EPOX P55-BT User Manual

82430TX PCIset

P55-BT

ISA PCI

with Onboard PCI IDE and Super Multi-I/O.

TRADEMARK

All products and company names are
trademarks or registered trademarks of
their respective holders.

The specification is subject to change without notice.

MainBoard

V043

Package Checklist

Please make sure your package containg all items listed below before
your installation. If you find any damaged items or missing items,
please contact your retailer.

One Mainboard
One manual
One IDE ribbon cable
One floppy ribbon cable

Contents

page

Chapter 1 - Introduction................................................... 1-1

System Block Diagram ............................................. 1-3

P55-BT Layout ........................................................ 1-4

Chapter 2 - Hardware Design ......................................... 2-1

2-1 Overview ..................................................................2-1

2-2 Connectors and Jumpers............................................2-3

2-3 Real Time Clock Battey Replacement ..........................2-7

2-4 System Memory Configuration ...................................2-8

2-5 Cache Memory Configuration ....................................2-9

2-6 Integrated PCI Bridge .................................................2-10

Chapter 3 - ATX Power Connector

3-1 External Madem Ring-in Power-On and Keyboard Power

on Functions................................................. 3-2

Chapter 4 - Award BIOS Setup........................................ 4-1

4-1 Standard CMOS Setup ...............................................4-2

4-2 BIOS Features Setup ..................................................4-2

4-3 Chipset Features Setup...............................................4-6

4-4 Power Management Setup ..........................................4-8

4-5 Plug & Play/PCI Configuration....................................4-11

4-6 Integrated Peripherals.................................................4-14

4-7 Load Setup Defaults ...................................................4-16

4-8 Change Supervisor or User Password .........................4-17

4-9 IDE HDD Auto Detection ...........................................4-18

4-10 HDD Low Level Format ..............................................4-20

4-11 Save & Exit Setup .......................................................4-20

4-12 Exit Without Saving ....................................................4-20

Chapter 5 - Technical Information....................................5-1

5-1 I/O & Memory Map ....................................................5-1

5-2 Time & DMA Channels Map ......................................5-2

5-3 Interrupt Map.............................................................5-2

5-4 RTC & CMOS RAM Map ...........................................5-3

Appendix A: POST Codes...................................................................5-4

Appendix B: I/O Connectors...............................................................5-8

NOTE :

The "LOAD SETUP DEFAULTS" function loads the system default data directly from
ROM and initializes the associated hardware properly. This function is necessary when
you accept this Mainboard, or the system CMOS data is corrupted.

ROM PCI/ISA BIOS

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP SUPERVISOR PASSWORD
BIOS FEATURES SETUP USER PASSWORD
CHIPSET FEATURES SETUP IDE HDD AUTO DETECTION
POWER MANAGEMENT SETUP HDD LOW LEVEL FORMAT
PNP/PCI CONFIGURA ETUP
INTEGRATED PERIPH SAVING

LOAD SETUP DEFAULTS

ESC: QUIT :SELECT ITEM
F10:Save & Exit Setup (Shift)F2 :Change Color

Load Setup Defaults Except Standard COMS SETUP

Load SETUP Default (Y/N)? Y

LOAD SETUP DEFAULT

The P55-BT mainboard is a high performance system hardware based on

Intel Pentium processor and is equipped with four PCI slots, four standard
ISA slots, a PnP Super I/O controller and two dual-port PCI-IDE connectors
for the future expansion. The hardware dimension is an AT form-factor that is
220mm x 260mm with a four-layer design technology.

Specification

Intel 82430TX PCIset chipset.
Intel Pentium Processor operating at 100 ~ 333 MHz (Easy CPU CLK

Setting JP4 : One Jumper Only) and P55C with 321 ZIF socket 7 for
scalability to accept faster processors in the future.

Supports an onboard Switching Voltage Regulator to increase CPU and
System's reliability.

Supports CPU Vcore Voltage 2.0V/2.8V/2.9V/3.2V selection.
Supports up to 256 MegaBytes of DRAM(a minimum of 8 MB) on board(72-

Pin SIMM x 2, 168-Pin DIMM x 2), BIOS auto FP DRAM, EDO DRAM and
SDRAM configuration.(Refer to Chapter 2-4 System Memory Configuration)

Introduction 1-1

Chapter 1

Introduction

R

R

Supports Onboard Burst/Pipelined burst synchronous L2 Write Back
Cache. The cache memory is 512KB (64KB*32 SRAM).

Supports four 16-bit ISA slots and four 32-bit PCI slots and provides two
independent high performance PCI IDE interfaces capable of supporting PIO
Mode 3 and Mode 4 devices.

Supports ATAPI (e.g. CD-ROM) devices and Ultra DMA 33 for both IDE
interface.

Supports 1 floppy port, 1 parallel port (EPP,ECP port), and 2 serial ports
(16550 Fast UART compatible) with PnP Super I/O chip.

Supports both PS/2 style mouse and PS/2 style AT keyboard connectors
Supports Award Plug & Play BIOS . The BIOS is stored in Flash EPROM

form. It provides better upgradeability for the system.
Supports a CPU Hardware sleep and SMM (System Management Mode)

function.
Supports a PWR/ON connector with an ATX power supply for a Remote ON/

OFF controller, a Ring-in (External Modem only) Power-On and a Keyboard
Power-on function.

1-2 P55-BT

Supports a USB connector
Utilizes a Lithium battery which provides environmental protection and

longer life-time
Supports a CPU temperature alarm so that when CPU's cooling fan is malfunction

or CPU overheats, CPU automatically slow down.
Supports a dual-button configuration which consists of POWER button for Off/

On transitions and SLEEP button for Sleep/Wake transitions. The configuration
is for ACPI-defined 4-second override feature of the SLEEP button. When the
user presses the power button for less than 4 seconds, the system enters into
sleep mode. When the user presses the power button for more than 4 seconds,
the system is powered off.

Supports onboard ATX and AT power connectors.

Introduction 1-3

PCI Slots

>

>

PB

SRAM

TAG

Graphics

Control

<

TAG Control

<

PCI BUS

HOST BUS

MTXC

HOST Bridge

324 BGA

Port_A

Universal Serial Bus

Pentium

processor

>

>

Port_B

R

MA[11:0]
CONTROL

MD[63:0]

<

PIIX4

I/O Bridge

324 BGA

BIOS

Flash EPROM

Keyboard

BIOS

>

>

>

Super

I/O

IDE CD-ROM

IDE HDD

ISA Slots

Serial 1

Serial 2
FDD
Printer

Figure 1-2 System Block Diagram

1-4 P55-BT

P55-BT Layout

1

252 26

JP4

10 5

Keyboard BIOS

See Page

2-5

See Page

2-4

JP1

1

3

See Page

2-6

J18

Socket 7

<

PCI#4

JP2
J10

J9

JP8

1

3

PIIX4

W83877

PCI#3

PCI#2

CN1

FDD CONN.

PCI#1

Secondary IDE

MTXC

1

USB Conn.

JP13

Power Conn.

ATX Power Conn.

PRINTER

Primary IDE

64K*64

K/B
CONN.

COM2

COM1

BANK2

SIMM 1

SIMM 2

8 7

JP7

2 1

See Page

2-4

DIMM 2

BANK1

DIMM 1

BANK0

6 1

See Page

2-4

ATX-PW-ON

J4

HD-LED TB-LED G-LED RESETSLEEP SPEAKER KEYLOCK

JP9

IR CONN.

Note : Means Pin 1

Figure 1-1

JP14

See Page

2-4

2-1 Overview

Hardware Design 2-1

Chapter 2

Hardware design

The P55-BT is designed with Intel 82430TX PCIset chipset which is developed by

INTEL Corporation to fully support Pentium Processor PCI/ISA system. The Intel
82430TX PCIset chipset can increase integration and improve performance designs.
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 PnP
Super I/O controller provides the standard PC I/O functions: a floppy interface, two
16 Byte FIFO serial ports and an EPP/ECP capable parallel port. The P55-BT layout is
shown in the previous page for user's reference. Care must be taken when inserting
memory modules, inserting CPU or even plugging PCI card into the associated slots
to avoid damaging any circuits or sockets on board. A cooling fan is strongly
recommended when installing P54C/P54CTB/P55C (MMX)/K5/K6/6x86 (6x86L)
processor due to possible overheat. The P55-BT supports CPU temperature monitor
and alarm to prevent CPU's cooling fan from malfunction or CPUoverheat. When CPU
overheats there is a heat sensor to monitor CPU temperature, than speaker will alarm
and CPU slow down to save you data and shutdown system.

R

The P55-BT supports a minimum of 8MB of System Memory and a maximum of

256MB with 512KB synchronous SRAM Onboard to increase system performance.

The P55-BT supports standard Fast Page, EDO (Extended Data Out or Hyper Page

Mode) or synchronous DRAM. The P55-BT provides two 72-pin SIMM and two
168-pin DIMM sites for memory expansion. Each socket supports 1M x 32(4MB), 2M
x 32(8MB), 4M x 32(16MB), and 8M x 32(32MB) single-sided or double-sided memory
modules. The memory timing requires 70 ns for Fast page devices or 60 ns for EDO
DRAM. This mainboard has two 168-pin DIMM sites to support 3.3V (power level)
Unbuffered Synchronous DRAMs(SDRAM) or 5.0V (power level) Fast Page, EDO
DRAM. Memory parity generation and checking are not supported. (DRAM Mod-
ules may be parity[x 36] or non-parity[x 32].

