Octek Panther-II 386SX User Manual

CONTENT

I - I

Challtcr

I

1 N

IHODliCTION

Chapter

2

GENERAL

FEATURES

2-1

Specification

Processor
Ma

t h

Coprocessor

Mcmory

Systcm

I/O

Subsystem

System

functions

Chapter

3

INSTALLING

:2

- I

2-3

2-6

2-8

2-

11

2-12

COMPONENTS

3-1

Installing

80387SX

Math

Coprocessor

3-1

System

Mcmory

Configuration

3-3

Control

or

Systcm

Spccd

3-8

Systcm

Board

Jumpcr

Setting

3-10

S y s t c

III

Il

()

a r d

Connectors

3-\

I

Chapter

4

TECHNICAL

INFOI~MATION

4-1

Memory

Mapping

I/O

Address

Map

System

Timers

System

Interrupts

4-1

4-2

4-4

Direct

Memory

Access

(DMA)

4-7

Real

Time

Clock

and

CMOS

RAM

4-9

CMOS

RAM

Address

Map

4-10

Rea I Tim

e C I 0 c

kin

for

mat

ion

4- I I

System

Expansion

Bus

4-12

APPENDIX

A

SYSTEM

BIOS

A-I

Self-Test

A-I

System

Setup

A-4

APPENDIX

B

OPERATION

&

MAINTENANCE

B-1

Keepi

ng

the

System

Cool

B-2

Cleaning

the

"Golden

Finger"

B-2

Cleaning

the

Motherboard

B-3

APPENDIX

C

SYSTEM

BOARD

LAYOUT

C-l

4-6

Chapter

1

Introduction

The

Panther-II

system

board

is a

high

performance

system

board

that

represents

a

significant

technological

advance

over

the

conventional

3S6SX

designs.

It

offers

an

increased

power

and

flexibility

architecture

by

supporting

S0386SX

processor

speeds

up

to

33

Mhz

(See

NOTE

Oil

pre/ace).

The

design

utilizes

advanced

main

frame

techniques

such

as

two

or

fOllr

way

interlea\'ing

along

with

high

speed

page

mode

capability.

The

Panther-II

orfers

an

inexpensive

entrance

to

3Sb-speciric

applications.

It

combincs

the

abilities

of

the

00386

and

the

S028b

machines.

L

ike

a n 8 0 3 8

()

III

a

chi

II

e,

i t

1)1'

0

l'

e

sse

sill

S t

rue t ion

s

internally

in

32-bit

chunks.

Like

an

80286

III

a e h

inc,

it

(l

per

ate

s

\V

i t h a I

()

-

bit

d a

tab

usa

n d a

24-bit

address

bus.

This

constructions

allows

the

Panther-II

s\'stem

to

rlln

30b

sortware

In

essentially

a

2X6

hardware

environment.

For

the

1lll'I1l!HY

S\<;(elll,

It

SlippurtS

liP

to

I!J

MByte

of

DR.·\i\ls

on

the

S)stc'lll

buard.

System

and

V

ide

0 s

had

0

\\'

i ng

rea

I

LI

res

are

SliP

PP I'

ted

0

~1

a

II

16K

bOll n

dar

i e s

bel

wee n ()

-4

(J

K

and

1M. I

tis

a I s

()

opt

iIII i

zed

t u a I I 0

\\

mix

i

11

g 0 r

[)

R A

1\1

t yp

cs

log i \'

e

end

lIser

the

maximum

flexibility

in

ehuosing

the

correct

memory

capacit~

1'01'

their

applications,

This

flexibility

in

configuration

allows

you

to

select

an

ideal

cost/performance

combination.

I-I

INTRODUCTION

\:

"

';;

~

:

The

Pan

ther-II

is a

fu

II

y

P'C/

A T

compa

ti

ble

~ystem

dboahr.d

i

mplemen

t~dd

h~

ihth

a

f

h j

gh

I Y

A,

Integrate

c IP

sets

to

provl

e Ig

per

ormance,

•

reliability

and

compatibilityl.

,It;·is;:based

Ion

the

386SX

CPU

which

ca n access

the·

,world's,da

rgest

existing

microcomputer

software

,base"

including

the

growing

32-bit

software.

'.

";J

,f

1,:,

,,'

..

'l,;:'

J

...

To

speed

up

the

switching

of

CPU

between

protected

and

real

mode,

a

special

feature

known

as

'OS/2

Optimization'

is

alsorincorporated.

