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SERVICE

MANUAL

COLT

286

OCTOBER,

1989

PN-314118-02

C=z

Commodore

SERVICE

MANUAL

COLT

286

OCTOBER,

1989

PN-314118-02

INTERNATIONAL

EDITION

COMMODORE

“INTERNATIONAL

EDITION”

SERVICE

MANUALS

CON-

TAIN

PART

NUMBER

INFORMATION

WHICH

MAY

VARY

ACCORDING

TO

COUNTRY.

SOME

PARTS

MAY

NOT

BE

AVAILABLE

IN

ALL

COUNTRIES.

Commodore

Business

Machines,

Inc.

1200

Wilson

Drive,

West

Chester,

Pennsylvania

19380

U.S.A.

Commodore

makes

no

expressed

or

implied

war-

ranties

with

regard

to

the

information contained

herein.

The

information

is

made

available

solely

on

an

as

is

basis,

and

the

entire

risk

as

to

quality

and

accuracy

is

with

the

user.

Commodore

shall

not

be

liable

for

any

consequential

or

incidental

damages

in

connection

with

the

use

of

the

information

con-

tained

herein.

The

listing

of

any

available

replace-

-ment

part

herein

does

not

constitute

in

any

case

a

recommendation,

warranty

or

guaranty

as

to

quality

or

suitability

of

such

replacement

part.

Reproduction

or

use

without'expressed

permission,

of

editorial

or

pictorial

content,

in

any

matter

is

prohibited.

This

manual

contains

copyrighted

and

proprietary

information.

No

part

of

this

publication

may

be

reproduced,

stored

in

a

retrieval

system,

or

transmitted

in

any

form

or

by

any

means,

electronic,

mechanical,

photocopying,

recording

or

otherwise,

without

the

prior

written

permis-

sion

of

Commodore

Electronics

Limited.

Copyright

©

1989

by

Commodore

Electronics

Limited.

All

rights

reserved.

COLT

286

SERVICE

MANUAL

TABLE

OF

CONTENTS

SECTION

1

—

SPECIFICATIONS

SECTION

2

—

OPERATION

NOTES

SECTION

3

—

TROUBLESHOOTING

GUIDE

SECTION

4

—

PARTS

SECTION

5

—

SCHEMATICS

COLT

286

SERVICE

MANUAL

TECHNICAL

SPECIFICATIONS

COLT

286

AT

Compatible

MEMORY

.

ROM

Autoconfig

BIOS

RAM

on

board

640

kbytes

Base

RAM

RAM

expandable

‘on

board

n/a

on

slots

Yes;

to

15

Mbytes

CPU

Type

80286-12

Clock

speed

6,

8,

12

MHz

80287

Math

Co-processor

Socket

on

board

Number

of

Slots

Two

AT,

one

XT

slots

Operating

System

MS-DOS

3.3

included

KEYBOARD

Number

of

keys

ASCII

101

—

International

102

Type

Enhanced

AT

Numeric

keypad

Yes

Cursor

keys

4

-

inverted

T

layout

Function

keys

12

POWER

SUPPLY

Type

High-efficiency

switching

power

supply

with

integrated

cooling

fan

Maximum

configuration

2

floppy

disk

drives,

one

hard

disk

drive,

3

expansion

cards;

or

1

floppy

supported

disk

drive,

one

hard

disk

drive,

1

tape

unit,

3

expansion

cards

INPUT/OUTPUT

PORTS

RS232C

serial

Built

in

Centronics

parallel

Built

in

Mouse

port

Built

in

for

1352

Mouse

—

Microsoft

bus

mouse

configuration

STORAGE

Floppy

drive

Build

in

controller

supports

one

or

two

drives

Hard

drive

One

AT

hard

disk

built

in

Maximum

internal

Two

half-height

3.5

or

5.25

inch

floppy

disk

drives

and one

half-height

configuration

3.5

inch

hard

disk

drive

VIDEO

EGA

EGA

Wonder800

+

video

card

CGA EGA

Wonder800

+

video

card

MDA

EGA

Wonder800

+

video

card

Hercules

EGA

Wonder800

+

video

card

(See

EGA

Wonder800

+

User’s

Guide

for

video

details.)

