Casio BF-100 User manual

_
ELECTRONIC
CALCULATOR
CALCULADORA
ELECTRONICA
OPERATION MANUAL
MANUAL
DE
OPERACION
O062E SA #® Printed in Japan

Thank
you
very
much
for
purchasing
our
electronic
calculator
with
6
built-in
financial
calculation
functions.
This
instruction
manual
explains
the
fundamental
methods
for
the
use
and
handling
of
the
calculator.
Please
read
it
carefully
so
that
you
may
fully
understand
all
of
the
various
functions.
| Please notify us of any errors or omissions you find in this manual. We
cannot
be
responsible
for
damage
or
loss
resulting
from
the
information
contained herein, use of calculation examples, misprints or omissions.
rn
CONTENTS
T/INOMENCLATURE
2...
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2
Z2/POINTS
OF
CAUTION
2...
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tenet
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10
3/IBATTERY
MAINTENANCE
...
1...
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eee
teen
tenes
10
4/BEFORE
USING
THE
CALCULATOR
........
eee
eee
ete
tenes
11
5B/BASIC
CALCULATIONS
2...
cece
cee
ee
er
eee
te
eer
eee
eee
eens
13
Four
Basic
Calculations
0.0.0.
ne
ee
ee
13
Constant
GalewlatiGns:
20.8
we
4g
sh
aaa
he
Se,
ee
does
Babee
EE
Oe
Ra
ae
ale
Ser
13
Percentage
Calculations
0...
es
15
Memory
Calculations...
0.
ee
eae
on
re
in
17
Dale
Cateulitions:
64.44
sn
ae
ee
a
ee
a
ee
ee
ee
ee
ie
aoe
a
pet
18
Farner:
Calculations:
6
soe.04
bec
head
alee
ba
ee
a
OS
Re
ee
aie
He
ob
ea
ee
OR
21
G/FINANCIAL
CALCULATIONS
2.0...
6.
cee
ee
eee
ee
eee
eee
ees
23
Compound
Interest
Calculations
.........-.--0.
SSE
LR
os
Oe
disses
U
ita
cia
Ieee
24
Coan
Caleulations
fentcdie
ss
£
oe
acne
bia
ee
ek
SR
Eee
a
ges
by
Ge
Bose
as
30
Annual
Payments
2.0.00
0000
0c
ce
ee
eee
ee
eee
bee
DE
eee
nee
es
36
Bonus
Payments.
o.oo
ee
lead
hep
dae
ae
ee
eb
etek
ee
De
de
Re
ae
39
fistallmentSavinigs:
.a.h.fa
beetle
ead
Ge
SEES
ea
a
He
eae
eats
haha
baal
RS
42
Deferred
Annuity
Present
Values
205.
ee
ee
49
7/APPLICATIONS
......
Sie
atieree
se
ase
kus
euaks
eres
he
eer
er:
51
B/SPECIFICATIONS
1...
0...
cee
eee
ee
tee
eee
eee
teeta
58
pore 1 -.
et

i. 3 ewe
1/NOMENCLATURE
”
eee
en
eee
(1)
Power
switch
aan:
Move
the
slide
switch
to
the
right
to
turn
the
power
ON.
The
independent
memory
and
Made
designation
for
financial
calculation
will
be
retained
even
after
the
power
is
turned
OFF.
(2) Display
ENTINV
EXET
INT
LOAN
SF
AMORT
BNS
(ry
ama
M
Im
muUecc
moc
Le
K
(EL
ltt
CE
at,
(iss
(314)(24)————__
(25)(26)(27)
The
display
shows
input
data,
intermediate
results
and
results
of
operation,
(18)(19)(20)—---.._]
fe
(211221123)
A
date
is
displayed
as
follows:
(14)(13)(12)
oe
“—"
will
not
be
lit
from
the
year
2000
to
2099.
[Indicating
May.
29
(Fri.),
1981.)
on ae
Year
Month
Date
Day*
esac
i
ae
1
i
ae
ee
4
;
Sun.
Mon.
Tue,
Wed.
Thu.
[esa
Fri, | Sai.
-3-