The P55-BT supports two Onboard PCI IDE connectors that can support PIO Mode/
Ultra DMA 33 device and detect IDE harddisk type by BIOS utility automatically.

2-2 P55-BT

The P55-BT supports Award Plug & Play BIOS for the ISA and PCI cards. The BIOS
can be located in Flash EPROM. The advantage of having Flash EPROM is much
easier to replace BIOS code if necessary.

The P55-BT has been designed with AT form-factor with ATX/AT power connector.
The mainboard layout and system block diagram are shown in Figure 1-1 and Figure
1-2.

Hardware Design 2-3

2-2 Connectors and Jumpers

This section describes all of the connectors and jumpers equipped in the mainboard.
Please refer to Figure 1-1 for the location of each connector and jumper.The figure
in the following means connecting pin 1&2 and means connecting pin 2&3.
Jumpers with two pins are shown as for open and for close.

JP14 KeyLock - Keyboard lock switch & Power LED connector.

1

5

1.Power LED(+)

2.N/C

3.GND

4.Keylock

5.GND

7

Speaker - connect to the system's speaker for beeping.

7. Speaker

8. N/C

10

9. GND

10. VCC

Reset - Close to restart system.

Sleep/Resume switch : Close to enter sleep mode.

A keystrobe or mouse movement (mouse driver exists) will
instantly "wake up"the system.(for AT Power Supply Only)

+

Power Saving LED indicator - LED ON when the system is in any

saving mode.

Turbo LED indicator - LED ON when a higher speed is selected.

+

+

Harddisk LED indicator - LED ON when Onboard PCI IDE

Harddisks activites.

2-4 P55-BT

JP9 System Power ON/OFF Switch (For ATX Power Suppply Connector)

Pressing the button once will switch the system on and enter the
SLEEP MODE(Suspend mode). While in the SLEEP MODE, a
keystrobe or mouse movement(mouse driver exists) will instantly
"wake up"the system. Pressing the button while the system is on for
more than 4 seconds will turn the system off.

Note : The button should be a momentary switch that is normally on.

JP1 The Power Supply (+12V) of the CPU Cooling FAN:

1

1.GND

3

J10/J9 EPROM BIOS Selection :

2.+12V

3.GND

1

1-2 : 12V Flash EPROM (Intel).

3

JP8 Clear CMOS:

1

3

This setting allows users to clear current CMOS data to back to

2-3 : 5V Flash EPROM.(SST, Winbond).(Default)

1-2 : Normal operation (Default)
2-3 : Clear CMOS Values

default by setting the jumper to 2-3 when system is off. This
jumper should be brought back to pin 1-2 to restore the normal
operation. Here, we strongly recommend you pull out the power
cable for safety and from damage befor clearing CMOS data.

JP2 Keyboard Power ON function:

1

1-2 : Enabled

3

(For the details, please refer to Chapter 3-1: Keyboard

Power On Function)

2-3 : Disabled

Note: When Enabled or Disabled the Keyboard Power ON function.
Make sure to pull out the power cable or disconnect the 20-PIN
power supply.

7 1

JP7 DIMM1, DIMM2 (168PIN) DRAM TYPE Select:

1-2, 3-4 : Support 3.3V SDRAM (Default)

8

2

5-6, 7-8 : Support 5V EDO/FP DIMM TYPE DRAM

1J4 IrDA/ASK IR CONNECTOR:

5

1.VCC

2.NC

3.IRRX

4.GND

5.IRTX

Hardware Design 2-5

CN1 USB CONNECTOR:

1

JP13 PS/2 MOUSE CONNECTOR:

JP4:CPU Clock Rate Select. (Easy One Jumper Setting Only)

1 2

25 26

2

Reserved for USB port Adapter
(refer to APPENDIX B:I/O Connectors)

16 15

1

5

CPU

JP4
1-2 66/100MHz
3-4 60/120MHz 6x86-PR150+(120MHz)

5-6 66/133MHz 6x86-PR166+(133MHz)
7-8 75/150MHz 6x86-PR200+(150MHz)
9-10 60/150MHz 6x86MX-PR166( M2 )

11-12 66/166MHz 6x86MX-PR200( M2 )
13-14 75/188MHz 6x86MX-PR233(M2)
15-16 66/200MHz 6x86MX-PR233( M2 )
17-18 75/225MHz 6x86MX-PR266(M2)
19-20 66/233MHz 6x86MX-PR266( M2 )

21-22 66/266MHz
23-24 60/300MHz
25-26 66/333MHz

1. Data (Red Wire)

2. Clock (Blue Wire)

3. GND (Green)

4. NC

5. VCC (Yellow)

Pentium Processor
P54C / P55C Cyrix 6x86 / 6x86L / M2
AMD K5 / K6 IBM 6x86

R

(Default)

¡**

*
*

*
*

*

*

These jumper settings are reserved for the futureCPU
versions. When the future CPU versions are ready and
suitable for this mainboard, these jumper settings will be
correctly updated.

2-6 P55-BT

J18 CPU Vcore voltage selection for Pentium MMX / AMD K6 / Cyrix

10 5

3.5V

3.2V

2.9V

2.8V

2.0V

6 1

6x86L or 6x86MX

1-6 : 2.0V for AMD K6 fast processor (Reserved)
2-7 : 2.8V for Pentium P55C(MMX)/Cyrix 6X86L(Dual Voltage)
3-8 : 2.9V for AMD K6 PR166/PR200 or 6x86MX-PR166/PR200/

(Default)

RP233/PR266(Dual Voltage)
4-9 : 3.2V for AMD K6 PR233/PR266(Dual Voltage)
5-10 : 3.5V for Pentium P54C/P54CS/P54CTB/AMD K5/Cyrix

6X86(Single Voltage for Dual or Single plane)

Hardware Design 2-7

1

2

3

2-3

1.Remove

Real Time Clock Battery Replacement

The battery can be replaced by a Sanyo / Panasonic CR2032, or
other equivalent coin lithium battery. Please follow the steps below to
replace the battery.

2.Insert

+

+

+

1

2

3

+

+

+

4

+

2-8 P55-BT

2-4 System Memory Configuration

The P55-BT supports different types of settings for the system memory. There is a
jumper JP7 for SDRAM hardware setting needed for memory configuration. The
following figures show all possible memory combinations.

DIMM1

DIMM2

SIMM1
SIMM2

BANK 0

>

BANK 1

>

BANK 2 5V FP / EDO DRAM

>

3.3V Synchronous DRAM
or 3.3V FP / EDO DRAM

3.3V Synchronous DRAM
or 3.3V FP / EDO DRAM

Memory Configuration Table

DIMM (M1) DIMM2 (M2) SIMM1,SIMM2 TOTAL
(BANK 0) (BANK 1) (BANK 2) Memory

SDRAM SDRM EDO/FD DRAM MAX. =256MB
8MB, 16MB 8MB, 16MB 4M x 2 (8MB)

x 1 x 1 x 2 =

32MB 32MB 16M x 2 (64MB)

8M x 2 (16MB)

64MB, 128MB 64MB, 128MB Empty =

NOTE : 1.P55-BT supports both Fast Page DRAM and EDO DRAM SIMMs, however

they cannot be mixed in the same memory bank.

2. DIMM module specification is 3.3V / unbuffered.

LEFT KEY ZONE CENTER KEY ZONE

(UNBUFFERED)

The P55-BT supports two 168-pin DIMM module sockets to extend system
memory size.You can install (5V, JP7 1-2, 5-6, 7-8 Close) Fast Page, EDO or (3.3V /
UNBUFFERED JP7 1-2, 3-4 Close) Synchronous DRAM.

When you have a DIMM module to plug into a 168-pin dual readout connnector,
you must make sure that the DIMM module is 3.3V/Unbuffered to supports Intel
Pentium Processor System or 5V Fast Page, EDO DRAM.

R

(3.3 V DRAM)

Hardware Design 2-9

* P55-BT Supports and extends many memory configurations on its 2 SIMM and
2 DIMM sites. The memory size of any configuration can be combined flexibly.
BIOS will detect your memory configurations and sizes automaticallly.

* The 70ns Fast Page Mode or 60ns EDO is necessary.
* "BANK" = 64Bit = SIMM1, SIMM2 = DIMM1 = DIMM2

2-5 Cache Memory Configuration

The second level (L2) cache is installed in the mainboard to increase the system
performance. The P55-BT supports 512KB burst and piplined burst synchronous
SRAM.

U18

U21

TAG

SRAM

64K*64

DATA SRAM

2-10 P55-BT

2-6 Integrated PCI Bridge

The P55-BT utilizes Intel 430TX PCIset chipset to support Intel Pentium Processor

R

PCI/ISA system. The Intel 82430TX PCIset chipset consists of one 82439TX system
controller (MTXC) and one 82371AB PCI ISA/IDE Accelerator (PIIX4) bridge chip. It
provides an interface which translates CPU cycle into PCI bus cycle and PCI burst
read/write capability. In addition, it provides a high performance PCI arbiter and
supports four PCI Masters, Rotating Priority Mechanism, and Hidden Arbitration
Scheme Minimizes Arbitration Overhead. The 82371AB(PIIX4) supports PCI Specifi­cation Revision 2.1 Compliant and contains a Universal Serial Bus interface with both
host and hub control functions. P55-BT reserves a USB connector to provide two
USB ports for serial transfer at 12 or 1.5 Mbit/sec. This supports legacy keyboard
and mouse software with USB-Base Keyboard and mouse.