COMPATIBLE

MONITORS

EGA,

RGB

Color,

TTL

Monochrome,

Multisync

Monitors

OTHER

FEATURES

Built-in

real-time

clock/calendar

with

battery

backup

External

Configuration

switches

Hardware

Reset

switch

Audio

connector

—

(1V

peak-to-peak;

1

K

ohm

impedance)

provides

external

audio

for

enhanced

sound;

to

be

connected

to

a

monitor’s

pre-amp

circuit.

COMMODORE

ADD-ON

OPTIONS

Second

floppy

disk

drive

1352

mouse

MPS

1250

printer

1402

TTL

monitor

(mono)

xxxx

monitor

(mono)

with

sound

1084

RGB

monitor

(color)

with

sound

EGA

WONDER800®

SPECIFICATIONS

VIDEO

DISPLAY

BUFFER

256K

bytes

SYNC

SIGNALS

.

Separate

horizontal

and

vertical

sync

in

TTL

levels

Horizontal

35kHz

-

MultiSync

monitors

(800x600)

31.5kHz

-

MultiSync

monitors

(640x480)

21.8kHz

-

EGA

monitors

15.75kHz

-

RGB

monitors

18.432kHz

-

TTL

Monochrome

monitors

Vertical

56

Hz

-

MultiSync

monitors

(800x600)

60

Hz

-

MultiSync

monitors

(640x480)

60

Hz

-

EGA

monitors

60

Hz

-

RGB

monitors

s0

Hz

-

TTL

Monochrome

monitors

CONNECTOR

9-pin

D

shell

(Female)

IBM

standard

MONITOR

COMPATIBILITY

TTL

Monochrome

Display

RGB

Color

Display

EGA

Enhanced

Color

Display

MultiSync

monitor

SIZE

5.25"

x4.2"

POWER

+5V

+

5%,

@

0.6

AMP

typical

ENVIRONMENT

COLT

286

SERVICE

MANUAL

Ambient

Temperature

50°

to

122°

F

(10°

to

50°

C)

operation.

32°

to

162°

F

(0°

to

70°

C)

storage

Relative

Humidity

5%

to

90%

non-condensing

operation.

0%

to

95%

storage

BUS

AT

standard

BUS

LOADING

No

more

than

2

LS

TTL

load

CONNECTOR

SPECIFICATIONS

DB9

Connector

Pin

No.

Signal

Ground

Secondary

Red/Ground

Primary

Red

Primary

Green

Primary

Blue

Secondary

Green/Intensity

Secondary

Blue/Mono

Video

Horizontal

Retrace

Vertical

Retrace

vsosauwu

2

WN

-

COLT

286

SERVICE

MANUAL

SECTION

2

NOTES

—

OPERATIONS

GUIDE

COLT

286

SERVICE

MANUAL

OPERATION

NOTES

THE

COLT

286

HARDWARE

CONF

IGURATION

USING

THE

COLT

286

SETUP

UTILITY

n

a

he

builtein

$

ulity

to

give

i

has

finished

booting

and

the

C>

prompt

has

appeared,

you

can

use

the

built-in

Setup

utility

to

giv

a

nem

detailed

information

on

your

COLT

286

configuration.

To

run

the

Setup

utility,

hold

down

the

Control

and

Alt

keys

and

simultaneously

press

the

Esc

key.

