486 SIS
SIS 486 PCI/ISA GREEN PC
SYSTEM BOARD
USER'S MANUAL
EDITION MAY 1995
COPYRIGHT
This manual and the information contained herein are protected by
Copyright. All rights reserved.
WARNING AND DISCLAIMER
This manual is designed to provide information about the
SIS 486 P I. System Board. Every effort has been made to make
this manual as accurate as possible, but no warranty or fitness is
implied. The information is provided on an ‘as is' basis The
author and his corresponding publishing company shall have
neither liability nor responsibility to any person or entity with
respect to any loss or damages arising from the information
contained in this manual or from the use of the System board that
accompanies it. Information contained in this manual is subject to
change without notice. The manufacturer of the System board will
not be held responsible for technical or editorial omissions made
herein, nor for the incidental or consequential damages resulting
from its furnishing, performance, functionality or use. Subsequent
changes to this manual will be incorporated into the next edition.
We welcome any suggestion regarding this manual or our
computer products.
TRADEMARKS
All trademarks are the property of their respective owners.
TABLE OF CONTENTS
CHAPTER 1. FEATURES 1
1.1 SPECIFICATIONS 1
CHAPTER 2. INSTALLATION 2
2 1 LAYOUT REFERENCE 2
2.2 SIS 486 P I. JUMPER SETTINGS 3
2 3 MEMORY CONFIGURATION 6
2.4 CACHE RAM CONFIGURATION 7
CHAPTER 3. BIOS SETUP 8
3.1 WINBIOS SETUP 9
CHAPTER 4. SOFTWARE DRIVER 23
4.1 SOFTWARE DRIVER 23
CHAPTER 1. FEATURES
1.1 Specifications.
E a r
i•gyp gr/i t 1: 4 x ISA and 3 x PCI slots
irm p CT. f
[BIOS ZD
G/QftiNcTiON~l
im ta n strR 1
Z2 ■ 25-120 MHz Intel/AMDi'Cyrix/SGS-THOMSON/IBM..
486SX/DXyDX2/DX4, 3 3V/3 45V/4V/5V CPUs.
] : 4 x 72-pin SIMM sockets.
: SIS 85C496 PCI/CPU Memoiy ControUer.
SIS 85C497 AT Bus ControUer
: 128K/256K/512K.
: AMI WIN BIOS.
: ON BOARD 2 x PCI IDE DEVICES , I x FDC, 2 x
SERIAL PORTS (16550 FAST COM), 1 x PARALLEL
PORT DEVICE /EPP/ECP.
: 22 CM x 22 CM.
SIS 486 P I PAGE I
CHAPTER 1. FEATURES
CHAPTER 2. INSTALLATION
CHAPTER 2. INSTALLATION
SIS 486 P I PAGE 2
CHAPTER 2. INSTALLATION
2.2 SIS 486 PI JUMPER SETTINGS
1, JP5 : CPU CLOCK. SELECTOR (VEI.I.OW JU MPER C A P)
(25 MHZ)
486SX/DX-25
486DX2-50
486DX4-75, P24T-63
1-2 OFF
JP5
3-4 OFT
2. JP28.W4 : 3V.4V/5V CPU VOLTAGE SELECTOR (RED JUMPER CAP)
IN I FI..AMD CvrixTI
JP28
W4
1. CPU TYPE SELECTOR (RED JU MPER CAP)
INTEL
AMD(NV8T)
DX/DX2'
DX/DX2
DX4()I)P
OFF
JP9
mio
OFF
OFF’ OFF
jp i i
2-3 2-3
JPI2
4-5
11*13
1-2
