Fox FOX-III 286 User manual
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RADIO
FREQUENCY
INTERFERENCE
STATEMENT
This
equipment
frequency
energy
properly,
tha
tis,
generates
and
uses
radio
and
if
not
installed
and
used
in
strict
accordance
with
the
manufacturer's
instructions,
may
cause
interference
with
radio
and
television
reception.
If
this
equipment
does
cause
interference
to
radio
or
TV
reception,
which
can
be
determined
by
turning
the
equipment
off
and
on,
the
user
is
encouraged
to
try
to
correct
the
interference
by
one
or
more
of
the
following
measures:
*
*
*
*
*
*
*
Reorient
the
receiving
antenna.
Relocate
the
computer
away
from
the
receiver.
Move
the
computer
away
from
the
receiver.
Plug
the
power
cord
of
computer
into
a
different
outlet
so
that
computer
and
receiver
are
on
different
branch
circuits.
Ensure
that
card
slot
covers
are
in
place
when
no
card
is
installed.
Ensure
that
card
mounting
screws,
attachment
connector
screws,
and
ground
wires
are
tightly
secured.
..
If
peripherals
are
used
with
this
system,
it
is
suggested
to
use
shielded,
grounded
ca
bles,
with
in-line
filters
if
necessary.
If
necessary,
the
user
should
consult
the
dealer
service
representative
for
additional
suggestions.
The
man
ufacturer
is
not
responsi
ble
or
TV
interferences
ca
used
by
modifications
to
this
equipment.
responsibility
of
the
user
to
interferences.
for
any
radio
unauthorized
It
is
the
correct
such
OPERATION AND MAINTENANCE
THIS
PAGE
IS
INTENTIONALLY
LEFT
BLANK
B-4
Preface
This
manual
covers
the
necessary
information
to
operate
the
FOX-III
system
board.
In-depth
explanations
of
the
functions
of
the
motherboard
are
provided.
The
table
of
contents
gives
detailed
information
about
the
arrangement
of
this
manual.
The
system
BIOS
setup
is
further
discussed
in
the
appendix.
The
content
in
this
manual
is
only
for
reference
and
is
intended
to
provide
basic
information
for
the
general
users.
There
are
also
technical
information
provided
for
hardware
and
software
engineers.
The
manual
compose
of
4
chapters,
chapter
contains
a
brief
introduction
of
FOX-III
motherboard.
In
the
chapter
2,
specifications
and
functions
of
FOX-III
are
discussed.
It
also
outlines
many
advanced
features
of
the
CPU
and
the
system
architecture.
Chapter
3
deals
with
the
installa
tion
of
coprocessor,
DR
AM
mod
ules,
jumpers
and
the
memory
configurations.
Technical
information
is
provided
in
the
chapter
4.
System
BIOS
and
the
system
further
described
in
the
appendix
A.
procedures
are
explained.
setup
are
A
11
setup
Note
FOX-III
is
available
in
three
versions,
12MHz,
16MHz
and
20MHzj
which
are
further
classified
into
2
categories
-
with
or
without
memory
modules.
Features
and
functions
described
in
the
manual
is
identical
for
each
version
except
for
their
operating
frequencies
and
memory
configurations.
OPERATION
AND MAINTENANCE
KEEPING
THE
SYSTEM
COOL
Airflow
is
critical
for
proper
operation.
The
motherboard
contains
many
high-speed
components
and
they
will
generate
heat
during
opera
tion.
Other
add-on
cards
and
hard
disk
drive
can
also
produce
a
lot
of
heat.
As a
result,
the
temperature
inside
the
computer
system
may
be
very
high.
These
boards
require
cool
air
to
prevent
a
deadly
heat
build-up.
Be
sure
that
all
cooling
vents
in
the
front
or
sides
of
the
computer
are
open
and
that
air
circulation
is
good.
Check
the
clearance
at
the
back
of
the
computer;
the
power
supply
contains
a
fan
to
blow
air
out
of
the
case,
make
sure
the
fan
is
not
blocked
by
cables
or
papers.
