“
SOYO
’M
About this Guide
*
This User's Guide is meant to assist both computer system
manufacturers and end users in setting up and installing
the mainborad.
Information
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contained in this document is subject to change without
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reserved.
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Edition
NOV 1993
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Electrostatic Discharge Precautions
Make sure you ground yourself before handling the
system components.
Note that you must
board in dry or air-conditioned environments.
Abide by the following precautions to protect your
electricity.
●
Do not remove the antistatic packaging
tbe
● Ground yourself before
protective
the
chassis.
●
Frequently ground
. . Handle the
components.
Static
take
mainboard
and
antistatic packaging
expansion
slot covers or
yourself
mainboard
electricity can
s[ecoa; precautions when handling the
other system
components. ‘
removing cnv system
other unpainted portions
wbde working or
by the edges
easily damage
until
You
can
and
you are
ground yourself
use
mainboard
the components.
equipment from
component
a grounding
avoid touching the
ready
of
or
to
the system
other
main-
b
static
install
from
its
by grasping ,
strap.
reface
Table of Contents
1. Introduction.................................................................1
1.1
Key Features
12 Mainboard Description
13 Unpacking and Handling Precautions
2.
Hardware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5
21 Jumpers
22 CPU Type Configuration .
2.3 Cache Memory Configuration. . . . . . . ...14
24 VESA Local Bus Configuration 16
2.5 Memory configuration... . . . . . . . . . . . . . . . ...17
26 Case and Power Connectors
3. AMI BIOS Setup .
31
3.2
3.3
3.4
35
3.6
37
38
3.9
310
Preface
’
. .
. . . . . . . . .
’
1
2
4
5
8
19
21
List
of
Tabtes
Display T ype Jumper
.
CMOS Reset Jump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3.
Reserved Jumpers
4.
5.
6.
7.
8.
9.
10.
11.
12,
1.
2.
3.
4.
5
6
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
—
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Configuration
CPU Type
Clock Frequency
oscillator
CacheConfiguration Summary
Cache
Size Jumper Settings
VESA Local
VESA Wait-State
On-board
Recommended Advancd
Mainboard Layout and Key Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
VESA 486
486SX-25/33PQFPCPU
486SX-25/33
486DX2-50/66
486DX2-50/66
POA CPU
64kb Cache Configuration......................15
128kb
Cache Configuration
256kb Cache
Installation
SIMM
Power Supply Connections
Setup
BIOS
BIOS
Setup,
BIOS
Setuup
Standard CMOS Setup M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Advanced CMOS Setup Menu and Default Settings....26
BIOS
Password Setup Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BIOS Hard Disk Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Generation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....14
Bus Clock
Configuration
Configuration
Memory Configuration
Mainboard
POA CPU Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
and 486DX-33/40/50 CPU Jumper Settings . . . . . . 11
and
Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Main M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Warning
Hdp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
CMOS Settin...............29
List
of Illustrations
Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...6
JumperSettings...
486DX-33/50 CPU Jumper
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...23
Settings
/
...17
10
. . . . . . . . . . ...11
..30
Chaptar 1:
Introduction
The VESA 4S6 mainboard is a highly integrated system board designed
to accommodate any member of the 486 family of CPUs, and features a
lngb-perform.ante secondary cache memory arckitecture of up to 256kb
in
size The mainboard also features an Industry Standard bus architecture combined With two VESA
a high-speed 32-bit interface to adapter cards that conform to VL-bus
specifications. The
ary
cache memory size, and an advanced VL-bus architecture make this
mainboard ideal for building powerful systems that must met the
demanding requirements of today
operating
advanced
1.1
Key
Features
The advanced features of the VESA 4S6
● support for an
● six 16-bit and one S-bit ISA expansion slots
● two 32-bit VESA local
● support for 64kb, 128kb or 256kb of secondary cache memory
● flexible memory support from lMB up to 32MB using 256kb, lMB,
● shadow RAM support for the system and video BIOS
● fast GateA20
● 4 layer design, two-thirds baby-AT board
● support ALL Cyrix CPUs. Cx 486S/S2, Cx 486DX/DX2 CP
● support ALL AMD 486 CPUs
486SX,
CPU running at a
SIMMs
or 4MB
and
running at a clock speed of 33/40/50 MHz.
local
bus expansion slots which provide
combination
of flexible CPU support, a large second-
’s
systems
graphical user interfaces and
mainboard
4S7SX, 4s6DX,
clock
speed of 25, 33, 40, or 50MHz
bus
486DX,
master expansion slots
reset support
include
P24T or Overdrive
size
U
II
1
1.2 Mainboard Description
The key components of the VESA 486 mainboard are illustrated and
described below. Please take a moment to become familiar with the
design.
Figure 1 Mainboard
1. System Microprocessor
Tbe VESA 486 mainboard can accept any member of the 486 family of
high performance 32-bit microprocessors, m either PQFP or PGA packaging. The mainboard is designed to run at a clock speed of 25, 33, 40, or
50MHz, and features a socketed oscillator or optional clock. generator to
facilitate easy field upgrades. The 486 series of microprocessors are backwardly compatible with operating systems and application software designed to
run on 8088, 286 and 386 microprocessor-based platforms.
