Apollo P55KTX User manual

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.
LOAD SETUP DEFAULT
Read me first
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
2.KBPO(KeyBoardPowerOn)Function : There is a basic requirement that the
" +5V SB" power of the ATX power supply must be > = 0.1A (100mA).
Pleaserefertochapter 3-1 fordetail.

P55KTX
ISA PCI MainBoard
with Onboard PCI IDE and Super Multi-I/O.
ApolloVPX/97 PCIset
The specification is subject to change without notice.
TRADEMARK
Allproductsandcompanynamesaretrademarksorregistered
trademarksoftheirrespectiveholders.
V063

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

Contents
page
Chapter1 -Introduction......................................................1-1
P55KTXBoardLayout...................................................................1-2
Chapter 2 - Hardware Design .......................................... 2-1
2-1 MainboardLayout............................................................... 2-1
2-2 Connectors and Jumpers ................................................2-2
2-3 System Memory Configuration.......................................2-5
2-4 Integrated PCI Bridge.....................................................2-6
Chapter3-ATXPower Control........................................ 3-1
Chapter 4 -Award BIOS Setup ........................................ 4-1
4-1 Standard CMOS Setup ...................................................4-2
4-3 BIOS Features Setup ......................................................4-2
4-3 Chipset Features Setup ..................................................4-6
4-4 Power Management Setup..............................................4-8
4-5 PNP/PCI Configuration ..................................................4-10
4-6 Integrated Peripherals ....................................................4-12
4-7 Load Setup Defaults ......................................................4-14
4-8 Change Supervisor or User Password .............................4-15
4-9 IDE HDD Auto Detection ...............................................4-16
4-10 HDD LowLevel Format ..................................................4-18
4-11 Save & Exit Setup ..........................................................4-18
4-11ExitWithoutSaving .......................................................4-18
Chapter 5-OnboardTechnical 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
AppendixA:Post Codes ........................................................5-4
AppendixB:I/O Connector...................................................5-8
3-1 External Modem Ring-in Power ON and Keyboard
PowerON Funtion............................................................. 3-2

Introduction 1-1
Chapter 1
Introduction
R
The P55KTXmainboard is a high performance system hardware based
on Intel Pentium processor and is equipped with three PCI slots, four
standard ISA slots, Super Multi-I/O controller and dual port PCI-IDE
connectorsfor thefuture expansion. The hardware dimensionis 220mmx
270mmwithafour-layer-designtechnology.
Specification
VIAApolloVPX/97PCIsetchipset.
IntelPentium Processor, Pentium Processor with MMX Technology, AMD
K5/K6&Cyrix6x86/6x86L/6x86MXoperatingat90~333MHzwith321ZIF
socket 7 provides scalability to accept faster Processors in the future.
Supports up to 256 MegaBytes of SDRAM( 168-Pin DIMM x 3 ).
Supports512KB(PipelinedBurstSRAM))L2Cache.
Supports three 16 bit ISA slots and four 32 bit PCI slots and provides two
independent high performance PCI IDE interfaces capable of supporting
PIOMode3/4andUltra-DMA33devices.
Supports ATAPI (e.g.CD-ROM)devicesonboth IDE interfaces.
Supports a floppy port, a parallel port (EPP,ECP port), two serial ports
(16550Fast UART compatible), 1 USB Connector, a PS/2 style mouse
connecter and an AT style keyboard connector.
Supports Award Plug & Play BIOS.
Supports CPU Hardware sleep, APM (Advanced Power Management) and
ACPI (Advanced Configuration Power Interface).
Supports anATX power supply connector for a Remote On/Off , a Phone-
Ring Power On and aKeyboard Power On Function.
SupportsSwitching Regulator for CPU power supply.
Single Jumper for CPU working voltage selection.
R

