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EP-PT21
Motherboard for
Pentium MMX ™
User's Manual
Order Number 41010007
November, 1997
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EC-CONFORMITY DECLARATION
(EC conformity marking)
FOR THE FOLLOWING EQUIPMENT:
Product Name : MOTHERBOARD
Model: EP-PT21
Manufacturer: ENPC TECHNOLOGY CORP.
Manufacturer Address: 6FL., No. 19, Wu Chuan 6 Rd.,
Wu-Ku Industrial Park, Taipei, Taiwan.
IS HEREWITH CONFIRMED TO COMPLY WITH THE EQUIPMENTS SET UP
IN THE COUNCIL DIRECTIVE ON THE APPROXIMATION OF THE LAW OF
MEMBER STATES RELATING TO ELECTROMAGNETIC COMPATIBILITY
(89/336/EEC) AND LOW VOLTAGE DIRECTIVE 78/28/EEC. FOR THE
EVALUATION REGARDING THE ELECTROMAGNETIC COMPATIBILITY
AND SAFETY, THE FOLLOWING STANDARDS WERE APPLIED:
* EN50081-1 (1992) : GENERIC EMISSION STANDARDS
EN550022 (1994) : EMISSION
EN60555-2 (1987) : HARMONICS
EN60555-3 (1987) : VOLTAGE FLUCTUATIONS
* EN50082-1 (1992) : GENERIC IMMUNITY STANDARD
IEC 801-2 (1984) : ELECTROSTATIC DISCHARGE IMMUNITY
IEC 801-3 (1984) : RADIATED IMMUNITY
IEC 801-4 (1988) : ELECTRICAL FAST TRANSIENT
The manufacturer also declares the conformity of above mentioned product with the
actual required safety standards in accordance with LVD 73/23 EEC.
Manufacturer/Importer
Date: Nov 16, 1997
Signature: Signature:
Name: JEFF CHANG Name: KUNNAU CHEN
(Project Leader) (President)
EP-PT21 User’s Manual
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EP-PT21
Motherboard
for
Compatible PC
User Manual Rev 1.3
Related Motherboard: EP-PT21 P.C.B. Rev 2.1
Date: Nov. 1997
EP-PT21 User’s Manual i
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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 installation. 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
interference 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
graphics card is required to assure compliance with FCC regulations.
Changes or modifications 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 the Radio Interference Regulations
for the Canadian Department of Communications.
EP-PT21 User’s Manual
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Table Of Contents
1. INTRODUCTION.........................................................................................IV
1.1 ABOUT THIS MANUAL........................................................................IV
1.2 ITEM CHECKLIST.................................................................................V
1.3 SPECIFICATIONS...................................................................................1
1.4 NOTES ON INSTALLATION...................................................................1
2. INSTALLATION.............................................................................................1
2.1 MOTHERBOARD LAYOUT.....................................................................1
2.2 INSTALLATION STEPS...........................................................................2
2.3 SYSTEM MEMORY................................................................................2
2.4 CENTRAL PROCESSING UNIT (CPU)....................................................3
2.4.1 Installing the CPU.....................................................................3
2.4.2 Setting CPU Speed with ”Easy-Jumpers”.................................4
2.5 EXTERNAL CONNECTORS.....................................................................6
2.5.1 PS/2 Keyboard Connector and USB Port.................................6
2.5.2 Parallel Printer Port (CON2, 25-pin Female)..........................6
2.5.3 Serial Ports (COM1, COM2, 9-pin Male Connector)...............7
2.5.4 AT & ATX Power Supply Connectors........................................7
2.5.5 Floppy Drive Connector (J9, 34-pin block)..............................8
2.5.6 Primary/Secondary IDE connectors. (J6 & J7: 40-pin blocks) 8
2.5.7 IDE Activity LED (J22, pins 2-4)..............................................9
2.5.8 Front Panel Connector..............................................................9
2.5.9 CPU Cooling Fan Connector (J5)..........................................12
2.5.10 IrDA Connector (J21: Front IR; J10: Rear IR)....................13
2.5.11 External Battery Connector (J1)...........................................13
2.5.12 Clear CMOS Connector (J4).................................................14
EP-PT21 User’s Manual i
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1. Introduction
1.1 About this Manual
This manual is arranged to help you set up and run this Pentium
MMX™ Motherboard as quickly as possible.