Single Chip
2.
The VESA 486 mainboard is
which combines core logic for memory and secondary cache controlled,
direct memory access control, buffers, timing, and AT-bus related logic
into a single chip
ASIC
Layout
designed
and Key Components
around a
highly
integrated ASIC,
2
Introduction
3. Memory Architecture
The VESA 4S6 mainboard features 8 SIMM
module) sockets, organized into two banks, which allow flexible memory configuration and expansion. Possible memory
4MB, 8MB and up to a maximum of 32MB, without resort to a separate
expansion
memory
4. System 810S
The VESA 4S6 mainboard ships
cifically designed to maximize the performance potential of the mainboard The BIOS permits easy and flexible, yet powerful configuration
and performance optimization of the mainboard and system
5. Keyboerd Controller
The VESA 486 mainboard includes an 8042 single chip keyboard interface
cotroller, which works m conjunction with the system BIOS
6. ISA Expansion Slots
The VESA 486 mainboard features six 16-bit and one 8-bit ISA expansion slots, which can accommodate countless third-party expansion
boards and allows enormous flexibility in designing custom platforms
7. VESA 32-Bit Local Bus Expansion Slots
The VESA
Association (VESA) local bus master slot extensions, which can accommodate the growing number of high speed local but graphics boards and
other peripheral controllers The VESA
formance by providing peripherals access to the CPU
ning
at full clock speeds of up to 50MHz
8. Secondary Cache Architecture
The VESA 4S6 mainboard features a secondary cache memory architecture, which compliments the 8-kb set-associative cache designed into the
486 family of
12Skb or 256kb cache
board
with
486
mainboard also features two Video Electronics Standards
CPUs.
SRAM sockets are provided for support of a 64kb,
memory
size
(single
in-line memory
sizes
include 1MB,
a licensed AMI ROM BIOS, spe-
local
bus architecture boosts per-
’s
32-bit bus run-
Introdution
3
1.3 Unpacking and Handling Precations
The VESA 486 mainboard comes packed in a sturdy cardboard shipping
carton, which includes the mainboard and this User
Caution!
v
:~p,j~ mainboard
stored in
the anti-static
tug
’s
Manual.
until you are
ready to
The VESA 486 mainboard is easily damaged by static electricity.
Observe the following precautions while unpacking
mainboard:
● Before handling the mainboard or other systems components,
discharge static electricity from your body by touching an unpainted
area of the system
ground yourself frequently to discharge
accumulate in your body.
● After removing the
grounded surface with the components
● Check the mainboard for damage. If any socketed component appears
losse,
Otherwise, avoid touching the components on the mainboard
the mainboard and other system components by the edges.
’s
metal chassis. While installing the mainboard,
mainboard
from the anti-static bag, place it on a
press firmly brrt carefully to seat the chip irr its socket.
and
handling the
any
static electricity that may
facing up
Handle
Chapt8r2:
Hardware Configuration
Befomyouwtifie&SAWmtihwdtitotie~s-ctitis,you
may tind it convenient to first configure the mainboard jumpers and
install memory If an 4Sd microprocessor was not included with, snd
installed on the mainboard, you will also want to insert a supported
microprocessor at this time. After confirming the mainboard, you can
instll the mainboard in the system chassis, attach system peripherals,
and connect any case controls to the mainboard's connectors.
Iaqnm%ud
w
Turn off
all power
devices before
Hardware options on the VESA 486 mainboard are configured by setting
jumpers: rows of small pins on the mainboard which are set by using a
jumper cap. When a jumper cap is installed, the pins it covers are said to
"
closed" or "shorted"; if a jumper cap
be
are said to be
“on”
either
board itself, with pin
tory preset and should not be changed from their default settings VESA
4S6 mainboard connectors snd jumpers are
following page.
2.1
Jumpers
Jumpers on the VESA 4S6 mainboard are listed and described below.
CPU type, cache memory configuration,
are described
to the mainboard,
performing any
“o
pen”. In the case of 2-pin jumpers, a jumper cap may be
or “off. Most VESA 4S6 jumpers are clearly labelled on the
if
marked as such Note thst some jumpers are fac-
separately
in
sections
system chassis, and periheral
work on the mainboard
is not
installed, the
illustrated
and
VESA bus jumper
2.2, 2.3 and 2.4 below.
or
in Figure 2 on the
system.
jumper
pins
settings
Figure 2 VES4 486 Mamboanl
J2,.J72.J,S
Display Type Jumper JP3
3
P3
J
is 2-pm jumper which configures the mainboard for use with either
a color or monochrome graphics adapter Refer to Figure 2 for the
Layout
loca-
tion of JP3 The table below lists the correct
chrome and color display types, respectively.
jumper
settings for mono-
Color/EGA/VGA
CMOS Reset Jumper: JP5
is
a 3-pm jumper which allows you to discharge CMOS memory in
JP5
the event that you forget your password or encounter a BIOS Setup prob-
lem. Before you install the mainboard check to ensure that JP5 is
retain CMOS memory Refer to Figure 2 for the location of JF5 The
table below lists the correct jumper settings
CMOS memory.