“E™ (error check, see page 12) may be displayed in the position of the least digit
In
financial
calculations,
"INT",
“LOAN”,
“SF,
“AMORT",
“BNS",
“GEM
ange
“fm will be displayed to indicate the operating mode, “ENT/INV’ to indicate «.
condition available for data input, and "py" to indicate the condition available for recs:
output,
“M" will be displayed when data is stored in the independent memory.
“KO will be displayed during calculation with constants.
ENT INV
(3) Entry/Inverse key
e
When
entering
data,
press
this
key
just
prior
to
pressing
each
key.(Symbolized
here
as
&
}
e@
When
activating
the
functions
printed
in
orange
on
the
keyboard,
press
this
key
just
prias
to pressing each key. (Symbolized here as {w))
ANS
(4) Answer key (Symbolized here as @3 )
For
financial
calculations,
to
find
the
answer,
press
this
key
just
prior
to
pressing
each
key
(5) al Mode key (Symbolized here as )
@
Press
this
key
to
choose
the
proper
mode
for
financial
calculations
(INT,
LOAN,
St.
AMORT,
BNS).
When
this
key
is
pressed,
the
mode
will
change
in
sequence
from
INT
to
LOAN
to
SF
to
AMORT
to
BNS
to
INT.
Selected
mode
will
be
displayed
when
the
key
os
pressed.
.
@
if
(oe)
key
is
pressed
following
the
key,
Beginning
of
Period
Payment
(
Ba)
or
End
of
Period
Payment
(
GB
)
will
be
selected
and
displayed.
" Any mode may be used when performing basic calculations,
-4-
(6) (0) —(S), (-) Numeral and decimal point keys
To enter numerals, press these keys.
For decimal places, press the G) key in its logical sequence.
(7) €3, &8, £9. Gi. Four basic calculation and equal keys
When performing four basic calculations, press these keys. The Ei key obtains an answer.
* Constant calculations will be performed by pressing each key (E93. GY. E39 or H}) twice
successively. (See page 13.)
(8) Percent key
When performing percentage calculations, press this key.
(9) Sign change key
When changing the sign of displayed number from plus to minus and vice versa, press this
key. :
on FX : . ,
(10) “et? All clear/Financial calculation clear key
@ Press this key to clear all data except independent memory and financial calculating value.
Also press for display when display is blank as a result of the Auto Power Off Function
(Automatic Power Saving Function. .... see page 12).
e For financial calculation, prior to beginning to calculate, press @) G to clear total value
memory.

(11) (@ Clear key
When
clearing
entry
for
correction,
press
this
key.
M+
(12)
Memory
plus
key
(Symbolized
here
as
3)
Press
this
key
when
adding
displayed
number
to
the
contents
of
the
independent
memory,
It
has
the
same
function
as
that
of
the
EJ
key;
it
obtains
an
answer
in
four
basic
calculations
and
automatically
add
the
answer
to
the
contents
of
the
memory.
Mow
(13)
@
Memory
minus
key
(Symbolized
here
as
©)
Press
this
key
when
subtracting
displayed
number
from
the
contents
of
the
independent
memory.
It
obtains
an
answer
in
four
basic
calculations
and
automatically
subtracts
the
answer
from
the
contents
of
the
memory.
(14)
Ee
Memory
recall
key
(Symbolized
here
as
a)
)
Press
this
key
when
recalling
the
contents
of
the
independent
memory
without
clearing.
Min
.
(15)
@
Memory
entry
key
(Symbolized
here
as
(3
)
.
Press
this
key
when
stering
displayed
number
to
the
independent
memory.
Old
data
held
in
the
memory
will
be
automatically
cleared.
;
-6-
PRN
(16)
ss
Principal/Number
of
days
key
®
To
calculate
the
principal
portion
of
an
amortized
loan,
press
this
key
following
the
(#3)
key.
This
key
will
only
be
used
to
calculate
equal
periodic
payments
in
the
AMORT
mode.
(Symbolized
here
as
fj)
,
@
When
inputting
the
number
of
days
from
the
date
of
loan
lo
the
date
of
the
first
payment,
press
this
key
following
the
fj
key.
This
key
will
only
be
used
to
perform
bonus
payment
in
the
BNS
mode.
(Symbolized
here
as
(d))
BALIN
(17)
§&
Balance/Number
of
months
key
®
To
find
the
remaining
blance,
press
this
key
following
the
@g
key.
(Symbolized
here
as
a)
)
*
When
inputting
the
number
of
months
from
the
month
of
loan
to
the
first
bonus
payment
month,
press
this
key
following
the
fi)
key.
This
key
will
only
be
used
to
perform
bonus
payment
in
the
BNS
mode.
(Symbolized
here
as
(n))
INT
(18) gM Interest key
When
inputting
interest,
press
this
Key
following
(a4),
To
find
interest,
press
following
fs}.
(Symbolized
here
as
(7)
)
n
(19)
§
Number
of
periods
key
ie
When
inputting
number
of
periods.
press
this
key
following
fq.
To
find
number
of
periods,
press
following
@.
(Symbolized
here
as
()})
fo awe