Don't
push
your
computer
flush
against
the
wall;
leave
it
some
brea
thing
space.
Heat
can
destroy
computer
chips.
CLEANING
THE
"GOLDEN
FINGER"
Whenever
inserting
an
add-on
card
to
the
motherboard,
make
sure
that
there
is
no
dirt
on
the
"golden
finger"
of
the
add-on
card.
If
not,
the
contact
between
the
"golden
finger"
and
the
slot
may
be
poor
and
thus
causing
the
add-on
cards
to
work
improperly.
Use
a
pencil
eraser
to
clean
the
"golden
finger"
if
dirt
is
found.
B-2
CONTENT
Chapter
1
INTRODUCTION
Cha
pter
2
GENERAL
FEA
TURES
Specifica
tion
Processor
Ma
th
Coprocessor
Memory
System
I/O
Subsystem
System
Functions
1- 1
2-1
2-1
2-3
2-6
2-8
2-10
2-10
Chapter
3
INSTALLING
COMPONENTS
3-1
Installing
80287
Math
Coprocessor
3-1
Installing
System
Memory
3-4
System
Memory
Configura
tion
Control
of
System
Speed
System
Board
Jumper
Setting
System
Board
Connectors
3-5
3-10
3-11
3-12
SYSTEM
BIOS
Diagnostics
Option
Menu
You
may
note
the
following
in
the
Diagnostics
main
men
u:
A-18
The
top
line
with
title
copyright
message
and
the
military
format.
of
the
program,
date
and
time
in
ROMDIAG
Options
Line
with
the
devices/
adapters
supported
by
the
program.
They
are:
Hard
Disk,
Floppy
disk,
Keyboard,
Video
and
Misc.
Each
device
option
in
the
diagnostics
option
line
has
its
own
test
option
window
which
is
displayed
when
the
particular
device
is
highlighted.
Diagnostics
Option
Window.
Below
the
diagnostics
option
line,
the
diagnostics
option
menu
for
that
option
is
displayed.
The
Help
Window
in
Reverse
Video
specifying
usage
of
keys.
The
bottom
line
with
a
short
Message
describing
the
test
under
the
Block
Cursor.
CHAPTER
1
INTRODUCTION
The
FOX-III
system
board
is
a
cost-
effective,
mid-range
performance
system
board
tha
t
is
designed
for
PC/
AT
compa
ti
ble
applica
tion.
It
offers
an
increased
power
and
flexibility
architecture
by
supporting
80286
processor
speeds
up
to
20
MHz.
(See
NOTE
on
PREFACE)
For
the
memory
system,
it
is
configurable
from
512 K
to
4
MByte
of
DRAMs
on
the
system
board
with
true
"0"
wait
state
DRAM
accesses.
Harnware
EMS
is
implemented
with
4
registers.
In
addition
to
it,
System
and
Video
shadowing
fea
tures
are
also
supported
in
16K
blocks.
It
is
also
optimized
to
allow
mixing
of
DRAM
types
to
give
end
user
the
maximum
flexibility
in
choosing
the
correct
DRAM
capacity
for
their
applications.
This
flexibility
in
configuration
allows
you
to
select
an
ideal
cost/performance
combination.
FOX-III
is
a
full
y
PC
/ AT
compa
ti
ble
system
board
implemented
with
a
highly
integrated
chip
sets
to
provide
high
performance,
reliability
and
compatibility.
This
means
that
virtually
all
the
hardware
and
software
that
is
available
for
the
PC/
AT
can
also
be
run
on
a
system
you
build
around
the
FOX-III
system.
It
supports
MS-DOS,
Xenix,
Unix
and
all
PC/AT
application
programs.
Users
can
run
appliea
tions
designed
for
the
PC/
AT
on
FOX-III
without
any
modification.
Multi-
tasking
and
multi-user
capabilities
are
fully
functional
on
this
system
board.
1-1
SYSTEM BIOS
EXITING
CMOS
SETUP
After
you
have
entered
the
correct
values
to
all
of
the
SETUP
options,
you
may
now
exit
the
SETUP
program.