Reserved Jumpers
Jumpers listed in the table below are factory preset and should not be
changed from
their
default settings
Table 2. CMOS Reset
Discharge
CMOS
Table 3 Reserved
~
. .
for
retaining and discharging
Jumper
~
I
Jumpers
set
to
2.2 CPU Type Configuration
The VESA 486
microprceessors
If you are installing or upgrading the CPU on the VESA 486 mainbusrd, ‘
you must set the CPU type jumpers correctly, and either configure the clock
generator or install an appropriately rated oscillator to match the speed rating
of the microprocessor.
v
CPU Type Jumpers
Jumpers
use with
to Figure 2 for
rizes
w%%)
CX4S6S +
CPU Clock Frequency Configuration
The VESA 486
tional
jumpers
mine the clock frequency. Refer to Figure 2 for
8
mainboard
can accept any member of the 486 series of
or
P24T,
running at cluck speeds of 25,33,40, or
Wwm”ng!
Do not use
an
mcilkrtm
or
speed of the micropressor. Doing so can
to
the
micropressor
JP8~JP9
different
member% of the 486
the
the proper
jumpers
CPU
Type
486SX
(PQFP)
4S7SX
Overdrive
4&DmWDDXX
CZ487S
CX4S6S2
CX4S6DX2
mainboard
clock generator. On
JP16, JP17
generate
and void your warranty
endJP12-JP13
location of
these
settings for different
Table
4 CPU Type
JP9 JP12
JP8
@
g
@
q
q
~
q
@
q
~
q q
features either a
mainboards
and JP18 are 2-pin jumpers which together deter-
a
clock
frequency above
result
in permanent
together configure
jumpers. The
the
series
Configuration
mainboard
of microprocessors. Refer
table
below
microprocessors.
JP13
~ ~
~
W
~
~
~
~
~
~
W
~
socketed
oscillator or
featuring a clock generator,
the location
of JP16-18.
Hardwara Currfiguratmn
50MHz.
the rated
damage
summa-
JP24
‘@
y
g
~
@
y
for
op-
The table below lists the proper jumpers settings to generate a 25, 33, 40
and 50MHz
clock frequency.
Table 5
Clock
Frequency Generation
Clock
Frequency
On
mainboards
priately
rated oscillator m socket Y2 Refer to
of socket Y2. The table below
es of
seri
-
7;
The illustrations below depict the correct CPU type and clock generation
&
settings for
25MHz 33MHz 40MHZ 50MHz
JP16
JP17
JP18
q g g
@
qq
w w
featuring a socketed
microprocessors
Oscilator Description
CPU T
486SX-25
487
SX-25
ovmi&#
CX486S2-50
CX.486DX2.50
486SX-33
487SX-33
Overdrive-33
486 DX-33/4U
486 DX2-66
CX486DX2-66
Cwt86S-33/40
CX486DX-33140
—
486 DX-50
CX486
S-50IInsert a 50MHz oscillator m socket
CX486DX-50
different members of the
oscillator,you
lists
the
and
Table 6 Oscillator Configuration
different
their
corresponding
Insert a 25MHz oscillator m
Insert a 33/40MHz oscillator in socket Y2
——
-L
must install an appro-
Figure
members of the 486
486 series of microproces-
@
I*OJ
,
2 for the location
oscillator
frequencies
socket
W.
Y2
@
W
@
\
Figure
3.
486SX-25/33
)
Figure
4 486SX-25/33 Cx486S-33/40/50 Cx486S2-50 PGA CPU Jumper Setting
PQFP CPU Jumper Settings.
I
486SX-25
P
*
486SX-33
JP17
JP18
JP16
JP
J
JP18
,,,7
,,,8
486SX-33
Cx486S-33
4msx-2!s
Cx486S2-5O
,,1,
JP17
Cx486S-40
● ●
Iiiil
. ●
El
g
●
Iiiil
.*
m.
Figure 6 486DX-33/40/50 DX2 50/66, Cx486DX-33/40/50, Cx486DX2-50/66
CX466DX2
JP24
m
● J,,,
● =
lEIE1/
CPU Jumper Setting
4.%
DX-33
~=
JP17
JP18
iia
PGA
CPU Installation
The VESA 486 mainboard
socket which can accommodate any
processoors or P24T in PGA packaging. To install
follow the steps below.
Winning!
v
Incorrect installation
microprocessor. If installation appears
qualified service technician
● Review the unpacking and handling precautions in Chapter 1.
● Carefully remove the microprocessor from its antistatic packaging,
being
careful not to touch
● Examine the
lower left corner of the CPU, and carefully straightened any bent pins.
● Locate the PGA socket on the mainboard and identify the notched
corner of the socket, which
coordinates 1-A
● Position the notched
corner of the PGA socket and align the pins on the CPU over the
socket
● Carefully insert the microprocessor
seat the microprocessor
● Examine the installed CPU to ensure
direction and that the pins are properly aligned.