The

main

menu

of

the

Setup

utility

will

appear

and

will

look

like

this:

f

Commodore

Setup

Utllity

N

Date

23.08.88

Hard

Disk

Type

Inforgation

:26:26

Time

u

1.444

Type

Cyln Head Sect

W-pc

L-zone

Size

Diskette)

KCNE

1

306

4

17

128

305

10MB

HardDiskl

en

2

615

4

17

30

6ls

20MB

hardDisk2

UNE

3

65

6

17

%0

615

S0MB

Video

SPECIAL

4

90

8

17

5l2

%0

62MB

Coprocessor

NONE

5

4

6

17

512

90

46MB

Baze Heno

60x

6

615

4

17

NONE

615

203B

4

OK

7

42

8

17

256

SL

SON

Extended

Nenory

e

73

5

17

NONE

733

30MB

Base

nenory

found:

640

KB

9

00

15

17

NONE

SOl

112MB

Extended

nenory

found:

000

KB

10

820

3

17

NONE

820

20MB

Use

}.

|toselect

itens

1

855

5

17

NONE

855

35MB

Use

>,

to

select

predefined

12

855

7

17

NONE

855

49MB

values

13

306

8

17

128

319

20MB

Use

<PgDn>

to

vier more

hard

disk

M

73

7

17

NONE

733

42MB

types

s

0000

008

Press

<Esc>

to

abort

SETUP

6

602

417

0

63

20

Press

<End>

to

exit

and

update

\_

Press

Fl

for

secondary

SETUP

window

/

FIGURE

1.

COMMODORE

SETUP

UTILITY

MAIN

MENU

As

.noted

on

the

Setup

screen,

you

can

use

the

cursor

keys

and

the

keyboard

to

define

or

change

the

system

configura-

tion,

as

follows:

°

Use

the

up

and

down

cursor

keys

to

move

from

option

to

option

in

the

main

menu.

°

Use

the

left

and

right

cursor

keys

to

select

the

predefined

entries

for

each

option.

.

°

Use

the

keyboard

to

type

in

any

information

that

is

not

predefined.

°

Use

PgDn

to

display

additional

hard

disk

types

(see

Figure

2).

°

Use

the

F1

key

to

display

the

secondary

setup

window.

°

Use

the

Esc

(Escape)

key

to

abort

Setup.

o

Use

the

End

key

to

exit

Setup

and

update

the

settings.

Following

is

specific

information

about

the

various

Setup

menu

options.

Setting

the

Date

and

Time

for

the

Real

Time

Clock/Calendar

The

COLT

286

has

a

Real

Time

Clock/Calendar

with

a

battery

backup.

This

means

that

once

set,

the

clock/calendar

will

‚keep

the

correct

date

and

time

even

when

the

computer

is

turned

off.

You

use

the

first

two

lines

of

the

Setup

Utility

to

set

the

Real

Time

Clock/Calendar,

as

follows:

Date:

Allows

you

to

set

the

correct

date

into

the

Real

Time

Clock.

This

option

does

not

have

any

predefined

entries;

simply

enter

the

date

from

the

keyboard,

in

the

format

dd/mm/yy.

Time:

Allows

you

to

set

the

correct

time

into

the

Real

Time

Clock,

without

invoking

MS-DOS.

This

option

also

does

not

have

any

predefined

entries;

simply

enter

the

time

from

the

keyboard,

in

the

format

hh:mm:ss.,

where

hh

=00-23,

mm

=00-59

and

ss=00-59.

Setting

the

Floppy

Disk

Drive

Options

vo

can

havea

maximum

of

two

floppy

diskettes

configured

into

your

COLT

286.

The

next

two

Setup

menu

options,

Diskette

1

and

Diskette

2,

allow

you

to

tell

the

system

how

many

floppy

drives

are

available

and

what

type

they

are.

2-1

COLT

286

SERVICE

MANUAL

’

t

these

options:

Here

Diskette

1:

Predefincd

entries:

None,

360

Kb

5.25,

1.2

Mb

5.25,

720

Kb

3.5,

1.44

Mb

3.5.

The

floppy

drive

in

your

COLT

286

is

always

considered

Diskette

1.

Since

COLT

286

is

equipped

with

a

high

density

(1.44

Mb)

drive,

select

1.44

Mb

3.5

for

Diskette

1.

.

:

Predefined

entries:

None,

360

Kb

5.25,

1.2

Mb

5.25,

720

Kb

3.5,

1.44

Mb

3.5.