To
do
so,
press
<ESC>
key
to
exit.
The
following
message
will
then
appear
Write
data
into
CMOS
and
exit
(Y
/N)?
Press
Y
to
update
the
data
and
exit
the
SETUP
program.
The
computer
now
performs
a
cold
boot
(equivalent
to
turning
the
power
off
and
back
on
again),
performs
the
memory
test,
and
then
tries
to
boot
from
the
disk
drive.
If
your
hard
disk
has
not
yet
been
initialized,
be
sure
that
you
have
a
bootable
DOS
diskette
in
the
A
drive.
A-16
CHAPTER
2
GENERAL
FEATURES
SPECIFICATION
Processor
Subsystem
80286
CPU
Optional
80287
co-processor
Speed:
Turbo/normal
speed
Software/ha
rd
wa
re
selecta
ble
Memory
Subsystem:
4MB
using
IM
SIMMs
1MB
using
256Kbx4
DRAM
chips
or
256K
SIMMs
Support
memory
mixing
of
256K
and
1M
System
BIOS
shadow
Video
BIOS
shadow
Hardware
EMS
implementation
128K
or
256K
Eprom
BIOS
o
or
I
wait
state
selectable
2-1
SYSTEM BIOS
the
base
memory.
Generally,
the
former
option
is
appropriate.
If
the
hard
disk
type
47
is
defined
or
if
you
run
program
like
OS/2,
select
the
option
2.
OPTION
8
MAIN
BIOS
SHADOW
Main
BIOS
Shadow
can
be
selected
in
this
men
u.
If
you
have
system
memory
of
I MB
or
more,
enable
Main
BIOS
shadow
for
a
more
efficient
system.
The
Main
BIOS
will
be
shadow
at
FOOOOh.
You
can
not
ena
ble
this
option
if
your
system
memory
is
less
tha
n 1MB.
a)
Disa
bled
*
b)
Enabled
OPTION
9
Fast
I/O
BUS
speed
This
option
provides
a
way
to
speed
up
the
I/O
operation,
however
care
should
be
exercised
in
setting
this
option.
Make
sure
that
the
peripheral
cards
are
capable
of
operating
at
high
speed
before
making
changes,
otherwise
problems
could
arise.
It
is
therefore
strongly
recommended
that
this
option
be
disabled.
a)
Disabled
*
b)
Enabled
A-14
GENERAL
FEATURES
PROCESSOR
The
80286
is
an
advanced,
high-performance
microprocessor
with
specially
optimized
capabilities
for
multiple
user
and
multi-tasking
systems.
The
80286
has
built-in
memory
protection
that
supports
operating
system
and
task
isolation
as
well
as
program
and
data
privacy
wi
thin
tasks.
The
80286
includes
memory
management
capabilities
that
map
230
(one
gigabyte)
of
virtual
address
space
per
task
into
224
bytes
(16
mega
bytes)
of
ph
ysical
memory.
The
80286
is
upward
compatible
with
8086
and
8088
software.
Using
8086
real
address
mode,
the
80286
is
object
code
compatible
with
existing
8086,88
software.
In
protected
v
irtual
address
mode,
the
80286
is
source
code
compatible
with
8086,
88
software
and
may
require
upgrading
to
use
virtual
addresses
supported
by
the
80286's
integrated
memory
management
and
protection
mechanism.
Both
modes
operate
at
full
80286
performance
and
execute
a
superset
of
the
8086
and
88
instructions.
The
80286
provides
special
operations
to
support
the
efficient
implementation
and
execu
tion
of
opera
ting
systems
..
For
example,
one
instruction
can
end
execu
tion
of
one
task,
save
its
sta
te,
switch
to
a
new
task,
load
segmen
t-not-
present
exception
and
restartable
instructions.
The
80286
operates
in
two
modes:
protected
virtual
address
and
real
address.
2-3
SYSTEM
BIOS
When
you
install
a
new
hard
disk,
make
sure
whether
it
is
already
formatted.
If
not,
the
BIOS
has
to
check
for
a
while
before
reporting
the
hard
disk
error.