1-2 P55KTX
Figure1-1
ATXPowerConn.
COM1
PS/2
MOUSE
K/B
CONN.
PRINTER
CONN.
COM2
USBConn.
CN1
W83877F
PCI#3
PCI#2
PCI#1
PCI#4
<
BIOS
P55KTXLayout
VT82C586B
DIMM 3 DIMM 2 DIMM 1
VT82C585VP
POWER-ON
SPEAKER
TB-LED
G-LED
RESETKEYLOCK
HD-LED
FDD CONN. Secondary IDE
SOCKET 7
64K*64 CACHE
VT82C587VP VT82C587VP
3
1
J7 J8 J9
GND
+12V
J6
31
J1
Primary IDE
GND
1 2
9 10
J10
2.0V
2.8V
2.9V
3.2V
3.5V
J11 2 1
6 5
+
+
+
1 5

Hardware Design 2-1
2-1 Mainboard Layout
TheP55KTXisdesignedwith VIA ApolloVPX/97PCIsetchipset which is
developed by VIA Corporation to fully support Pentium Processor PCI/ISA system.
TheVIAApolloVPX/97PCIsetchipset can increase integrationandimprove
performance designs. The chipset provides an integrated IDE controller with two
highperformanceIDE interfacesfor up tofour IDE devices(hard devices, CD-ROM
device, etc). The Winbond W83877F Super I/O controller provides the standard PC I/
Ofunction:floppy interface,two 16 ByteFIFO serial portsand EPP/ECP capable
parallel port. The P55KTX layout is shown in the previous page for user's reference.
Caremustbetakenwheninsertingmemorymodules,insertingCPUorevenplug-
ging PCI card into associated slots to avoid damaging any circuits or sockets on
board.Acooling fanisstrongly recommendedwheninstalling Pentium/pentium
MMX/K5/K6/6x86/6x86L/6x86MXprocessorduetopossibleoverheat.
TheP55KTXsupportsaminimumof8MBandamaximumof192MBofSystem
Memorywhile Onboard 512KB cache to increase systemperformance.
The P55KTXsupports standard Fast Page, EDO (Extended Data Out or Hyper
Page Mode) or synchronous DRAM.The P55KTX provides three 168-pin DIMM
sitesformemoryexpansion.Thesocketssupport1Mx64(8MB),2Mx64(16MB),4M
x64(32MB),and8Mx64(64MB)single-sidedordouble-sidedmemory modules.The
memorytimingrequires 70nsFast pagedevicesor 60nsEDO DRAM.(DRAM
Modulesmaybeparity[x36]ornon-parity[x32].
TheP55KTXsupportstwoOnboardPCIIDEconnectors,andautomaticallydetects
IDEharddisktypebyBIOSutilityautomatic.
The P55KTXsupports Award Plug & Play BIOS for the ISA and PCI cards. The
BIOS can be located in Flash EPROM which can replace BIOS code easily if neces-
sary.
Chapter 2
Hardware design
R

2-2 P55KTX
2-2ConnectorsandJumpers
This section describes all connectors and jumpers equipped in the mainboard. Please
refer to Figure 1-1 for location of each connector and jumper.
1.Power LED(+)
2.N/C
3.GND
4.Keylock
5.GND
1
5
4
1.Speaker
2.N/C
3.GND
4.GND
J12 1
Power Saving LED indicator - LED ON when system is
in any Saving mode.
Reset Switch - Closed to restart system.
Speaker - connect to the system's speaker for beeping.
KeyLock-Keyboardlockswitch&PowerLEDconnector.
Power-ON - Push the button to turn on the system.
- Pressing less than 4 seconds to enter the suspend mode
- Pressing more than 4 seconds to turn off the system
TurboLEDindicator-LEDONwhenhigherspeedisselected.
IDELEDindicator-LEDONwhenOnboardPCIIDE
Harddisks activate.
+
+
+
# There is no deturbo function so that the turbo LED is always ON.
J6 ThePowerSupply(+12V)oftheCPUCooling FAN
1.GND
2.+12V
3.GND
3
1

Hardware Design 2-3
1
J3 IrDA/ASKIRCONNECTOR
5
1.VCC
2.NC
3.IRRX
4.GND
5.IRTX
3
1
J1 KeyboardPower-ONFunctionSelection
1-2:Disabled
2-3:Enabled
Figure 3-2:P55KTXI/ObackpanelLayout
COM1 PS/2
Keyboard
PS/2
Mouse parallel port COM2