There are four interrupts in each PCI slot : INTA#, INTB#, INTC#, and INTD#, since
the P55-BT adapts the PCI auto-configuration with the system BIOS Setup utility.
When the system is turned on after adding a PCI add-in card, the BIOS automatically
configure interrupts, DMA channels, I/O space, and other paramaters. You do not
have to configure jumpers or worry about potential resource conflicts. Because PCI
cards use the same interrupt resource as ISA cards, you must specify the interrupts
used by ISA add-in cards in the BIOS Setup utility.

If a "Legacy card" (such as plug paddle card and cable for the ISA slot.) is plugged
in the system, modification in the ROM SETUP UTILITY becomes necessary. First,
enter PCI CONFIGURATION SETUP utility from ROM SETUP UTILITY main menu
to set the "PCI IDE IRQ MAP TO : ISA".

Second, you must enter CHIPSET FEATURES SETUP UTILITY from ROM SETUP

UTILITY main menu and set the " Onboard Primary PCI IDE: Disabled and Onboard
Secondary PCI IDE: Disable." When you plug the PCI/ISA IDE card into the system,
You should Disabled Onboard Primary and Secondary PCI IDE from CHIPSET
FEATURES SETUP UTILITY too.

When no paddle card and cable, you can set the system interrupt request (IRQ) on
the "Legacy card" (refer to user's manual of the card) to a proper system IRQ level (In
general, card's Primary is assigned to INTA and Secondary is assigned to INTB). If
the card is plugged into slot 1(marked PCI#1), you cannot use the second slot
(marked PCI#2) because the Secondary INT signal takes INTB from the slot (refer to
Page 3-12 for circuit diagram). The user then enters PCI CONFIGURATION SETUP
utility from ROM SETUP UTILITY main menu and sets the " PCI IDE IRQ MAP TO :
PCI-Slot 1" (It depends on the slot # where the Legacy card is plugged).

Introduction 3-1

Chapter 3

ATX Power Connector

Except for the AT power connector, the P55-BT also equips with ATX power
connector which is a single 20-PIN input device for ATX power supply (see Figure
3-3). To implement the built-in Remote ON/OFF function on ATX power supply, a
momentary switch which is normally open should be connected to the position JP9
as the system ON/OF button. However, an AT power supply does not come with
this function.

Based on the ATX power connector, the P55-BT has been designed to support both
ACPI and Soft-OFF functions. According to the definition of ACPI, a Suspense
mode will be enabled while you push the JP9(system ON/OFF) button less than 4
seconds. Nevertheless, the system will be turned off by pressing for more than 4
seconds. Regarding the Soft-OFF(coming from the P55-BT onboard circuit control­ler), it is another way to turn off your system. Your system can be shut down
automatically by an operation system such as Windows 95.

>

JP9

Figure 3-3: Simple ATX Power ON/OFF Controller

System Power ON/OFF
Switch

ATX
POWER
SUPPLY

P55-BT
BOARD

3-2 P55-BT

3-1 External Modem Ring-in Power ON and Keyboard Power ON
Functions

On the basis of bounded functions in I/O chipset, the two serial ports are able to
support the External Modem Ring-in Power ON function. Once users connect the
external modem to COM1 or COM2, the P55-BT mainboard allows them to turn on
their system through the remote and host's dial-up control.

Exclusive Keyboard Power ON Function

To innovate a unique feature to benefit users, we devoted ourselves to create the
easiest and most convenient way to turn on your system based on the 5.0VSB
provided by the ATX power supply. This function is available only under system
being connected to ATX power.

How to work with it

Step 1: Please push the momentary switch (JP9 button) to turn on your system and
then push again to hold for more than 4 seconds to shut down as soon as
you turn it on.
Step 2: You can enjoy the Keyboard Power-ON function by pressing any 1 or 2 keys
at the same time for 1-2 seconds. After releasing the keys, your system will
be turned on automatically. And through the existing Soft-OFF, your
system can be powered off by Windows 95.

Notes:

1. Once you pull out the power cable or disconnect the 20-PIN power

supply, you have to repeat the Step 1 to re-enable this function.

2. The number of keys needed to turn on a system depends on the type of
keyboard you are appplying since the different loading on each keyboard.
Here, we would like to suggest you push 2 keys together.

3. Intel ATX version 2.0 specification has recommended you use the power
supply with 0.72A(720mA). With our P55-BT mainboard, the 5.0VSB standby
power only has to be > = 0.1A (100mA) then you can enjoy this unique benefit.
However, the ATX power supply which is < 0.1 (100mA) is still applicable to
your system by setting the JP2 to 2-3 to disable this feature.

4. When Enabled or Disabled the Keyboard Power ON function by JP2. Make
sure to pull out the power cabled or disconnect the 20-PIN power supply.

AWARD BIOS 4-1

Chapter 4

Award BIOS Setup

Award's ROM BIOS provides a built-in Setup program which allows user to modify the
basic system configuration and hardware parameters. The modified data will be stored
in a battery-backed CMOS RAM so data will be retained even when the power is turned
off. In general, the information saved in the CMOS RAM stay unchanged unless there
is configuration change in the system, such as hard drive replacement or new equipment
change.

It is possible that the CMOS battery is dead. This will cause data lose in CMOS RAM.
If so, it is necessaiy to re-enter system configuration parameters.

To enter Setup Propgram

Power on the computer and press <Del> key immediately. This will bring you into BIOS
CMOS SETUP UTILITY.

ROM PCI/ISA BIOS(2A59IPA9)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP SUPERVISOR PASSWORD
BIOS FEATURES SETUP USER PASSWORD
CHIPSET FEATURES SETUP IDE HDD AUTO DETECTION
POWER MANAGEMENT SETUP HDD LOW LEVEL FORMAT
PNP/PCI CONFIGURATION SAVE & EXIT SETUP
INTEGRATED PERIPHERALS EXIT WITHOUT SAVING
LOAD SETUP DEFAULTS

ESC : QUIT : SELECT ITEM
F10 : Save & Exit Setup (Shift)F2 : Change Color

The menu displays all the major selection items and allows user to select any shown
items. The selection is made by moving cursor (press any direction key ) to the item
and press 'Enter' key. An on-line help message is displayed at the bottom of the
screen as cursor is moving to various items which provides user better understand­ing of each function. When a selection is made, the menu of selected item will appear
so the user can modify the associated configuration parameters.

Time, Date, Hard Disk Type...

Figure 4-1 CMOS SETUP UTILITY

4-2 CHAPTER 4

4-1 Standard CMOS Setup

Choose " STANDARD CMOS SETUP" in the CMOS SETUP UTILITY Menu (Fig.4-1).
The STANDARD CMOS SETUP allows user to configure system setting such as current
date and time, type of hard disk drive installed in the system, floppy drive type, and the
type of display monitor. Memory size is auto-detected by the BIOS and displayed for your
reference. When a field is highlighted (direction keys to move cursor and <Enter> key to
select), the entries in the field will be changed by pressing <PgDn> or <PgUp> keys or
user can enter new data directly from the keyboard.

ROM PCI/ISA BIOS(2A59IPA9)

STANDARD CMOS SETUP

AWARD SOFTWARE, INC.

Date (mm:dd:yy) : Wed, Apr 17 1996
Time (hh:mm:ss) : 14 : 30 : 50

HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDZONE SECTORS MODE
Primary Master : Auto 0 0 0 0 0 0 Auto
Primary Slave : Auto 0 0 0 0 0 0 Auto
Secondary Master : Auto 0 0 0 0 0 0 Auto
Secondary Slave : Auto 0 0 0 0 0 0 Auto

Drive A : 1.44M, 3.5 in.
Drive B : None
Floppy 3 Mode Support : Disabled
Video : EGA/VGA
Halt On : All Errors

ESC : Quit : Select Item PU/PD/+/- : Modify
F1 : Help (Shift) F2 : Change Color

Base Memory : 640K
Extended Memory : 5360K
Other Memory : 384K

Total Memory : 16384K

Figure 4-2 STANDARD CMOS SETUP

NOTE: If hard disk Primary Master/Slave and Secondary Master/Slave were used Auto,
then the hard disk size and model will be auto-detected on display during POST.

NOTE: The "Halt On :" field is to determine when to halt the system by the BIOS if error
occurrs during POST.

4-2 BIOS Features Setup

Selecting the "BIOS FEATURES SETUP" option in the CMOS SETUP UTILITY menu
allows user to change system related parameters in the displayed menu. This menu shows
all of the manufacturer's default values of P55-BT. Again, user can move the cursor by
pressing direction keys and <PgDn> or <PgUp> keys to modify the parameters. Pressing
[F1] key to display help message of the selected item.

This setup program also provides 2 convenient ways to load the default parameter data
from BIOS[F6] or CMOS[F7] area if shown data is corrupted. This provides the system
a capability to recover from any possible error.

AWARD BIOS 4-3

ROM PCI/ISA BIOS(2A59IPA9)

BIOS FEATURES SETUP

AWARD SOFTWARE, INC.