Ifhis

I

provides

an

unique

method

to.

handle;

the,.modc

switching

which

will

improve

the

performancelfor

advanced

operating

system

and

expanded

memory

manager

applications.

;

\-

,:'-l1[1!~'1

':,

i

,

J'

~

< \ ? r ! 1 f

f'.

J!,i'IRegarding

to

the

issueoficompatibility,

Panther-II

system

is

fully

hardware)and,software

compatible

with

associated

PC-AT

pt;QduclS;,

This

mea ns·

; t

hat

..

vi

rt

u

ally

a

11

i!

the

i;

Lh

!l.r

d

war

e j

,I

and

software'that.is

available

for

thed)G/ AT!cant

also

be

run

on, a ·system

you

build

arou,n<!;;the

IPa.nther-;

II

system.!

It,supports

MS-DOS;!

X-ep)x, \ Unixnand

all

PC/AT

application

programs.

Users

can

run

applications

designed

for

the

PC/AT

onlPanther-ll

wi.thout

any,·

modification.

"Multi.:...tasking I and

multhuser

capabilities

are

fullYifunctional;on

this

system

board.

,)d

?:)jlr.~

'ii"

~J I :,~

..

:,

,~

..

'~

'/1

1)

I i

r:

t

~

J

!,:,

'\

;

f::

/ t

';r!1",In

addition,

·the'

rPanther"IId,

provides

stand,a,r.dIISA

expansion

bus,:con~ectors,

so

that

add~on""cards

,developed

for

the,

P.Gi'iAT,·,Will be

full

y,/

functional.

On -boa

rd

PPWe.r.;"good

,generator

is

also

implemented

to

ensure.

the

reliability

of

the

system

and

is

capable

of

working

with

any

1-2

INTRODUCTION

powcr

supplies.

Panther-II

is a perfect

choice

for

CAD/CAM

worksta

tion,

file

server

and

end

user

applications.

It

is

designed

for

the

most

advanccd

computcr-

based

applications

for

today

and

in

the

futurc.

, i

1-3

INTRODUCTION

THIS

PAGE

IS

INTENTIONALLY

LEFT

BLANK

1-4

Chapter

2

General

Features

SPECIFICATION

l)rocessor

Su

IJsystclII

:

Intel

80386SX

CPU

Optional

80387SX

Co-processor

Speed

:

Turbo/normal

speed

Software/hardware

selectable

l\h'lIlory

SUIJSystl'lIl

:

16MB

maximum

lIsing

4M

SIMMs

2MB

using

256Kbx4

DRAM

~hips

Page/Interleave

memory:

Page

mode

memory

2-way

and

4-way

interleave

mode

System

BIOS

shadow

Video

BIOS

shadow

Parity

Check

option

5I2K

Eprom

BIOS

2-1

GENERAL

FEATURES

I/O

Subsystem:

Compatible

to

standard

AT

bus

Four

16-bit

expansion

slots

Two

8-bit expa

nsion

slots

System

Support

Functions:

8-Channel

DMA

(Direct

Memory

Access)

16-level

interrupt

3

programmable

timers

-

CMOS

RAM

for

system

configuration

Real

time

clock

with

battery

backup

-

OS/2

Optimization

(Fast

A20

gate

and

fast

reset)

Other

Features:

On

board

POWERGOOD

test

circuit

External

battery

connector

Hardware

turbo

switch

2-2

la:NEHAL

FEATUHES

PROCESSOR

The

80386SX

Microprocessor

is a 32-bit

CPU

with

a

16-bit

external

data

bus

and

a

24-bit

external

address

bus.

The

386SX

CPU

brings

the

high-performance

software

of

the

Intel386

Architecture

to

mid-range

systcms.

It

providcs

thc

performance

benefits

of

a

32-bit

programming

architecture

with

the

cost

saving

associated

with

16-bit

hardware

systems.

The

386SX

Microprocessor

is

100%

objcct

code

compatible

with

the

386DX,

286

and

8086

microprocessors.

[I

provide

386))X

bascd

systcms

optimized

for

performance

and

386SX

CPU

bascd

systems

optimized

ror

cost.

both

sharing

the

same

operating

SYSICIIlS

and

application

SOfl\\'are.

lJ

n I i k c

the

::'

i\

()

-

has

cds

\'

sIc

III

sag

a

ins I \\'

h i

l'

h i I

com

pet

c s ,

the

.1

i\

(J S.\. i n

her

I I S I h e 3 X

()

,s

pro

tee

I c d

and

virtual

8086

modes

and

internal

32-bit

process

In

g.