Information is presented in the following two chapters:
Chapter 1.
Introduction: This chapter presents the features of the motherboard;
what components and accessories should be included with it;
and describes the specifications of this product, including a
diagram of the motherboard layout.
Chapter 2.
Installation: This chapter shows how to install the motherboard, and
how to configure its various features and functions.
EP-PT21 User’s Manual
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1.2 Item Checklist
This product comes with the following components:
Motherboard x 1
40-pin IDE connector flat cable x 1
34-pin floppy disk drive flat cable x 1
User's manual x 1
Flash ROM utility & Bus master IDE driver diskette (Optional)
Rear panel shielding (Optional)
IrDA module (Optional)
EP-PT21 User’s Manual i
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1.3 Specifications
Processor:
ZIF socket 7 support intel® Pentium MMX™; intel® P54C,
P55C Series, Cyrix 6x86/M2 Series, and AMD K5/K6 Series.
Supports current and future CPUs.
Chipset:
intel® 82430TX System Controller; intel® 82371AB PCI/ISA
IDE Accelerator.
BIOS:
Award/AMI BIOS support DMI; Flash ROM with Green PC,
Plug-and-Play, ACPI, and PC97
System Memory:
Four 72-pin SIMMs and two 168-pin DIMM Slots support up
to 256MB. The system supports mixed memory technologies:
Extended Data Out (EDO) RAM, Fast Page (FP) DRAM, and
SDRAM (Synchronous DRAM).
On-board Multi-I/O:
1 x FDD Port supports up to 2.88MB
1 x Parallel Port (LPT) support ECP/EPP
2 x High Speed Serial (16550 UART) Ports
2 x Universal Serial Bus (USB) Ports
1 x PS/2 Keyboard Port
1 x PS/2 Mouse Port
1 x Real Time Clock (RTC)
2 x IrDA ports
Cache Onboard:
512KB Pipeline Burst SRAM Cache
EP-PT21 User’s Manual i
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PCI Bus Master IDE:
2 x PCI Bus Master IDE Controllers
Support PIO Mode 3/4 EIDE Devices (HDD, CD-ROM, LS120 FDD, etc.);
Ultra DMA/33 mode; and HDD Auto-Detect
Expansion Slots:
4 x 32-bit PCI Bus Master Slots, 3 x 16-bit ISA Slots
Options:
Infrared (IrDA) Wireless Interface Kit
LM75 CPU Temperature Gauge
LM78 Hardware Monitor Chip
Dimensions:
210mm x 305mm
Form Factor:
ATX Form Factor
EP-PT21 User’s Manual i
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1.4 Notes On Installation
This motherboard has been designed with the Intel 82430TX, PCI
chipset, which was developed by Intel Corporation to fully support
the Pentium Processor PCI/ISA system. The Intel 82430TX PCI
chipset provides increased integration and improved performance.
The chipset provides an integrated IDE controller with two high
performance IDE interfaces, for up to four IDE devices (hard devices,
CD-ROM device, etc). The Super I/O controller provides standard
I/O functions: floppy interface, two serial ports with 16-Byte FIFO
buffers, and an EPP/ECP-capable parallel port.
Care must be taken when inserting memory modules, inserting the
CPU, or even plugging PCI cards into associated slots to avoid
damaging any circuits or sockets on the motherboard. A cooling fan
is strongly recommended when installing P54C, P54CTB, P55C, K5,
K6, 6x86, or M2 CPU, to avoid overheating.
The motherboard requires a minimum of 8MB of system memory,
and can support a maximum of 256MB.
The onboard L2 Cache comprises 256KB or 512KB of static RAM
(SRAM) to increase system performance.
The motherboard supports standard Fast Page (FP), EDO (Extended
Data Out), or SDRAM (Synchronous DRAM) memory, and provides
four 72-pin SIMMs and two 168-pin DIMMs. The sockets support
1Mx32(32MB) single-sided or double-sided memory modules.
Memory timing requires 70ns Fast Page devices or 60ns EDO RAM.
Memory parity generation and checking is not supported. (DRAM
Modules may be parity (x36) or non-parity (x32).