2-4 P55KTX
6x86(L)-PR150+
CPU TYPE J11 J7 J8 J9
6x86(L)-PR200+
6x86MX-PR166 1-2
3-4
NONE
NONE
IBM / Cyrix 6x86(L) & 6x86MX Installation
1-2
6x86(L)-PR166+
6x86MX-PR200
6x86MX-PR233 3-4
Intel Pentium Processor / Pentium MMX Processor
AMD K5 / K6 Installation
1-2 2-3 2-3
1-2 2-3 1-2
1-2 1-2 2-3
1-2 1-2 1-2
R
NONE
1-2
NONE
1-2
NONE
1-2
NONE
NONE
NONE
Clock/CPU Op. J11 J7 J8 J9
66/266MHz
J11
J7 J8 J9
2 1
66/100 MHz
60/120MHz
60/150MHz
66/166MHz
66/233MHz
66/200MHz
60/90 MHz
66/133MHz
66/300MHz
66/333MHz
R
1-2 1-2 1-2
2-3 1-2 2-3
2-3 2-3 2-3
2-3 2-3 1-3
NONE
NONE
4 3
6 5
3
2
1
6x86MX-PR233
6x86MX-PR266
6x86MX-PR266
1-2 1-2 2-3
NONE
NONE
1-2 2-3 2-3
1-2 2-3 1-2
1-2 1-2 1-2
ThesejumpersettingsarereservedforthefutureCPUversions.Whenthe
futureCPUversionsarereadyand suitableforthismainboard,thesejumper
settings will be correctly updated.
*
*
*
*
*
*
*
*
75MHz x 2.5
66MHz x 3
75MHz x 3
66MHz x 3.5
3-4
6x86MX-PR166
6x86MX-PR200 NONE
3-4
75MHz x 2
*
66MHz x 2
60MHz x 2
66MHz x 2
75MHz x 2
60MHz x 2.5
66MHz x 2.5
*

Hardware Design 2-5
2-3SystemMemoryConfiguration
The P55KTX supports different type of settings for the system memory. The
following figures and table provides all possible memory combinations.
>
>
DIMM2
32MB 32MB 32MB
16MB 16MB 16MB
MAX. = 256MB8MB 8MB 8MB
DIMM1 DIMM2 DIMM3 TOTAL
BANK 2
BANK 0
128MB 128MB
NOTE: TheKEYZOOM ofthe DIMMsocket is 3.3V / Unbuffered.
LEFT KEY ZONE CENTER KEY ZONE
DRAM chip
J10:CPUVcorevoltageselection:ForPentiumProcessorwithMMXtechnology,
AMD K6 and Cyrix 6x86L/6x86MX
1-2 : 2.0V (Reserved forAMD K6in the future)
3-4 : 2.8V for Pentium Processor with MMX technology
and Cyrix 6x86L
5-6 : 2.9V for AMD K6-PR2-166/200MHz and Cyrix
6x86MX
7-8 : 3.2V for AMD K6-PR2-233/266MHz
9-10 : 3.5V for Intel Pentium, Cyrix 6x86 and AMD K5
9 10
1 2
>
DIMM1
BANK 1
BANK 0 BANK1 BANK2 Memory
x 1x 1 x 1 =
DIMM3
64MB 64MB
NONE
x 1 x 1