Pobre eh re ot
i %
(20)
gg
Interest
rate
key
When
inputting
interest
rate,
press
this
key
following
fi).
To
find
interest
rate,
press
following
a).
(Symbolized
here
as
(i)
)
PMT
(21)
g@
Payment
key
When
inputting
monthly
payment
amount,
press
this
key
following
fy)
.
To
find
monthly
payment
amount,
press
following
&.
When
using
this
key,
the
number
of
periods,
interest
rate,
etc.
must
be
on
a
monthly
basis.
(Sy
mbolized
here
as
fu)
PY
(22)
gm
Present
value
key
When
inputting
original
amount,
present
value
or
amount
borrowed,
press
this
key
following
eMT
To
find
original
amount,
present
value
or
amount
borrowed,
press
following
&§
.
(Symbolized
here
as
Fv)
}
FV BNS
(23)
gg
Future
value/Bonus
key
®
When
inputting
future
value
(total
future
value
of
principal
plus
interest},
press
this
key
following fy).
To
find
future
value,
press
following
fg.
(Symbolized
here
as
fy)
e
When
inputting
bonus
payment,
press
this
key
following
&.
This
key
will
only
be
used
to
perform
bonus
payment
in
the
BNS
mode.
(Symbolized
here
as
&3)
-§-
DATE
(24)
gg
Date
key
,
When
performing
number
of
days
calculation,
press
this
key
after
inputting
numbers
for
year,
month
and
date.
(Symbolized
here
as
ait)
)
r
(25)
gg
Square
root
key
.
To
calculate
the
square
root
of
displayed
number,
press
this
key.
(Symbolized
here
as
(7)
log 7
(26)
Common
logarithm
key
To
find
the
common
logarithm
of
displayed
number,
press
this
key.
(Symbolized
here
as
(cg)
xr”
(27)
ge
Power
raising
key
To
raise
the
base
x
to
yth
power.
(Symbolized
here
as
&)
we reins e eamuanpeeee”
2 ge Ree

PRAM ain td aM Pn te FORA nek ea td a LE RN cde a ane erate tree A CR EE uate RO TR te ut Rae denied oe
2/POINTS
OF
CAUTION
*
Since
the
unit
contains
precise
electronic
components,
never
attempt
to
disassemble
it.
For
servicing
contact
your
retailer
or
a
nearby
dealer.
*
Be
careful
not
to
drop
the
unit
or
handle
it
roughly.
Avoid
operating
the
keys
roughly.
:
F :
*
Avoid
using
the
unit
in
extreme
temperatures
(below
32
F
or
O°C,
or
above
104°F
or
°
i
Ex
{
2
humid
conditions.
40’C).
Also
protect
the
unit
from
extremely
dusty
or
;
“To
clean
the
unit,
use
a
soft,
dry
cloth
or
slightly
damp
cloth
with
neutral
detergent
to
wipe
it
off.
Never
use
thinner,
benzine
type
solvents
or
alcohol
for
cleaning.
3/BATTERY
MAINTENANCE
r
decreases,
the
whole
display
darkens.
Battery
should
then
be
renewed
t
patter
owe
3)
:
pee
oka
the
power
before
changing.
For
battery
specifications,
see
page
57.
Be
sure
to
switch
OFF
Replacement
of
battery:
1)
tide
open
the
battery
compartment
lid
on
the
back
of
the
unit.
2}
Remove
dead
battery
and
insert
new
battery
with
the
plus
terminal
(flat
side)
on
top.
a
~10-
3) Replace the battery compartment tid.
* Before inserting new battery, be sure to thoroughly wipe it off with a dry cloth to
maintain good contacts.
* Never leave dead battery in the battery compartment.
* Remove battery when not using for an extended period.
* It is recommended that battery be replaced every 2 years to prevent the chance of
malfunctions due to battery leakage. ,
Note: For initial operation after battery replacement, turn the power switch on and off
twice (i.e. ON-OFF-ON).
4/BEFORE USING THE CALCULATOR
™ Correction .
* If you are aware of data entry error before pressing a command key, oress (@ and re-input
the correct data.
. if you have pressed 3, f2, €or by mistake, you may press the correct key
immediately.
-y1-
io See