JPI4
2-3
JPI 5
JIMft OFF’
1-2 OFF
Jl»l»
OFF OFF’
JIM*)
3-4 3-1
JP20
OFT OFF Oil
JP21
3-4 OFF’ 1-2,3-1
JP23
JP24 1-2.3-4 I-2.3-4
(33 MHZ)
486SX/DX-33
486DX2-66/DX4-100
P24T-83, AMI) 5X86-133
1-2 ON
3-4 ON
CYRIX
5X86
OFF
1-2 2-3
2-3 2-3
2-3
1-2
OFF ON
34
1-2,3-4
Cvnx DX2-80
CYRIXm
DX2/DX4
1-2,3-4
(3V)
1-2
OR'
DX4
OFF
OFF 1-2
OFF 4-5 2-3
OFF 2-3
OFF
OFF OFF
OFF
OFF
OIF
OFF
(4V)
2-3
OFF
1-2
1-2
3-4
2-3
2-3
(40 MHZ)
486DX-40
486DX2-K0
486DX4-I20
1-2 ON
3-4 Oil-
ALL 5V CPI? &
P24T-63/X3
X
ON
P24D
P24T AMT)
4iV/D(SV8B)
ENHANCED
OFF 2-3
OFF
1-2 OFF 1-2
1-2 1-2
1-2 1-2
4-5 1-2 4-5
2-3 OFF 2-3
2-3 2-3 2-3
OFF
1-2 1-2 1-2
OFF OFT OFF
3-4 2-3
OFF
1-2,3-4 3-1
1-2,3-4 I-2.3-1
(50 MHZ)
486DX-50
1-2 OFF
3-1 ON
5X86
-133
1-2 OFF
OFF
1-2
1-2,3-4
1-2,3-4
1-2
1-2
3-4
SIS 486 P I
PAGE 3
CHAPTER 2. INSTALLATION
4. JP17 • SPECIAL JUMPER (R ED JUMPE R CAP)
1- 2 - AMD(NV8T)DX4-100Ci>U
- INTEL P24D WR1TF-BACK CPUs LIKE DX2-66,I)X4-75'100
- AMD (SV8B) ENHANCED WRITE-BACK CPUs
- AMD 5X86 WRITE-BACK CPUs
- CYRIX 5X86 WRITE-BACK CPUs
2- 3 : ONLY FOR 3.3V AMD DX2-66/80
OFF : (REMOVE ALL CAPS) FOR OTHER CPUs EXCEPT ABOVE.
5. JP25-27: CACHE SIZE SE t.FCTOR.snn PAGE 8.
6. JP1 : MONITOR TYPE SELECTOR (BLACK JUMPER CAP)
OFF. : COLOR (DEFAULT)
ON : MONOCHROME
7. JP2.JP3 : BATTERY SELECTOR (BLACK JUM PER CAP)
1- 2 : NORMAL (DEFAULT)
2- 3. KTC DISCHARGE
8. SI : IRQ SELECTOR (BLACK JUMPER CAP)
S2.S3 : DMA SELF.CTOR(BlACK JUMPER CAP)
1. SELECTION TABLE
SI S2
1-2 ON IRQ-5 DRQ-I DACK-1
2-3 ON IRQ-7 DRQ-3
2. NOTE.:
(1) USER USUAL) Y IS NO NEED TO CHANGE JUMPERS ONLY
WHEN ENCOUNTERS I/O CONFLICT I IKE USING EPP/ECP
DEVICES OR SOUND CARDS.
(2) ONCE CONFLICT IS ENCOUNTERED.PLEASE SET CORRECT
1RQ/DMA ON CARDS OR PERIPHERALS ACCORDING THE USER
MANUAL OF PERIPHERALS OR CARDS.
S3
DACK-3
SIS 486 P I PAGE 4
CHAPTER 2. INSTALLATION
9. OTHER JUMPER SETTINGS AND CONNECTORS :
CN 1: 0>E CONNECT OR # 2.
CN 2: IDE CO NNEC TO R# 1.
J3 : EXTERNAL BATTERY CONNECTOR
)i : COM2 CONNECTOR
J5 : COMI CONNECTOR
J6 : PARALLEL CONNECTOR.
J7 ; FRONT PANEL CONNECTOR.
J8 : SPEAKER CONNECTOR
J10 : RESET CONNECTOR
J11 : TURBO LED CONNECTOR
JP4 : FLOPPY DISK CONNECTOR
JP6 : IDE # 1 LED CONNECTOR
JP7 : IDE U 2 LED CONNECTOR
JP30 : TURBO SWITCH CONNECTOR
'•'N OTE : CN1 IS DEFAULTED AS IDE CONNECTOR # 2
CN2 IS IDE CONNECTOR # 1
REMARKS
1. BEFORE INSTALL A CPU ON MAIN BOARD,YOU NEED TO CHECK
DETAILEDLY WITH YOUR SUPPLIER WHATS CPU CLOCK,
VOLTAGE , MODEL-THEN REFER TO ABOVE JUMPER SETTINGS
FROM POINT I TO 4 CAREFULLY. PLEASE NOTE IMPROPER
JUMPER SETTING WILL CAUSE SYSTEM TO SHUTDOWN.
