EPOX P55-TX 2 User manual

TRADEMARK
All products and company names are
trademarks or registered trademarks of
their respective holders.
The specification is subject to change without notice.
P55-TX 2
ISA PCI MainBoard
with Onboard PCI IDE and Super Multi-I/O.
82430TX PCIset
V023

User Notice
Nopartofthisproduct,includingtheproductandsoftwaremaybereproduced,transmit-
ted,transcribed,storedinaretrievalsystem,ortranslatedintoanylanguageinanyform
byanymeanswiththeexpresswrittenpermissionofEPoXComputerCompany(herein-
afterreferredtoasEPoX)exceptdocumentationkeptbythepurchaserforbackup
purposes.EPoXprovedesthismanual"asis"withoutwarrantyofanykind,eitherexpress
orimplied,includingbutnotlimitedtotheimpliedwarrantiesorconditionsof
merchantabilityorfitnessforaparticularpurpose. InnoeventshallEPoXbeliablefor
anylossorprofits,lossofbusiness,lossofuseordata,interruptionofbusinessorfor
indirect,specialincidental,orconsequentialdamagesofanykind,evenifEPoXhasbeen
advisedofthepossibilityofsuchdamagesarisingfromanydefectorerrorinthemanual
orproduct. EPoXmayreviewthismanualfromtimetotimewithoutnotice. Forupdated
BIOS,drivers,orproductsreleaseinformationyoumayvisitEPoX’shomepageat:
http://www.epox.com.
Productsmentionedinthismanualarementionedforidentificationpurposesonly. Prod-
uctnamesappearinginthismanualmayormaynotberegisteredtrademarksofcopy-
rightsoftheirrespectivecompanies.
Theproductnameandrevisionnumberarebothprintedonthemainboarditself.
©Copyright©1997byEPoXComputerCo.,Ltd.Allrightsreserved.
HandlingProcedures
Staticelectricity can severely damageyour equipment. Handle the P55-TX 2 and
anyotherdeviceinyoursystemwithcareandavoidcontactwithcomponentsonthe
card.Alwaysworkonanantistaticsurfacetoavoidpossibledamagetothecardfrom
staticdischarge. Thepackingmaterialplacedonatabletopmakesagoodantistatic
worksurface.WeassumenoresponsibilityforanydamagetotheP55-TX2mainboard
thatresultsfromfailuretofollowinstallationinstructionsorfailuretoobservesafetypre-
cautions.
CAUTION
TheP55-TX 2 mainboard is subject to
damagebystaticelectricity. Always
observethe handlingprocedures.

Package Checklist
Please make sure your package contain all items listed below before
your installation. If you find any damaged items or missing items,
please contact your retailer.
One IDE ribbon cable
One floppy ribbon cable
One manual
One Mainboard
One PS/2 to AT Keyboard Connector adapter

Contents
page
Chapter1-Introduction................................................... 1-1
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 Form -Factor Overview
3-1 ExternalMadem Ring-in Power-On and Keyboard Power-
On Functions ................................................ 3-3
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 WithoutSaving ....................................................4-20
Chapter5-TechnicalInformation....................................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
AppendixA: POSTCodes...................................................................5-4
AppendixB: I/OConnectors...............................................................5-8
SystemBlockDiagram ............................................. 1-3
P55-TX2Layout...................................................... 1-4

LOAD SETUP DEFAULT
ROM PCI/ISA BIOS
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
Load SETUP Default (Y/N)? Y
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
1.The"LOADSETUPDEFAULTS"functionloadsthesystemdefaultdatadirectlyfrom
ROM and initializes the associated hardware properly. This function is necessary
when you accept this mainboard, or the system CMOS data will corrupt.
Read me first
2.KBPO(KeyBoardPower On) Function : There is a basic requirement that the
" +5V SB" power of the ATX power supply must be > = 0.1A (100mA).
Pleaserefer to chapter 3 -1 fordetail.