Virus Warning : Disabled Video BIOS Shadow : Enabled
CPU Internal Cache : Enabled C8000-CBFFF Shadow : Disabled
External Cache : Enabled CC000-CFFFF Shadow : Disabled
Quick Power On Self Test : Enabled D0000-D3FFF Shadow : Disabled
Boot Sequence : A, C, SCSI D4000-D7FFF Shadow : Disabled
Swap Floppy Drive : Disabled D8000-DBFFF Shadow : Disabled
Boot Up Floppy Seek : Enabled DC000-DFFFF Shadow : Disabled
Boot Up NumLock Status : On
Boot UP System Speed : High
Gate A20 option : Fast
Typematic Rate Setting : Disabled
Typematic Rate (Chars/Sec) : 6
Type matic Delay (Msec) : 250
Security Option : Setup
PCI/VGA Palette Snoop : Disabled
OS Select For DRAM > 64MB : Non-OS2

Esc : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift)F2 : Color
F7 : Load Setup Defaults

Figure 4-3 BIOS FEATURES SETUP

Note: The Security Option contians "setup" and "system". The "setup" indicates

that the password setting is for CMOS only while the " system" indicates the
password setting is for both CMOS and system boot up procedure.

Virus Warning: This category flashes on the screen. During and after the system
boots up, any attempts to write to the boot sector or partition table of the hard disk
drive will halt the system and an error message will appear. You should then run an
anti-virus program to locate the virus. Keep in mind that this feature protects only the
boot sector, not the entire hard drive. Default value is Disabled
Enabled : Activates automatically when the system boots up causing a warning

message to appear when anything attempts to access the boot sector.

Disabled : No warning message to appear when anything attempts to access the

boot sector.

Note : Many disk diagnostic programs that access the boot sector table can trigger the
virus warning message. If you plan to run such a program, we recommend that you
first disable the virus warning.

CPU Internal Cache / External Cache:These two categories speed up memory access.
however, it depends on CPU / chipset design. The default value is Enable. If your CPU is
without Internal Cache then this item "CPU Internal Cache" will not be shown.

Enabled : Enable cache.
Disable : Disable cache.

4-4 CHAPTER 4

Quick Power On Self Test:This category speeds up Power On Self Test (POST)
after you power on the computer. If it is set to Enable, BIOS will shorten or skip
some check items during POST. The default is Enabled.

Enabled : Enable quick POST.
Disabled: Normal POST.

Boot Sequence:This category determines which drive is searched first for the O/S
(Operating System). Default value is A, C, SCSI. The following is your list of options.
[A, C, SCSI]-[C, A, SCSI]-[C, CDROM, A]-[CDROM, C, A]-[D, A, CDROM]
[E, A, CDROM]-[F, A, CDROM]-[SCSI, A, C]-[SCSI C, A]-[C Only], [LS/ZIP, C]

A,C :System will first search for floppy disk drive then hard disk drive.
C,A :System will first search for hard disk drive then floppy disk drive.

CDROM,C,A:System will first search for the CDROM drive (If the CDROM has a

bootable CD title.) and second search hard disk drive then flopp
disk drive.

C,CDROM,A:System will first search for the hard disk drive and second search

the CDROM drive (If the CDROM has a bootable CD title.) then
floppy disk drive.

Swap Floppy Drive: This will swap your physical drive letters A & B if you are using
two floppy disks. Default value is Disabled.

Enabled : Floppy A & B are able to swap under DOS.
Disabled: Floppy A & B are not able to swap.

Boot Up Floppy Seek: During Power-On-Self-Test (POST), BIOS will determine if the
floppy disk drive installed is 40 or 80 tracks. Only is 360K type 40 tracks while 760K,

1.2M and 1.44M are all 80 tracks. The default value is Enabled.
Enabled : BIOS searches for floppy disk drive to determine if it is 40 or 80 tracks,
Note that BIOS cannot tell from 720K, 1.2M or 1.44M drive type as
they are all 80 tracks.
Disabled: BIOS will not search for the type of floppy disk drive by track number.
Note that there will not be any warning message if the drive installed
is 360K.

Boot Up NumLock Status: Control the state of the Numlock key when the system
boots. The default value is On.

On : Keypad is number keys.
Off : Keypad is arrow keys.

Boot UP System Speed: Select Hight to boot at the default CPU speed; select Low to
boot at the speed of the AT bus.

High: Set the speed to high.
Low : Set the speed to low.

AWARD BIOS 4-5

Gate A20 Option: This refers to the way the system addresses memory above 1MB
(extended memory). The default value is Fast.

Normal : The A20 signal is controlled by keyboard controller or chipset hardware.
Fast : The A20 signal is controlled by Port 92 or chipset specific method.

Typematic Rate Setting: This determines the keystroke repeat rate.

Enabled : Enable typematic rate and typematic delay programming.
Disabled: Disable typematic rate and typematic delay programming. The rate will be

controlled by keyboard controller in your system.

Typematic Rate(Chars/Sec):

6 : 6 characters per second. 8 : 8 characters per second.
10: 10 characters per second. 12: 12 characters per second.
15: 15 characters per second. 20: 20 characters per second.
24: 24 characters per second. 30: 30 characters per second.

Typematic Delay(Msec): When holding a key, the time between the first and

second character displayed.
250 : 250msec.
500 : 500 msec.
750 : 750 msec.
1000: 1000 msec.

Security Option: This category allows you to limit access to the system and Setup, or
just to Setup. The default value is Setup.
System: The system will not boot and the access to Setup will be denied if the correct

password is not entered at the prompt.

Setup : The system will boot, but the access to Setup will be denied if the incorrect

password is not entered at the prompt.

PCI/VGA Palette Snoop: This filed controls the ability of a primary PCI VGA

controller to share a common palette(when a snoop write cycles) with an ISA
video card. The default value is Disabled.
Enabled:If an ISA card connects to a PCI VGA card via the VESA connector

and that ISA card connects to VGA monitor and that ISA card uses
the RAMDAC of PCI card.

Disabled:Disable the VGA card Palette snoop function.

Video BIOS Shadow: It determines whether video BIOS will be copied to RAM,

however; it is optional from chipset design. Video Shadow will increase the video
speed.

Enabled : Video shadow is enabled.
Disabled: Video shadow is disabled.

4-6 CHAPTER 4

C8000 - CBFFF Shadow :
CC000 - CFFFF Shadow:
D0000 - D3FFF Shadow:
D4000 - D7FFF Shadow:
D8000 - DBFFF Shadow:
DC000 - DFFFF Shadow:

These categories determine whether other expansion card optional ROM will be
copied to RAM by 16K byte or 32K byte per unit and the size depends on chipset. If
you install other expansion cards with ROMs on them, you will need to know which
addresses the ROMs use to shadow themselves specifically.

Enabled : Optional shadow is enabled.
Disabled: Optional shadow is disabled.

4-3 Chipset Features Setup

Choose the "CHIPSET FEATURES SETUP" in the CMOS SETUP UTILITY menu to
display the following menu.

ROM PCI/ISA BIOS(2A59IPA9)

CHIPSET FEATURES SETUP

AWARD SOFTWARE, INC.

Auto Configuration : Enabled Current MB Temperature : 38C/100F
DRAM Timing : 60ns CPU Warning Temperature : 60C/140F
DRAM Leadoff Timing : 10 / 6 / 3
DRAM Write Burst Timing : x333
Fast EDO Lead Off : Enabled
Refresh RAS# Assertion : 4 Clks
Fast RAS To CAS Delay : 2
DRAM Page Idel Timer : 2 Clks
DRAM Enhanced Paging : Enabled
Fast MA to RAS# Delay : 2 Clks
SDRAM (CAS Lat/RAS-to-CAS) : 2/2
SDRAM Speculative Read : Disabled
System BIOS Cacheable : Disabled
Video BIOS Cacheabled : Enabled
8 Bit I/O Recovery Time : 1
16 Bit I/O Recovery Time : 2
Memory Hole At 15M-16M : Disabled
PCI 2.1 Compliance : Disabled

ESC : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift) F2 : Color
F7 : Load Setup Defaults

Figure 4-4 CHIPSET FEATURES SETUP

Auto Configuration: Selects predetermined optinal values of chipset parameters.

When Disabled, chipset parameters revert to setup information stored in COMS.
Many fields in this screen are not available when Auto Configuration is Enabled.

AWARD BIOS 4-7

Note: When you insert slow memory modules in the system and set a faster timing,

the system may hang up.

DRAM Timing: The default value is 60ns.

60ns : 2 (faster) Burst Wait State, for 60~70ns Fast Page Mode/EDO DRAM.
70ns : 3 (slower) Burst Wait State, for 70ns Fast Page Mode/EDO DRAM.

DRAM Leadoff Timing: The default value is 10/6/3 (Read Leadoff / Write Leadoff /
RAS# Precharge)

10/6/3 : For EDO / FPM reads and Writes timing.
11/7/3 : For slow EDO /FPM reads and Writes timing.

DRAM Writes Burst Timing: The default value is x222.

x222 : For EDO / FPM of the fast burst mode timings.
x333 : For EDO /FPM of the slow burst mode timings.

Fast EDO Lead off : The default value is Enabled.

Enabled : This field Enables fast timing EDO read cycles.
Disabled : Disables the fast timing EDO read cycles.

Refresh RAS# Assertion : The default value is 4 clks.

4 : This field controls the number of 4 clocks. RAS# is asserted for Refresh.
5 : This field controls the number of 5 clocks. RAS# is asserted for Refresh.

Fast RAS To CAS Delay : The default value is 2.

2 : This field controls a RAS# to CAS# delay is 2.
3 : This field controls a RAS# to CAS# delay is 3.

Fast MA to RAS# Delay : The default value is 2 Clks.

1 Clks : This field controls Memory Address to RAS's timing is 1 HCLKS.
2 Clks : This field controls Memory Address to RAS's timing is 1 HCLKS.