In
fact,
the
error
arises
only
because
the
hard
disk
is
not
formatted.
If
the
hard
disk
is
formatted,
you
can
run
DOS
FDISK
and
DOS
FORMAT.
Some
fixed
disks
are
specially
handled
and
must
be
set
to
'Not
Installed'.
Consult
the
fixed
disk
manual
for
details.
OPTION
4
DISPLAY
Four
types
of
display
are
supported:
1.
eGA
8D
column
mode
2.
eGA
40
column
mode
3.
EGA
and
VGA
4.
Monochrome
If
the
type
of
display
is
incorrect,
the
BIOS
will
prompt
you
and
ask
you
to
set
up
again.
But
the
BIOS
is
still
able
to
display
messages
on
the
display
attached
to
the
system.
Thus
you
can
enter
the
setup
program.
The
jumper
JP2
must
be
set
according
to
this
setting.
Otherwise,
the
BIOS
will
report
error
after
self-test.
A-12
GENERAL
FEATURES
Real
Address
Mode
In
this
mode,
physical
memory
is a
contiguous
array
of
up
to
I
megabyte.
The
selector
portion
of
the
pointer
is
interpreted
as
the
upper
16
bits
of
a
20-bit
address,
and
the
rema
ining
4
bits
are
set
to
zero.
This
mode
of
operation
is
compatible
with
the
8088
and
8086.
Segments
in
this
mode
are
64KB
in
size
and
may
be
read,
written
or
executed.
An
interrupt
may
occur
if
data
operands
or
instructions
attempt
to
wrap
around
the
end
of
a
segment.
In
this
mode,
the
information
contained
in
the
segment
does
not
use
the
full
64KB,
and
the
unused
end
of
the
segment
may
be
overlay
by
another
segment
to
reduce
physical
memory
requirements.
2-5
SYSTEM
BIOS
CMOS
SETUP
OPTIONS
Following
is a
detail
explanation
of
each
CMOS
Setup
option.
OPTION
I
TIME
AND
DATE
Use
PgUp
and
PgDn
keys
to
change
the
value.
The
date
and
time
cannot
be
entered
directly.
A
calender
is
displayed
on
the
lower
right
corner
of
the
screen
for
your
reference.
OPTION
2
FLOPPY
DISK
DRIVE
Four
types
of
floppy
disk
d r i
ves
are
supported:
1.
5-y,
inch
standard
drive
(360K)
2.
5-y,
inch
high-density
drive
(1.2M)
3.
3-'h
inch
standard
drive
(720K)
4.
3-y,
inch
high-density
drive
(1.44M)
The
system
BIOS
supports
two
floppy
disk
drives
and
they
are
recognized
as
drive
A
and
B.
Select
the
correct
types.
Otherwise
the
drives
cannot
work
properly.
If
one
of
them
is
not
installed,
select
'Not
Installed'
for
that
drive.
A-IO
GENERAL
FEATURES
OP
codes
and
operands
through
these
I/O
ports.
The
microprocessor
also
receives
and
stores
results
through
the
same
I/O
ports.
The
"BUSY"
signal
generated
by
the
coprocessor
signifies
to
the
microprocessor
to
wait
un
til
the
coprocessor
has
finished
executing.
The
following
describe
the
mathematics
coprocessor
control
ports:
OFO
The
latched
Ma
thema
tics
Coprocessor
busy
signal
can
be
cleared
with
an
8-
bit,
Out
command,
to
port
FO.
The
coprocessor
will
latch
"BUSY",
if
it
asserts
its
error
signal.
Data
output
should
be
zero.
OF]
The
Mathematics
Coprocessor
will
reset
to
real
address
mode
which
is
in
the
8087
compatible
if
an
8-
bit
Out
command
is
sent
to
port
Fl.
Again,
the
data
output
should
be
zero.
2-7
SYSTEM
BIOS
Once
you
have
entered
the
SETUP
menu,
enter
the
date,
time,
the
primary
display
type,
the
floppy
drive
installed
and
the
hard
disk
drive
type
(if
installed).