Ieyouhave

not

installed

a

second

floppy

drive

in

your

COLT

2886,

select

None

for

Diskette

2.

If

you

have

installed

a

second

floppy

drive,

select

whichever

drive

type

(360

Kb

5.25,

1.2

Mb

5.25,

720

Kb

3.5,

1.44

Mb

3.5)

applies

to

the

installed

drive.

Setting

the

Hard

Disk

Drive

Options

Hard

Disk

1

and

Hard

Disk

2,

the

next

two

options

in

the

Setup

utility,

define

how

many

hard

disk

drives

are

available

and

what

kind

of

hard

disk

drives

they

are.

Hard

disk

drives

are

identified

by

a

pre-assigned

Drive

Type

(1,

2,

etc.).

This

number

tells

the

COLT

286

the

drive

manufacturer

and

capacity.

fl

Commodore

Setup

Utility

N

Fr

Default

Systen

Speed

12

MHz

dauhaee

.

6

MHz

Hard

Disk

1/0

DISABLED

Ij_2one

S

Diskette

On

Board

Mouse

ENABLED

Peg

nn

Diskette

2

HardDi

On

Board

COM

3FEH

ST

SCHB

rdDiskl

HardDisk2

On

Board

LPT

SBCH

|

1023

S9B

Video Press

F2

to

return

to

sain

screen

B2

a w

Coprocessor

ro

Base

Menory

640

KB

2

73

5

17

300 733

30MB

Extended

Nenory

000

KB

23

06

4

7

0

336

108

Base

nenory

found:

640

KB

24

805

4

26

0

820

40UB

Extended

zneaory

found:

000

KB

2

1

ji

>

o

o

um

Use

f,

Jtoselect

itens

2

625

527

0

87

AlM

Bande

-

to

select

predefined

28

%5

5

17

0

1000

40MB

293

%5

10

17

l

MB

Use

<PgDn>

to

view

more hard

disk

3

782

:

28

:

on

Sn

types

a

0000

0

2%“

Press

<Esc>

to

abort

SETUP

32

000

0

0

0m

Press

<End>

to

exit

and

update

(Press

Fl

for

secondary

SETUP

window

-)

FIGURE

2.

SETUP

UTILITY

PULLDOWN

MENU

FOR

HARD

DISK

DRIVE

TYPE

Here’s

how

to

define

your

hard

disk

configuration:

Hard

Disk

1:

Your

COLT

286

comes

equipped

with

a

20

MB

hard

disk

drive.

This

drive

is

always

considered

Hard

Disk

1.

The

Drive

Type

for

this

drive

is

shown

on

a

sticker

located

on

the

back

of

your

System

Unit.

Find

this

number

and

type

it

in

after

Hard

Disk

1.

"

The

COLT

286

Setup

utility

includes

a

menu

of

hard

disk

drive

types

with

their

individual

ID

numbers.

You

can

page

through

the

menu

by

pressing

the

PgDn

key.

For

example,

the

opening

Setup

screen

in

Figure

1

lists

drive

types

1

through

16.

If

you

press

PgDn,

the

Setup

screen

will

be

as

shown

in

Figure

2

with

drive

types

17

through

32

listed.

Hard

Disk

2:

This

option

is

not

supported

by

the

onboard

controller.

Other

Setup

Options

on

the

Main

Setup

Screen

Video:

Tells

system

what

the

default

video

is.

Factory-set

default

is

special.

This

will

not

change

even

if

the

EGA

Wonder800

+

Card

setting

changes.

To

change

the

card

setting,

see

the

EGA

Wonder800

+

User’s

Guide.

Coprocessor:

Tells

system

if

an

80287

Numeric

Coprocessor

(NCP)

is

installed.

Factory-set

default

is

zone.

Select

Yes

if

you

have

installed

an

80237

Numeric

Coprocessor.

Base

memory:

Lets

you

customize

base

memory

for

specific

applications.

Extended

Memory:

Disabled.

2-2

COLT

286

SERVICE

MANUAL

Using

the

Secondary

Setup

Window

|

Notice

the

popup

window

shown

at

the

top

of

Figure

2.