SDRAM (CAS Lat / RAS-to-CAS) : The default value is 2 / 2.

2/2 : This field controls a RAS# to CAS# delay of 2 HCLKS is provided for SDRAM.
3/3 : This field controls a RAS# to CAS# delay of 3 HCLKS is provided for SDRAM.

SDRAM Speculative Read : The default value is Disabled.

Enabled : Enables the SDRAM speculative read logic.
Disabled : Disables the SDRAM speculative read logic.

System BIOS Cacheable:

Enabled : Allows caching of the system BIOS ROM at F0000h-FFFFFh, resulting

in better system performance. However, if any program writes to this
memory area, a system error may result.

Disabled : System BIOS non-cacheable

4-8 CHAPTER 4

Video BIOS Cacheable: The default value is enabled.

Enabled : This field Enables the Video BIOS Cacheable to speed up the VGA

Performance.

Disabled: Disables the Video BIOS Cacheable function.
8/16 Bit I/O Recovery Time: The default value is 1.

8 Bit I/O Recovery Time: This field defines the recovery time from 1 to 8 for 8-

bit I/O.

16 Bit I/O Recovery Time: To define the recovery time from 1 to 4 for 16-bit I/O.
Memory Hole at 15M-16M: The default value is disabled.

Disabled: Normal Setting.
Enabled : This field enables the main memory (15~16MB) remap to ISA BUS.

This feature reserves 15MB to 16MB memory address space to ISA
expansion card that specifically require this setting.

PCI 2.1 Compliance:The default value is Disabled.

Enabled: This field Enables the PCI 2.1 Compliance timing.
Disabled: Disables the PCI 2.1 timing.

Current MB Temperature:This field will Auto-detect the MB temperature when enter

the CHIPSET FEATURES SETUP.

CPU Warning Temperature:The default value is 60C/140F.
The purpose of this setting is to enable the CPU temperature warning & protection

function so that we can detect and monitor the fluctuant temperature during system
operation.
If the cooling fan applied to the CPU does not have enough power to control and cool
down the heat or is broken while running, the indicator of the current M/B tempera­ture will be higher and higher.
To protect the CPU while the temperature is up to CPU warning temperature for
example 60C(the default value), the alarm will be activated and CPU speed will be
slowed down at the same time. At this moment, you have to save your data into disks
and then shut down system to cut off the alarm.
The thermal conductibility of a CPU and the cooling fan are playing two key roles to
determine whether the overheat problem could be happened or not. For example, if
you are using a high performance CPU but applying a low power cooling fan, the
situation mentioned above will happen again.
The setting value is available from 50C/122F to 70C/158F.

4-4 Power Management Setup

Choose the "POWER MANAGEMENT SETUP" in the CMOS SETUP UTILITY
to display the following screen. This menu allows user to modify the power
management parameters and IRQ signals. In general, these parameters should not
be changed unless it's absolutely necessary.

AWARD BIOS 4-9

ROM PCI/ISA BIOS (2A59IPA9)

POWER MANAGEMENT SETUP

AWARD SOFTWARE, INC.

Power Management : User Define ** Reload Global Timer Events **
PM Control by APM : Yes IRQ [3-7, 9-15], NMI : Enabled
Video off Method : V/H SYNC+Blank Primary IDE 0 : Disabled
Video off After : Standby Primary IDE 1 : Disabled

Doze Mode : Disable Secondary IDE 1 : Disabled
Standby Mode : Disabled Floppy Disk : Disabled
Suspend Mode : Disabled Serial Port : Disabled
HDD Power Down : 15 Min Parallel Port : Disabled
VGA Active Monitor : Enabled
Soft-OFF by PWB-BTTN : Delay 4 Sec.

** Break Event From Suspend **
IRQ 8 Clock Event : Disabled

Secondary IDE 0 : Disabled

ESC : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift) F2 : Color
F7 : Load Setup Defaults

Figure 4-5 POWER MANAGEMENT SETUP

Again, user can move the cursor by pressing direction keys to the field needed to be
modified and press <PgDn> or <PgUp> to alter item selection. You can only change
the content of Doze Mode, Standby Mode, and Suspend Mode when the Power

Management is set to 'User Define'.

Note: When the computer enters suspend mode (setting the suspend mode valid

range from 1 minute up to 1 hour) activated by the BIOS power Management.
You need to RUN a program POWER.EXE under DOS root, or need to add
DEVICE=C:\DOS\POWER.EXE in your CONFIG.SYS. This will keep the
system time updated normally when the system wake up from the suspend
mode. The supend mode for Windows 95 or Windows 3.1x has to install

R

R

windows APM feature. Choose "Advanced Power Management" item from
"system device". The "system device" field was from "system" icon in the
"control panel".

4-4-1 The Description of the Power Management

A. Power Management mode selection :
Disabled : The system operates in NORMAL conditions (Non-GREEN) and

Max. saving : Maximum power savings. Inactivity period is 1 minute in each

Min. saving : Minimum power savings. Inactivity period is 1 minute in each mode.
User Define : Allows user to define PM Timers parameters to control power

the Power Management function is disabled.

mode.

saving mode.

4-10 CHAPTER 4

B. Time-out parameters :

HDD Standby

The HDD Standby timer can be set from 1 to 15 minute(s).

System Doze

The "System Doze" mode timer starts to count when no "PM event"
occurres. The valid time-out setting is from 1 minute up to 1 hour.

System Standby

The "Standby" mode timer starts to count when the "System Doze" mode timer times
out and no "PM events" occurred. The valid range is from 1 minute up to 1 hour.

System Suspend

This function works only when the Pentium Procssor is installed. The timer starts

R

to count when the "System Standby" mode timer times out and no "PM Event"
occurres. The valid range is from 1 minute up to 1 hour.

4-4-2 Description of the Green Functions

PM Control by APM:

If Advanced Power Management (APM) is installed on your system, selecting Yes

gives better power savings.

Video Off Method: Determines the manner in which the monitor is blanked.
V/H SYNC+Blank:

System turns off vertical and horizontal synchronization ports and writes blanks to the
video buffer.

DPMS Support:

Select this option if your monitor supports the Display Power Management Signaling
(DPMS) standard of the Video Electronics Standards Association (VESA). Use the
software supplied for your video subsystem to select video power management values.

Blank Screen:

System only writes blanks to the video buffer.

Video off After: Determines when to activate the video off feature for monitor power
management. The settings are Video off after Suspend/standby/Doze/(N/A).

Soft-off by PWR-BTTN: This field is for the soft-off function setting. When the board
utilizes an ATX power supply, two types of settings are offered: Delay 4 Sec. and
instant-Off. When the setting is Delay 4 Sec.,users can power off the system by
pressing JP9 for 4 seconds. However, if users press JP9 for less than 4 seconds, the
system will enter the Suspend Mode. When the setting is instant-Off, users' first press
on JP9 will power off the system, but the second press will power on the system.

AWARD BIOS 4-11

The P55-BT supports HDD Power Down, Doze and standby power saving functions
when Intel Pentium Processor is installed. In addition, the suspend function

R

is supported when the JP14's sleep (sleep ref. Figure1-1) is closed to enter the green
function. The detailed descriptions of these functions are provided in the next page.

HDD Power Down

When the system stops reading or wiriting HDD, the timer starts to count. The system
will cut off the HDD power when timer runs out of time. The system will not resume
operation until either a read from or a wirte to HDD command is executed again.

Doze Mode

The system hardware will drop down CPU clock from normal working speed
when Doze mode timeout occurrs.

Standby Mode

When the system standby mode timer runs out, it will enter the standby mode and
retain CPU at slow working speed. The screen will be blanked out.

Suspend Mode

When the system suspend timer times out, the system will enter the suspend mode
and the chipset will stop CPU clock immediately. The power consumption in
Suspend Mode is lower than in standby mode. The screen is also blanked out.

PM Events:

AWARD BIOS defines Reload Global Timer Events in the power management mode
(Doze,standby & suspend). The user can initialize any PM Events to be "Enabled" or
"Disabled". When the system detects all of the enabled events which do not have any
activity, it will start the system Doze timer first if the "Power Management" isn't
"Disabled". Once the system Doze timer is timed out, it will process doze power saving
procedure by starting the system standby timer. When the standby timer ran out and
all of the "Enabled" events remains silent, the system will enter the standby mode. By
now, the system will not only process the standby power saving procedures but also
start the system suspend timer. When the suspend timer times out, all of the CPU clock
will stop by dropping system clock down to zero and remains this way until any one
of the "Enabled" event occurrs.

4-5 PnP/PCI Configuration

The PnP/PCI configuration program is for the user to modify the PCI/ISA IRQ signals when
various PCI/ISA cards are inserted in the PCI or ISA slots.

WARNING : Any misplacing IRQ could cause system cannot pick up the rescouces.

4-12 CHAPTER 4

ROM PCI/ISA BIOS(2A59CPA9)

PNP/PCI CONFIGURATION

AWARD SOFTWARE, INC.

