EPOX P55-BT 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-BT
ISA PCI MainBoard
with Onboard PCI IDE and Super Multi-I/O.
82430TX PCIset
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 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 PowerConnector
3-1 External Madem Ring-in Power-On and Keyboard Power
onFunctions................................................. 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 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-BTLayout ........................................................ 1-4

The"LOADSETUPDEFAULTS"functionloadsthesystemdefaultdatadirectlyfrom
ROMandinitializestheassociatedhardwareproperly. Thisfunctionisnecessarywhen
you accept this Mainboard, or the system CMOS data is corrupted.
LOAD SETUP DEFAULT
NOTE :
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

Introduction1-1
Chapter 1
Introduction
R
R
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
220mmx260mmwithafour-layerdesigntechnology.
Specification
Intel82430TXPCIsetchipset.
Intel Pentium Processor operating at100~ 333MHz (Easy CPU CLK
Setting JP4 : One Jumper Only) and P55C with321 ZIFsocket7 for
scalability to accept faster processors in the future.
Supports an onboard Switching Voltage Regulator to increase CPU and
System'sreliability.
SupportsCPUVcoreVoltage2.0V/2.8V/2.9V/3.2Vselection.
Supports up to 256 MegaBytes of DRAM(a minimum of 8 MB) on board(72-
PinSIMMx2,168-PinDIMMx2),BIOSautoFPDRAM,EDODRAMand
SDRAMconfiguration.(RefertoChapter 2-4SystemMemory Configuration)
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)devicesandUltraDMA33for both IDE
interface.
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,a Ring-in(ExternalModemonly)Power-OnandaKeyboard
Power-on function.

1-2 P55-BT
Supports a USB connector
Utilizesa Lithiumbatterywhich provides environmentalprotection and
longerlife-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.

Introduction1-3
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-BT
P55-BT Layout
PCI#1 PCI#3 PCI#4
K/B
CONN.
PCI#2
PowerConn.
<
USB Conn.
CN1 JP13
1
Note : Means Pin 1
Keyboard BIOS
Figure 1-1
DIMM 2 DIMM 1
COM2 COM1 SIMM 1
SIMM 2
PRINTER
FDD CONN.
Primary IDE Secondary IDE
1
25
2
26
JP4
1
3
J9
J10
JP2
Socket 7
BANK2
8 7
2 1
10 5
6 1
J18
HD-LED TB-LED G-LED RESETSLEEP SPEAKER KEYLOCK
ATX-PW-ON
IR CONN.
1
3
JP8
JP7
SeePage
2-4
JP1
SeePage
2-5
JP14 See Page
2-4
J4
JP9
SeePage
2-4
SeePage
2-6
SeePage
2-4
ATXPowerConn.
BANK1 BANK0
MTXC
PIIX4
64K*64
W83877

Hardware Design 2-1
Chapter 2
Hardware design
2-1 Overview
The P55-BTis designed with Intel 82430TX PCIset chipset which is developed by
INTELCorporation tofullysupport Pentium Processor PCI/ISAsystem. The Intel
82430TXPCIsetchipsetcan increaseintegrationandimproveperformancedesigns.
Thechipsetprovidesanintegrated IDE controller with twohigh performanceIDE
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
16Byte FIFO serialportsandanEPP/ECP capable parallelport.The P55-BTlayoutis
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
recommendedwheninstalling P54C/P54CTB/P55C(MMX)/K5/K6/6x86(6x86L)
processor due to possible overheat. The P55-BT supports CPU temperature monitor
andalarmtopreventCPU's coolingfanfrommalfunctionorCPUoverheat.WhenCPU
overheatsthere isaheat sensor tomonitorCPU temperature,thanspeaker will alarm
and CPU slow down to save you data and shutdown system.
TheP55-BTsupportsaminimumof8MBofSystemMemoryandamaximumof
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-pinDIMMsitesformemoryexpansion.Eachsocketsupports1Mx32(4MB),2M
x32(8MB),4Mx32(16MB),and8Mx32(32MB)single-sidedordouble-sidedmemory
modules. The memory timing requires 70 ns for Fast page devices or 60 ns for EDO
DRAM.This mainboard hastwo168-pinDIMMsites to support3.3V(powerlevel)
UnbufferedSynchronousDRAMs(SDRAM)or5.0V(powerlevel)FastPage,EDO
DRAM.Memoryparitygenerationandcheckingarenotsupported. (DRAMMod-
ulesmaybeparity[x36]ornon-parity[x32].
The P55-BT supportstwo OnboardPCIIDEconnectorsthat can support PIO Mode/
Ultra DMA 33 device and detect IDE harddisk type by BIOS utility automatically.
R

2-2 P55-BT
The P55-BTsupportsAward Plug &Play BIOS fortheISA and PCIcards. 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
2-2ConnectorsandJumpers
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.
Turbo LED indicator - LED ON when a higher speed is selected.
Harddisk LED indicator - LED ON when Onboard PCI IDE
Harddisks activites.
7
10

2-4 P55-BT
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 to back to
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.
3
1
JP2 KeyboardPowerONfunction:
1-2:Enabled
(For the details, please refer to Chapter 3-1: Keyboard
Power On Function)
2-3:Disabled
Note:WhenEnabledorDisabledtheKeyboardPowerONfunction.
Makesuretopulloutthepowercableordisconnectthe20-PIN
powersupply.
3
1
5.IRTX
5
1.VCC
2.NC
3.IRRX
4.GND
1J4 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
25 26
1 2
JP4:CPUClockRateSelect.(EasyOneJumperSettingOnly)
1615
CN1 USBCONNECTOR:
Reservedfor USB portAdapter
(refertoAPPENDIXB:I/OConnectors)
12
5
1
JP13 PS/2MOUSECONNECTOR:
1.Data(RedWire)
2.Clock(BlueWire)
3.GND(Green)
4.NC
5.VCC(Yellow)
(Default)
Pentium Processor
P54C / P55C Cyrix6x86/ 6x86L/M2
AMDK5/K6 IBM 6x86
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
R
CPU
JP4
*
¡**
*
These jumper settings are reserved for the future CPU
versions. When the future CPU versions are ready and
suitable for this mainboard, these jumper settings will be
correctly updated.
*
*
*
*