2. P24T-63«3 ARE INTEL PENTIUM ODP CPUs HAVE ON PACKAGE
3.3V/5V REGULATION, SO MAIN BOARD IS SET AS “5V".
3. AMD PLUS SERIES ARE AMD’S LATEST "WRJTE-BACK"
TECHNOLOGY CPUs.
4 THIS BOARD IS NOT DESIGNED FOR ANY T I486 CPU
SIS 486 P.l
PAGES
CHAPTER 2. INSTALLATION
23 Memory Configuration
This section provides information on how to install the DRAM and
Cache RAM. Improper installation of DRAM or Cache RAM will
cause the system to shutdown.
There are no jumpers for the DRAM configuration. The BIOS will
test the DRAM type and size automatically. There are four -banks
from SIMM1 to SCMM4 on main board, please follow SIMM1,
then 2,3,4 to install memory. DRAM speed must be 70ns or faster.
Both parity (x36) or non-parity (x32) are acceptable.
- TOTAL
lOMBytes 1MB
12MBytes 4MB —
16 MBytes 4MB
16MBytes 8MB
16MBytes 16MB
20MBytes 4MB
24MBytes 8MB
32MBytes 16MB
40 MBytes
64MBytes
64MBytes
128M Bytes
NOTE: SIMM1 and SIMM3 accept both single side and double
check carefully before installation.
SIMM 1 SIMM2
1 MBytes 1MB
2MBytes
4MBytes
SMBytes
8MBytes
8MBytes 8MB
1MB 1MB
1MB 1MB 1MB
1MB 4MB
4MB 4MB
8MB
16MB 16MB
64MB
64MB
S1MM3 SIMM4
— —
—
1MB
— —
—
—
—
1MB 8MB —
8MB
4MB 4MB 4MB
—
8MB
—
—
— —
16MB
—
16MB
—
16MB
—
16MB 16MB
16MB
16MB
— —
64MB
—
—
—
—
—
—
—
—
—
—
—
—
side DRAM. SIMM2, &IMM4 just for single side only,
SIS 486 p :
PAGE 6
CHAPTER 2 INSTALLATION
2.4 Cache RAM Configurations
The SIS 496 P.I..system is very flexible in its configuration of
Cache SRAM. Please refer to the Following tables.
(BLACK JUMPER CAP)
IMP
128K
JP25 1-2 2-3
JP27 2-3 2-3
256K
512K
2-3
1-2
JP26 : TAG RAM SIZE SELECTOR
1- 2 : 32K X 8/8K X 8
2- 3 : 16K X8
(I) 128KB Cache RAM
Bank 0 ( U22,U23,U24,U25 ) : 32Kx8 SRAM4pcs.
Tag RAM (U 2 1) : 8Kx8/32Kx8 SRAM 1 pc
(2) 256KB Cache RAM
Bank 0 ( U22,U23,U24,U25 ) : 64Kx8 SRAM 4pcs.
Tag RAM (U21 ) ; 32Kx8/16Kx8 SRAM Ipc
(3) 512KB Cache RAM
Bank 0 ( U22.U23,U24,U25 ) : 128Kx8 SRAM4pcs
Tag RAM (U 2 1) : 32Kx8 SRAM 1 pc
SIS 486 P.l
PAGE 7
CHAPTER 3 BIOS SETUP
CHAPTER 3 BIOS SETUP
Win BIOS Power-On Self Test
WinBIOSprovidts all IBM standard Power-On Self Test (POST) routines as
well as enhanced WinBlOS POST routines. WinBIOS POST supports CPU
internal diagnostics. WitdtiOS POST checkpoint codes are accessible via the
Manufacturing l est Port (I/O Port 80h).
WinBIOS Beep Codes
Error message
b~ 8!
Refresh Failure The memory refresh circuitry ii laulty.
■
Parity Error
Dose 64 K.B Memory Failure Memory failure in first 64 KB.
3
Timer Not Operational A memory failure in the first 64 KB of
4
5 Processor error The CPU generated error.
8042 > tiale A20 Failure Cannot switch to protected mode.