The
SETUP
program
will
automatically
determines
your
computer's
memory
configuration
and
displays
it
on
the
SETUP
menu.
A-8
GENERAL
FEATURES
memory
is
installed,
it
also
support
relocation
of
memory
from
address
AOOOO
to
address
FFFFF
that
are
not
used
in
shadowing
to
above
1M.
The
following
table
shows
the
various
shadowing
and
relocation
combina
tions.
Shadow
Range
Relocated
Relocation
Range
Memory
No
shadowing
AOOOO-FFFFF
384K
COOOO-
AOOOO-BFFFF
128K
DOOOO-
AOOOO-CFFFF
192K
EOOOO-
AOOOO-DFFFF
256K
FOOOO-
AOOOO-EFFFF
320K
COOOO-CFFFF,
AOOOO-EFFFF,
256K
FOOOO-FFFFF
DOOOO-EFFFF
2-9
SYSTEM BIOS
CHAPTER
3
CMOS
SETUP
INST
ALLING
COMPONENTS
Note:
The
BIOS
may
be
updated
from
time
to
time,
the
one
you
got
may
not
be
exactly
as
discussed;
this
section
will
also
be
updated
as
necessary.
Follow
the
instructions
as
they
come
up
on
the
screen
to
complete
the
initial
procedure.
The
initial
prompt
on
the
screen
tells
you
to
press
the
<DEL>
key
if
you
want
to
use
the
setup
program.
It
is
displayed
briefly
just
after
the
RAM
test
is
run
when
you
first
turn
on
the
system.
If
it
disappears
before
you
have
a
chance
to
respond
turn
the
system
off
and
on
again
or
reset
the
system
and
the
message
will
reappear.
The
initial
screen
prompt
will
be
similar
to:
Press
<DEL>
key
if
you
want
to
rUIl
SETUP
or
DIAGS
Hit
<DEL>
key
to
get
into
the
Setup
Mode.
(Note
that
<DEL>
key
will
get
you
into
the
setup
mode,
only
when
the
above
message
is
displayed
on
the
screen.)
Upon
your
pressing
of
the
<DEL>
key,
the
following
message
will
appear
on
the
screen:
A-6
EXIT
FOR
BOOT
RUN
CMOS
SETUP
RUN
DIAGNOSTICS
Warning:
Be
sure
to
turn
off
the
computer's
power
switch
before
installing
or
replacing
any
component.
If
installation
sounds
risky,
let
your
dealer
install
the
80287.
If
you
make
a
mistake,
you
could
damage
the
80287
or
your
computer.
INST
ALLING
80287
MATH
COPROCESSOR
The
speed
ra
tin
g
of
80287
Ma
th
coprocessor
should
match
that
of
the
system
speed
for
an
optimum
and
reliable
operation.
Refer
to
the
table
below
to
determine
the
correct
speed
rating
of
the
80287.
I
FOX-III
I
Ma
th
Coprocessor
I
20MHz
System
80287-10
16MHz
System
80287-10
12MHz
System
80287-8
3-1
SYSTEM
BIOS
The
other
type
of
errors
are
serious
fail
ure
and
are
conveyed
as
a
number
of
beep
and
repeated
infinitely.
Beep
Count
Meaning
1
DRAM
Refresh
Failure
3
Base
64K
Byte
Memory
Failure
4
System
Timer
Failure
5
Processor
Failure
6
Keyboard
Controller
-
Ga
te
A20
Fail
ure
7
Virtual
Mode
Exception
Error
9
ROM-BIOS
Checksum
Failure
If
no
error
is
found
during
self-test,
the
system
BIOS
will
proceed
to
boot
from
floppy
disk
or
hard
disk.
The
system
BIOS
will
list
the
system
configuration
on
the
screen
similar
to
below.
System
Configuration
(C)
Copyright
1985-1990,
American
Megatrends
Inc.,
Main
Processor
: 80286 Base
Memory
Size : 640
KB
Numeric
Processor
: None
Ext.
Memory
Size :
OKB
Floppy
Drive
A: : 1.2
MB,
5V."