2-6 P55KTX
2-4IntegratedPCIBridge
TheP55KTXutilizesVIAApolloVPX/97PCIsetchipsettosupportIntelPentium
Processor PCI/ISA system. The VIA Apollo VPX/97 PCIset chipset consists of the
82C585VPXsystemcontroller(TSC),two82C587VPDataPath(TDP)devices,and
one82C586BPCIISA/IDEAcceleratorbridgechip.Itprovidesaninterfacewhich
translates CPU cycle into PCI bus cycle, and PCI burst read/write capability. In
addition, it provides high performance PCI arbitor to support four PCI Masters,
RotatingPriorityMechanism,andHiddenArbitrationSchemeMinimizesArbitration
Overhead.
TherearefourinterruptsineachPCIslot:INTA#,INTB#,INTC#,andINTD#.Since
the P55KTXadapts 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 interrupt
used by ISA add-in cards in the BIOS Setup utility.
However, if a "Legacy card" (such as plugging a paddle card and cable into an ISA
slot)ispluggedinthesystem,modificationintheROMSETUPUTILITYbecomes
necessary.Firstofall,youmustenterPCICONFIGURATIONSETUPutilityfrom
theROMSETUPUTILITYmainmenutoset"ISA"forthe"PCIIDEIRQMAPTO
Secondly,youmustentertheCHIPSETFEATURESSETUPUTILITYfromtheROM
SETUPUTILITYmainmenuandset"Disable"forthe"OnboardPrimaryPCIIDE
andtheOnboardSecondaryPCIIDE.WhenyouplugPCI/ISAIDEcardsintothe
system,Youshouldselect"Disabled"fortheOnboardPrimaryandSecondaryPCI
IDEfromtheCHIPSETFEATURESSETUPUTILITYtoo.
You can set the system interrupt request (IRQ) on some "Legacy cards" which have
on paddle card and cable. (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 second slot
(markedPCI#2) because theSecondary INT signaltakes INTB fromthe slot (referto
Page3-12forcircuitdiagram).TheuserthenentersthePCICONFIGURATION
SETUPutilityfromtheROMSETUPUTILITYmainmenuandset"PCI-Slot1"for
the "PCIIDEIRQMAPTO(This depends on the slot # where the Legacy card is
plugged).
.
R

Introduction3-1
Chapter 3
ATX Power Control
P55KTXBOARD
ATX
POWER
SUPPLY
Figure3-3:SimpleATXPowerON/OFFController
System Power ON/OFF Button
>
Tthe P55KTX equips an ATX power connector which is a single 20-PIN input device
for an ATX power supply (see Figure 3-3). An ATX power supply provides a build-
inRemotePowerON/OFFfunction.Toimplementthefunction,amomentaryswitch
which is normally open should be connected to the position J12(PIN 24, 25) as the
system's power ON/OFF button. Note that an AT power supply does not offer this
function.
Based on the ATX power connector, the P55KTX has been designed to support
both ACPI and Soft-OFF functions. According to the definition of ACPI, a Suspend
mode will be enabled while you push the J12(system power ON/OFF) button less
than 4 seconds. Nevertheless, the system will be turned off by pressing for more
than4seconds. RegardingtheSoft-OFF(comingfrom the P55KTX onboardcircuit
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.
J12

3-2 P55KTX
3-1 ExternalModem Ring-inPower ONand KeyboardPower 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
externalmodemtoCOM1orCOM2,theP55KTXmainboardallowsuserstoturnon
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 the ATX
power supply. This function is available only under system being connected to
ATX power supply.
How to work with it
Step 1: Please place J1 at the position 2-3 after you finished the system installation.
Step 2 : Push the momentary switch to turn on your system and then push again to
hold for more than 4 seconds to turn it off as soon as you turn it on.
Step 3: You can enjoy the Keyboard Power ON function by pressing any 1 or 2
keys on you keyboard at the same time for 1-2 seconds. Your system will be
turned on automatically, after releasing the keys. To power off you system,
you can use the Soft-OFF function under Windows 95.
Notes:
1. The number of keys needed to turn on a system depends on the model of
keyboard you are appplying due to different loadings on different keyboards.
Here, we would like to suggest you push 2 keys at the same time..
2.Intel ATX version 2.0 specification has recommended you use the power
supplywith0.72A(720mA). WithourP55KTXmainboard,the5.0VSBstandby
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 placed J1 at the position 1-2 to disable this
feature.
3
1
J1 KeyboardPower-ON Function Selection
1-2 : Disabled
2-3 : Enabled