Processor K\urptiofi Interrupt
Display Memory Rcad/Wnte
F.mj*
ROM Checksum Error The ROM checksum value does not
10 CMOS Shutdown Reg iaer
Kead/Wntc Krror
II Cache mentor, bad - do not
enable cache
DeucriptioB
Parity error io the base memory (the
first 64 KB block) of memory.
memory, or Timer l is not fuocttotunp
The CPU on the CPU Card generated
an exception interrupt
The system video adapter is either
mining or its memory is faulty. This is
uot a fatal error.
match the vr loe encoded i« WiaBIOS.
The shutdown register for.CMOS RAM
has failed
The cache memory test fa ta l Cache
memory is disabled. Do not prejs
<A!t > - Sh ift.' ■■ t> to amble
SIS 486 PI
PAGE 8
CHAPTER 3 BIOS SETUP
What to Do If the Computer Beeps
Here is whal you need to do ify our computer has a WinBIOS and it starts
beeping:
1 Iflbe sys tem beeps... then...
9“
4 >,7 . or 10 tunes.
3-1 WinBIOS Setup
WinBIOS Setup configures system information that is stored in CMOS RAM
WinBIOS Setup has an easy-to-use graphical user interface that yvill be
immediately recognizable (o anyone who has ever used Microsoft Windows.
WuiBJOS Setup sets a new standard in BIOS user interfaces.
Starting WinBIOS Setup
As POST executes, th e following appears:
Press <Dcb- to run WinBIOS Setup.
resesj tkc memory SIMMs or DIPs. If the system
still beeps, replace the memory.
reseat (be keyboard controller chip- If it still beeptk
replace the keyboard controller. If it still beeps, try a
different keyboard, or replace Ike keyboard fuse, if
I b e keyhoard has one.
there is a memory error on the video adapter.
Replace (he video adapter, or the RAM on the video
adapter.
the BIOS ROM chip is bad. The system probably
needs a new BIOS ROM chip,
reseat the cache memory no the motherboard. If it
still beeps, replace die cache memory.
the motherboard must be replaced.
SIS 486 p.l
PAGE 9
CHAPTER 3 BIOS SETUP
tiling a Mouse with WinBIOS Setup
WmBIOS Setup can be accessed via a keyboard, a mouse or a pen .
The mouse click functions arc :
* single click to change or select both global and current fields and
* double click to perform an operation in the selected field.
Using the Keyboard with WinBIOS Setup
WinBIOS Setup has a built-in keyboard driver that uses simple keystroke
combinations:
K q i lnte
<T»b> Move to the aext wiraiow cr field.
Move to the next field to the right, left, above, or below.
<Enter> Sele ct ill the current field.
+ lncrementi • value.
Decrements a value.
<E ao Closes the current operation and return to previous level
Return to the previous page.
<PgUp>
<PgDn> A dvances to the next page.
<Home> Retr ain to the beginain* of the tex t
<End> Advances to the eud of the text
<AU><H> Acces s s help wisdow.
<AS>
Exit WinBIOS Setup
<Specebar>
A to Z are used in the Virtaal Keyboard, and are not case-seasrtne.
Alphabetic
ktys
0 to 9 are used in the Virtual Keyboard aud Numeric Keypad
Fiik Iw i
SIS 486 P.l PAGE 10
CHAPTER 3- BIOS SETUP
WinBIOS Setup Maiu Menu
The WinBIOS Setup main menu, shown bdow, is organized into four
windows. Each window corresponds to a section in this chapter.
3-2 Standard Setup
This option is used to set system time,date, floppy drives and hard
disk type.
Using Auto Detect Hard Disk (Only for IDE Drives)
If you select Detect C: or Detent D: from the Utility section o f the WinBIOS
Setup main menu, WinBIOS automatically finds all IDE hard disk drive
parameters. WinBIOS places the hard disk drive parameters that it finds in the
Drive C: Type or Drive D: Type fields in Standard Setup.
3-3 Advanced Setup
The Advanced System Setup menu illustrated above has three
submenus, allow you to configure the following chipset
performance and compatibility options.
Typematic Rate (Chars/Sec)
Typematic Rate sets the rate at which characters on the screen
repeat when a key is pressed and held down. The settings are /5,
20, 24, or 30 characters per second.
SIS 486 P I
PAGE 11
CHAPTER 3 BIOS SETUP
System Keyboard
This option does not specify if a keyboard is attached to the
computer. Rather, it specifies if error messages are displayed if a
keyboard is not attached This option permits you to configure
workstations with no keyboards. The settings are Absent or
Present.
