Abit IT5 Series User manual

Part Number:MN-090-B41-91 Rev:1.04
Table of Contents
Chapter 1 Introduction of IT5 Series Features
¬IT5V.....................................................................................1-2
lSpecifications ....................................................................1-2
lLayout diagram.................................................................1-4
lSystem block diagram.......................................................1-5
-IT5H.....................................................................................1-6
lSpecifications ....................................................................1-6
lLayout diagram.................................................................1-8
lSystem block diagram.......................................................1-9
Chapter 2 Installing the Mainboard
¬Standard External Connectors................................................2-3
-Jumpers and Switches..........................................................2-10
®Presentation and Installation of the CPU...............................2-11
¯Installing Pipeline Burst SRAM.............................................2-14
°Installing System Memory 【DRAM Memory】................2-15
Chapter 3 Introduction to BIOS
¬CPU setup 【CPU SOFT MENU™】................................3-4
-Standard CMOS Setup Menu..............................................3-10
®BIOS Features Setup Menu.................................................3-12
¯Chipset Features Setup Menu...............................................3-18
°Power Management Setup Menu..........................................3-20
±PCI & Onboard I/O Setup...................................................3-24
²Load BIOS Defaults ............................................................3-30
³Load Setup Defaults.............................................................3-30
´Password Setting .................................................................3-31
µIDE HDD Auto Detection....................................................3-32

Appendix A Quick Installation
Appendix B Intel Pentium CPUs
Appendix C AMD-K5 CPUs
Appendix D Cyrix 6x86 CPUs
Appendix E General Discussion about HDD Installation
Appendix F Technical Support
Appendix G Flash BIOS User Instructions

Introduction of IT5 Series Features 1-1
Chapter 1 Introduction of IT5
Series Features
The IT5 series has been especially designed for File server, Workstation
and Professional users. It can support a wide range of processors, including all
Intel CPUs (P54C) and Intel CPUs with MMX (P55C), as well as all
AMD-K5 and Cyrix 6x86/6x86L CPUs. It also takes into account, as much as
possible, all future CPUs.
This series uses SOFT MENU™ technology, which means that all the
parameters can be configured without using DIP switches or jumpers. The
configuration is entirely achieved through a “Soft Switch” that allows the user to
set CPU speed and operating voltage with ease.
The IT5 series uses Intel 430VX and 430HX series chipsets, and has
256K or 512K Level-2 Pipeline Burst SRAM on board. It also provides an
extension slot allowing the user to upgrade Pipeline Burst SRAM to 512K.
Two 168-pin DIMM slots and four 72-pin SIMM slots meet the
requirements for all memory configurations required by high level computing.
The 168-pin DIMM slots support traditional Fast Page and EDO DRAM as a
memory standard for next generation 64-bit systems. The two 168-pin
DIMM slots have been reserved to meet requirements for both present and
future upgrades.
This series also provides two Universal Serial Bus (USB) ports and meets
the Concurrent PCI Rev. 2.1 standard. It also supports IDE interface for Fast
HDD (Mode 0~4), as well as IDE Bus Master. These features also meet
present and future interface standards and needs.
System BIOS features include Plug-and-Play (PnP), Advanced Power
Management (APM), the newest Desktop Management Interface (DMI), as
well as IT5’s unique CPU operating frequency and voltage setup feature in
order to meet modern computing demands.

1-2 Chapter 1
¬IT5V
lSpecifications:
1. CPU frequency and voltage setup with CPU “SOFT MENU™”
lSetup of the mainboard’s frequency and voltage without DIP
Switches or Jumpers.
lModification of CPU operating voltage and frequency through
software configuration.
lModification of CPU operating voltage and frequency directly on
screen.
2. Uses ZIF CPU Socket 7 for easy CPU installation
lThree voltage regulator/cooling plate sets for a more stable
CPU operating environment
lSupports Intel Pentium®CPUs: 75MHz to 200MHz and P55C
CPUs with MMX
lSupports all AMD sixth generation AMD-K5™CPUs: 75MHz
to 166MHz, AMD-K6™ CPUs: 200MHz and 233MHz
lSupports all Cyrix sixth generation 6x86™ CPUs: P120+, P133+,
P150+, P166+
lReserved circuitry supports future sixth generation CPUs
3. Chipset
lIntel 430VX chipset
lSupports standard version PCI 2.1
4. L2 Cache Memory
l256K or 512K of cache memory (Pipeline Burst SRAM)
lCache memory upgradeable to 512K
5. System DRAM
lFour 72-pin SIMM sockets: support FP and EDO DRAM
lTwo 168-pin DIMM sockets: support FP, EDO and Synchronous
DRAM (SDRAM)
lDIMM sockets use PC modules (3.3V Unbuffered DRAM)
lUp to 128MB memory configuration possible

Introduction of IT5 Series Features 1-3
6. System BIOS
lAWARD BIOS
lSupports Plug-and-Play (PnP)
lSupports Advanced Power Management (APM)
lSupports Desktop Management Interface (DMI)
7. Multi I/O features
lTwo Universal Serial Bus (USB) ports
lFour fast IDE channels (PIO mode 0~4 and Bus Master)
lOne EPP/ECP parallel port and one 16550 serial port
lTwo floppy disk drive connectors (FDD) (360K, 720K, 1.2M,
1.44M and 2.88M)
8. Other features
lStandard AT architecture dimensions
lFour ISA bus slots and four PCI bus slots
lSupports 3-MODE for a special Japanese floppy disk drive
lSupports two bootable hard disks--able to run two different
operating systems
Note: All brand names and trademarks are the property of their respective owners.