● After
ensuring
the sections m
generator or oscillator configuration
features
a large
168-pin
PGA
(pin
member
of the 486 series of micro-
can
result in permanent damage to
too
or bend
microprocessor
that the microprocessor is installed correctly, refer to
this
any of the
to identify the positioning notch in the
is
marked with a dot and Welled at
corner
of the microprocessor over the notched
into
all
the way in the socket
the socket Press
it
chapter on CPU type Jumper settings and clock
grid array)
or
upgrade the CPU
difficult
refer the task
to a
pins.
firmly
is installed in the correct
the
to
Figure
7. PGA CPU Installation
J
v If you are inatalling or upgrading to a microprocessor that runs at an
internal clock frequency of over 33MHz (e.g. the 486DX2-50, 486DX2-66,
or 486DX-40/50, it is highly recommended that a CPU cooling
attached to the microprocessor to ensure system stability.
fan
be
2.3 Cache Memory Configuration
The VESA 486 mainboard can support secondary cache memory
of 64kb, 128kb or 256kb Data cache memory is organized mto two
banks, with four SRAM sockets assigned
is
provided for the tag bit If you are installing or upgrading cache
socket
memory on the mainboard, you must set the cache size and type selection
correctly,
Jumpers
appropriate sockets The table below describes the SRAM
socket locations for each supported cache configuration
and install acceptably rated 20ns SRAM
Table 7 Cache
c~yee
Dafa SRAM -
Sockets
to
each bank, a single SRAM
Configuration
Summary
Ta~;~&M
- Cacheable
chips
chip
Range
sizes
m the
type and
128kb
256kb
Jumpers JP14, JP15 and JP21
mainboard for
table and illustrations below for the location of
tag SRAM sockets The SRAM configurations for 64kb, 128kb and
256kb cache memory sizes areas
32k x 8
I
U37-U4C U41
L-
U37-U40, U29-U32
NB
Use
20ns. SRAMS for all configurations
di
fferent cache sizes and types of SRAM Refer to the
Table 8 Cache
Cache
size
JP141BSllmlm
J~,51mlLmlm
I I 3’
—–
-
L
32k X 8
are
3-pm jumpers which configure the
follows
Size
Jumper Settings
64kb 128kb 256kb
!2,
,,,
,?,
,2$
8kx8
-~
32kx8
U41
the
data cache bank and
!2,
,,,
MB
—
64MB
f
Figure
8. 64kb Cache Configuration
Figure
9.
128kb Cache
Configuration
B@
?)
Figure
10.
256kb Cache configuration
2.4 VESA Local Bus Configuration
The VESA 4S6
which
a
wide range of VESA local bus adapters at different system clock
speeds.
Jumper JP19 is a
bus
a 3-pin jumper which allows you to optionally
local bus
JPl
mainboard
features two
local
can
be configured for optimal performance and compatibly with
3-pin
for system clock speeds above
9
and
jumper which allows you to
(the default). Refer to Figure 2 for
JP20 and the VESA
bus master slot
33MH2
(the default). Jumper JP20 is
local bus
slot
extensions.
configure
insert
l-wait-state on the
the Iocation
The tables
extensions,
the 10CSJ
of jumpers
be
low
lists
the correct jumper
Configurations
2.5 Memory Configuration
The VESA 4Sd mainboard allows you to install and expand system
ory
via on-board SIMM (single in-line
mainboard
supports two banks of
DRAM SIMM modules, and
banks are filled. The mainboard requires DRAM with a minimum 80ns
RAS (row address strob access
On board memory is
assigned to each
1 Bank O must be filled before bank 1, and
each bank must be of the same
settings for loud
Table
9.
VESA Local Bus Clock Configuration
l-wd-state
(default)
achieves its
organized
mto two banks, with
bank
Refer to Figure 2 for the location of banks o and
capacity (256kb, lMB or 4MB). The table
bus
clock and
Iw
memory
module) sockets, The .
256kb,
lMB or 4MB fast-page mode’
best performance when both
ime.
four
all
four SIMM modules m
wait-state
mem-
SIMM socket
below lists the memory configurations which are supported by the mainboard
SIMM
To install or upgrade memory follow the steps and refer to the
below
● Review the unpacking and handling precautions m Chapter 1
“‘
● Remove the SIMM from its anti-static wrapping.
● Hold the SIMM so that the chips
● Insert the SIMM connectors mto the socket at a 60-degree angle and
● Slowly move the SIMM to a vertical position until the locking tabs
● Repeat the procedure until all bank sockets are filled
● Run the BIOS Setup program to register the memory you have
Table 11. On-board Memory Configuration
2UB
, 4MB lMB
I
20MB
32MB 4MB 4MB
NB Use minimum 80ns.
lMB I 4MB
DRAM
for
Installation
is
pointed towards the mainboard.
connector
gently move the SIMM back and forth until
snap mto the holes at each end of the module
Installed
are
256kb
256kb
all configurations
illustration
towards you and the edge
it is firmly
seated
Figure 11 SIMM
2.6 Case and Power Connectors
After installing the VESA 4S6 mainboard m the system chassis, you can
attach system components to the mainboard VESA 4S6 maminboard connectors are listed and described below. Many are marked on the mainboard itself for easy reference
Power Connectors:
CN2 consists of two 6-pm male
the dual connectors from the system power supply, as
Refer to Figure 2 for the location of CN2.