Primary Display
Select this icon to configure the type of monitor attached to the
computer. The settings are Monochrome, Color 40x25, Color
80x25, VGA/PGA/EGA. or Not Installed
Mouse Support
When this option is enabled, WinBIOS supports a PS/2-type
mouse. The settings are Enabled or Disabled.
Above 1 MB Memory Test
When this option is enabled, the WinBIOS memory test is
performed on all system memory. When this option is disabled,
the memory test is done only on the first 1 MB of system memory
The settings are Enabled or Disabled.
Memory Test Tick Sound
This option enables (turns on) or disables (turns off) the ticking
sound dunng the memory test. The settings are Enabled or
Disabled
Hit <DEL> Message Display
Disabling this option prevents
Hit <DEL> if you want to run Setup
from appearing when the system boots. The settings are Enabled
or Disabled.
SIS 486 P.l PAGE 12
CHAPTER 3 BIOS SETUP
Extended BIOS RAM Area
Specify in this option if the top 1 KB of the system programming
area beginning at 639K or 0:300 in the system BIOS area in low
memory will be used to store hard disk information. The settings
are Top IK OR 0:300.
Wait for <Fl> If Any Error
WmBIOS POST runs system diagnostic tests that can generate a
message followed by:
Press <F1> to continue
If this option is enabled, WinRIOS waits for the end user to press
<FI> before continuing. If this option is disabled, WmBIOS
continues the boot process without waiting for <F1> to be pressed.
There settings are Enabled or Disabled.
System Boot lip Num Lock
Wheo On, this option turns off Num Lock when the system is
powered on so the end user can use the arrow keys on both the
numeric keypad and the keyboard. The settings are On or Off.
Floppy Drive Seek At Boot
When this option is enabled, WinBIOS performs a Seek command
on floppy drive A: before booting the system. The settings are
Enabled or Disabled.
System Boot Up Sequence
This option sets the sequence of boot drives (either floppy drive A:
or hard disk drive C:) that WinBIOS attempts to boot from after
POST completes. The settings are C.\ A: or A:, C:.
SIS 486 PI PAGE 13
CHAPTER 3 BIOS SETUP
System Boot UP CPU Speed
This option sets the speed of the CPU at system boot time. The
settings are High or Low.
External Cache
This option selects the type of caching algorithm used by
WinBIOS and the computer for L2 (external) secondary cache
memory. The settings are Wr-Thrv or Wr-DacL
Password Checking
This option enables the password check option every time the
system boots or the end user runs Setup. If Always is chosen, a
user password prompt appears every time the computer is turned
on. If Setup is chosen, the password prompt appears if
WinBIOS is executed.See page for instructions on changing a
password. The Optimal and fail-safe default settings are Setup.
Video ROM Shadow COM, 32K
When this option is set to Enabled, the video ROM area from
COOOOh - C7FFFh is copied (shadowed) to RAM for faster
execution. The settings are Absent, No Shadow, or Shadow,.
Sh adow C800, 16k Shad ow CCOO, 1 6k Shadow D000, 16k Shadow
MOO, 16k Shadow D800,16k Shadow DCOO, 16k
These options enable shadowing of the contents of the ROM area
named in the option title. The settings are Absent, No Shadow, or
Shadow. The ROM area that is not used by ISA adapter cards will
be allocated to PCI adapter cards.
3-4. Chipset Setup:
The chipset setup allows user to configure chipset performance
and compatibility options. Please do not to change default settings
since improper setting causes system to shutdown.
SIS 486 P I PAGE 14
CHAPTER 3- BIOS SETUP
Auto Configuration Function:
The settings are enabled and disabled, when set to enabled,
WinBios automatically detects ail default settings. Set to disabled
allows user to set the following options.
DRAM Speed:
This option allows user to select DRAM ACCESS TIME. Don't
select jasiest if DRAM is not good quality.
RAS To CAS Delay:
These settings allow user to set DELAY CYCLES between RAS
To CAS. Please refer to DRAM databook.
Write Cycle Post:
The 486 SIS P I. implements a 32-BIT ONE-LEVEL POST
memory buffer. Hie setting as O-WAIT enables it and /-WAIT
disables it. Please refer to Chipset databook.
Write Cycle CAS Pulse:
This option allows user to set how many CPU cycles which write
CAS needs. Please refer to DRAM databook.
