EPOX EP-5ATXA-M 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.
EP-5ATXA-M
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
Staticelectricitycanseverelydamageyourequipment. Handle theEP-5ATXA-M
andanyotherdeviceinyoursystemwithcareandavoidcontactwithcomponentsonthe
card.Alwaysworkonanantistaticsurfacetoavoidpossibledamagetothecardfrom
staticdischarge. Thepackingmaterialplacedonatabletopmakesagoodantistatic
worksurface.WeassumenoresponsibilityforanydamagetotheEP-5ATXA-M
mainboardthatresultsfromfailuretofollowinstallationinstructionsorfailuretoobserve
safetyprecautions.
CAUTION
TheEP-5ATXA-Mmainboardissubjectto
damagebystaticelectricity. Always
observethe handlingprocedures.

Package Checklist
Please make sure your package which should include all items listed
below. If you find any item damaged or missing items, please contact
your supplier.
One IDE ribbon cable
One floppy ribbon cable
One manual
One Mainboard

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
EP-5ATXA-MLayout.............................................. 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.

Introduction1-1
Chapter 1
Introduction
R
R
TheEP-5ATXA-Mmainboardis ahighperformancesystemhardware
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 ATX
form-factorthatis208mmx305mmwithafour-layerdesigntechnology.
Specification
Intel82430TXPCIsetchipset.
Intel Pentium Processor, Pentium Processor with MMXTM technology,
AMDK5/K6andCyrix6x86/6x86L/6x86MXoperatingat90~333MHz(Easy
CPU CLK Setting JP3: One Jumper Only) with 321ZIFsocket7provides
scalability to accept faster processors in the future.
Supports an onboard Switching Voltage Regulator to increase CPU and
systemsreliability.
SupportsCPUVcoreVoltage2.0V/2.2V/2.8V/2.9V/3.2Vselection.
Supports up to 256 MegaBytes of DRAM (a minimum of 8 MB) on board (72-
PinSIMMx2and168-PinDIMMx3).BIOSwillautometicallydetectand
configureFP DRAM,EDODRAM andSDRAM(Refer toChapter 2-4,
SystemMemoryConfiguration).
Supports Onboard Pipelined burst synchronous L2 Write Back Cache. The
cachememoryis512KB(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)devicesandUltraDMA33 Harddiskfor
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-ON and Mouse Power-ON function.
R

1-2 EP-5ATXA-M
Software power-down when using Windows 95.
Supports Resume by Alarm-Allows your system to turn on at a preselected time.
Supports USDM(Unifed System Diagnostic Manager) to monitor system CPU
Fan speed, chassis Fan Speed, CPU temperature, System temperature, CPU
Voltage and power Supply Voltage in Windows 95 or NT 4.0.
Supports YAMAHA YMF-715 Audio with 3D sound.
Supports the system power LED lights when the system is powered on and
blinks in sleep or suspend mode.
Supports the CPU chassis Fan Stop when the system in sleep or suspend
mode.(The Fan power must be Supplies by onboard J4, J5, J6 connector)
Supports the Universal Serial Bus(USB) Connector onboard.
UtilizesaLithiumbatterywhichprovidesenvironmentalprotectionand
longerlife-time.
Supports a CPU temperature alarm sound Effect so that when CPU's cooling fan
is malfunc tioning or CPU overheats, CPU speed 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.
R
RR

Introduction1-3
Pentium
processor
PIIX4
I/OBridge
324BGA
IDE HDD
Graphics
Port_A
Port_B
>
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
Figure 1-2 System Block Diagram
IDE CD-ROM
Audio