1-4 Chapter 1
lLayout diagram
Fig 1-1 Layout diagram

Introduction of IT5 Series Features 1-5
lSystem block diagram
Fig. 1-2 System block diagram
PentiumProcessor
3.3V
Host BUS
Control
Address
Data
Second Level
Cache
Addr
Ctrl
Tag Ctrl Data
Ctrl
TIO[0..7]
PCI BUS TXD Ctrl
Plink
Control
Address/Data
Fast
IDE
ISA BUS
Universal Serial Bus
TDX
Main
Memory
(DRAM)
CACHE
(SRAM)
TAG
TVX
PIIX3
CD ROM &
Hard Disk
USB
1
USB
2
PCI Device(s)
ALi
M5123
ISA Device(s)
Serial
LPT
FDC

1-6 Chapter 1
-IT5H
lSpecifications:
1. CPU frequency and voltage configuration with CPU “SOFT
MENU™”
lSetup of the mainboard’s frequency and voltage without DIP
Switches or Jumpers.
lModification of CPU operating voltage and frequency through
software configuration.
lModification of CPU operating voltage and frequency directly on
screen.
2. Uses ZIF CPU Socket 7 for easy CPU installation
lThree voltage regulator/cooling plate sets for a more stable
CPU operating environment
lSupports Intel Pentium®CPUs: 75MHz to 200MHz and P55C
CPUs with MMX
lSupports all AMD sixth generation AMD-K5™CPUs: 75MHz to
166MHz, AMD-K6™CPUs: 200MHz and 233MHz
lSupports all Cyrix sixth generation 6x86™ CPUs: P120+, P133+,
P150+, P166+
lReserved circuitry supports future sixth generation CPUs
3. Chipset
lIntel 430 HX chipset
lSupports standard version PCI 2.1
4. L2 Cache Memory
l256K or 512K of cache memory (Pipeline Burst SRAM)
lCache memory upgradeable to 512K
5. System DRAM
lFour 72-pin SIMM sockets: support FP and EDO DRAM
lTwo 168-pin DIMM sockets: support FP, EDO
lDIMM sockets use PC modules (3.3V Unbuffered DRAM)
lSupports error check and correction (ECC) function
lUp to 512MB memory configuration possible

Introduction of IT5 Series Features 1-7
6. System BIOS
lAWARD BIOS
lSupports Plug-and-Play (PnP)
lSupports Advanced Power Management (APM)
lSupports Desktop Management Interface (DMI)
7. Multi I/O features
lTwo Universal Serial Bus (USB) ports
lFour fast IDE channels (PIO mode 0~4 and Bus Master)
lOne EPP/ECP parallel port and one 16550 serial port
lTwo floppy disk drive connectors (FDD) (360K, 720K, 1.2M,
1.44M and 2.88M)
8. Other features
lStandard AT architecture dimensions
lFour ISA bus slots and four PCI bus slots
lSupports 3-MODE for a special Japanese floppy disk drive
lSupports two bootable hard disks--able to run two different
operating systems
Note: All brand names and trademarks are the property of their respective owners.

1-8 Chapter 1
lLayout diagram
Fig. 1-3 Layout diagram

Introduction of IT5 Series Features 1-9
lSystem block diagram
PentiumProcessor
3.3V
Control
Address
Host BUS
Second Level
Cache
Data
Addr
Ctrl
Ctrl
Tag Ctrl
ECC
TIO[0..7]
TIO[8..10]
Data
PCI BUS Control
Address/Data
Fast
IDE
Universal Serial Bus
ISA BUS
USB
1
USB
2
Main
Memory
(DRAM)
CACHE
(SRAM)
TAG
TXC
PIIX3
CD ROM &
Hard Disk
PCI Device(s)
ISA Device(s)
ALi
M5123
Serial
LPT
FDC