Hard
Disk C:
Type
: 2
Floppy
Drive
B: : 1.44MB,
3Y."
Hard
Disk D:
Type
: None
Display
Type
:
VGA
or
EGA
Serial
Port(s)
: None
ROM-BIOS
Date
:
6/13/90
Parallel
Port(s)
:
3BC
A-4
INSTALLING
COMPONENTS
Illustration
are
given
below.
80287
Notch
~:OOODDDDDDDDDDODDDDD
DDDDDDDDDDDDDDDDDDDC
80287
SOCKET
Check
whether
the
system
BIOS
can
detect
the
coprocessor
upon
power
up.
The
system
BIOS
will
display
a
list
of
devices
on
the
motherboard
after
self-test.
If
the
coprocessor
is
installed,
it
should
show
the
type
of
coprocessor.
3-3
SYSTEM
BIOS
If
it
is
the
first
time
that
the
computer
is
started
up,
you
will
need
to
configure
the
system
by
telling
the
SETUP
program
what
hardware
configuration
your
system
contains.
The
SETUP
is
a
program
that
resides
in
the
BIOS
and
is
called
up
every
time
the
system
boots
up.
It
lets
you
specify
your
system's
configuration
of
diskette
drives,
hard
disk
drives,
video
display,
memory,
date
and
time.
The
AMI
BIOS
SETUP
provides
a
one-screen
interactive
equipment
and
machine
configuration
setup.
It
can
be
run
after
the
system
has
been
turned
on
and
the
memory
test
is
finished
or
has
been
escaped.
The
SETUP
program
is
built-in,
you
do
not
need
a
diskette
to
use
it.
If
your
FOX-III
is
already
installed
in
a
working
system,
you
will
not
need
to
use
the
SETUP
program
unless
the
configuration
already
recorded
in
the
on-board
CMOS
RAM
is
lost
or
a
change
is
made
in
your
system
hardware
configuration.
If
the
information
is
lost
due
to
loss
of
battery
power,
you
will
need
to
reenter
the
configuration.
A-2
INSTALLING
COMPONENTS
SYSTEM
MEMORY
CONFIGURATION
FOX-III
offers
a
flexible
memory
configuration.
There
are
2
memory
banks
available,
these
memory
banks
are
referenced
as
BANK
0
and
BANK
1
in
the
motherboa
rd.
(See
Appendix
C
for
the
motherboard
layout)
User
has
the
option
of
either
using
DIP
type
DRAM
or
SIMM
type
memory
modules.
Still
if
the
user
prefers,
he
could
use
both
types
together.
That
means
you
could
use
DIP
and
SIMM
type
memory
at
the
same
time.
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
SIMM
socket
referenced
as
'BANK
0'.
One
bank
of
memory
refers
to
as
2
SIMMs
mod
ules
or
6
DIP
memory
chips
(4x44256
+
2x41256
).
For
the
SIMM
memory,
user
can
insta
11
256K
and/or
1M
SIMM;
therefore
it
has
a
maximum
memory
capacity
of
4
Megabytes.
On
the
other
hand;
if
purely
DIP
DRAM
are
used,
it
will
allow
up
to
1
Megabytes
of
memory.
The
DIP
DRAM
are
organized
in
2
banks
as
shown
below:
3-5
TECHNICAL
INFORMATION
I/O
Channel
(D-Side)
I/O
Pin
Signal
Name
I/O
01
-MEM
CS16
I
02
-I/O
CS16
I
03
IRQ10
I
04
IRQll
I
OS
IRQ12
I
06
IRQ1S
I
07
IRQ14
I
08
-OACKO
0
09
ORQO
I
010
-OACKS
0
Oll
ORQS
I
012
-DACK6
0
D13
DRQ6
I
014
-DACK7
0
01S
DRQ7
I
D16
+S
Vdc
Power
017
-MASTER
I
018
GND
Ground
4-18
INST
ALLING
COMPONENTS
The
different
configurations
of
memory
is
illustrated
on
the
following
table.
It
shows
the
memory
configuration
available
for
each
possible
memory
map.