PNP OS Installed : NO PCI IDE IRQ Map To : PCI-AUTO
Resources Controlled By : Manual Primary IDE INT# : A
Reset Configuration Data : Disabled Secondary IDE INT# : B

IRQ-3 assigned to : Legacy ISA
IRQ-4 assigned to : Legacy ISA
IRQ-5 assigned to : PCI/ISA PnP
IRQ-7 assigned to : PCI/ISA PnP
IRQ-9 assigned to : PCI/ISA PnP
IRQ-10 assigned to : PCI/ISA PnP
IRQ-11 assigned to : PCI/ISA PnP
IRQ-12 assigned to : PCI/ISA PnP
IRQ-14 assigned to : PCI/ISA PnP
IRQ-15 assigned to : PCI/ISA PnP
DMA-0 assigned to : PCI/ISA PnP
DMA-1 assigned to : PCI/ISA PnP
DMA-3 assigned to : PCI/ISA PnP
DMA-5 assigned to : PCI/ISA PnP
DMA-6 assigned to : PCI/ISA PnP
DMA-7 assigned to : PCI/ISA PnP

ESC : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift) F2 : Color
F7 : Load Setup Defaults

Figure 4-6 PCI CONFIGURATION SETUP

Resource Controlled By:The default value is Manual.
Manual :PNP Card's resources will be controlled manually. You can set which

IRQ-X and DMA-X are assigned to PCI/ISA PNP or Legacy ISA Cards.

Auto :If your ISA card and PCI card are all PNP cards, BIOS will assign the

interrupt resource automatically.

Reset Configuration Data:The default value is disabled.
Disabled:Normal Setting
Enabled :If you had plugged some Legacuy cards in the system and recorded into

ESCD(Extended System Configuration Data), you can set this field to
enabled to clear ESCD.

PCI IDE IRQ Map To:The default value is PCI-AUTO

When you have true PCI card(s) plugged into the system, you will not need
to change any thing here in the SETUP program. However, if you do not
know whether you have true PCI card or not, please refer to your PCI card
user's manual for the details.

When you have a legacy card (describbed in section 2-6) to be plugged
into the system,a proper setting is extremely important or it may cause the
system hang. The diagram shown below tells you how the Rotating
Priority Mechanism is designed.

AWARD BIOS 4-13

Used MEM base addr and Used MEM Length : The default value is N/A.

The Used MEM base addr (CB00, CC00, D000, D400, D800, DC00) and
Used MEM Length (8K, 16K, 32K, 64K) support some specific ISA
Legacy cards with requested memory space below 1M address. Now with
these two functions, users can define where the used memory address is
located and its length of the legacy area corresponding. Based on these,
BIOS will skip the UMB area that is used by the legacy device to avoid
the memory space conflict. For example, if users select "D000"for"Used
MEM base addr" and "16K" for "Used MEM Length", that means the
address region D0000H-D3FFFH is occupied by ISA legacy cards, and
thus BIOS will not assign this region for PnP/ISA and PCI cards.

PCI#4

INTB

INTC

INTD
INTA

INTC

INTB

INTD

INTC

PCI#1PCI#2PCI#3

INTA

INTBINTAINTD

INTCINTBINTA
INTD

INTA

INTB

INTC

INTD

Figure 4-7 The Combination of PCI INT# lines

PCI

Chipset

4-14 CHAPTER 4

4-6 Integated Peripherals

ROM PCI/ISA BIOS(2A59IPA9)

INTEGRATED PERIPHERALS

WARD SOFTWARE, INC.

IDE HDD Block Mode : Enabled Onboard Parallel Mode : ECP / EPP
IDE Primary Master PIO : Auto ECP Mode Ise DMA : 3
IDE Primary Slave PIO : Auto Parallel Port EPP Type : EPP1.9
IDE Secondary Master PIO : Auto
IDE Secondary Slave PIO : Auto
IDE Primary Master UDMA : Auto
IDE Primary Slave UDMA : Auto
IDE Secondary Master UDMA : Auto
IDE Secondary Slave UDMA : Auto
Onboard Primary PCI IDE : Enabled
Onboard Secondary PCI IDE : Enabled
USB Keyboard Support : Disabled

Onboard FDD Controller : Enabled
Onboard Serial Port 1 : Auto
Onboard Serial Port 2 : Auto
UART 2 Mode : Standard

Onboard Parallel Port : 378/IRQ7

If you don't use the Onboard IDE connector, than use On-card

Note:

ESC : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift) F2 : Color
F7 : Load Setup Defaults

(PCI or ISA card) IDE connector. You will set Onboard Primary
PCI IDE: Disabled and Onboard Secondary PCI IDE: Disabled
from CHIPSET FEATURES SETUP UTILITY.

The Onboard PCI IDE cable should be equal to or less than

18 inches (45 cm.).

IDE HDD Block Mode: Select enabled only if your hard drives support block mode.

Enabled : Enabled IDE HDD Block Mode. Provides higher HDD transfer rates.
Disabled: Disable IDE HDD Block Mode.

IDE Primary (Secondary) Master/Slave PIO : The default value is Auto.
This field is Selectable Primary (Secondary) IDE PIO Mode (0~4) for HDD.

IDE Primary (Secondary) Master/Slave UDMA : The default value is Auto.

Auto : Select Primary (Secondary) IDE used Ultra DMA HDD.
Disabled : Disabled Primary (Secondary) IDE used Ultra DMA HDD.

Onboard Primary PCI IDE: The default value is enabled.

Enabled : Enable Onboard 1st channel IDE port.
Disabled : Disable Onboard 1st channel IDE port, when using On-card (PCI or ISA

card) IDE connector.

Onboard Secondary PCI IDE: The default value is enabled.

Enabled : Enable Onboard 2nd channel IDE port.
Disabled : Disable Onboard 2nd channel IDE port when using On-card (PCI or ISA

card) IDE connector.

AWARD BIOS 4-15

IDE Primary Master PIO: The default value is Auto.

Auto : BIOS will automatically detect the Onboard Primary Master PCI

IDE HDD Accessing mode.

Mode0~4 : Manually set the IDE Accessing mode.

IDE Primary Slave PIO: The default value is Auto.

Auto : BIOS will automatically detect the Onboard Primary Slave PCI IDE

HDD Accessing mode.

Mode0~4 : Manually set the IDE Accessing mode.

IDE Secondary Master PIO: The default value is Auto.

Auto : BIOS will automatically detect the Onboard Secondary Master PCI

IDE HDD Accessing mode.

Mode0~4 : Manually set the IDE Accessing mode.

IDE Secondary Slave PIO: The default value is Auto.

Auto : BIOS will automatically detect the Onboard Secondary Slave PCI

IDE HDD Accessing mode.

Mode0~4 : Manually set the IDE Accessing mode.

Onboard FDC Controller: The default value is Enabled.

Enabled : Enable the Onboard SMC CHIP's floppy drive interface controller.
Disabled: Disable the Onboard SMC CHIP's floppy drive interface controller,

when using On-card ISA FDC's controller.

Onboard UART 1: This field allows the user to sellect the serial port. The default
value is 3F8H/IRQ4.

COM1: Enable Onboard Serial port 1 and address is 3F8H/IRQ4.
COM2: Enable Onboard Serial port 1 and address is 2F8H/IRQ3.
COM3: Enable Onboard Serial port 1 and address is 3E8H/IRQ4.
COM4: Enable Onboard Serial port 1 and address is 2E8H/IRQ3.
Disabled: Disable Onboard SMC CHIP's Serial port 1.

Onboard UART 2: This field allows the user to sellect the serial port. The default
value is 2F8H/IRQ3.

COM1: Enable Onboard Serial port 2 and address is 3F8H/IRQ4.
COM2: Enable Onboard Serial port 2 and address is 2F8H/IRQ3.
COM3: Enable Onboard Serial port 2 and address is 3E8H/IRQ4.
COM4: Enable Onboard Serial port 2 and address is 2E8H/IRQ3.
Disabled: Disable Onboard SMC CHIP's Serial port 2.

4-16 CHAPTER 4

Onboard UART 2 Mode:The default value is standard. This field allows the user to
select the COM2 port that can support a serial Infrared Interface.

standard:Support a Serial Infrared Interface IrDA.
HPSIR:Support a HP Serial Infrared Interface formats.
ASKIR:Support a Sharp Serial Infrared Interface formats.

Onboard Parallel port: This field allows the user to sellect the LPT port. The

default value is 378H/IRQ7.

378H : Enable Onboard LPT port and address is 378H and IRQ7
278H : Enable Onboard LPT port and address is 278H and IRQ5.
3BCH : Enable Onboard LPT port and address is 3BCH and IRQ7.
Disabled : Disable Onboard SMC CHIP's LPT port.

NOTE: Parallel Port address is 378H/3BCH that selects the rounting of IRQ7 for LPT1.

Parallel Port address is 278H that selects the rounting of IRQ5 for LPT1.

Parallel port Mode: This field allows the user to sellect the parallel port mode.

The default value is ECP+EPP.

Normal : Standard mode. IBM PC/AT Compatible bidirectional parallel port.
EPP : Enhanced Parallel Port mode.
ECP : Extended Capabilities Port mode.
EPP+ECP : ECP Mode & EPP Mode.

ECP Mode USE DMA: This field allows the user to sellect DMA1 or DMA3 for
the ECP mode. The default value is DMA3.

DMA1 : The filed selects the rounting of DMA1 for the ECP mode.
DMA3 : The filed selects the rounting of DMA3 for the ECP mode.

4-7 Load Setup Defaults

The "LOAD SETUP DEFAULTS" function loads the system default data directly from
ROM and initializes the associated hardware properly. This function will be necessary
only when the system CMOS data is corrupted.