Introduction 1-1
Chapter 1
Introduction
R
R
The P55-TX 2mainboard is a high performance system hardware based
on Intel Pentium processor and is equipped with four PCI slots, four stan-
dard ISA slots, a PnP Super I/O controller and two dual-port PCI-IDE connec-
tors for the future expansion. The hardware dimension is an ATX form-factor
thatis208mmx305mmwithafour-layerdesigntechnology.
Specification
Intel82430TXPCIsetchipset.
Intel Pentium Processor, Pentium Processor with MMXTM technology,
AMDK5/K6andCyrix6x86/6x86L/6x86MXoperatingat100~333MHz
with 321ZIF socket 7 provides scalability to accept faster processors in the
future.
Supports an onboard Switching Voltage Regulator to increase CPU and
systemreliability.
SupportsCPUVcoreVoltage2.0V/2.1V/2.8V/2.9V/3.2Vselection.
Supports up to 256 MegaBytes of DRAM (a minimum of 8 MB) on board (72-
PinSIMMx4and168-PinDIMMx2).BIOSwillautometicallydetectand
configureFP DRAM,EDODRAM andSDRAM(Refer toChapter 2-4,
SystemMemoryConfiguration).
Supports Onboard Burst/Pipelined burst synchronous L2 Write Back
Cache.Thecachememoryis512KB(64KB*32SRAM).
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
Mode3andMode4devices.
Supports ATAPI(e.g.CD-ROM)devicesandUltraDMA33Harddiskfor
bothIDE interfaces.
Supports 1 floppy port, 1 parallel port (EPP,ECP port), and 2 serial ports
(16550FastUARTcompatible)withPnPSuperI/Ochip.
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/
OFFcontroller,aRing-in(ExternalModemonly)Power-ONandaKeyboard
Power-ONfunction.
R

1-2 P55-TX 2
Supports a USB connector.
UtilizesaLithiumbatterywhichprovidesenvironmentalprotectionand
longerlife-time.
Supports a CPU temperature alarm so that when CPU's cooling fan is malfunc-
xtioningor CPU overheats, CPU will 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.

Introduction 1-3
Pentium
processor
PIIX4
I/OBridge
324BGA
IDE HDD
Graphics
Port_A
Port_B
>
IDE CD-ROM
Universal Serial Bus
ISA Slots
R
>
PCI Slots
>
>
PB
SRAM
TAG <
<
Control
TAG Control
PCI BUS
Super
I/O
Serial 1
Serial 2
FDD
Printer
>
>
HOST BUS
BIOS
Flash EPROM
<MD[63:0]>
MTXC
HOSTBridge
324BGA
MA[11:0]
CONTROL
Keyboard
BIOS
Figure 1-2 System Block Diagram

1-4 P55-TX 2
Figure 1-1
ATX Power Conn.
COM1
PS/2
MOUSE
K/B
CONN.
PRINTER
CONN.
COM2
USB Conn.
CN1
<
Winboand
83877F
DIMM1
DIMM2
PCI#3
PCI#2
PCI#1
PCI#4
<
Keyboard BIOS
SLEEP SPEAKERTB-LED
G-LED RESET KEYLOCKHD-LEDPW-ON
P55-TX 2 Layout
FDD CONN.
Secondary IDE
IR CONN 5 1
JP4
125
26
BANK1
BANK2
BANK0 BANK1
SIMM 4
SIMM 3
SIMM 2
SIMM 1
1
3
1
3
JP8
JP2
2
PIIX4
MTXC
BIOS
SOCKET 7
Primary IDE
J4 JP9 JP14
J6
J5
J7
1 5
6 10
J18
1
JP1
JP10
JP13
JP12
J8
J15
<
TAG
1
3
J9
J10
SeePage
2-4
SeePage
2-6
SeePage
2-5 SeePage
2-3
SeePage
2-4
SeePage
2-5
JP11
64K*64
SRAM
3