The board also has two onboard PCI IDE connectors, and detects the
IDE hard disk type through an automatic BIOS utility. The system
also supports Award Plug & Play BIOS for the ISA and PCI cards.
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2. Installation
2. Installation
2.1 Motherboard Layout
EP-PT21 User’s Manual i
Intel 430TX Chipset
CPU type select
Intel 430TX Chipset
512KB Cache
CPU speed select
LM75 CPU temp. sensor
ZIF CPU socket
Switching voltage regulator
Two 168-pin
DIMM sockets
Four 72-pin SIMM
sockets
Rear IrDA port
COM1 serial port
Parallel port
COM2 serial port
PS/2 Keybd/Mouse
AT power connector
ATX power connector
USB serial port
Front panel jumper
Clear CMOS jumper
DIMM
voltage select
FDD Connector
Primary IDE
Secondary IDE
Three ISA slots
External battery
connector
LM78 hardware
monitor
Super I/O chipset
Lithium battery
Super I/O Chipset
Four PCI slots
Fan connector
Front IrDA port
Award BIOS
Program Connector
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2. Installation
2.2 Installation Steps
1. Set jumpers on the motherboard
2. Install DRAM (and SDRAM) memory modules
3. Install the CPU
4. Install Expansion Card(s)
5. Install the External Connectors
2.3 System Memory
This motherboard supports four 72-pin SIMMs (Single Inline
Memory Modules) of 4MB, 8MB, 16MB, 32MB, and/or 64MB to
form a memory size between 8MB to 256MB. The DRAM can be
either 60ns or 70ns Fast Page Mode (FPM, Asymmetric or
Symmetric), Extended Data Output (EDO). SIMMs must be installed
in pairs so that each bank contains two of the same size memory
modules.
Install memory in any or all of the banks at any combination as shown
in the table below:
EP-PT21 User’s Manual
SDRAM voltage
select (3.3v/5v)
SIMM 4
SIMM 3
SIMM 2
DIMM 1
DIMM 2
SIMM 1
2
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2. Installation
Item Bank Memory Module
1 DIMM 1 8-128MB
2 DIMM 1, 2 8-128MB
3 DIMM 2
SIMM 3, 4
8-128MB
4-64MB
4 DIMM 1
SIMM 1, 2
8-128MB
4-64MB
5 SIMM 1, 2 4-64MB
6 SIMM 3, 4 4-64MB
7 SIMM 1, 2, 3, 4 4-64MB
NOTE: You cannot mix two types (FPM, EDO, or SDRAM) or sizes
of memory in a single bank. After installing any memory modules,
setup is required using "Auto Configuration" in the Chipset Features
section of BIOS setup.
2.4 Central Processing Unit (CPU)
The motherboard provides a 321-pin ZIF Socket 7. The CPU should
have a fan attached to it to prevent overheating. If the CPU did not
come with a fan then purchase a fan before you turn on your system.
Apply thermal jelly to the CPU top and then install the fan onto the
CPU.
NOTE: Without a fan, the CPU can overheat and cause damage to
both the CPU and the motherboard
2.4.1 Installing the CPU
To install a CPU, locate the ZIF socket and open it by first pulling the
lever sideways away from the socket's "Lock" then upwards to a 90degree angle. Insert the CPU with the correct orientation as shown.
Look to see that the pins are denser on one half compared to the other
half. You should have a CPU fan that will cover the face of the CPU.
With the added weight of the CPU fan, no force is required to insert
EP-PT21 User’s Manual i
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2. Installation
the CPU. Once completely inserted, hold down the fan and close the
socket's lever.
2.4.2 Setting CPU Speed with ”Easy-Jumpers”
The Easy-Jumpers system greatly simplifies the task of setting the
proper CPU type and speed. All the information you need is clearly
marked right on the motherboard.
First, set the CPU type (P54C, MMX, K5, ... etc.) with one jumper
cap on the J25 pin block.
Next, set the bus speed. The default value (with no jumpers added) is
66Mhz. If you need to use 75MHz or 83.3MHz, then place a jumper
cap over the appropriate pins on block J24. Pins 17-18 set 75MHz;
and pins 19-20 set 83.3MHz.