Instruction

pipeling.

high

bus

bandwidth.

and

a

very

high

performance

,\LU

ensure

sllort

avcrage

instruction

cxecution

timcs

and

high

system

throughput.

The

386SX

CPU

is

capable

or

execution

at

sllstained

rales

of

2.5-3.0

mi[lion

instructions

per

seculld.

The

i n t e g

rat e dIlle

m

l)

I'

:-

management

unit

(MMU)

includes

an

addrcss

translalion

cache.

a d

van

c e

cI

m u I t i - t

ask

i n g h a r d \\'

arc.

and

a r0 u r - [

eve

I

hardware-enforccd

protection

mechanism

to

support

operating

systems.

The

virtual

machine

2-3

GENERAL

FEATURES

capability

of

the

386SX

CPU

allows

simultaneous

execution

of

applications

from

multiple

operating

systems

such

as

MS-DOS

and

UNIX.

80386SX

is

not

only

an

enhanced

version

of

80286,

but

designed

to

overcome

the

deficiencies

of

80286.

It

allows

you

to

make

use

of

application

software

that

a

286

just

can't

handle.

For

example,

a

very

important

attribute

of

any

multi-tasking/multi-user

operating

system

is

its

ability

to

rapidly

switch

between

tasks

or

processes.

The

386SX

Microprocessor

directly

supports

this

operation

by

providing

a

task

switch

instruction

in

hardware.

The

386SX

Microprocessor

has

two

modes

of

operation:

Real

Address

Mode

(Real

Mode),

and

Protected

Virtual

Address

Mode

(Protected

Mode).

Real

Mode

has

the

same

base

architecture

as

the

8086,

but

allows

access

to

the

32-bit

register

set

of

the

386SX

Microprocessor.

The

complete

capabilities

of

the

386SX

Microprocessor

are

unlocked

when

the

processor

operates

In

Protected

Virtual

Address

Mode.

Protected

Mode

vastly

increases

the

linear

address

space

to

four

gigabytes

and

allows

the

running

of

virtual

memory

programs

of

almost

unlimited

size.

In

addition,

Protected

Mode

allows

the

386SX

Microprocessor

to

run

all

of

the

existing

386DX

CPU,

80286

and

8086

CPU's

software,

while

providing

a

sophisticated

memory

management

and

a

hardware-assisted

protection

mechanism.

(J

Protected

Mode

allows

the

use

of

additional

instructions

specially

optimized

for

supporting

2-4

multitasking

ol)crating

SystClll.

The

380SX

Microprocessor

also

urrers

ruur

levcls

or

protectiun

which

are

optimized

to

support

a

multi-tasking

opcrating

systcm

and

to

isolate

and

protect

user

programs

from

each

other

and

the

operating

systelll.

2-5

GENERAL

FEATURES

MATH

COPROCESSOR

The

demand

for

sophisticated,

number-

crunching

scientific

and

business

applications

has

rapidly

increased

in

recent

years.

80386SX

features

an

integer

Arithmetic

Logic

Unit

which

only

handles

simple

integer

operations

such

as

addition

and

multiplication.

Floating-point

operations

which

are

actually

utilized

by

applications

must

be

accomplished

through

software

routines.

To

overcome

this

obstacle,

external

Math

coprocessor

is

necessary.

The

Math

coprocessor

contains

complex

hardware

and

la~ge

data

registers

for

floating-point

numeric

operations.

The

387SX

Math

CoProcessor

is

an

extension

to

the

Intel

386

microprocessor

architecture.

The

combination

of

the

387SX

with

the

386SX

Microprocessor

dramatically

increases

the

processing

speed

of

computer

application

software

which

utilizes

mathematical

operations.

This

makes

an

ideal

computer

workstation

platform

ror

applications

such

as

financial

modelling

and

spreadsheet,

CAD

IC

AM,

or

gra

ph

ics.

The

387SX

Math

CoProcessor

adds

over

seventy

mnemonics

to

the

386SX

Microprocessor

instruction

set.

Specific

387SX

math

operations

include

logarithmic,

arithmetic,

exponentional,

and

trigonometric

functions.

The

387SX

supports

integer,

extended

integer,

floating

point

and

BCD

data

formats,

and

fully

conforms

to

the

2-6

GENEHAL

FEATUHES

ANSI/IEEE

floating

point

standard.

The

math

coprocessor

offloads

the

complicated

math

functions

from

the

CPU.

Therefore,

it

handles

in

one

instruction

what

would

have

required

many

steps

with

the

CPU.