Hardware Design 2-1
Chapter 2
Hardware design
2-1 Overview
TheP55-TX 2is designed with Intel 82430TX PCIset chipset which is developed
by Intel Corporation to fully support Pentium Processor PCI/ISA system. The Intel
82430TXPCIsetchipsetcanincreaseintegrationandimproveperformancedesigns.
Thechipset providesan integratedIDEcontroller withtwo highperformanceIDE
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-byteFIFO serial portsandan EPP/ECP capable parallelport. The P55-TX2layout
is shown in the previous page for user's reference. Care must be taken when insert-
ing 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
recommendedwheninstalling P54C/P54CTB/P55C(MMX)/K5/K6/6x86(6x86L)
processor due to possible overheat. The P55-TX 2 supports CPU temperature monitor
andalarmtopreventCPU'scoolingfanfrom malfunctionor CPUoverheat.There isa
heatsensorto monitorCPUtemperature. IfCPUoverheats,thenspeakerwillalarm
and CPU will slow down to save your data and shutdown the system.
TheP55-TX2supportsaminimumof8MBofsystemmemoryandamaximumof
256MB with 512KB synchronous SRAM onboard to increase system performance.
The P55-TX 2supports standard Fast Page, EDO (Extended Data Out or Hyper
Page Mode) or synchronous DRAM.The P55-TX 2provides four 72-pin SIMM
and two 168-pin DIMM sites for memory expansion. Each socket supports 1M x 32
(4MB),2Mx32(8MB),4Mx32(16MB),and8Mx32(32MB)single-sidedordouble-
sided memory modules. The memory timing requires 70 ns for Fast Page devices or 60
nsfor EDO DRAM. This mainboard hastwo168-pin DIMM sites to support3.3V
(powerlevel) Unbuffered Synchronous DRAMs(SDRAM) or5.0V(power level) Fast
PageandEDODRAM.Memoryparitygenerationandcheckingarenotsupported.
(DRAMModulesmaybeparity[x36]ornon-parity[x32].
The P55-TX 2 supportstwoOnboardPCIIDEconnectorsthatcansupportPIO
Mode/Ultra DMA 33 device and automatically detect IDE harddisk type by BIOS
utility.
R

2-2 P55-TX 2
The P55-TX 2supports 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-TX2has been designed with ATX form-factor with ATX power connector.
The mainboard layout and system block diagram are shown in Figure 1-1 and Figure
1-2.

Hardware Design 2-3
2-2ConnectorsandJumpers
This section describes all of the connectors and jumpers equipped in the mainboard.
Please refer toFigure 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.
Speaker - connect to the system's speaker for beeping.
7.Speaker
8.N/C
9.GND
10.VCC
Reset - Close to restart system.
1
5
+
+
1.Power LED(+)
2.N/C
3.GND
5.GND
4.Keylock
+
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)
PowerSavingLEDindicator- LEDONwhenthesystemisinany
saving mode.
TurboLEDindicator-LEDONwhenahigherspeedisselected.
HarddiskLEDindicator -LEDONwhenOnboardPCIIDE
Harddisks activate.
7
10

2-4 P55-TX 2
1.GND
2.+12V
3.GND
JP1 ThePowerSupply(+12V)oftheCPUCooling FAN:
1
3
J10/J9 EPROMBIOSSelection:
1-2:12VFlashEPROM(Intel).
2-3:5VFlashEPROM.(SST,Winbond).(Default)
JP8 ClearCMOS:
1-2:Normaloperation(Default)
2-3:ClearCMOSValues
This setting allows users to clear current CMOS data and to return
to the initial data by setting the jumper to 2-3 when the 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 for avoiding damaging befor clearing
CMOSdata.
3
1
JP2 KeyboardPowerONfunction:
1-2:Enabled
(For the details, please refer to Chapter 3-1: Keyboard
Power On Function.)
2-3:Disabled(Default)
3
1
5
1.VCC
2.NC
3.IRRX
4.GND
5.IRT
1
J4 IrDA/ASKIRCONNECTOR:
JP7 DIMM1,DIMM2(168PIN)DRAMTYPESelect:
1-2,3-4:Support 3.3V SDRAM(Default)
5-6,7-8:Support5VEDO/FPDIMMTYPEDRAM
71
2
1
3
8
JP9 SystemPowerON/OFFSwitch(ForATXPowerSuppplyConnector)
Pressing the button once will switch the system on and enter the
SLEEPMODE(Suspendmode).WhileintheSLEEPMODE,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.

