)

Intel YM430TX User’s Manual 11
The Intel YM430TX Motherboard
2. Features
(Intel YM430TX)
CPU ZIF
Socket 7
Serial, Parallel, Floppy
2 DIMM Sockets
PS/2 Mouse, USB
4 SIMM Sockets
AT Power
Connector
Keyboard
3 PCI Slots
1 ISA/PCI Share
2ISA Slots
IDE Connectors
Programmable
Flash ROM
ATX Power
Connector
Intel’s 430TX
PCIset
Switching Voltage Regulators 512KB Pipelined Burst L2 Cache

12 Intel YM430TX User’s Manual
3. Installation
Intel YM430TX Motherboard Layout
(Motherboard Layout)
3. Installation
ATX Power Input
Serial Ports
Panel Connectors
CPU ZIF Socket 7
BBLKW
RTCLR
Intel
PIIX4
PCIset
Secondary IDE Primary IDE
Super Multi-I/O
Flash BIOS
512KB Pipelined Burst L2 Cache
Intel
430TX
PCIset
USB, PS/2 Mouse
Clock
Freq
DIMM Socket 1 (64-bit, 168-pin module) DIMM Socket 2 (64-bit, 168-pin module)
IDE LED
Switching Voltage Regulators
Freq. Ratio
AT Power Input
P8
P9
CR2032 3Volts
Lithium Cell
BIOS Power
01
COM 2
COM 1
Floppy Drives
Parallel Port
FS1 FS0
BF0 BF1
CPU Fan
01 23 Row
SIMM Socket 1 (32-bit, 72-pin module) SIMM Socket 2 (32-bit, 72-pin module) SIMM Socket 3 (32-bit, 72-pin module) SIMM Socket 4 (32-bit, 72-pin module)
01 23 23 Row
PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Slot 4
Key-
board
CPU Voltage
ISA Slot 3 ISA Slot 2 ISA Slot 1
VID0

Intel YM430TX User’s Manual 13
(Motherboard Layout)
3. Installation
Jumpers
BBLKW p. 15 Flash Memory Boot Block Program (Boot
Block Write-Protect/Boot Block Write Enable)
RTCLR p. 15 Real Time Clock RAM
(Keep CMOS/Clear CMOS)
VID0, VID1, VID2 p. 16 Voltage Regulator Output Selection
FS0, FS1, FS2 p. 16 CPU External Clock (Bus) Frequency Selection
BF0, BF1 p. 16 CPU-to-Bus Frequency Ratio
Expansion Slots
SIMM Sockets p. 19 SIMM Installation
DIMM Sockets p. 20 DIMM Installation
ZIF Socket 7 p. 21 CPU Installation
PCI and ISA Slots p. 22 Expansion Cards
Connectors
KBCON p. 24 Keyboard Connector (5-pin Female)
FLOPPY p. 24 Floppy Drive Connector (34-pin Block)
PRINTER p. 25 Parallel Printer Connector (26-pin Block)
COM1, COM2 p. 25 Serial Port COM1 & COM2 Connectors
(10-pin Blocks)
FAN p. 26 CPU Cooling Fan Connector
Primary / Secondary IDE p. 26 Primary / Secondary IDE Connectors
(40-pin Blocks)
IDELED p. 27 IDE Activity LED
USB / PS/2 p. 27 PS/2 Mouse, USB (18-pin Block)
MSG LED (PANEL) p. 28 Message LED Lead (2 pins)
SMI (PANEL) p. 28 SMI Suspend Switch Lead (2 pins)
PWR SW (PANEL) p. 28 ATX Power Switch/Soft Power Switch Lead
(2 pins)
RESET (PANEL) p. 28 Reset Switch Lead (2 pins)
KEYLOCK / PWR LED (PANEL) p. 28 Keyboard Lock Switch
and System Power Lead (5 pins)
SPEAKER (PANEL) p. 28 Speaker Connector (4 pins)
AT POWER p. 29 AT Motherboard Power Connector
(12-pin Block)
ATXPWR p. 29 ATX Motherboard Power Connector
(20-pin Block)