Finally, set the CPU speed as a multiple of the bus speed on J24.
Note that there are two captions next to each pair of pins in J24. The
first one is a multiplication factor, such as 2.0”; and the second is a
CPU speed based on the default bus speed of 66MHz.
Thus, if you set a bus speed other than the default, you should pay
attention only to the multiplication factor and NOT the pre-printed
CPU speeds.
For example, suppose you have a Pentium-150 CPU, and you wish to
run with a bus speed of 75MHz. You would place three jumper caps,
as follows:
EP-PT21 User’s Manual
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
J25, CPU Type
J24, Clock
Speed
4
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2. Installation
J25, pins 1-2 (P54C) J24, pins 21-22 (X75)
pins 3-4 (x2.0)
133
166
200
233
266
300
330
100
X83.3
X75
This would give you a bus speed of 75MHz, and a CPU speed of
150MHz.
Note: although the caption next to the jumper in this example reads
x2.0 | 133, the actual speed is 75MHz X 2.0, or 150MHz.
EP-PT21 User’s Manual i
Sets CPU type to P54C
Selects 75MHz bus
Sets CPU speed to
2.0X bus speed
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2. Installation
2.5 External Connectors
NOTE: Please refer to the diagram on page 1 and to the markings on
the motherboard to be sure that connectors and jumper caps are placed
correctly. Placing jumper caps on connector pin-blocks can cause
damage to your motherboard.
2.5.1 PS/2 Keyboard/Mouse Connector and USB Port
(J17, 2x 6-pin Female and J16, 6-pin Female)
2.5.2 Parallel Printer Port (J14, 25-pin Female)
You can enable or disable the parallel port (LPT1) and choose its IRQ
number in the BIOS setup.
2.5.3
EP-PT21 User’s Manual
J16 : USB Connector
J17 : Keyboard/Mouse Connector
J14 : Parallel
Port
(Support Standard
USB Specification)
6
Page 17
2. Installation
2.5.4 Serial Ports (COM1, COM2, 9-pin Male Connector)
The two serial ports (COM1 & COM2) can be used for pointing
devices or other serial devices. See Onboard Serial Port in Chipset
Features Setup in the BIOS setup software to configure.
2.5.5 AT & ATX Power Supply Connectors
J23 is a standard 12-pin AT-type or PS/2 type socket. Be sure to
attach the two connectors with the four black wires next to each other,
at the centre. J12 is a standard ATX-type power connector. (The
ATX power connector can only be inserted the correct way.)
EP-PT21 User’s Manual i
COM1 Port
J23 :
AT Power
Connector
J12 :
ATX Power
Connector
Keyhold
J15 :
COM2 Port
J11 :
Black Wires
at Center
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2. Installation
2.5.6 Floppy Drive Connector (J9, 34-pin block)
The motherboard provides a standard floppy disk driver (FDD)
connector that supports 360K, 720K, 1.2M, 1.44M and 2.88M floppy
disk types. You can attach a floppy disk cable directly to this
connector.
2.5.7 Primary/Secondary IDE connectors. (J6 & J7: 40-pin blocks)
These connectors support the provided IDE hard disk ribbon cable.
After connecting the single end to the board, connect the plug(s) at the
other end to your hard disk drive(s). If you install two hard disks, you
must configure the second drive to slave mode by setting its jumper
accordingly. Please refer to your hard disk documentation for the
jumper settings. The BIOS now supports SCSI device or IDE CDROM boot-up (see "Boot Sequence" in the BIOS Features Setup of
the BIOS Software)
EP-PT21 User’s Manual
FDD Connector
Pin #1
Primary IDE
Secondary IDE
Pin #1
Pin #1
Primary
IDE
8
Secondary
IDE
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2. Installation
2.5.8
EP-PT21 User’s Manual i
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2. Installation
2.5.9 IDE Activity LED (J22, pins 2-4)
These pins connect to the IDE (hard disk) activity indicator light on
the system cabinet.