Hardware Design 2-5
1615
CN1 USBCONNECTOR:
Reservedfor USB port Adapter
(refertoAPPENDIXB:I/OConnectors)
12
I/O back panel connector:
COM1 PS/2
Keyboard
PS/2
Mouse parallel port COM2
25 26
1 2
JP4:CPUClockRateSelect.(EasyOneJumperSettingOnly)
(Default)
Pentium Processor
P54C / P55C Cyrix6x86 / 6x86L / M2
AMDK5/K6 IBM 6x86
1-2 66/100MHz(66x1.5)
3-4 60/120MHz(60x2) 6x86-PR150+(120MHz)
5-6 66/133MHz(66x2) 6x86-PR166+(133MHz)
7-8 75/150MHz(75x2) 6x86-PR200+(150MHz)
9-10 60/150MHz(60x2.5) 6x86MX-PR166(M2)
11-12 66/166MHz(66x2.5) 6x86MX-PR200(M2)
13-14 75/188MHz(75x2.5) 6x86MX-PR233(M2)
15-16 66/200MHz(66x3) 6x86MX-PR233(M2)
17-18 75/225MHz(75x3) 6x86MX-PR266(M2)
19-20 66/233MHz(66x3.5) 6x86MX-PR266(M2)
21-22 66/266MHz(66x4)
23-24 60/300MHz(60x5)
25-26 66/333MHz(66x5)
R
CPU
JP4
*
¡**
*
Thesejumper settings are reservedfor thefuture CPU
versions. When the future CPU versions are ready and
suitable for this mainboard, these jumper settings will be
correctly updated.
*
*
*
*

2-6 P55-TX 2
510
1
62.0V
3.2V
2.9V
2.8V
J18 CPUVcorevoltageselectionforPentiumMMX/AMDK6/Cyrix6X86L
1-6 : 2.0V for AMD K6 fast processor (Reserved)
2-7 :2.8VforPentiumP55C(MMX)/Cyrix6X86L(DualVoltage)
3-8 :2.9VforAMDK6PR166/PR200or6X86MX-PR166/PR200/
PR233/PR266(DualVoltage)
4-9 :3.2VforAMDK6PR233/PR266(DualVoltage)
5-10 : 2.1V for AMD K6 fast processor (Reserved)
2.1V

Hardware Design 2-7
2-3 Real Time Clock Battery Replacement
The battery can be replaced by a Sanyo / Panasonic CR2032, or
otherequivalent coin lithium battery.Pleasefollow the steps below to
replace the battery.
+
+
+
+
+
1.Remove 2.Insert
1
2
3
4
1
2
3
+
+

2-8 P55-TX 2
DIMM(M1) DIMM2(M2) SIMM1,SIMM2 SIMM3, SIMM4 TOTAL
(BANK 0) (BANK1) (BANK 2) (BANK1) Memory
SDRAM SDRAM EDO/FP DRAM MAX.-256MB
8MB, 16MB 8MB, 16MB 4MB, 8MB Empty =
32MB, 64MB 32MB, 64MB 16MB, 64MB
SDRAM EDO/FP DRAM EDO/FP DRAM
8MB, 16MB 4MB, 8MB 4MB, 8MB
Empty =
32MB, 64MB 16MB, 64MB 16MB, 64MB
SDRAM EDO/FP DRAM
8MB, 16MB 4MB., 8MB
Empty Empty =
32MB, 64MB 16MB, 64MB
SDRAM SDRAM
[ 64MB, 128MB] [64MB, 128MB] Empty Empty =
NOTE: 1.P55-TX 2 supports both Fast Page DRAM and EDO DRAM SIMMs, howe-
ver they cannot be mixed in the same memory bank.
2. DIMM module specification is 3.3V / unbuffered.
BANK 2 5V FP / EDO DRAM
2-4SystemMemoryConfiguration
The P55-TX 2 supports different types of settings for the system memory. Jumper
JP7forSDRAM hardwaresettingis formemoryconfiguration. Thefollowingfigures
show all possible memory combinations.
BANK 0
BANK 1 5V FP / EDO DRAM
3.3V Synchronous DRAM
or 3.3/5V FP/EDO DRAM
3.3V Synchronous DRAM
or 3.3/5V FP/EDO DRAM
MemoryConfigurationTable
SIMM1
SIMM3
SIMM2
SIMM4
DIMM2
DIMM1
>
>
>
>BANK 1
x 1 x 1 x 2
x 1 x 2 x 2
x 1 x 2