CAS Precharge Time:
This option allows user to set how many CPU cycles which CAS
PRECHARGE needs. Please refer to DRAM databook.
Cache Write Cycle:
This option allows user to set how many CPU cycles which L2
cache memory to complete "WRITE".
SIS 486 P.l
PAGE 15
CHAPTER 3 BIOS SETUP
Burst Read Cycle:
BRUST READ cycle needs 4 BYTEs to complete. The setting IT
means the second to fourth BYTEs each needs 1 cycle like
X-1*1*1.2T means X-2-2-2. Please refer to DRAM databook.
Single Bm H Cycle:
SINGLE READ needs one BYTE to complete. This option allows
user to complete one SINGLE READ by 3 CPU cycles (3T) or
2 CPU cycles (2T).
VESA LBD Sampling Poing: N/A
AT BUS Clock:
Please always set 7.159 MHZ.
CPU-to-Memory Post W rite Buffer:
This option allows user to enable/disable CPU-TO-MEMORY
posting buffer. Please refer to chipset databook.
CPU-to-Memory Burst Write:
This option allows user to enable/disable CPU-TO-MEMORY
Burst Write register Please refer to Chipset databook
Memory Hole at 15MB:
This option allows user to set memory limit to 15MB when
enabled is set. Please always set disabled
Slow Refresh:
This option allows user to enable/disable slow REFRESH for
memory.
SIS 486 PI PAGE 16
CHAPTER 3 BIOS SETUP
On Chip IDE:
This option allows user to enable/disabie ON-BOARD IDE ports.
IDE Port Channel Selection:
This option allows user to select IDE address either lFx717x or
17x/IFx.
Primary (Secondary) Master (Slave) PIO Mode:
These options allow user to set proper PIO Mode of HDDs.
Improper setting will cause system to shutdown!
IDE Post Write Buffer:
This option allows user to enable/disabie IDE-POST-WRITE
Buffer on Chipset. (Enabled is faster but not recommeded since
some HDDs are not suitable for this option).
IDE Prefetch Read Buffer:
Similar to above buffer. Disabled is recommended.
PCI IDE Non Compliant Card:
This option allows user to use IDE card (cards) instead of IDE
tKjrts on board. Set proper slot (slots) number in BIOS according
to PCI slot (slots) card (cards) installed.
Primary (Secondary) PCI IDE Card Uses:
These options allow user to set INTA INTB
on cards.
PCI Latency Time Adjust:
This option allows user to set different values for PCI LATENCY
TIMER. Please refer to PCI Hardware and Software databook.
SIS 486 P I PAGE 17
.....
for PCI IDE add
CHAPTER 3 BIOS SETUP
PCI IRQ Allocation:
These options allow user to configure INT, IRQ, IRQ TRIGGER
for PCI slot 1.2.3
configure by itself.
3-5. POWER MANAGEMENT SETUP
The SIS 486 P I. supports GREEN or ENERGY SAVING
features by using the following options:
Bios Power Management Mode:
This setting allows user to set as disabled to ignore POWER
SAVING features or set as "IRQ 1 0” to "IRQ 15" to allow more
options as follows.
APM Interface
This option allows user to enable/disable APM (Advanced Po wer
Managem ent) interface which B IO S provides. When using
Operation System like UNIX, WINDOWS
(Only DOS can accept disabled )
Doze T im er:
User can set disab led or time values to enter DOZE MODE, After
time out CPU will slow down to 8MHz.
Stan dby Timer:
Similar to DOZE Timer, After STANDBY Timer CPU remains in
8MH2 but monitor will be blank if CPU is GREEN type like
INTEL SL-Enhanced.
Suspend Timer:
When timer out, CPU clock stops and monitor remains in blank
condition.
......
when set to manual. Set to Auto lets system
SIS 486 P I PAGE 18
..........
please enable it.
CHAPTER 3 BIOS SETUP
Event:
The WINBIOS supports several EVENTS like key board, video
(display), HDD/FDD
refer to BIOS.
Display Adapter Type:
Set YES if VGA card provides POWER SAVING function.
SMOCT Value
Please do not change the factory default values.
3-6 Peripheral Setup
If You Use On Board FDD & I/O Function , The BIOS
Peripheral Setup Must Be Enabled {DV.YAMVJ)
On-Board Floppy Drive
This option enables the use of the floppy drive controller on the
mother board (if installed), the settings are Enabled ox Disabled.