So

you

can

save

time

on

your

favourite

spreadsheet,

database,

engineering,

scientific

and

graphics

packages.

The

387SX

CoProcessor

is

object

code

compatible

with

the

387DX

and

upward

object

eode

compatible

from

the

80287

and

8087

Math

Co-processors.

In

real-address

mode

and

virtual-8086

mode,

the

386SX

Microprocessor

and

387SX

Math

Coprocessor

is

completely

upward

compatible

with

software

for

the

8086/8087

and

80286/80287

real-

address

mode

systems.

In

protected

mode,

the

386SX

Microprocessor

and

387SX

Math

Coprocessor

is

completely

upward

compatible

with

software

for

the

80286/80287

protected

mode

system.

In

all

modes,

the

386SX

Microprocessor

and

387SX

Math

Coprocessor

is

completely

compatible

with

software

for

the

386

Microprocessor./387

Math

Coprocessor

system.

2-7

GENERAL

FEATURES

MEMORY

SYSTEM

Panther-II

supports

the

use

of

256K,

1M

and

4M

DRAMs

device

configurations

for

up

to

16MB

of

on-board

system

memory.

Both

page

mode

and

interleave

operation

arc

incorporated

on

the

system

board

DRAM.

Page

mode

is

enabled

or

disabled

for

each

pair

of

DRAM

banks

independently.

When

on,

it

is

active

on

all

memory

maps

for

the

enabled

bank

pairs.

Interleaving

requires

pairs

of

banks.

Both

page

mode

and

interleave

arc

automatically

enabled.

One

bank

of

memory

refers

to

as

2

modules

of

SIMM

or

4

pIeces

of

DIP

DRAM.

Detailed

operation

of

each

is

given

in

the

following

sections.

Interleave

Operation

Two-way

interleaving

is

automatically

enabled

whenever

both

memory

banks

of

a

pair

are

populated

with

same

DRAM

types.

If

all

four

banks

are

populated

with

same

DRAMs,

four-way

interleaving

automatically

occurs.

If

the

four

memory

banks

are

not

populated

with

same

DRAMs,

two-way

interleaving

occurs

on

pairs

that

are

of

the

same

type.

In a system

with

three

banks

populated,

the

first

two

banks

perform

two-way

interlea

ve

if

they

are

of

the

same

DRAM

type.

Next

table

2-8

la;Nl';HAL

I,'EATUHI';S

shows

the

automatic

interleaving

options

that

OCClIr

versus

the

nUlllber

ur

populated

banks.

In

the

table,

Bank

0,1,2

and

J

arc

the

designations

r0

rca

c h 0 r

the rou r [)

R

i\

1\1

han

k s.

In

the

co

I u

III

n s

below

these

designators,

"Yes"

or

"Nu",

indicate

whether

the

bank

is

populated.

Aut

0 III a

tic

In'

e r I e a

l'

e v s

1\1

e

111

0 r y

1\1

a p

Bank

Bank

0

1

A

Bank

Address

Mode

2

3

B

Bank

Address

Mode

Yes

No

Linear

No No

N/A

Yes

Yes

2-Way

Interleave

No No

N/A

Yes

Yes

2-

Way

Interleave

Yes

No

Linear

Yes

Yes

2-

Way

Interleave 0 and

l'

Yes Yes

2-Way

Interleave 2 and

3'

This

is

for

the

case

where

Banks

A

and

I3

contain

different

types

of

DRAMS.

If

all

four

banks

contain

the

same

DRAM

type then

four-way

interleaving

is

automatically

activated.

Pagl'

Mode

Operatioll

Memory

Interleaving

operates

independently

of

page

mode.

Page

mode

is

active

whether

one

bank

or

both

arc

populated.

The

page

mode

operation

results

in

no

additional

wait

state

penalty

for

either

reads

or

writes

which

immediately

follow

reads

to

the

same

DRAM

page.

When

pairs

of

banks

are

installed

interleaving

IS

automatically

enabled.

The

2-9

GENERAL

FEATURES

combination

or

page

mode

with

interleaving

results

in

the

best

possible

combination

or

fast

system

memory

operation

using

the

most

cost

effective

DRAMs.

Shadow

RAM

To

further

enhance

the

system

performance,

shadow

RAM

is

supported.

Shadow

RAM

is

a

technique

that

loads

system

BIOS

,video

and/or

adapter

BIOS

from

the

low

speed

EPROM/ROM

directly

into

fast

DRAM

during

boot-up

of

the

computer.