CN2
Figure 12.
&’1 Warning!
Q
Reversing
the
mainboard. Make sure
centered
Keyboard
CN1 is a standard S-pm female DIN connector to winch you attach your
keyboard Refer to Figure 2 for the location of
male
before
powering on
Connector: CN1
Istallation
header
connectors to which you attach
illustrated below
Power Supply
Connections
header connectors can result in damage to
that
the
black leads
from your
for
the first time.
power
the system
CN1
supply
the
are
Keyboard Lock and Power LED:
J17
is a 5-pin connector to which You can attach your case’s keyboard
lock and power LED imitator. If your case uses separate connectors for
these two functions, attach the power LED indicator to pins 1-2, and the
keyboard lock to pins 4-5. Refer to Figure 2 for the location of J17.
Speaker Connector: J18
J18 is
a 4-pin connector to which you can attach your case
Refer to Figure 2 for the location of J18
Hardware
Reset
Jl9is a 2-pin connector to which you can attach your case's system reset
switch. Refer to Figure 2 for the location of J19.
External Battery: J20
J20 is a 4-pm connector to which
1 of J20
location of J20.
Turbo
J21
is a 2-pin connector to which you can attach your case turbo switch.
When
enabled
Turbo LED Connector: J22
J22 is a 2-pin connector to which you can attach your case’s turbo LED
indicator.
lights. Refer to Figure 2 for the location of
Switch:
is
positive (+)
and
Switch
Connector:
J21 is
closed by the switch or a jumper cap, turbo operation is
Refer to Figure 2 for the location of J22.
When the turbo switchatJ211s closed the turbo LED indicator
J17
J19
you can attach an external battery. Pin
pin 4
is
negative (-). Refer to Figure 2
J21
J22.
’s
speaker.
for
the
.
20
Hardware Configuration
Chaptar3:
AMI BIOS Setup
3.1 About CMOS Setup
Once the
mainboard
mamboed’s AM I BIOS Setup program to record and/or change configuration information: such as the current date snd time and your hard disk
drive type. The Setup program
and can onfy be accessed when you turn on or reset the system.
The settings you
area of memory called CMOS RAM. This memory is backed up by a battery so thst it will not be erased when you turn off or reset the system.
Whenever you tum on the power, the system reads the settings stored
CMOS RAM end compares them to the equipment check conducted dur-
power
ing the
will be displayed on screen, and you will be prompted to run the Setup
program.
The AMI BIOS Setup program is accessed through a menu which allows
easi
you to
record
basic system information
to
and installed drives. Advanced CMOS Setup gives you access to the
advanced features supported by your system
chip set.
3.2 Entering CMOS Setup
● After powering on the system and in the course of the system POST,
you have the option of entering CMOS Setup.
To enter the Setup program at this time, Press the
display the
illustrated on the next page
● If you do not press these keys at the correct time snd the system boots,
press the
● If you do not press the key at the correct tune snd the system fails to
boot, an
you will again be asked to run the Setup program.
This is
normal.
the system and then enter Setup by pressing the@ key.
AMI BIOS Setup
hss been integrated into a system, you must run tbe
is
stored in
read-only
memory (ROM),
specify
with the Setup program rerecorded in a special
on self-test (POST). If an error occurs, an error message
y configure your system. standard CMOS Setup allows yOU
first
page of the AMI BIOS Setup menu, which is
(7S7)(-)(=>
error
message
Press
regarding
date snd tune, video type
’s
AMI BIOS and mainboard
~
keys to restart the system and try again
will
be displayed (such as keyboard error) and
the
@TX-)(W)
keys at this tune to restart
key.
T
his wilf
After you
in
21
enter
Setup,
You wdl be presented
Setup program, which is pictured below
. Select Standard CMOS Setup to access the Standard CMOS Setup
menu,
● Select Advanced CMOS SeIup to access the Advanced CMOS Setup
menu,
● Select
system values You
that the values have
● Select Auto Configuration with Power-On Defaults to load the default
power-on values, which Disable
serves a
problem You
values
● Select Change Password to access the password security menu,
which is discussed
● Select Auto
the
below
● Select Hard Disk
discussed m section 39 below
●
Select
Setup program You
changes
Figure 13 BIOS Setup Main
AMIBIOS SETUP PROGRAM
(C)1992
American
AUTO
AUTO CC+IF lC~T1Ol
DO NOT
which is
discussed m section 35 below
which is discussed in
Auto
Configuration
will
been
useful diagnostic function
will be
prompted for confirmation, and
have been loaded
m
Detect
Hard Disk to attempt to
correct
hard disk drive type,
Utility
Write to CMOS and Exit
are
written to CMOS and the system reboots
22
with
the
main
menu of the AMI
Menu
-
AMI
BIOS SETUP
megatrends
STANDARD
ADVANCED
Cowrcw,,l
Uuwm ,.ss”930
AUTO DETECT HARD
HARD DISK UTILITY
WRlTETO
WRITE
section
with
be prompted for confirmation, and
loaded
section
37
to access the hard
to save
will
be prompted for confirmation before the
UTILITIES
Inc. All Righte
Reserved
COMS
SETUP
”-
COMS
==
. . . . . . . . ..-
xLN
UITH 010S
OWMJLTS
,“ “Ill!