AWARD BIOS 4-1
CHAPTER 4
AWARD BIOS SETUP
Award'sROMBIOSprovidesabuilt-insetupprogramwhichallowsuser to modifythe
basicsystem configuration and hardware parameters.The modifieddata willbe stored
inabattery-backedCMOSRAMsodatawillberetainedevenwhenthepoweristurned
off.Ingeneral,theinformationsaved intheCMOSRAMstaysunchangedunlessthere
isaconfigurationchangeinthesystem,suchasaharddrivereplacementoranewdevice
installation.
If this does happen you will need to reconfigure your configuration parameter.
To Enter Setup Propgram
Poweronthecomputerandpress<Del>keyimmediately.ThiswillbringyouintoBIOS
CMOSSETUPUTILITY.
ROMPCI/ISABIOS(2A5LDPAB)
CMOSSETUPUTILITY
AWARDSOFTWARE,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
Time, Date, Hard Disk Type...
Figure4-1 CMOSSETUPUTILITY
The menu displays all major selection items. Select the item you need to reconfigure.
The selection is made by moving cursor (press any direction key ) to the item and
press the 'Enter' key. An on-line help message is displayed at the bottom of the
screen as the cursor is moving to various items which provides a better understand-
ing of each function. When a selection is made, the menu of selected item will appear
so the user can modify the associated configuration parameters.

4-2 CHAPTER 4
4-1 STANDARD CMOS SETUP
Choose"STANDARDCMOSSETUP"intheCMOSSETUPUTILITYMenu(Fig.4-1).
The STANDARD CMOS SETUP allows user to configure system setting such as the
currentdateandtime,typeofharddiskdriveinstalled, floppydrivetype,anddisplaytype.
Memorysizeisauto-detectedbytheBIOSanddisplayedforyourreference.Whenafield
is highlighted (use 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.
Figure4-2 STANDARDCMOSSETUP
Selectingthe"BIOSFEATURESSETUP"optionintheCMOSSETUPUTILITYmenu
allowsusertochangesystemrelatedparametersinthedisplayedmenu.Thismenushows
allofthemanufacturer'sdefaultvaluesoftheP55KTX.Again,usercanmovethecursor
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
fromBIOS[F6]orCMOS[F7]areaifshowndataiscorrupted.Thisprovides thesystem
a capability to recover from any possible error.
4-2BIOSFEATURESSETUP
NOTE: The "Halt On :" field is to determine when to halt the system by the BIOS if an error
occurrs.
NOTE: If the hard disk Primary Master/Slave and the Secondary Master/Slave are set
as "Auto", then the hard disk size and model will be auto-detected.
ROM PCI/ISA BIOS(2A5LDPAB)
STANDARD CMOS SETUP
AWARD SOFTWARE, INC.
ESC : Quit : Select Item PU/PD/+/- : Modify
F1 : Help (Shift) F2 : Change Color
Date (mm:dd:yy) : Wed, Apr 17 1997
Time (hh:mm:ss) : 14 : 30 : 50
HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDZONE SECTORS MODE
Primary Master :Auto 0 00 0 0 0 Auto
Primary Slave :Auto 0 00 0 0 0 Auto
Secondary Master : Auto 0 00 0 0 0 Auto
Secondary Slave : Auto 0 00 0 0 0 Auto
Drive A : 1.44M,3.5 in.
Drive B : None
Floppy 3 mode Support : Disable
Video : EGA/VGA
Halt On : All Errors
Base Memory : 640K
Extended Memory: 15360K
Other Memory : 384K
Total Memory : 16384K

AWARD BIOS 4-3
Note: The Security Option contians "setup" and "system". The "setup" indicates
that the password setting is for CMOS only while the "system" indicates the pass-
word setting is for both CMOS and system boot up.
CPUInternalCache /External Cache: Thesetwocategoriesspeedupmemory
access. However, it depends on CPU/chipset design. The default value is Enabled.
IfyourCPUis without InternalCachethenthisitem "CPU InternalCache"willnot
be shown.
Enabled:Enable cache.
Disable :Disable cache.
Virus Warning: This category flashes on the screen. During and after the system
boots up, any attempt 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 any attempt to access the boot sector or
harddiskpartitiontable.
Disabled:No warning message to appear when any attempt to access the boot sector
orharddiskpartitiontable.
ROM PCI/ISA BIOS(2A5LDPAB)
BIOS FEATURES SETUP
AWARD SOFTWARE, INC.
Esc : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift)F2 : Color
F7 : Load Setup Defaults
Figure4-3 BIOSFEATURESSETUP
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 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