Hardware Design 2-9
LEFT KEY ZONE CENTER KEY ZONE
(3.3 V DRAM)
(UNBUFFERED)
The P55-TX 2supports two 168-pin DIMM module sockets to extend system
memorysize.Youcaninstall(5V,JP7,5-6,7-8Close)FastPage,EDOor(3.3V/
UNBUFFEREDJP71-2,3-4Close)SynchronousDRAM.
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 ProcessorSystem or5V FastPage, EDODRAM.
R
* P55-TX 2 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 detectyour memory configurations and sizesautomaticallly.
* The 70ns Fast Page Mode or 60ns EDO is necessary.
* "BANK"=64Bit=SIMM1,SIMM2 =DIMM1=DIMM2
2-5CacheMemoryConfiguration
The second level (L2) cache is installed in the mainboard to increase the system
performance. The P55-TX 2 supports 512KB burst and piplined burst synchronous
SRAM.
64K*64
U20
U22
DATA SRAM
TAG
SRAM

2-10 P55-TX 2
2-6IntegratedPCIBridge
The P55-TX 2 utilizes Intel430TXPCIsetchipset to support Intel Pentium Proces-
sor PCI/ISA system. The Intel 82430TX PCIset chipset consists of one 82439TX
systemcontroller(MTXC)andone82371ABPCIISA/IDEAccelerator(PIIX4)bridge
chip. It provides an interface which translates CPU cycle into PCI bus cycle and PCI
burstread/write capability.Inaddition, itprovidesa highperformancePCI arbiterand
supports four PCI Masters, Rotating Priority Mechanism, and Hidden Arbitration
SchemeMinimizesArbitrationOverhead.The82371AB(PIIX4)supportsPCISpecifi-
cationRevision 2.1Compliantand containsaUniversal SerialBusinterface withboth
host and hub control functions. P55-TX 2 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.
TherearefourinterruptsineachPCIslot:INTA#,INTB#, INTC#,andINTD#,since
the P55-TX 2adapts 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
inthesystem,modificationinthe ROMSETUPUTILITYbecomesnecessary.First,
enterPCICONFIGURATIONSETUPutilityfrom ROMSETUPUTILITYmainmenu
tosetthe"PCIIDEIRQMAPTO:ISA".
Second,youmustenterCHIPSETFEATURESSETUPUTILITYfromROMSETUP
UTILITYmainmenuandsetthe" OnboardPrimaryPCIIDE:DisabledandOnboard
SecondaryPCIIDE:Disable."WhenyouplugthePCI/ISAIDEcardintothesystem,
YoushouldDisableOnboardPrimaryandSecondaryPCIIDEfromCHIPSET
FEATURES SETUP UTILITYtoo.
When no paddle card and cable are used, 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(refertoPage3-12forcircuitdiagram).Theuserthenenters PCICONFIGURA-
TIONSETUPutilityfrom ROMSETUPUTILITYmainmenuandsetsthe" PCIIDE
IRQ MAP TO : PCI-Slot1" (It depends on the slot # where the Legacy card is
plugged).
R

Introduction 3-1
Chapter 3
ATX Form-Factor
Overvirw
Floppy / IDE
connectors close
to peripheral
bays 3 1/2"
Bay
Figure3-1:SummaryofATXchassisfeatures
Expandable I/
O
Single chassis fan
for system
ATX
Power
Sup-
ply
Full length
slots
CPU located near
Power Supply
Easy to access
SIMM memory
5 1/4"
Bay
TheP55-TX2is baseonATXform-factorwith aboard size8.2" x12" (208mmx
305mm). The ATX from-factor is essentially an enlarged baby-AT basedboard rotated
90 degrees within an ATX chassis and uses ATX power supply. The changes make
pentium processor able to locate away from the expansion slots and all onboard I/Os
able to hold full length add-on cards. The improved features of an ATX form-factor
from a baby-AT or LPX form-factor are shown as follows (see Figure 3-1).
1
2
3
4
5
Enhance the ease-of-use for the system
Supports full length cards for ISA and PCI slots
Install the SIMM/DIMM Memory easily
Install a CPU into the socket easily
Greate air-flow in the chassis with ATX power Supply
R