Hardware Design 2-1
Chapter 2
Hardware design
2-1 Overview
TheEP-5ATXA-MisdesignedwithIntel82430TXPCIsetchipsetwhichis
developed by Intel Corporation to fully support Pentium Processor PCI/ISA system.
TheIntel82430TXPCIsetchipsetcanincreaseintegrationandimproveperformance
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,
two16-byteFIFOserialportsandanEPP/ECPcapableparallelport.The EP-5ATXA-
Mlayout is shown in the previous page for user's reference. Care must be taken
wheninserting memory modules,insertingCPU or evenplugging PCI card intothe
associated slots to avoid damaging any circuits or sockets on board. A cooling fan is
stronglyrecommendedwheninstalling P54C/P54CTB/P55C(MMX)/K5/K6/6x86
(6x86L)/6x86MXprocessor due to possibleoverheat. The EP-5ATXA-M supports
CPUtemperaturemonitorandalarmtopreventCPU'scoolingfanfrommalfunctionor
CPUoverheat. There is a heat sensor to monitor CPU temperature. If CPU overheats,
then speaker will alarm and CPU will slow down to save your data and shutdown the
system.
TheEP-5ATXA-Msupportsaminimumof8MB ofsystem memoryand a
maximumof 256MBwith 512KBsynchronous SRAMonboard toincrease system
performance.
TheEP-5ATXA-Msupportsstandard Fast Page,EDO(Extended Data Outor
Hyper Page Mode) or synchronous DRAM.The EP-5ATXA-Mprovides two 72-
pinSIMM and three 168-pin DIMM sites for memory expansion. Each socket sup-
ports1Mx32(4MB),2Mx32(8MB),4Mx32(16MB),and8Mx32(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 three 168-pin DIMM sites
to support 3.3V (power level) Unbuffered Synchronous DRAMs(SDRAM) and two
72-pinSIMMsitestosupport5.0V(powerlevel)FastPageandEDODRAM.Memory
paritygenerationandcheckingarenotsupported. (DRAMModulesmaybeparity[x
36]ornon-parity[x32].
TheEP-5ATXA-M supportstwoOnboardPCIIDEconnectorsthatcansupportPIO
Mode/Ultra DMA 33 device and automatically detect IDE harddisk type by BIOS
utility.
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2-2 EP-5ATXA-M
The EP-5ATXA-MsupportsAwardPlug&PlayBIOSfortheISAandPCIcards.The
BIOS can be located in Flash EPROM. The advantage of having Flash EPROM is
much easier to replace BIOS code if necessary.
TheEP-5ATXA-MhasbeendesignedwithATXform-factorwithATXpower
connector. The mainboard layout and system block diagram are shown in Figure 1-1
andFigure2-1.
TheEP-5ATXA-Mhasbeendesigned the hardware monitoring to allows you to
monitor various aspects of your system perations and status. These indlude fcatures
such as CPU temerature, system temperature, voltage and fan RPM's.
TheEP-5ATXA-MSupportsYamahaYMF715Bonboarddesign.Built-inthe
OPL3(FM-synthesizer),3DEnhancedController(3DSoundeffect)andSoundBlaster
Gamecompatibility.
TheEP-5ATXA-M

Hardware Design 2-3
Figure2-1
ATX Power Conn.
Winboand
83977F
M1 M2
PCI#3
PCI#2
PCI#1
PCI#4
<
BIOS
SLEEP SPEAKERTB-LED
G-LED RESET KEYLOCKHD-LED
PW-ON
EP-5ATXA-MLayout
FDD CONN.
Secondary IDE
IR CONN
5 1
JP3
125
26
BANK0
SIMM 2 SIMM 1
13
JP1
2
PIIX4
MTXC
SOCKET 7
Primary IDE
J3
J9
J2
FDD1
IDE1
J15
J6
64K*64
SRAM
COM1 PS/2
MOUSE
K/B
PRINTER PORT
COM2 USB
PORT
M3
YMF715B-S
13
JP13
15
JP2
610
BANK1 BANK2
BANK2
J4 J5
Line-Out
Line-In
Mic
IDE2

2-4 EP-5ATXA-M
2-2ConnectorsandJumpers
This section describes all of the connectors and jumpers equipped in the mainboard.
Please refer toFigure 2-1 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.
27 28
1 2
JP3:CPUClockRateSelect.(Easy-Setting-Single-Jumper)
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.
*
Pentium Bus Freqency
PentiumMMX x Cyrix 6x86(L) / 6x86MX
AMDK5 / K6 Multiplier IBM 6x86(L)/6x86MX
JP3
1-2 90MHz 60MHz x 1.5
3-4 100MHz 66MHz x 1.5
5-6 120MHz 60MHz x 2 6x86/L-PR150
7-8 133MHz 66MHz x 2 6x86/L/MX-PR166
9-10 75MHz x 2 6x86/L/MX-PR200
11-12 150MHz 60MHz x 2.5 6x86MX-PR166
13-14 166MHz 66MHz x 2.5 6x86MX-PR200
15-16 188MHz 75MHz x 2.5 6x86MX-PR233
17-18 200MHz 66MHz x 3 6x86MX-PR233
19-20 225MHz 75MHz x 3 6x86MX-PR266
21-22 233MHz 66MHz x 3.5 6x86MX-PR266
23-24 266MHz 66MHz x 4
25-26 300MHz 66MHz x 4.5
27-28 333MHz 66MHz x 5
*
*
*
*
*
*
*
JP2 CPUVcorevoltageselectionforPentiumMMX/AMDK6/Cyrix
6x86Lor6x86MX
1-6 : 2.0V for AMD K6 fast processor (Reserved)
2-7 :2.8VforPentiumMMXorCyrix6x86L
3-8 :2.9VforAMDK6-PR166/PR200orCyrix6x86MX
4-9 :3.2VforAMDK6-PR233/PR266
5-10 : 2.2V for AMD K6 fast processor(Reserved)
510
16 2.0V
2.8V
3.2V
(Default)
2.2V
2.9V

Hardware Design 2-5
KeyLock -Keyboardlockswitch&PowerLEDconnector.
1.PowerLED(+)
2.N/C
3.GND
4.Keylock
5.GND
Speaker - connect to the system's speaker for beeping.
7.Speaker
8.N/C
9.GND
10.VCC
Reset - Close to restart system.
TurboLEDindicator-LEDONwhenahigherspeedisselected.
HarddiskLEDindicator -LEDONwhenOnboardPCIIDE
Harddisks activites.
1
5
+
+
7
10
J4
*ThepowerLEDlightswhen
the system is powered on
andblinksinSLEEPMODE
(Suspend mode).
J9 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.
1.GND
2.+12V
3.RPM'sSonsor
J4 ThePowerSupply(+12V)oftheCPUCooling/Powersupply/Chassis FAN:
1
3
J5
J6