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
somecheckingitemsduringPOST.
Enabled:EnablequickPOST.
Disabled:NormalPOST.
Boot Sequence:This category determines which drive is searched first for
theO/S(OperatingSystem).Thedefaultvalueis A,C.
A,C :The system will search for floppy disk drive first then hard disk drive.
C,A :The system will search for hard disk drive first then floppy disk drive.
Swap Floppy Drive: ThiswillswapyourphysicaldrivelettersA&Bifyouareusing
two floppy disks. The default value is Disabled.
Enabled : Floppy A & B will be swapped under the O/S.
Disabled :Floppy A & B will be not swapped.
BootUpFloppySeek: DuringPower-On-Self-Test (POST),BIOSwilldetermineifthe
floppydiskdriveinstalledis40or80tracks.Only360Ktypeis40trackswhile760K,
1.2Mand1.44Mareall80tracks.ThedefaultvalueisEnabled.
Enabled :BIOS searches for floppy disk drive to determine if it is 40 or 80 tracks.
Notethat BIOS cannot tell from720K, 1.2Mor 1.44Mdrive type asthey are
all80tracks.
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: The default value is On.
On : Keypad is number keys.
Off : Keypad is arrow keys.
Boot UP System Speed: Select default system speed. The system will run at the
selected speed after the system boots.
High: Set the speed to high.
Low : Set the speed to low.
Gate A20 Option: This refers to the way the system addresses memory above 1MB
(extendedmemory). The defaultvalue isFast.
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.

AWARD BIOS 4-5
Typematic Rate Setting: This determines the typematic rate.
Enabled:Enable typematic rateandtypematic delayprogramming.
Disabled: Disable typematic rate and typematic delay programming. The system
BIOS will use default value of 2 items and the default is controlled by the
keyboard.
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.
TypematicDelay(Msec):Thisdetecminesthetimebetweenthefirstandsecond
character displayed, when holding a key.
250:250msec.
500:500msec.
750:750msec.
1000:1000msec.
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 correct
password is not entered at the prompt.
PCI/VGAPaletteSnoop:ThisfiledcontrolstheabilityofaprimaryPCIVGA
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 the ISA card connects to VGA monitor and uses the RAMDAC of
PCIcard,thePCI/VGAPaletteSnoopisenabled.
Disabled:DisabletheVGAcardPalettesnoopfunction.
VideoBIOSShadow: ItdetermineswhethervideoBIOSwillbecopiedtoRAM,
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
4-3CHIPSETFEATURESSETUP
Choose the "CHIPSET FEATURES SETUP"in the CMOS SETUP UTILITY
menu to display the following menu.
ROM PCI/ISA BIOS(2A5LDPAB)
CHIPSET FEATURES SETUP
AWARD SOFTWARE, INC.
C8000 - CBFFF Shadow:
CC000- CFFFF Shadow:
D0000 - D3FFF Shadow:
D4000 - D7FFF Shadow:
D8000 - DBFFF Shadow:
DC000- DFFFF Shadow:
These categories determine whether optional ROM will be copied to RAM by 16K
byte or 32K byte perunit and the size depends on the chipset.
Enabled : Optional shadow is enabled.
Disabled: Optional shadow is disabled.
DRAM Auto Configuration : 70 ns
DRAM Timing Control : Auto
Video BIOS Cacheable : Enabled
System BIOS Cacheable : Disabled
Memory Hole At 15Mb Addr. : Disabled
Fast DRAM Decoding : Disabled
Sustained 3T Write : Enabled
2 Bank PBSRAM : 3-1-1-1
Read Pipeline : Enabled
Write Pipeline : Enabled
Cache Timing : Fast
Linear Burst : Disabled
SDRAM Cycle Length : 2
SDRAM Bank Interleave : Disabled Esc : Quit : Select Item
F1 : Help PU/PD/+/- : Modify
F5 : Old Values (Shift)F2 : Color
F7 : Load Setup Defaults
Note: When you insert slower memery modules in the system and set a faster
timing,maybe the systemwill hangup.
Figure4-4 CHIPSETFEATURESSETUP