14 Intel YM430TX User’s Manual
(Jumpers)
3. Installation
Installation Steps
Before using your computer, you must complete the following steps:
1. Set jumpers on the motherboard.
2. Install memory modules.
3. Install the processor.
4. Install expansion cards.
5. Connect ribbon cables, cabinet wires, and power supply.
6. Set up the BIOS software.
1. Set Jumpers on the Motherboard.
Several hardware settings are made by using jumper caps to connect jumper pins
(JP) on the motherboard. See the motherboard layout on page 12 for locations of
jumpers. The jumper settings are described numerically , such as [----], [1-2], [2-3].
For no connection, connect pins 1 and 2 and connect pins 2 and 3. Pin 1 is always
on top
Pin 1
or on the left
Pin 1
when holding the motherboard with the keyboard
connector away from you. A“1” is written beside pin 1 on jumpers with three pins.
The jumpers are also shown graphically such as to connect pins 1&2 and
to connect pins 2&3. Jumpers with two pins are shown as for short (on)
and for open (off). For manufacturing simplicity, the jumpers may be sharing
pins from other groups. Use the diagrams in this manual instead of following the
pin layout on the board. Settings with two jumper numbers require that both jump-
ers be moved together. To connect the pins, simply place a plastic jumper cap over
the two pins as diagrammed.
WARNING! Computer motherboards and components contain very delicate
integrated circuit (IC) chips. To protect the motherboard and other compo-
nents against damage from static electricity, you should follow some precau-
tions whenever you work on your computer.
1. Unplug your computer before working on the inside.
2. Use a grounded wrist strap when handling computer components. If you do
not have one, touch both of your hands to a safely grounded object or to a
metal object, such as the power supply case.
3. Hold components by the edges and try not to touch the IC chips, leads, or
circuitry.
4. Place components on a grounded antistatic pad or on the bag that came with
the component whenever the components are separated from the system.

Intel YM430TX User’s Manual 15
3. Installation
(Jumpers)
Jumper Settings
1. Flash Memory Boot Block Programming (BBLKW)
Thissetstheoperationmodeofthebootblockareaoftheprogrammableflashmemory
to allow programming in the Boot Block Write Enable position. This is required
only if prompted by the Flash Memory Writer Utility (see BIOS Software).
Programming BBLKW
Boot Block Write-Protect [1-2] (Default)
Boot BLock Write Enable [2-3]
Boot Block Programming
Boot Block
Write Protect
(Default)
BBLKW
Boot Block
Write Enable
BBLKW
2. Real Time Clock (RTC) RAM (RTCLR)
The CMOS RAM is powered by the onboard button cell battery. To clear the
RTC data: (1) Turn off your computer and unplug the AC power, (2) Move this
jumper to“ClearCMOS,” (3) Move the jumper back to “Keep CMOS,” (4) Turn
on your computer, (5) Hold down <Delete> during bootup and enter BIOS setup
to re-enter user preferences.
Battery Test Jumper (RTCLR)
You can test the battery’s current by removing this jumper and attaching a cur-
rent meter to pins 1& 2.
WARNING! Before testing, ensure that there is no power to your motherboard.
Testing can clear the CMOS RAM containing BIOS setup information. Use the
BIOS setuptore-enter userinformation afterremovingand reapplyingthis jumper.
RTC RAM RTCLR
Keep CMOS [1-2] (Default)
Clear CMOS [2-3] (momentarily)
RTC RAM
Clear CMOS
RTCLR
Keep CMOS (Default)
RTCLR
Battery Test

16 Intel YM430TX User’s Manual
(Jumpers)
3. Installation
3. Voltage Regulator Output Selection (VID0)
These jumpers set the voltage supplied to the CPU. The onboard voltage regulators
will automatically detect and switch between single power plane & dual power
plane CPUs.A CPU is usually referred to by its Vcore voltage.
(Single Plane) (Dual Plane)
Type Vcore Vio Vcore Vio VID0
VRE 3.5V 3.5V 2.9V 3.3V [1-2]
STD 3.4V 3.4V 2.8V 3.3V [2-3]
CPU Vcore Voltage Selection
Single Plane
Dual Plane VRE (3.5V)
(2.9Volt)
1
2
3
VID 0
STD (3.4V)
(2.8Volt)
1
2
3
VID 0
4. CPU External (Bus) Frequency Selection (FS0, FS1, FS2)
These jumpers tell the clock generator what frequency to send to the CPU.
These allow the selection of the CPU’s external frequency (or bus clock).
The bus clock times the bus ratio equals the CPU’s internal frequency (the
advertised CPU speed).
5. CPU to Bus Frequency Ratio (BF0, BF1)
These jumpers set the frequency ratio between the internal frequency of the CPU
and the external frequency (called the bus clock) within the CPU. These must be
set together with the jumpers for CPU External (Bus) Frequency Selection.
CPU : BUS Frequency Ratio
BF1
1
2
33.0(3/1)
BF0 BF1
1
2
32.5x(5/2)
BF0
BF1
1
2
31.5X(3/2)
BF0
BF1
1
2
32.0x(2/1)
BF0
CPU External Clock (BUS)
Frequency Selection
FS1
1
2
366MHz
FS0
FS1
1
2
360MHz
FS0