WUER-a
DEFWLTS
DISK
COMS
AND EXIT
C
OMS
TO
AND ,x,,
36
below
BIOS
Defaults
to load the default
all
performance options This
m the event of a
below
automatically determine
which is discussed
disk utility menu,
your
configuration
‘1
compatibility
notified
m section 38
and exit
AMI BIOS Setup
notified
option
that the
which is
the
. Select Do No/
● A warning message, which
0
3.3 Getting Help
● Help screens are automatically displayed for each option in the
● If you have trouble reading the Setup
Write
configuration and exit the Setup program You will be prompted for
con firmation before the system reboots
select the Standard or Advanced CMOS Setup
If SWt..
Stabdard CMOS setup menu, and can be accessed in the Advanced
CMOS Setup menu by pressing
appear,
selections for that option To
pressing
to CMOS and
Figure 14
MIDI
(c),
wz
,.p,.p.r u..
H.ns4,
R.b..t
b
● nu)of th. ?.11.
(,,
(Iii) Led
Hit
<.x. > t.
similar
to the one pictured below, listing the available
~
for background color and ~ for foreground color
Exit
to cancel any changes to your
is
pictured below, appears each time you
.9/0S Setup
0s
sm
PWGMM - Wknzw
nm.ri.an
I@.trmd.
.+
setup
$“.t..
.“.4 Ent.r
Rlt.r
option.
]
L.M B1OS
S.t.p D.+m.lt.
PmI.r-On D.
step . . . . w
exit
menus.
Warning in fomation
Z-720M
1.= nll Wl$tS
..”
Cu..
Pmbl”. * I
%.tw
..4
Pr”.i
”.”9
R?t.r E“t.rlw S.tuP
t.
●
aw.
Sy.t- Uti
f.”lt.
.rhr .* t.
.=4.t *.-
~
A “POPUP” window
the Help window, press any key
menu,
toggle the menu colors by
--,..~
”9
th.
<ESC>
U-J
\
will
AMI BIOS Setup
23
Figure 15. B/05
Setup Help
-
3.4 using
The following keys snd key combinations are used to
Setup
● To move the
●
Press
●
Press the ~ key to exit back to
. Press
24
Setup
options
and
to
change values.
highlight bar
(or arrow) keys, with the ~ key
menu
~
to restore the
program
was entered
from one
.xmtochangethevshle
values
thst were resided when the Setup
option
to another, use the cursor
turned off.
of an option
the
AMI
Setup
maneuver among
s
ogram's
pr
resin
AMI BIOS
3.5 Standard CMOS Setup
The Standard CMOSSetup menu, which is
to specify the
.4
●
● Hard
.
● Primary
c
following system
Figure 16.
Standard
AMIBIOS
SETUP
(c)l Ysl
(
-/tit./war)
Date
T
ime (
Hard disk
Hard
D type~:
Floppy driv
FICQPU
Wi.ar”
E.*0.rd
ESC:
Date
and time Enter the date and tune, respectively.
types, 46 of which are predestined in the ROM-resident table. If your
hard disk
inter the
precompensation, and landing zone) under type 47, or
Detect Hard
is installed, select Not Installed.
Floppy
is
equipped with If no floppy drive is installed, select Not Installed.
connected to
correct type.
Keyboard. Choose Installed or Not Installed(e.g for a file server), as
appropriate.
American
;y ;
hour/min/sec)
c
**-
Exit 1.1..
disk c:
g
type 47
. USER
I#M#d
a.
n. not
I.AIW
41*1.” UGn/Pco/EGa
I-,.,,-
S*Loct
F2/F3:
color
and D type. The BIOS
type
is not directly supported,
correct
parameters (heads, cylinders sectors, write
Disk
option from the main Setup menu. If no hard drive
drive A and B: Enter the
display. Enter
the type of video display
your
system The AMI BIOS will usually autodetect the
illustrated
configuration
CMOS
SetUp Menu
- S
Megatrends
Inc.
All Rights Reserved
3;~19s2
.gln w Wee. L- sect size
TYPE
7
PU/PD: Modify
supports
you
diskette
configuration your system
below, allows you
information
C
SETUP
D--
648 KB
Ext.
memory
3326 KB
1314
1314 17 76 MB
28 21 22 23
24 25
27 282938312
3 4 5 6 7 ●9
47 fixed disk drive
may need to manually
select
the Auto
adapter
you have
26
2
.
BIOS
Setup
AMI
25
3.6
Advanced
The Advanced CMOS
chipset options, as illustrated and described below.
CMOS Setup
Setup
menu allows you to set various BIOS and
17. Advanced CMOS Setup Menu and
Figure
Default Settings
● Typematic Rate Programming. This
Programming of the keystroke repeat rate, which is adjusted by means
of the next two options.
