Commodore COLT 286 User manual

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