Intel YM430TX User’s Manual 17
(Jumpers)
3. Installation
Set the jumpers for the internal speed of the Intel Pentium processor as follows:
(BUS Freq.) (Freq. Ratio)
Freq. Ratio Bus Freq. FS0 FS1 BF0 BF1
233 MHz 3.5x 66 MHz [2-3] [1-2] [1-2] [1-2]
200 MHz 3.0x 66 MHz [2-3] [1-2] [1-2] [2-3]
166 MHz 2.5x 66 MHz [2-3] [1-2] [2-3] [2-3]
150 MHz 2.5x 60 MHz [1-2] [2-3] [2-3] [2-3]
133 MHz 2.0x 66 MHz [2-3] [1-2] [2-3] [1-2]
120 MHz 2.0x 60 MHz [1-2] [2-3] [2-3] [1-2]
100 MHz 1.5x 66 MHz [2-3] [1-2] [1-2] [1-2]
90 MHz 1.5x 60 MHz [1-2] [2-3] [1-2] [1-2]

18 Intel YM430TX User’s Manual
(Memory)
3. Installation
2. Install Memory Modules
This motherboard supports four 72-pin, 32-bit single inline memory modules
(SIMMs) of 4, 8, 16, 32, or 64 MB each, to form a memory size between 8 and 256
MB. The SIMMs can be either 60ns or 70ns, asymmetric or symmetric, fast page
mode (FPM) or enhanced data out (EDO) memory. (BEDO & parity are not sup-
ported). SIMMs must be installed in pairs so that each row contains 64 bits of the
same size and type of chips. One side of the SIMM module (with chips) takes up
half a row on the motherboard. (Refer to the motherboard layout on page 6 .)
Dual inline memory modules (DIMMs) can be used when SIMMs are not used.
Two sockets are available for 3.3-volt power level, unbuffered synchronous DRAMs
(SDRAMs) or EDO DRAMs of either 8, 16, 32, 64, or 128 MB each to form a
memory size between 8 and 256 MB. One side of the DIMM module (with chips)
takes up one row on the motherboard.
IMPORTANT: You must set up memory speed through “Auto Configuration” in
the BIOS Chipset Setup of the BIOS software. If both 60ns and 70ns memory are
used, set “Auto Configuration” to 70ns. Do not use memory modules with more than
24 chips per module. Modules with more than 24 chips exceed the design specifica-
tions of the memory subsystem and will be unstable.
Memory Socket SIMM Memory Module Total Memory
SIMM Sockets 1&2 4MB, 8MB, 16MB, 32MB, 64MB x2
(Rows 0 & 1) 72-pin FPM or EDO SIMM
(DIMM Sockets must be empty)
SIMM Sockets 3&4 4MB, 8MB, 16MB, 32MB, 64MB x2
(Rows 2 & 3) 72-pin FPM or EDO SIMM
(DIMM Sockets must be empty)
Total System Memory (Max 256 MB) =
WARNING! Do not install both SIMMs and DIMMs at the same time or you will
burn your memory. To mix SIMMs and DIMMs, you must use 5.0-volt-tolerant
(signal level) memory chips, which are currently unavailable.
Memory Socket DIMM Memory Module Total Memory
DIMM Socket 1 8MB, 16MB, 32MB, 64MB, 128MB x1
(Rows 0 & 1) 168-pin SDRAM or EDO DIMM
(SIMM Sockets must be empty)
DIMM Socket 2 8MB, 16MB, 32MB, 64MB, 128MB x1
(Rows 2 & 3) 168-pin SDRAM or EDO DIMM
(SIMM Sockets must be empty)
Total System Memory (Max 256MB) =

Intel YM430TX User’s Manual 19
(SIMMs)
3. Installation
SIMM Memory Installation
1. The SIMM memory modules will fit in only one orientation as shown because
a plastic safety tab on one end of the SIMM sockets fits the notched end of the
SIMM memory modules.
72 Pin SIMM Sockets
1234
Notched End
2. Press the memory module firmly into place starting from a 45-degree angle and
making sure that all the contacts are aligned with the socket.
3. With your fingertips, rock the memory module into a vertical position so that it
clicks into place. The plastic guides go through the two mounting holes on one
side, and the metal clips snap on the other side.
72 Pin DRAM in SIMM Socket
Clip
Plastic Safety Tab (This Side Only) Mounting Hole
To release the memory module, squeeze both metal clips outward and rock the
module out of the metal clips.

20 Intel YM430TX User’s Manual
(DIMMs)
3. Installation
DIMM Memory Installation
Use 3.3-volt unbuffered DIMMs, and insert the modules as shown. The modules
will fit in only one orientation as shown because different numbers of pins are lo-
cated between notches. The notches in the DIMM modules (shown in the figure
below) identify the type and also prevent the wrong type of DIMM from being
inserted into the DIMM socket.
168 Pin DIMM Memory Sockets Lock
Dimm Socket 1 Dimm Socket 2
88 Pins
60 Pins
20 Pins
168-Pin DIMM Notch Key Definitions
DRAM Key Position Voltage Key Position
Unbuffered
RFU
Buffered Reserved
3.3V
5.0V
Four clock signals are supported on this motherboard. Check with your vendor for
the specifications before purchasing memory modules.