● Typematic Rate Delay (msecs). If Typematic
Enabled, this optinn allows you to specify the delay
down a kcy and when the character begins
● Typematic Rate (Chu/See). If
Enabled,
this
option allows you to specify the rate at which a
keeps repeating.
character
● Above 1 MS Memory Test. When Enabled this option
memory
above 1 MB to be checked dining the POST. If Disabled,
only the
first
1 MB is
● Memory
audible sound
● Memory Parity Error Check. Tbia option enables or disables BIOS
memory parity error chinking routines
● Hard
running a network operating
system
26
checked during
Test
Tick Smmd. This option enables or
during
the POST
Disk
Type 47 RAM Area. Select 0:300 unless your system is
operations
option
enables or disables
Rate
programming is
repeating
Typematic
Rate Programming
the POST.
memory
trot.
system
which uses the 0300 address for
betweem holding
causes
disables
AMl Blos Setup
is
an
● Waft for <Fl> If Any Error. Disable this option to eliminate the
need for any user response to a non-fatal error condition during the
POST.
● Numeric Processor Test. This option enables or disables a BIOS test
of the numeric processor internal to the 486 DX/DX2, 487SX, P24T
Overdrive series of CPUS during the POST. This option is
and
default.
Enabled by
● Weitek Processor. Tbe VESA 4S6 mainboard does not support a
Weitek processor,
● System Boot Up Sequence. As a general guideline, select A then C
(A:,
C.) if you will normally boot the operating system from a floppy
disk
system from the hard
4
External Cache Memory. This option enables or disables the
secondary external cache on the mainboad You should leave this
option Enabled for
●
Internal
internal set-associative cache You should leave
optimal
for
w
Password Checking Option This allows you to optionally limit
access to the system or to the Setup program alone If you enable
security by selecting Always or
Setup program
●
Video ROM Shadow. This option allows you to shadow the video
BIOS address region from COOOh to C7FFh. Shadow RAM
technique that copies slower 8- or 16-bit ROM BIOS extensions to
faster 32-bit RAM system memory Unless you encounter a
compatibility problem, you should enable video ROM shadowing to
improve performance
Adapter ROM Shadow. These options allow you to shadow 32kb
●
ROM BIOS address ranges
technique that copies slower 8- or 16-bit ROM BIOS extensions to
faster 32-bit RAM system memory If your system includes an
adapter With a BIOS
obtain
assigned
●
AUTO Config Function. When
automatically configures DRAM, cache and 1/0 bus clock settings
based
this
option is therefore set to Absent
Select C then A (C:, A.) if you will normally boot the operating
on detection of the CPU clock speed set this
disk
drive
optimal
Cache Memory. This option enables or disables the
performance
improved
to the
performance
this
option Enabled
Setup,
is
resticted to valid password entry
extension which
performance by shadowing the address range
adapter.
access to the system
from
C800h to C7FFh. Shadow RAM is a
supports shadowing, you may
this
option is Enabled, the-BIOS
CPUs
and/or
option
the
is
a
to
AMI BIOS
.%3tW
27
Disabled to manually set DRAM, cache and I/0 bus clock operating
parmeters.
Note!
a
‘ It
is
highly recommended that
this
function is enabled,
that
the
BIOS
●
DRAM Speed
DRAM read settings The optimal setting depends on CPU clock
speed and the rated access tune of installed DRAM,but as a general
guideline select Fastest for clock speeds of 25MHz or lower, Faster
for 33MHz, Slower for 40MHz, and Slowest for 50MHz
●
DRAM Write CAS Pulse. This option allows you to select between
(column address strobe) delay settings during DRAM
two CAS
cycles, to ensure compatibility with slower DRAM at higher CPU
clock speeds. As a general guideline select
lower,
33MHz or
●
Cache Write Cycle Option. This option allows you to select between
two cache write settings. The
speed,
the speed rating of the SRAM, and the
general
guideline select 2T for clock speeds of 33 MHz or lower,
a
for
clock speeds above 33MHz
select 3T
● Cache Read Cycle
two cache burst read settings. Again, the optimal setting depends on
CPU clock speed, the
cache, but as a general guideline select 1 T for clock speeds of 33MHz
lower,
select 2T
or
configurations, you may need to select 2
memory
below 33MHz because only one bank of data cache memory is filled
●
Bus
Clock Frequency Select. This option allows you to select among
I/O
bus clock speed settings. Possible settings are
eight
and
vary according to, CPU clock speeds so that, for example, at a
CPU clock speed of 33MHz selecting 1/3 CLK would result in a bus
speed
of 11 MHz. The
clock
speed and the speed ratings of installed adapter cards, but as a general
guideline select 7.15
speed of SMHz to ensure compatibility
● Video Cacbeable option. This option puts the most frequently
called video
BIOS routines in cache to improve video efficiency. This
option is Disabled by default, but if no compatibility problems arise
28
the
AUTO Config
then
you must start
correctly
detects
the system
Option. This
option allows you to select among
select 2Tfor clock speeds above 33MHz.
optimal
Option.
This option allows you to select between
speed
rating of the SRAM, and the
for
clock speeds above 33MH2. For 128-kb cache
optimal
MHz
or a setting which will yield a
Function
the system
in Turbo mode
clock speed.