First Serial Port Address
IRQ4 is used for the first serial port (COM1). This option enables
serial port 1 on the mother board (if installed). The settings are
2E8k
Second Serial Port Address
IRQ3 is used for the second serial port (COM2). This option
enables serial port 2 on the mother board, if installed. The settings
are 2E8h
Parallel Port Address
CRQ7 is used for the parallel port (LPT1). The IRQ can be changed
to IRQ5. This option enables the parallel port on the mother board,
if installed. The setting are 2~8k
SIS 486 P I PAGE 19
.......
activities to wake up system Please
CHAPTER 3. BIOS SETUP
IRQ Active State
This option specifies if the parallel and serial port IRQs are active
high or active low. The settings are low or high.
Parallel Port Mode
This option specifies the parallel port Mode, The settings are
Normal or Extended.
3-7 Utility
the following icons appear in this section:
IDE SETUP : if HDD is an IDE drive, the hard disk drive
Color Set sets the WinBlOS Setup screen colors.
parameters for IDE drive are automatically delected
and reported to the Hard Disk Drive C: /D: screen in
Standard Setup, so you can easily configure drive
C: /D:.
SIS 486 PI
PAGE 20
CHAPTER 3 BIOS SETUP
34 Security
WinBIOS Password Support
WinBIOS Setup has an optional password feature. The system can be
configured so that all users must oile r a password every lime the system boots
or when WinBIOS Setup is executed.
You can enter a password by:
* typing the password on the keyboard,
* selecting each Idler via the mouse, or
* selecting each letter via the pen stylus.
Pen access must be customized for each specific hardware platform.
Setting a Password
The password check option is enabled in Advanced Setup by choosing either
A hvays (the password prompt appears every time the system is powered on) or
Setup (the password prompt appears only when WinBIOS Setup is run). The
password is stored in CMOS RAM. The system asks for a password.
Enter a 1 - 6 characia password. The password does not appear on the screen
when typed WinBIOS will ask you to retype the password Make sure you
write it down. I f you forget it, you must drain CMOS RAM and reconfigure the
system.
Changing a Password
Select the Password icon from the Security section of the WinBIOS Setup
main menu. Enter the password and press <Enter>. The screen does not display'
the cha racim enta uL A flu the new password is entered retype the new
password as prompted and press < Enter>.
If the password confirmation is incorrect, an error message appears. If the new
password is entered without error, press <E so to return to the WinBIOS Setup
Main Menu. The password is stored in CMOS RAM after WinBIOS Setup
completes. The next time the system boots, you are prompted for the password
if the password function is pres ait and is enabled.
SIS 486 P I
PAGE 21
CHAPTER 3 BIOS SETUP
Remember tbe Pvsword
Keep a record o f (he new password when (he password is changed. If you
forget the password and your computer has an American Megatrends
motherboard, remove the computer cover, set battery selector switch to RTC
discharge to ON. power on thecomputer. WinBIOS e ases tbe password
3-9 Qetautt
The icons in this section permit you to select a group of settings for all
WinBIOS Setup options. Not only yon can use these icons to quickly set
system configuration parameters, you can choose a group of settings have
a better chance of working when the system is having con figuration-related
problems.
Original
Choose the Original icon to return to the system configuration values presari
in WinBIOS Setup when you first began this WinBIOS Setup session.
Optimal
You cm load the optimal default settings for the WinBIOS Setup options by
selecting the Optimal icon. The Optimal default settings are best-case values
that should optimize system performance If CMOS RAM is corrupted, the
Optimal settings are loaded automatically.
Fail-Safe
You cm load the Fail-Safe WinBIOS Setup option settings by selecting the
Fail-Safe icon from the Default section of the WinBIOS Setup main menu.
The Fail-Safe settings provide far from optimal system performance, but are
the most stable settings. Use this optioo as a diagnostic aid if the system is
behaving erratically.
SIS 486 P.I PAGE 22
4-1 SOFTWARE DRIVER
THE SIS 486 P I. PROVIDES DRIVERS FOR IDE HDDs. PLEASE REFER
TO README.* IN DISKETTE.
1. RFADME.NOW: FOR DOS , WINDOWS. NETWARE.
2. README.SCO : FOR UNIX 3 2.X .
3. README.DOC : FOR OS/2.
SIS 496+497-C
SIS 486 P I
PAGE 23
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