2.5.10 Front Panel Connector
2.5.10.1 System Power LED (J22, pins 9/11-13)
This 2-pin connector lights the system power LED when the
motherboard has power
EP-PT21 User’s Manual
J22
J22
HDD LED
(pins 2-4)
pins 11-13, for
2-pin connector
pins 9-13, for
3-pin connector
10
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2. Installation
2.5.10.2 SMI Suspend Switch & ATX Power Switch (J22, pins 10-12)
Marked as ”PS-ON” on the motherboard, this switch supports
different modes of operation, in conjunction with a standard ATXtype power supply.
A push-button switch connected to this lead controls the system
power. Pushing the button once will turn on the system and pushing
another time will turn it off. The system power LED shows the
system's on/off power status. If Power Management is enabled under
BIOS setup, this allows the user to manually place the system into a
suspend mode (often called “green mode”) where system activity will
be instantly decreased to save electricity and prolong the life of
certain components when the system is not in use. In this case, the
user must press and hold the Power Switch for a preset delay period
to turn the system power off completely. The delay and other Power
Management parameters are determined in BIOS Setup.
This connection does not have a function when a standard power
supply is used
NOTE: If the power to the ATX power supply is interrupted while
the motherboard is on, standby power will remember that the
motherboard should be on and boot the computer when power is
reapplied to the ATX power supply.
EP-PT21 User’s Manual i
J22
PS ON
(pins 10-12)
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2. Installation
2.5.10.3 Turbo LED (J22, pins 6-8)
This 2-pin connector connects to the case-mounted Turbo LED.
2.5.10.4 Reset Switch Lead (J22, pins 18-20)
This 2-pin connector connects to the case-mounted reset switch for
rebooting your computer without having to turn off power switch.
This method of cold-booting is preferred in order to prolong the life of
the system's power supply.
EP-PT21 User’s Manual
J22
J22
pins 6-8
Turbo LED
RESET
(pins 18-20)
12
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2. Installation
2.5.10.5 Speaker Connector (J22, pins 1-7)
This 4-pin connector connects to the case-mounted speaker.
2.5.11 CPU Cooling Fan Connector (J5)
This connector supports a CPU cooling fan of 500mAMP (6WATT)
or less. Orient the fan so that the heat sink fins allow airflow to go
across the onboard heat sink(s) instead of the expansion slots.
Depending on the fan manufacturer, the wiring and plug maybe
different. The red wire should be positive, while the black should be
ground. Connect the fan's plug to the board taking into consideration
the polarity of the connector.
NOTE: The CPU and/or motherboard will overheat if there is no
airflow across the CPU and onboard heatsinks. Damage may occur to
the motherboard and/or the CPU if these pins are incorrectly used.
These are not jumpers. Do not place jumper caps over these pins!
EP-PT21 User’s Manual i
J22
J5 : “FAN”
SPEAKER
(pins 1-9)
Pin #1
Pin 3 :GND
2 : +12V
1 : Det.
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2. Installation
2.5.12 IrDA Connector (J21: Front IR; J10: Rear IR)
These connectors support optional wireless infrared transmit/receive
modules. The IrDA module mounts to a small opening on the system
cabinet. To use this feature, you must also configure UART2. to ”set
Infrared” under Chipset Features in the BIOS Setup to select whether
UART2 is directed for use with COM2 or IrDA. When IrDA is
selected in BIOS, COM2 will be disabled. Use the six pins as shown
on the Back View and connect a ribbon cable from the module to the
motherboard to the pin definitions.
2.5.13 External Battery Connector (J1)
When using the external battery connector, be very careful of the
polarity (positive and negative poles). Also, be sure to use only
batteries rated at 4.5~6.0V.
EP-PT21 User’s Manual
1 5V
J21 FRONT
IR
J10 REAR IR
J1 EXT BATTERY
Pin #4
(positive)
Pin #1
Pin #1
Pin #1
-
Pin 6 NC
5 IRTX
4 GND
3 IRRXL
2 IRRXH
14
Page 25
2. Installation
2.5.14 Clear CMOS Connector (J4)
Temporarily placing a jumper across pins 1-2 of this pin block will
erase all user-defined BIOS setting. Be certain that system power is
OFF before using this feature!
(Default fix to Normal)
EP-PT21 User’s Manual i
J4 : CLEAR CMOS
Pin #1
Normal
Clear CMOS
Page 26
EP-PT21
User’s Manual
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