AWARD BIOS 4-17

ROM PCI/ISA BIOS(2A59IPA9)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

STANDARD CMOS SETUP SUPERVISOR PASSWORD
BIOS FEATURES SETUP USER PASSWORD
CHIPSET FEATURES SETUP IDE HDD AUTO DETECTION
POWER MANAGEMENT SETUP HDD LOW LEVEL FORMAT
PNP/PCI CONFIGURA ETUP
INTEGRATED PERIPH SAVING

LOAD SETUP DEFAULTS

ESC: QUIT :SELECT ITEM
F10:Save & Exit Setup (Shift)F2 :Change Color

Load Setup Defaults Except Standard COMS SETUP

Load SETUP Default (Y/N)? Y

Figure 4-8 LOAD SETUP DEFAULT

4-8 Change Supervisor or User Password

To change the password, choose the "SUPERVISOR PASSWORD or USER PASS­WORD " option from the CMOS SETUP UTILITY menu and press [Enter].

NOTE : Either "Setup" or "System" must be selected in the "Security Option" of the

BIOS FEATURES SETUP menu (Refer to Figure 4-3 for the details).

1. If CMOS is corrupted or the option was not used, a default password stored in the

ROM will be used. The screen will display the following message:

Enter Password:

Press the [Enter] key to continue after proper password is given.

2. If CMOS is corrupted or the option was used earlier and the user wish to change

default password, the SETUP UTILITY will display a message and ask for a
confirmation.

Confirm Password:

3. After pressing the [Enter] key (ROM password if the option was not used) or current

password (user-defined password), the user can change the password and store the
new one in CMOS RAM. A maximum of 8 characters is acceptable.

4-18 CHAPTER 4

4-9 IDE HDD Auto Detection

The "IDE HDD AUTO DETECTION" utility is a very useful tool especially when you
do not know which kind of hard disk type you are using. You can use this utility to detect
the correct disk type installed in the system automatically. But now you can set HARD
DISK TYPE to Auto in the STANDARD CMOS SETUP. You don't need the "IDE
HDD AUTO DETECTION" utility. The BIOS will Auto-detect the hard disk size and
model on display during POST.

ROM PCI/ISA BIOS(2A59IPA9)

CMOS SETUP UTILITY

AWARD SOFTWARE, INC.

HARD DISKS TYPE SIZE CYLS HEADS PRECOMP LANDZONE SECTORS MODE

Primary Master : 343 665 16 65535 664 63 NORMAL
Primary Slave :
Secondary Master :
Secondary Slave :

Select Secondary Slave Option (N=Skip) : N

OPTIONS SIZE CYLS HEAD PRECOMP LANDZ SECTOR MODE

1 (Y) 0 0 0 0 0 0 NORMAL

ESC : Skip

Figure 4-9 IDE HDD AUTO DETECTION

NOTE: HDD Modes

The Award BIOS supports 3 HDD modes : NORMAL, LBA & LARGE
NORMAL mode
Generic access mode in which neither the BIOS nor the IDE controller will
make any transformations during accessing.
The maximum number of cylinders, heads and sectors for NORMAL mode are
1024, 16 and 63.
no. Cylinder (1024)
x no. Head ( 16)
x no. Sector ( 63)
x no. per sector ( 512)
528 Megabytes
If users set his HDD to NORMAL mode, the maximum accessible HDD size
will be 528 Megabytes even though its physical size may be greater than that.

AWARD BIOS 4-19

LBA (Logical Block Addressing) mode

A new HDD accessing method to overcome the 528 Megabyte bottleneck. The
number of cylinders, heads and sectors shown in the setup may not be the number
physically contained in the HDD.

During HDD accessing, the IDE controller will transform the logical address
described by sector, head and cylinder into its own physical address inside the HDD.

The maximum HDD size supported by LBA mode is 8.4 Gigabytes which is
obtained by the following formula:

no. Cylinder (1024)
x no. Head ( 255)
x no. Sector ( 63)
x bytes per secttor ( 512)

8.4 Gigabytes

LARGE mode

Extended HDD access mode is supported by Award Software.

Some IDE HDDs contain more than 1024 cylinder without LBA support (in some
cases, users do not want the LBA mode). The Award BIOS provides another

alternative to support these kinds of LARGE mode:

CYLS. HEADS SECTOR MODE
1120 16 59 NORMAL
560 32 59 LARGE

BIOS tricks DOS (or other OS) that the number of cylinders is less than 1024 by
dividing it by 2. At the same time, the number of heads is multiplied by 2. Areverse
transformation process will be made inside INT 12h in order to access the right
HDD address.

Maximum HDD size:

no. Cylinder (1024)
x no. Head ( 32)
x no. Sector ( 63)
x bytes per sector ( 512)
1 Gigabytes

4-20 CHAPTER 4

Note:

To support LBA or LARGE mode of HDDs, there must be some softwares involved. All
these softwares are located in the Award HDD Service Routine (1NT 13h). It may be failed
to access a HDD with LBA (LARGE) mode selected if you are running undera Operating
System which replaces the whole 1NT 13h. UNIX operating systems do not support either
LBA or LARGE and must utilize the Standard mode. However UNIX can support drives

larger than 528MB.

4-10 HDD Low Level Format

Interleave

Select the interleave number of the hard disk drive you wish to perform low
level format. You may select from 1 to 8. Check the documentation that
came with the drive for the correct interleave number, or select 0 for utility
automatic detection.

Auto scan bad track

This allows the utility to scan first then format by each track.

Start

Press<Y>to start low level format.

4-11 Save & Exit Setup

The "SAVE & EXIT SETUP" option will bring you back to boot up procedure
with all the changes you just made which are recorded in the CMOS RAM.

4-12 Exit Without Saving

The "EXIT WITHOUT SAVING" option will bring you back to normal boot up
procedure without saving any data into CMOS RAM. All of the old data in the
CMOS will not be upduted.

TECHNICAL INFORMATION 5-1

Chapter 5

Technical Information

5-1 I/O & MEMORY MAP

MEMORY MAP
Address Range Size Description

[00000-7FFFF] 512K Conventional memory
[80000-9FBFF] 127K Extended Conventional memory
[9FC00-9FFFF] 1K Extended BIOS data area if PS/2 mouse is installed
[A0000-C7FFF] 160K Available for Hi DOS memory
[C8000-DFFFF] 96K Available for Hi DOS memory and adapter ROMs
[E0000-EEFFF] 60K Available for UMB
[EF000-EFFFF] 4K Video service routine for Monochrome & CGA adapter
[F0000-F7FFF] 32K BIOS CMOS setup utility
[F8000-FCFFF] 20K BIOS runtime service routine (2)
[FD000-FDFFF] 4K Plug and Play ESCD data area
[FE000-FFFFF] 8K BIOS runtime service routine (1)

I/O MAP
[000-01F] DMA controller.(Master)

[020-021] INTERRUPT CONTROLLER.(Master)
[022-023] CHIPSET control registers. I/O ports.
[040-05F] TIMER control registers.
[060-06F] KEYBOARD interface controller.(8042)
[070-07F] RTC ports & CMOS I/O ports.
[080-09F] DMA register.
[0A0-0BF] INTERRUPT controller.(Slave)
[0C0-0DF] DMA controller.(Slave)
[0F0-0FF] MATH COPROCESSOR.
[1F0-1F8 ] HARD DISK controller.
[278-27F] PARALLEL port 2.
[2B0-2DF] GRAPHICS adapter controller.
[2F8-2FF] SERIAL port 2.
[360-36F] NETWORK ports.
[378-37F] PARALLEL port 1.
[3B0-3BF] MONOCHROME & PARALLEL port adapter.
[3C0-3CF] EGA adapter.
[3D0-3DF] CGA adapter.
[3F0-3F7] FLOPPY DISK controller.
[3F8-3FF] SERIAL port 1.

5-2 CHAPTER 5

5-2 Time & DMA Channels Map

TIME MAP: TIMER Channel 0 System timer interrupt.

TIMER Channel 1 DRAM REFRESH request.
TIMER Channel 2 SPEAKER tone generator.

DMA CHANNELS : DMA Channel 0 Available.

DMA Channel 1 Onboard ECP (Option).
DMA Channel 2 FLOPPY DISK (SMC CHIP).

DMA Channel 3 Onboard ECP (default).
DMA Channel 4 Cascade for DMA controller 1.
DMA Channel 5 Available.
DMA Channel 6 Available.

DMA Channel 7 Available.

5-3 Interrupt Map

NMI : Parity check error.

IRQ (H/W) : 0 System TIMER interrupt from TIMER 0.

1 KEYBOARD output buffer full.
2 Cascade for IRQ 8-15.
3 SERIAL port 2.
4 SERIAL port 1.
5 PARALLEL port 2.
6 FLOPPY DISK (SMC CHIP).
7 PARALLEL port 1.
8 RTC clock.
9 Available.
10 Available.
11 Available.
12 PS/2 Mouse.
13 MATH coprocessor.
14 Onboard HARD DISK(IDE1) channel.
15 Onboard HARD DISK(IDE2) channel.

5-4 RTC & CMOS RAM Map

RTC & CMOS : 00 Seconds.

01 Second alarm.

02 Minutes.

03 Minutes alarm.
04 Hours.
05 Hours alarm.

06 Day of week.
07 Day of month.
08 Month.
09 Year.

0A Status register A.
0B Status register B.
0C Status register C.

0D Status register D.

0E Diagnostic status byte.

0F Shutdown byte.

10 FLOPPY DISK drive type byte.

11 Reserve.

12 HARD DISK type byte.

13 Reserve.

14 Equipment type.

15 Base memory low byte.

16 Base memory high byte.

17 Extension memory low byte.

18 Extension memory high byte.

19-2d

2E-2F

30 Reserved for ectension memory low byte.

31 Reserved for extension memory high byte.

32 DATE CENTURY byte.

33 INFORMATION FLAG.
35-3F Reserved.

40-7F Reserved for CHIPSET SETTING DATA.