Memory
Configuration
I
Bank
0 I
Bank
1 I
Total
Memory
I
256K
---
512K
256K
256K
1M
*
256K
1M
2.5M
1M -
--
2M
1M
1M
4M
This
is
a
special
case
where
memory
relocation
is
available,
the
384K
of
memory
'between
640K
and
1M
can
be
remapped
between
1M
and
1.384M
as
extended
memory
or
'can
be
used
for
EMS
and
Shadow
RAM
simultaneously.
3-7
TECHNICAL
INFORMATION
INSTALLING
COMPONENTS
I/O
Channel
(B-Side)
I
I/O
Pin
I
Signal
Name
I
I/O
I
SMl
SM2 SM3 SM4
Bl
GND
Ground
B2
RESET
DRV
I
B3
+5
V.de
Power
B4
IRQ9
I
B5
-5
Vde
Power
B6
DRQ2
I
B7
-12
Vde
Power
B8
OWS I
B9
+12
Vde
Power
BI0
GND
Ground
Bll
-SMEMW
0
B12
-SMEMR
0
B13
-lOW
I/O
B14
-lOR
I/O
B15
-DACK3
I
B16
DRQ3
0
B17
-DACKI
I
B18
DRQl
0
B19
-Refresh
I/O
B20
CLK
0
B21
IRQ7
I
B22
IRQ6
I
B23
IRQ5
I
B24
IRQ4
I "
B25
IRQ3
I BANK 0 BANK 1
B26
-DACK2
0
B27
TIC
0
B28
BALE
0
B29
+5
Vde
Power
RAM
Module
Orientation
B30
OSC
0
B31
GND
Ground
4-16
3-9
TECHNICAL
INFORMATION
The
following
figure
shows
the
pin
numbering
for
I/O
channel
connectors
JB2,JB3,JB4
&
JBS.
REAR
PANEL
01
C1
010
C10
018
C18
COMPONENT
SIDE
4-14
INSTALLING
COMPONENTS
SYSTEM
BOARD
JUMPER
SETTING
There
are
several
jumpers
1n
the
motherboard
that
allow
the
user
to
select
the
desired
system
configuration.
The
following
tables
show
the
function
and
default
settings
of
these
jumpers.
ROM
Size
JPl
U
ROM
Size
1-2
II
27256
*
2-3
27128
Display
Selection
I
JP2
I
1-2
Monochrome
disp
la
y *
2-3
eGA,
EGA
or
VGA
Note;
*
factory
setting
3-11
TECHNICAL
INFORMATION
SYSTEM
EXPANSION
BUS
FOX-III
provides
six
expansion
slots,
four
of
which
are
16-bit
and
two
are
8-bit
expansion
slot.
The
1/0
channel
supports:
*
1/0
address
space
from
hex
100
to
hex
3FF
*
Selection
of
data
access
(either
8
or
16
bit)
* 24
bit
memory
ad
dresses
(16MB)
*
Interrupts
*
DMA
channels
*
Memory
refresh
signal
4-12
INSTALLING
COMPONENTS
P 2 -
Speaker
Connector
I
Pin
I
Assignment
I
Data
out
2 +5
Vdc
3
Ground
4 +5
Vdc
P 3 -
Power
LED
&
Ext-Lock
Connector
I
Pin
I
Assign
men
t
I +5
Vdc
2
Key
3
Ground
4
Keyboard
inhibit
5
Ground
P 4 -
Turbo
Switch
Conllector
Pin
Assignment
I
Selection
Pin
2
Ground
3-13
TECHNICAL
INFORMATION
CMOS
RAM
ADDRESS
MAP
I
..
4-10
Addresses
I
Description
OO-OD
*
Real-time
clock
information
OE
*
Diagnostic
status
byte
OF
*
Shutdown
status
byte
10
Diskette
drive
type
byte
-
drives
A
and
B
11
Reserved
12
Fixed
disk
type
byte
-
drives
C
and
D
13
Reserved
14
Equipment
byte
15
Low
base
memory
byte
16
High
base
memory
byte
17
Low
expansion
memory
byte
18
High
expansion
memory
byte
19-2D
Reserved
2E-2F
2-byte
CMOS
checksum
30 *
Low
expansion
memory
byte
31
*
High
expansion
memory
byte
32 *
Date
century
byte
33 *
Information
flags
(set
during
power
on)
34-3F
Reserved
These
bytes
are
not
included
in
the
checksum
calculation
and
are
not
part
of
the
configuration
record.