This

menu

is

known

as

the

secondary

Setup

window.

You

can

access

this

window

by

pressing

the

Fl

key.

You

can

return

to

the

main

Setup

window

by

pressing

the

F2

key.

The

secondary

window

provides

an

easy

way

to

change

a

number

of

system

parameters

that

are

set

at

startup

by

the

COLT

286’s

AUTOCONFIG

feature.

The

secondary

Setup

window

values

shown

in

Figure

2

are

the

default

values

normally

present

at

system

startup.

The

following

list

shows

all

the

possible

values

for

the

menu

items;

the

default

values

are

underlined:

Default

System

Speed

(6/8/12

MHz)

6

MHz

Hard

Disk

//O

(Disabled/Enabled)

On

Board

Mouse

(Enabled/Disabled)

On

Board

COM

(3F8H/2F8H/OFF)

On

Board

LPT

(@BCH/378H/278H/OFF)

Just

as

with

the

main

Setup

screen

menu,

when

you

are

in

the

secondary

Setup

window

you

can

move

to

an

item

by

using

the

up

and

down

cursor

keys,

and

you

can

set

the

value

of

the

item

by

using

the

left

and

right

cursor

keys.

However,

you

cannot

use

the

Esc

or

End

keys

while

you

are

in

the

secondary

window;

before

you

can

use

these

keys

you

must

first

return

to

the

main

Setup

screen

by

pressing

the

F2

key.

The

Default

System

Speed

item

allows

you

to

select

whatever

system

speed

best

suits

the

particular

hardware/software

configuration

of

your

COLT

286.

For

instance,

if

you

are

using

some

older

software

programs

or

if

you

have

installed

a

slow

speed

(6

MHz)

Numeric

Coprocessor,

these

may

not

run

at

all

or

may

be

unreliable

at

a

system

speed

of

12

MHz.

In

such

cases

you

can

simply

select

the

6

or

8

MHz

clock

speed

as

the

Default

System

Speed.

Note

that

the

6

MHz

Hard

Disk

I/O

value

is

normally

disabled

to

allow

for

the

fastest

possible

data

transfer

to

and

from

the

hard

disk.

You

should

not

have

to

change

this

setting

unless

you

are

using

a

hard

disk

that

cannot

support

high

speed

data

transfer.

You

can

use

the

secondary

Setup

window

to

enable

or

disable

the

on

board

mouse

and

to

select

the

serial

port

(COM)

and

the

parallel

port

(LPT).

SETTING

THE

MICROPROCESSOR

CLOCK

SPEED

The

80286

microprocessor

in

the

COLT

286

is

capable

of

running

at

three

different

clock

(i.e.,

processor

or

CPU)

speeds:

o

Standard

speed

=

6

Mhz

°

Turbo

speed

=

8

Mhz

°

Double

speed

=

12

Mhz

Unless

you

have

changed

the

Default

System

Speed

item

in

the

secondary

Setup

window,

the

COLT

286

is

pre-set

to

run

to

double

speed

(12

MHz)

whenever

it

is

booted.

You

can

switch

between

the

clock

speeds

during

a

session

by

using

special

key

combinations

or

by

using

the

ATSPEED

command.

(NOTE:

If

you

reboot

the

COLT

286,

the

system

speed

will

revert

to

the

default

speed

specified

in

the

Setup

utility.

You

can

reset

the

default

speed

by

using

Ctri-Alt-

Esc

to

access

the

Setup

utility

and

then

using

F1

to call

up

the

secondary

Setup

window.)

To

set

the

clock

speed

from

the

keyboard,

use

these

key

sequences:

°

CTRL-ALT-S

for

standard

speed

(6

MHz)

°

CTRL-ALT-T

for

turbo

speed

(8

MHz)

°

CTRL-ALT-D

for

double

speed

(12

MHz)

Note:

Some

software

may

require

that

you

select

standard

or

turbo

speeds

for

normal

operation.