TECHNICAL INFORMATION 5-3

5-4 CHAPTER 5

Appendix A: POST Codes

ISA POST codes are typically output to port address 80h.

POST(hex) DESCRIPTION
01-02

Reserved.

C0

03

04

05

06

07

C1

C5

08

09

Turn off OEM specific cache, shadow.

1.Initialize EISA registers (EISA BIOS only).

2.Initialize all the standard devices with default values Standard devices includes.

-DMA controller (8237).

-Programmable Interrupt Controller (8259).

-Programmable Internal Timer (8254).

-RTC chip.

Reserved

1.Keyboard Controller Self-Test.

2.Enable Keyboard Interface.

Reserved.

Verifies CMOS's basic R/W functionality.

Auto-detection of onboard DRAM & Cache.

Copy the BIOS from ROM into E0000-FFFFF shadow RAM so that POST will
go faster.

Test the first 256K DRAM.

OEM specific cache initialization(if needed).

0A

0B

1.Initialize the first 32 interrupt vectors with corresponding Interrupt handlers
Initialize INT no from 33-120 with Dummy (Suprious)
Interrupt Handler.

2.Issue CPUID instruction to identify CPU type.

3.Early Power Management initialization (OEM specific).

1.Verify the RTC time is valid or not.

2.Detect bad battery.

3.Read CMOS data into BIOS stack area.

4.PnP initializations including (PnP BIOS only):

-Assign CSN to PnP ISA card.

-Create resource map from ESCD.

5.Assign IO & Memory for PCI devices (PCI BIOS only).

POST(hex) DESCRIPTION

TECHNICAL INFORMATION 5-5

0C

0D

0E

0F

10

11

12-13

14

15

Initialization of the BIOS Data Area. (40:ON - 40:FF)

1.Program some of the Chipset's value according to Setup (Early Setup Value
Program).

2.Measure CPU speed for display and decide the system clock speed.

3.Video initialization including Monochromc, CGA and EGA/VGA. If no display
device found, the speaker will beep up.

1.Test video RAM (If Monochromc display device found).

2.Show messages including:

-Award Logo, Copyright string, BIOS Data code & Part No.

-OEM specific sign on messages.

-Energy Star Logo. (Green BIOS ONLY)

-CPU brand, type & speed.

-Test system BIOS checksum. (Non-Compress Version only)

DMA channel 0 test.

DMA channel 1 test.

DMA page registers test.

Reserved.

Test 8254 Timer 0 Counter 2.

Test 8259 interrupt mask bits for channel 1.

16

17

19

1A-1D

1E

1F-29

30

31

Test 8259 interrupt mask bits for channel 2.

Reserved.

Test 8259 functionality.

Reserved.

If EISA NVM checksum is good, exccute EISA initialization. (EISA BIOS only)

Reserved.

Detect Base Memory & Extended Memory Size.

1.Test Base Memory from 256K to 640K.

2.Test Extended Memory from 1M to the top of memory.

5-6 CHAPTER 5

POST(hex) DESCRIPTION
32

33-3B

3C

3D

3E

3F-40

BF

41

42

43

1.Display the Award Plug & Play BIOS Extension message (PnP BIOS only).

2.Program all onboard super I/O chips (if any) including COM ports, LPT
ports, FDD port ... according to setup value.

Reserved.

Set flag to allow users to enter CMOS Setup Utility.

1.Initialize Keyboard.

2.Install PS/2 mouse.

Try to turn on Level 2 cache.
Note : Some chipset may need to turn on the L2 cache in this stage. But
usually, the cache is turn on later in POST 61h.

Reserved.

1.Program the rest of the Chipset's value according to Setup (Later Setup Value
Program).

2.If auto-configuration is enabled, programmed the chipset with pre-defined
Values.

Initialize floppy disk drive controller.

Initialize Hard drive controller.

If it is a PnP BIOS, initialize serial and parallel ports.

44

45

46-4D

4E

4F

50

51

Reserved.

Initialize math coprocessor.

Reserved.

If there is any error detected (such as video, kb...), show all the error messages
on the screen and wait for user to press <F1> key.

1.If password is needed, ask for password.

2.Clear the Energy Star Logo (Green BIOS only).

Write all CMOS values currently in the BIOS stack area back into the CMOS.

Reserved.

POST(hex) DESCRIPTION

TECHNICAL INFORMATION 5-7

52

53

60

61

1.Initialize all ISA ROMs.

2.Later PCI initializations (PCI BIOS only).

-Assign IRQ to PCI devices.

-Initialize all PCI ROMs.

3.PnP Initialzations. (PnP BIOS only)

-Assign IO, Memory, IRQ & DMA to PnP ISA devices.

-Initialize all PnP ISA ROMs.

4.Program shadows RAM according to Setup settings.

5.Program parity according to Setup setting.

6.Power Management Initialization.

-Enable/Disable global PM.

-APM interface initialization.

1.If it is NOT a PnP BIOS, initialize serial and paralled ports.

2.Initialize time value in BIOS data area by translate the RTC time value into
a timer tick value.

Setup Virus Protection (Boot Sector Protection) functionality according to Setup
setting.

1.Try to turn on Level 2 cache.
Note : if L2 cache is already turned on in POST 3D, this part will be skipped.

2.Set the boot up speed according to Setup setting.

3.Last chance for Chipset initialization.

4.Last chance for Power Management initialization (Green BIOS only).

5.Show the system configuration table.

62

1.Setup daylight saving according to Setup value.

2.Program the NUM Lock, typematic rate & typematic speed according to Setup
setting.

63

1.If there is any changes in the hardware configuration, update the ESCD
information (PnP BIOS only).

2.Clear memory that have been used.

3.Boot system via INT 19H.

FF

System Booting. This means that the BIOS already past the control right to the
operating system.

Unexpected Errors:
POST(hex) DESCRIPTION

B0

B1

If interrupt occurs in protected mode.

Unclaimed NMI occurs.

5-8 CHAPTER 5

Appendix B: I/O Connectors

JP13 : PS/2 Mouse Connector:

1

5

Pin Signal Name

1 Data (Red Wire)

2 Clock (Blue Wire)
3 GND (Green Wire)
4 NC
5 VCC (Yellow Wire)

JP10/COM1, JP11/COM2 : Serial Ports Connector

1

5

6

10

Signal Name Pin Pin Signal Name

DCD
SIN
SOUT
DTR
GND

1 6 DSR
2 7 RTS
3 8 CTS
4 9 RI
5 10 NC

J8 : Parallel Port Connector

1 6

13

26

Signal Name Pin Pin Signal Name

STROBE­Data Bit 0
Data Bit 1
Data Bit 2
Data Bit 3
Data Bit 4
Data Bit 5
Data Bit 6
Data Bit 7
ACJ­BUSY
PE

SLCT

1 14 AUTO FEED­ 2 15 ERROR­ 3 16 INIT­ 4 17 SLCT IN­ 5 18 Ground
6 19 Ground
7 20 Ground
8 21 Ground
9 22 Ground
10 23 Ground
11 24 Ground
12 25 Ground
13 26 NC

J7 : Floppy Disk Connector

Signal Name Pin Pin Signal Name

TECHNICAL INFORMATION 5-9

1 2

33 34

Ground
Ground

Ground

Ground
Ground
Ground
Ground
Ground

Ground

Ground
Ground
Ground
Ground

Ground

Ground
Ground
Ground

J5/J6 : Primary, Secondray IDE Connector

1 2

39 40

Signal Name Pin Pin Signal Name

Reset IDE
Host Data 7
Host Data 6
Host Data 5
Host Data 4
Host Data 3
Host Data 2
Host Data 1
Host Data 0
Ground
DRQ3
I/O Write­I/O Read­IOCHRDY
DACK3­IRQ14
Addr 1
Addr 0
Chip Select 0­Activity

1 2 FDHDIN
3 4 Reserved
5 6 FDEDIN
7 8 Index­ 9 10 Motor Enable
11 12 Drive Select B­13 14 Drive Select A­15 16 Motor Enable
17 18 DIR­19 20 STEP­21 22 Write Data
23 24 Write Gate
25 26 Track 00­27 28 Write Protect­29 30 Read Data­31 32 SIDE 1 SELECT­33 34 Diskette

1 2 Ground
3 4 Host Data 8
5 6 Host Data 9
7 8 Host Data 10
9 10 Host Data 11
11 12 Host Data 12
13 14 Host Data 13
15 16 Host Data 14
17 18 Host Data 15
19 20 Key
21 22 Ground
23 24 Ground
25 26 Ground
27 28 BALE
29 30 Ground
31 32 IOCS16­33 34 Ground
35 32 Addr 2
37 38 Chip Select 1­39 40 Ground

5-10 CHAPTER 5

ATX Power Supply Connector:

Signal Name Pin Pin Signal Name

11

20

1

10

CN1: USB Connector:
1

3.3V

-12.0V
GND
PS-ON
GND
GND
GND

-5.0V

5.0V

5.0V

USB Port 1

11
12
13
14
15
16
17
18
19
20

10

1
2
3
4
5
6
7
8
9

3.3V

3.3V
GND

5.0V
GND

5.0V
GND
PW-OK
5VSB

12.0V

USB Port 2

PS/2 Mouse

1

Figure 5-1 USB Port Adapter