INSTALLING COMPONENTS
P 8 -
External
Battery
Connector
I
Pin
I
Assignment
1 +
Vdc
2
not
used
3
Ground
4
Ground
KB
1 -
Keyboard
Connector
I
Pin
I
Assign
men
t
I
Keyboard
clock
2
Keyboard
data
3
Spare
4
Ground
5 +5
Vdc
3-15
TECHNICAL INFORMATION
The
following
shows
the
addresses
for
the
page
register.
I
Page
Register
I
I/O
Address
(HEX)
DMA
Channel
0
0087
DMA
Channel
I
0083
DMA
Channel
2
0081
DMA
Channel
3
0082
DMA
Channel
S
008B
DMA
Channel
6
0089
DMA
Channel
7
008A
Refresh
008F
4-8
CHAPTER
4
TECHNICAL
INFORMATION
This
section
provides
technical
information
about
FOX-III
and
is
intended
for
advanced
users
interested
in
the
basic
design
and
operation
of
FOX-III.
MEMORY
MAPPING
Address
I
Range
II
Function
I
000000-
OOOK-SI2K
System
Board
Memory
7FFFFF
(SI2K)
080000-
S12K-640K
System
Board
Memory
09FFFF
(128K)
OAOOOO-
640K-768K
Display
Buffer
(l28K)
OBFFFF
OCOOOO-
768K-896K
Adaptor
ROM
/
ODFFFF
Shadow
RAM
(128K)
OEOOOO-
896K-960K
System
ROM
/
OEFFFF
Shadow
RAM
(64K)
OFOOOO-
960K-I024K
System
BIOS
ROM
/
OFFFFF
Shadow
RAM
(64K)
100000-
1024K-4096K
System
Memory
3FFFFF
400000-
4096K-16318K
I/O
Channel
Memory
FFFFFF
4-1
TECHNICAL
INFORMATION
SYSTEM
INTERRUPTS
Sixteen
levels
of
system
interrupts
are
prov
ided
on
FOX-III.
The
following
shows
the
interrupt-level
assignments
in
decreasing
priority.
Level
Microprocessor
NMI
In
terrupt
Con
trollers
CTLR
1
IRQO
IRQl
IRQ2
-
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
4-6
CTLR
2
r-
IRQS
IRQ9
-
IRQIO
IRQII
IRQ12
IRQ13
IRQ14
IRQ15
'--
Function
Parity
or
I/O
Channel
Check
Timer
Output
0
Keyboard
(Output
Buffer
Full)
Interrupt
from
CTLR
2
Real-time
Clock
Interrupt
Software
Redirected
to
INT
OAH
(IRQ2)
Reserved
Reserved
Reserved
Coprocessor
Fixed
Disk
Controller
Reserved
Serial
Port
2
Serial
Port
I
Parallel
Port
2
Diskette
Controller
Parallel
Port
1
TECHNICALINFORMATION
I/O
address
hex
100
to
3FF
are
available
on
the
I/O
channel.
ADDRESS
DEVICE
(HEX)
IFO-IFS
Fixed
Disk
200-207
Game
I/O
278-27F
Parallel
Printer
Port
2
2FS-2FF
Serial
Port
2
300-31F
Prototype
Card
360-36F
Reserved
378-37F
Parallel
Printer
Port
I
3S0-3SF
SDLC,
bisynchronous
2
3AO-3AF
Bisynchronous
I
3BO-3BF
Monochrome
Display
and
Printer
Adapter
3CO-3CF
Reserved
3DO-3DF
Color
Graphics
Monitor
Adapter
3FO-3F7
Diskette
Controller
3FS-3FF
Serial
Port
I
4-3
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