The

execution

of

the

BIOS

then

will

have

significant

improvement

because.

access

to

DRAM

is

much

faster

than

ROM.

Memory

Remapping

If

shadow

RAM

is

not

used

at

memory

area

ODOOOOH:OEFFFFH,

remapping

is

possible.

Then,

local

memory

areas

OAOOOOH:OBFFFFH

and

ODOOOOH:OEFFFFH

(each J28K

bytes)

arc

mapped

to

the

top

of

total

memory

for

it

to

be

used

as

extended

memory.

Memory

areas

OFOOOOH-

OFFFFFH

(system

BIOS)

and

OCOOOOH-OCFFFFH

(video

BIOS)

are

reserved

for

shadow

RAM.

2-10

I/O

SlJBSYSTEl\1

It

IS

vcry

important

that

a

high

speed

system

should

be

compatible

with

existing

peripherals

without

downgrading

the

perrormance.

The

Panther-II

system

is

exactly

designed

with

this

capability

in

mind.

To

be

compatible

with

the

existing

add-on

cards,

user

has

the

option

of

defining

the

I/O

speed.

If

for

example,

the

peripheral

card

is

not

capable

of

operating

at

high

speed,

user

can

define

a

slow

speed

for

I/O

slot

operation

while

still

maintain

the

rest

of

the

system

at

very

high

speed.

2-11

GENERAL

FEATURES

SYSTEM

FUNCTIONS

System

functions

include

Interrupt
DMA
Timer
Real

time

clock

Clock

and

ready

generation

I/O

channel

control

All

system

functions

are

[00%

compatible

to

AT

standard.

I/O

channel

of

Panther-II

is

designed

to

be

compatible

with

standard

AT

bus.

All

the

expansion

cards

conformed

to

the

standard

AT

bus

can

be

used

in

Panther-II

without

problelll.

2-12

Chapter

3

Installing

Conlponents

Warning:

Be

sure

lo

IItl'/l

0[[

Ihc

cOmpIlICl"S

power

swilCh

he

[ore

i/lstallillg

or

I'C

placing

{IllY

componcnt.

I[

illstal/a/io/l

sOlillds

ri.,"-.!',

/1'/

.1'0111'

dCIII"I'

inslall

the

80387SX.

I[

YOIl

make

a

nlisLake.

rOil

cOllld

damage

Ihe

8U387SX

or

.)'0111'

cOli/pilleI'.

INSTALLING

80387SX

~lATH

COPROCESSOR

Math

coprocessor

80387SX

is

available

in

a

68-pin

PLCC

package.

Find

the

80387SX

socket

on

the

s ys t e

111

boa

rd.

it's I()

cat

e d

()

11

U I

(1

a t

the

cor

n e r

of

the

motherboard.

The

socket

is a 6S-pin

PLCC

socket,

align

the

chip

so

that

its

orientation

mark

matches

up

with

that

of

the

socket.

When

you

arc

sure

the

pins

arc

aligned

correctly.

press

firmly

and

evenly

on

the

80387SX

into

the

socket.

Make

sure

that

the

coprocessor

is

firmly

inserted

into

the

socket.

The

speed

rating

of

80387SX

should

match

that

of

the

system

speed

for

a

optimum

and

reliable

operation.

Refer

to

the

table

below

to

determine

the

correct

speed

rating

of

the

80387SX.

I

Panther-II

I

Ma

t h

Coprocessor

I

33

Mhz

System

80387SX-33

25

Mhz

System

80387SX-25

20

Mhz

System

80387SX-20

16

Mhz

System

80387SX-16

3-1

INSTALLING

COMPONENTS

Orientation

Marv

o

80387SX

Coprocessor

Orientation

Mark

1'-1

u

mer

icC

0 pr-0 C eS S 0 r

Soc

vet

3-2

INSTALLING

COMPONENTS

SYSTEM

I\1EMOHY

CONFIGURATION

Four

DIP

memory

banks

and

two

SIMM

memory

banks

are

available

on

Panther-II,

these

memory

banks

arc

designated

as

BANK

0

to

BANK

3

in

the

Illotherboard.

User

has

the

option

or

either

uSing

DIP

type

DRAM

or

SIMM

type

memory

modules.

Still

if

the

user

prefers,

he

could

usc

both

types

together.

That

means

you

could

make

usc

of

DIP

and

SIMM

type

memory

simultaneously.

Please

note

that

however,

you

cannot

install

both

memory

types

marked

with

the

same

bank

reference.