To

set

the

clock

speed

using

the

ATSPEED

command,

first

make

sure

the

MS-DOS

prompt

is

showing

on

the

screen.

Then

type

the

word

ATSPEED,

followed

by

aspace,

a

dash

(—),

and

then

a

letter

(S,

T

or

D)

denoting

the

desired

speed.

For

instance,

if

you

are

in

standard

speed

and

you

want

to

change

to

turbo

speed

(8

MHz),

type

the

following

and

press

Enter:

ATSPEED

—T

2-3

COLT

286

SERVICE

MANUAL

COLT

286

VIDEO

MODES

The

EGA

Wonder800

+

card

in

the

COLT

286

is

a

high

performance

EGA

graphics

card

from

ATI

Technologies

Inc.,

a

recognized

leader

in

the

video

display

card

field.

Offering

total

flexibility,

the

EGA

Wonder800

+

can

display

all

of

the

major

IBM

PC

software

and

hardware

stan-

dards

—

EGA,

CGA,

MDA

and

Hercules

—

on

any

of

the

major

monitor

types

—

Enhanced

Graphics,

RGB

Color,

TTL

Monochrome

and

Multifrequency

monitors.

The

EGA

Wonder800

+

is

100%

hardware

compatible

at

the

BIOS

and

register

levels.

There

are

no

switches

or

jumpers

to

set

on

the

EGA

Wonder800

+;

special

software

automatically

configures

your

system

at

bootup.

The

EGA

Wonder800

+

software

utilities,

ESETUP

and

ECONFIG,

allow

the

user

to

easily

change

the

computer

selected

default

video

configuration.

.

ESETUP

ESETUP

is

used

to

configure

the

onboard

EEPROM.

The

setup

information

is

retained

even

after

the

power

is

turned

off.

It

is

also

used

to

change

or

store

the

default

information

used

by

the

EGA

Wonder800

+.

It

is

only

necessary

to

use

ESETUP

in

the

following

situations:

e

To

change

the

default

setup

video

mode.

e

To

specify

default

monitor

selection

on

power-up.

To

start

ESETUP,

type

at

the

DOS

prompt:

C>ESETUP

<Enter>

A

menu

like

the

following

will

be

displayed:

ATI

TECHNOLOGIES

INC

ATI

TECHNOLOGIES

INC

A

TI

TECHNOLOGIES

INC

ATI

TECHNOLOGIES

INC

AT

MONITOR

I

TECHNOLOGIES

INC

ATI

TECHNOLOGIES

INC

ATI

SELECTION

©

COPYRIGHT

1989

EGAWONDER800+

ADVANCE

SETUP

PROGRAM

ESETUP

VERSION

xxx

.

POWER

UP

MODE

SELECTION

[DJ

MDA

MONO

GRAPHICS

720X348

[E)

MDA

MONO

GRAPHICS

640X400

[fJ}]

ADJUST

TTL

MONOCHROME

GRAYSCALE

[G)

EXIT

AND

SAVE

CONFIGURATION

Monitor

detected

EGA

Use

<

1}

>

or

<

letter

>

and

<

ret

>

to

select

option,

<

eac

>

to

abort.

NOTE:

Because

of

ongoing

product

improvements,

EGA

Wonder800

+

menus

and

features

may

not

be

exactly

as

shown.

See

the

EGA

Wonder

800

+

User’s

Guide

and

the

software

README

files

for

the

most

current

information.

The

options

in

the

ESETUP

menu

can

be

selected

by

typing

in

the

letter

to

the

left

of

the

selection

and

then

pressing

ne

A

Key.

For

a

full

description

of

the

ESETUP

software,

including

the

individual

options,

see

the

EGA

Wonder800

'ser’s

Guide.

ECONFIG

ECONFIG

is

a

manu-driven

used

to:

©

Change

the

current

video

mode

to

a

different

mode.

.

Automatically

turn

your

screen

display

off

during

long

periods

of

inactivity.

ECONFIG

is

available

on

your hard

disk

drive

and

on

one

of

the

EGA

Wonder800

+

software

diskettes.

2-4