2-6 EP-5ATXA-M
I/O back panel connector:
JP1 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
5
1.VCC
2.NC
3.IRRX
4.GND
5.IRT
1
J3 IrDA/ASKIRCONNECTOR:
JP13 KeyboardPowerONfunction:
1-2:Enabled
(For the details, please refer to Chapter 3-1: Keyboard
Power On Function.)
2-3:Disabled(Default)
3
1
PS/2Mouse
PS/2KB USB1 USB2 LPT1 COM1 COM2 Game Port
Line-Out Line-In Mic

Hardware Design 2-7
2-3 Real Time Clock Battery Replacement
ThebatterycanbereplacedbyaSanyo/PanasonicCR2032,or
otherequivalentcoinlithiumbattery.Pleasefollowthestepsbelowto
replacethebattery.
+
+
+
+
+
1.Remove 2.Insert
1
2
3
4
1
2
3
+
+
2-4SystemMemoryConfiguration
The EP-5ATXA-Msupports different types of settings for the system memory.
Thereis not jumperforSDRAM hardware settingis for memory configuration.The
followingfigures show all possible memory combinations.

2-8 EP-5ATXA-M
DIMM(M1) DIMM2(M2) DIMM3(M3) SIMM1,SIMM2 TOTALMemery
(BANK 0) (BANK 1) (BANK 2) (BANK2) MAX.=256MB
SDRAM SDRAM SDRAM
8MB, 16MB 8MB, 16MB 8MB, 16MB Empty =
32MB 32MB 32MB
SDRAM SDRAM EDO/FP DRAM
8MB, 16MB 8MB, 16MB 4MB, 8MB
Empty =
32MB 32MB 16MB, 64MB
SDRAM EDO/FD DRAM
8MB, 16MB 4MB, 8MB
Empty Empty =
32MB 16MB, 64MB
SDRAM EDO/FD DRAM
8MB, 16Mb 4MB, 8MB
Empty Empty =
32MB 16MB, 64MB
SDRAM SDRAM
8MB, 16MB 8MB., 16MB
Empty Empty =
32MB 32MB
SDRAM SDRAM
[ 64MB, 128MB] [64MB, 128MB] Empty Empty =
NOTE: 1.DIMM3(Bank2)&SIMM1/SIMM2(Bank2)areshared.Thismeansthatif
you use SIMM1 & 2 you can not use DIMM3(M3).
2.DIMM module specification is 3.3V / unbuffered.
BANK 0
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
MemoryConfigurationTable
SIMM1
SIMM2
DIMM2
DIMM1
>
>
>BANK 1
x 1 x 1 x 1
x 1 x 1 x 2
DIMM3 BANK 2
>3.3V Synchronous DRAM
or 3.3V FP/EDO DRAM
x 1 x 2
x 1 x 2
x 1 x 1

Hardware Design 2-9
DIMM Module Installation
Figure 2-2 displays the notch marks and what they should look like on your
DIMM memory module.
DIMMs have 168-pins and two notches that will match with the onboard
DIMM socket. DIMM modules are installed by placing the chip firmly into
the socket at a 90 degree angle and pressing straight down (figure 2-3) until
it fits tightly into the DIMM socket (figure 2-4).
CENTER KEY ZONE
(3.3 V DRAM)
LEFT KEY ZONE
(UNBUFFERED)
Figure 2-2
Figure 2-3
DIMM Module clip before installation
Figure 2-4
DIMM Module clip after installation
To remove the DIMM module simply press down both of the white clips on
either side and the module will be released from the socket.

2-10 EP-5ATXA-M
*EP-5ATXA-M Supports and extends many memory configurations on its 2 SIMM
and 2 DIMM sites. The memory size of any configuration can be combined
flexibly.BIOSwilldetectyourmemoryconfigurationsandsizesautomaticallly.
*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 EP-5ATXA-Msupports512KBpiplinedburstsynchronous
SRAM.
64K*64
U17
U16
DATA SRAM
TAG
SRAM
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.
R

Hardware Design 2-11
2-6IntegratedPCIBridge
TheEP-5ATXA-Mutilizes Intel430TXPCIsetchipsettosupportIntelPentium
Processor PCI/ISA system. The Intel 82430TX PCIset chipset consists of one
82439TXsystemcontroller(MTXC)andone82371ABPCIISA/IDEAccelerator
(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
ArbitrationSchemeMinimizesArbitrationOverhead.The82371AB(PIIX4)supports
PCISpecificationRevision2.1CompliantandcontainsaUniversalSerialBus
interface with both host and hub control functions. EP-5ATXA-M 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 EP-5ATXA-MadaptsthePCIauto-configurationwith thesystem BIOSSetup
utility. When the system is turned on after adding a PCI add-in card, the BIOS
automaticallyconfigureinterrupts, 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
Overview
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
TheEP-5ATXA-MisbaseonATXform-factorwithaboardsize8.2"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