1-10 Chapter 1
Fig. 1-4 System block diagram

Introduction of IT5 Series Features 1-11

Installing the Mainboard 2-1
Chapter 2 Installing the
Mainboard
This mainboard series not only provides all standard equipment for classic
personal computers, but also provides great flexibility for meeting future upgrade
demands. This chapter will introduce step by step all the standard equipment
and will also present, as completely as possible future upgrade capabilities.
This mainboard is able to support all Intel Pentium including P55C with MMX,
Cyrix 6x86, 6x86L and AMD-K5 processors now on the market. (For details,
see specifications in Chapter 1.) However, we cannot guarantee that the
description given in this manual on the circuitry of your mainboard will work for
processors not listed in Chapter 1. For example, the operating voltage of
Cyrix’s next generation CPUs is unknown at the present time. Thus we were
not able to include these specifications in your motherboard. We will supply
further information about CPU support when new CPUs arrive on the market.
This chapter is organized according the following features:
ŒStandard external connectors
•Jumpers and switches
ŽInstalling the CPU--steps for installing Intel, Cyrix and AMD
processors.
•Installing cache memory--If you don’t want to upgrade the cache
memory you can skip this chapter.
•Installing the system memory.
NNNN
Before proceeding with the installation
Before installing the mainboard please be sure to turn off or disconnect the
power supply unit. Before making any modifications to the hardware
configuration of the mainboard, the power supply to any areas of the mainboard
you plan to modify should be turned off to avoid unnecessary damage to the
hardware.

2-2Chapter 2
&
User friendly instructions
Our objective is to enable the novice computer user to perform the
installation by themselves. We have attempted to write this document in a very
clear, concise and descriptive manner to help overcome any obstacles you may
face during installation. Please read our instructions carefully and follow them
carefully step-by-step.

Installing the Mainboard 2-3
¬Standard External Connectors
Inside the case of any computer several cables and plugs have to be
connected. These cables and plugs are usually connected one-by-one to
connectors located on the mainboard. You need to carefully pay attention to
any connection orientation the cables may have and, if any, notice the position of
the first pin of the connector. In the explanations that follow, we will describe
the significance of the first pin.
PN1 -Keylock connectorPlease pay attention to pin position and
orientation
This connector has a specific orientation. Connect the five-thread keylock
connector cable to the PN1 connector pins on the mainboard.
Pin number Name or significance of signal
1+5VDC
2No connection
3Ground
4Keyboard inhibit Signal
5Ground

2-4Chapter 2
The “keylock switch”is used to lock the computer’s
keyboard. This disables the keyboard so that unauthorized
persons cannot use it. When this function is in use, you will
need to use the unlock key to activate the keyboard.
PN1 -IDE LED connector
This connector has a specific orientation. Connect the two-thread IDE LED
connector cable attached to the case to the IDE LED connector on the
mainboard.
Pin number Name or significance of signal
7LED’s Cathode
8LED’s Anode
PN1 -Standby connector
There is no specific orientation. Most of the present AT cases do not support
this feature so most of you can ignore this instruction. If your case has a cable
for the Standby feature, you should connect this cable to the connector on the
Mainboard.
Pin number Name or significance of signal
10 Standby power supply【+5VSB】
11 Control signal of computer switch of the case
The “standby connector,”unlike the traditional mechanical
switch, is an electronic way to turn the computer’s power off.
To use this feature, the power supply system must permit a
shutdown power supply (+5VSB), support the electronic
switch feature, and must also be used with connector JS1 on
the mainboard. For example, when using Windows 95,
your computer will automatically shut down after having saved
your work when you exit Windows. You do not need to
use the mechanical switch to turn the computer off.
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Installing the Mainboard 2-5
PN1 -Hardware Suspend switch
There is no specific orientation. Connect the two-thread hardware suspend
plug to the PN1 connector pins on the mainboard. Since most cases do not
support this feature, most of you ignore this instruction. Furthermore, this
feature is not necessary as it is already a part of the mainboard.
Pin number Name or significance of the signal
13 Suspend
14 Ground
PN2 -Hardware Reset connector
There is no specific orientation. Connect the two-thread hardware reset cable
to the PN2 connector pins on the mainboard.
Pin number Name or significance of signal
1Ground
2Hardware reset signal
The “Hardware Reset”is used to reset the computer during
operation without turning the computer off and back on.
For example, if you are running an application that stops
responding to the computer, you may press the Reset button
to restart the computer.
PN2 -Speaker connector
There is no specific orientation. Connect the four-thread speaker cable to the
PN2 connector pins on the mainboard.
Pin number Name or significance of signal
4+5VDC
5Ground
6Ground
7Sound Signal
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2-6Chapter 2
PN2 -Turbo switch LED connector
This connector has a specific orientation. Connect the two-thread turbo switch
LED plug to the PN2 connector pins on the mainboard.
Pin number Name or significance of signal
9Anode terminal of Turbo LED
10 Cathode terminal of Turbo LED
The “hardware Turbo LED”indicates the status of hardware
operating speed.
JS1 -Power Control connector
This has a specific orientation. The present power supply units of AT computer
do not support this feature, so you can ignore this connector. If your power
supply unit features this connector, insert plug JS1, but be sure that the
signification of the signal cable is the same, and be sure to use this feature in
connection with the Standby connector on connector PN1.
Pin number Name of the signal or signification
1Power supply control signal 【PS_ON】
2Standby power supply 【+5VSB】
3Ground
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