J
T for clock speeds of
setting depends on CPU clock
size
of the cache, but es
“
’2’
setting depends on CPU clock
with
older adapter cards.
be Enabled.
clock
speeds.
write
size
of the
for clock speeds
derived from,
bus
clock
AMI BIOS
SetuP
so
four
If
you may obtain improved performance by setting this option to
Enabled.
The table below summarizes the manufacturer
Advanced CMOS settings for various CPU types end cache memory
sizes supported by your mainboard.
Table
12 Recommended Advanced
:::m?x-::
CPU
P24T-;O
CX486S2-40150
CX486DX2-50
64kb
Cache Size 128kb
DRAM
Fastest
Speed
Option
DRAM
Wrne CAS
Pulse
Cache Wme 2T
cycle Option
Cache
Read
Cycle Option
Bus
Clock
Fre&~y
OSC/clock
generator
IT IT
,T
l/3
CLK CLK
25
MHz
128kb
266kb 266kb
Fastest
Slower
IT IT
2T
2T
lr
IT
I/3 I/4 1/4
CLK
33
MHz MHz
fb32iz
’s
recommended
CMOS
Settings
486DX-40
::4::;si::o c%:;j?.$z
64kb
64kb/128kb/256kb
Slower
Slower
2T
2T 3T
IT 2T(J$U[,)
I/5 1/6
CLK CLK CLK
33
M$z
slowest
(default)
(de;$ultl
(de;:.lt)
h%z
AMI
610s
setup
26
3.7 Changing the Password
If the Password Checking Option under the Advanced CMOS Setup
is set
to either Always or
menu
time the system boots or an attempt
respectively The Change Password menu allows you to change the current password,
as
(c)tmz
illustrated below
Figure 18.
BIOS Password
AMIBIOS SETUP PROGRAM
w.tr.nd.
Setup,
password entry is required every
is
made to enter the Setup program,
Setup Screen
-
CHANGE
PASSWORD
In
,
m night. R.-WOE
EEEEzn
“.. “.
xiw. c 0s.,1
Clur..tw.,
FVSsWorci (he
Esc. Erit
only way to access
discharge
CM~
I
the
system
tempomrzly
● To change the current password, select the Change Password menu
● After entering the correct current password, you will be prompted to
v
4
option from the Setup main menu You wdl be prompted to enter the
old password before gaining access
enter a new password The password can be no longer than 6
characters After entering the new password, you will be prompted to
enter it a second tune for confirmation If the second entry matches
first,
you will be notified that the new password has been installed
the
Nets!
~ya
forget or he
you
andkm
S41P pogram m to d=dmrge the CMOS batiev by
changing fhep?nper settingofJP510
v’
.
30
AMI BIOS %tldp
3.8 Auto Detect Hard Disk
If the Auto Detect Hard Diskmenu is selected from the Setup mainmenu,
the AMI BIOS will attempt to automatically determine the appropriate
drive type and relevant parameters of installed hard disks. The BIOS can
generally obtain the
“I
DE Identify Drive” command However, some IDE drives either do
an
respond
not
with the physical parameters, rather than the manufactures recommended translating parameters. In such cases, you should consult your
hard disk manual for the manufactures recommended drive type and
parameters.
3.9 Hard Disk Utility
If the Hard Disk
will be presented with
Media Analysis.
and
0
v
●
Hard
hard disk. Note that many hard drives are factory low-level formatted,
and should nnt be reformatted. Check with your hard disk
manukactur= before selecting this option
v
● Auto Interleave This option determines the optimum interleave
factor
● Media Analysis.
determine if it is usable If it is unusable, the track is marked as
so that the system
provide
The Hard Disk Utility Media Format screen is pictured below
correct
drive parameters of an IDE drive by issuing
correctly to the “IDE Identify Drive” command, or respond
Utility
menu is selected from the Setup main menu, you
three options:
Hard Disk Format, ‘Auto
Backup!
Performing
any
of
these
operations will
destroy all
data
so be swe to
backup
your
Disk Format. This option
data before
selecting any of
perforns
on
these
a low-level format of the
Winning!
IDE
and SCSI kard drives skould
Refer to
yuw kard disk
HardDisk Utilily
prior to a low-level
This
a list of bad tracks so that this step may not be necessary.
.c4 namalfy be
dealer w manr$acturcr
format of
the
option analyzes each
will
not write data to it. Many manufacturers
hard disk.
Iow-levelfbrmalted
bqbre wing&
track
on the hard disk to
Interleave,
the
hard disk,
options.
AMI
"bad"
AMI BIOS
Sap
31
Figure 19 BIOS
Hand
Disk
Utility
Screen
mmros
SEW —
- M DISK
(C]lssz R99A.mn
1
3.10 Exiting Setup
● To exit Setup, press@ to return to the Setup main menu
● To save your changes and exit Setup, select Write
● TO exit Setup without saving your
CMOS and Exit
32
Ihwtrera.
1= -1
changes, select
UTILITV
fll*~* --
to
CMOS and Exit
Do
Not Write
AMI S10S
11
to
Setup
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