For

example

if

you

had

already

installed

DIP

memory

into

'BANK

0',

you

can

no

longer

install

SIMM

into

the

memory

modules

referenced

as

'BANK

0'.

One

bank

of

memory

rerers

to

2

SIMM

modules

or

6

DIP

memory

chips

(4x44256

+

2x41256).

For

the

SIMM

memory,

user

can

install

256K,

1M

or

4M

SIMM;

therefore

it

has

a

maximum

memory

capacity

of

16

Megabytes.

On

the

other

hand;

if

purely

DIP

DRAM

are

used,

it

will

allow

up

to 2 Megabytes

of

memory.

The

DIP

DRAM

are

organized

in

4

banks

as

shown

in

next

page:

3-3

.f

INSTALLING

COMPONENTS

DIP

DRAM

Memory

Organization

IMemory

BanklDIP

Memory

LocationlDRAM

Size

I

BANK

0

U39, U40,

U41,

U42

44256

U38,

U37

(parity)

41256

BANK

I

U33, U34,

U35,

U36

44256

U32,

U30

(parity)

41256

BANK

2

U26,

U27,

U28,

U29

44256

U31,

U24

(parity)

41256

BANK

3

U20,

U21,

U22,

U23

44256

U25,

UI9

(parity)

41256

U38,U37, U32,U30,

U31,U24

&

U25,U19

are

the

parity

bits

for

BANK

0

to

BANK

3

respectively.

In

normal

situation,

those

bits

are

not

needed

and

the

parity

checking

logic

can

bc

disabled.

Hence,

the

user

can

left

those

sockets

unpopulated

and

thus

allowing

you

to

minimize

the

system

cost.

There

are

several

combinations

of

DRAM

types

you

may

consider.

So, a basic

system

can

be

equipped

with

fewer

memory

and

later

more

memory

can

be

added

when

upgrading

the

system.

As

a

typical

case,

a

basic

system

can

be

equipped

iiI

with

2

Megabyte

memory

using

1MB

SIMM

and

WI

t.

hen

m e m 0 r y S i z

cis

I

ate

rex

pan d edt

0 I 0

Megabytes

by

putting

another

banks

or

4M

SIMM.

3-4

INSTALLlN(;

COMPONENTS

The

memory

size

IS

detected

automatically

by

system

BIOS

and

indicated

after

power

up.

No

switches

or

jumpers

are

required

to

be

set

for

the

memory

size

and

DRAM

type.

The

different

configurations

of

memory

is

illustrated

in

the

next

table.

It

shows

the

page

mude,

interleave

options

and

the

DRAM

combinations

available

for

each

possible

memory

map.

Since

interleaving

requires

pairs

of

banks,

various

controls

described

act

on

memory

in

bank

pairs.

The

short

hand

nutatiun

Bank

A

is

used

when

describing

something

that

affects

memory

banks

0

and

I

as

a

set.

Similarly,

Bank

13

is

llsed

to

describe

memory

banks

2

and

3

as

a

set.

Mcmory

Configuration

Tal>lc

16-Bit

DRAM

Banks

Page/Interleave

Total

Bank

0

Bank

1

Bank

2

Bank

3

A

B

Memory

256K

256K

2/P

10MB

256K

256K

25GK

256K

4!P

4/P

2.0MB

1M

Page

2.0MB

1M

1M

2/P

4.0MB

1M 4M

Page

10.0MB

4M

4M

2/P

16.0MB

3-5

INSTALLING

COMPONENTS

Installing

SIMM

Modules

Whenever

adding

memory

modules

to

the

motherboard,

install

2

modules

at

a

time.

Also

make

sure

that

the

SIMM

is

installed

in

the

correct

orientation,

the

RAM

chips

on

the

modules

should

be

facing

the

I/O

slot.

See

the

figure

on

next

page

for

illustration.

To

install

a

module,

the

module

edge

should

angled

into

the

socket's

contact

and

then

the

module

is

pivoted

into

position,

where

the

locking

latches

will

secure

it.

If

the

module

edge

is

not

completely

inserted

into

the

socket,

it

cannot

be

pivoted

to

be

in

vertical

position

and

should

be

dragged

out

and

inserted

again.

Do

not

force

the

module

into

the

SIMM

sockct.

It

will

damage

the

locking

latches.

The

modules

should

be

locked

by

the

locking

latches

of

the

sockets

firmly.

Please

check

carefully

before

turning

on

the

power.

Otherwise,

the

system

will

not

work

properly.

3-6