2-6 P55-BT
61
10 53.5V
3.2V
2.9V
2.8V
J18 CPUVcorevoltageselectionforPentiumMMX/AMDK6/Cyrix
6x86Lor6x86MX
1-6 : 2.0V for AMD K6 fast processor (Reserved)
2-7 :2.8VforPentiumP55C(MMX)/Cyrix6X86L(DualVoltage)
3-8 :2.9VforAMDK6PR166/PR200or6x86MX-PR166/PR200/
RP233/PR266(DualVoltage)
4-9 :3.2VforAMDK6PR233/PR266(DualVoltage)
5-10 :3.5VforPentiumP54C/P54CS/P54CTB/AMDK5/Cyrix
6X86(SingleVoltageforDualorSingleplane)
(Default)
2.0V

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

2-8 P55-BT
DIMM(M1) DIMM2(M2) SIMM1,SIMM2 TOTAL
(BANK 0) (BANK1) (BANK2) Memory
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
(3.3 V DRAM)
(UNBUFFERED)
The P55-BT supports two 168-pin DIMM module sockets to extend system
memorysize.Youcaninstall(5V,JP71-2,5-6,7-8Close)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 ProcessorSystemor5VFastPage,EDODRAM.
R
SDRAM SDRM EDO/FD DRAM MAX. =256MB
8MB, 16MB 8MB, 16MB 4M x 2 (8MB)
8M x 2 (16MB)
32MB 32MB 16M x 2 (64MB)
64MB, 128MB 64MB, 128MB Empty =
x1 x1 x 2 =
>
SIMM2
SIMM1 BANK 2 5V FP / EDO DRAM
DIMM2
2-4SystemMemoryConfiguration
The P55-BT supports different types of settings for the system memory. There is a
jumperJP7forSDRAMhardwaresettingneeded formemoryconfiguration.The
followingfigures showallpossible memorycombinations.
DIMM1 >
BANK 0
BANK 1
>
3.3V Synchronous DRAM
or 3.3V FP / EDO DRAM
3.3V Synchronous DRAM
or 3.3V FP / EDO DRAM
MemoryConfigurationTable

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 detectyourmemoryconfigurations 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-BT supports 512KB burst and piplined burst synchronous
SRAM.
64K*64
U18
U21
DATA SRAM
TAG
SRAM

2-10 P55-BT
2-6IntegratedPCIBridge
The P55-BT utilizes Intel430TX PCIsetchipset to support Intel Pentium Processor
PCI/ISA system. The Intel 82430TX PCIset chipset consists of one 82439TX system
controller(MTXC)andone82371ABPCIISA/IDEAccelerator(PIIX4)bridgechip.It
provides an interface which translates CPU cycle into PCI bus cycle and PCI burst
read/writecapability.Inaddition,itprovidesahighperformance PCIarbiterand
supports four PCI Masters, Rotating Priority Mechanism, and Hidden Arbitration
SchemeMinimizesArbitrationOverhead.The82371AB(PIIX4)supportsPCISpecifi-
cationRevision2.1Compliant and containsa UniversalSerialBusinterfacewithboth
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.
TherearefourinterruptsineachPCIslot:INTA#,INTB#,INTC#,andINTD#, 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
inthesystem,modificationinthe ROMSETUPUTILITYbecomesnecessary.First,
enterPCICONFIGURATIONSETUPutilityfrom ROMSETUPUTILITYmainmenu
tosetthe"PCIIDEIRQMAPTO:ISA".
Second,youmustenterCHIPSETFEATURESSETUPUTILITYfromROMSETUP
UTILITYmainmenuandsetthe" OnboardPrimaryPCIIDE:DisabledandOnboard
SecondaryPCIIDE:Disable."WhenyouplugthePCI/ISAIDEcardintothesystem,
YoushouldDisabledOnboardPrimaryandSecondaryPCIIDEfromCHIPSET
FEATURESSETUPUTILITYtoo.
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
Page3-12forcircuitdiagram).Theuserthenenters PCICONFIGURATIONSETUP
utilityfrom ROMSETUPUTILITYmainmenuandsetsthe" PCIIDEIRQMAPTO:
PCI-Slot 1" (It depends on the slot # where the Legacy card is plugged).
R

Introduction3-1
Chapter 3
ATX Power Connector
P55-BT
BOARD
ATX
POWER
SUPPLY
Figure3-3:SimpleATXPowerON/OFFController
System Power ON/OFF
Switch
JP9
>
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). Toimplementthebuilt-inRemoteON/OFFfunctiononATXpowersupply,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. RegardingtheSoft-OFF(comingfromtheP55-BTonboardcircuitcontrol-
ler), it is another way to turn off your system. Your system can be shut down
automatically by an operation system such as Windows 95.

3-2 P55-BT
3-1 ExternalModemRing-inPowerONandKeyboardPowerON
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
externalmodemtoCOM1orCOM2,theP55-BTmainboardallowsthemtoturnon
their system through the remote and host's dial-up control.
ExclusiveKeyboardPowerONFunction
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
supplywith0.72A(720mA). WithourP55-BTmainboard,the5.0VSBstandby
power only has to be > = 0.1A (100mA) then you can enjoy this unique benefit.
However,the ATX powersupplywhichis < 0.1(100mA)isstill applicableto
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.