® Overflow or error check
Overflow
or
error
is
indicated
by
the
“E'
sign
and
stops
further
calculations.
Overflow or error occurs:
1)
When
the
integer
part
of
an
answer,
whether
intermediate
or
final,
exceeds
10
digits.
However,
the
significant
10
digits
of
the
answer
are
given
and
the
decimal
point
indicates
that
the
true
decimal
position
is
10
digits
to
the
right.
2)
When
the
integer
part
of
an
accumulated
total
in
the
memory
exceeds
10
digits.
3)
When
a
number
is
divided
by
O
(zero).
4)
When
function
calculation
or
financial
calculation
is
per
the input range (see page 54 to 56).
To
release
the
overflow
or
error
check,
press
the
f
or
(
key:
G
for
starting
a
new
calculation,
and
@
for
continuing
the
calculation,
which
clears
only
the
E”’
sign.
formed
with
a
number
exceeding
™ Auto power off function
if
the
calculator
is
left
with
the
power
switch
at
the
ON
position,
the
auto
power
off
function
automatically
turns
off
the
power
in
approximately
6
minutes,
thus
saving
battery
life.
Power
is
resumed
either
ty
pressing
the
G
key
or
by
re-operating
the
ON-OFF
switch.
~12—-
5/BASIC CALCULATIONS
5-1 Four Basic Calculations
EXAMPLE
OPERATION
READ-OUT
534123-63=113
5381238638
113.
0.456x(-89)+12=—-3.382 J456889H0126 “3.302
(56x3-89)+5.2+63
=7B.19230169aee.
5603089050)20638
_78.19230769
5-2 Constant Calculations
EXAMPLE
OPERATION
READ-OUT
3+2.3=5.3
2(J
30038
6+2.3=8.3
68
Se 13 -
i. See

EXAMPLE
OPERATION
READ-OUT
7-5.6=1.4
567
|
1.4
-4.5-5.6=
-10.1
40)5@8
2.3x12=27.6
12802038
(-9)x12=-108
96
|x
—
108.
74=2.5=29.6
20/5674
|
85.2=2.5=34.08
17+17+17+17=68
1.77=2.89
1.77=4.913
1.7°=8.3521
85028
|x
1708
=
a
oO
x
00
16)
oO
NO
—_
-14-
Ww
BIN
ore
|
ae
q7 0:25
Me
2
mn
=0.0625
5-3
Percentage
Calculations
EXAMPLE
£9040
1500
2<.ae
sees
Se
hee
180
Percentage
of
660
against
880....--
75%
15%
add-on
of
2500
...----+00
00:
2875
25008315t)ma
|
2875.
|
,;
apeie[,
0-25)
Bik
0.0625
OPERATION
READ-OUT
150089128
scomesom
[7]
25%
discount
of
3500
...--
+++
0+"
2625
3500825%)
&
|
2625.
|
If
you
made
$80
last
week
and
$100
this
week,
what
ts
the
percent
increase?
..----
—-15-
roomeoss
[25]
(%)
fs Nee

EXAMPLE
12%
of
1200
..
6.
.
eee
eee
144
18%
of
1200.0...
eee
ee
eet
216
23%
of
1200...
eee
eee
tts
276
Mark-up
What
will
the
selling
price
and
profit
be
when
the
purchasing
price
of
an
item
$480
and
the
profit
rate
to
the
selling
price
is
25%?
,
Mark-down
What
will
the
bargain
price
and
loss
be
ifa
$130
item
is
sold
at
a
loss
rate
of
4%
of
the
bargain
price?
OPERATION
1200 96312 &)
18%)
23%)
480 325%)
(Subsequently) Ea
130N444)
(Subsequently) Gad
~16-
READ-OUT
(Selling price)
.
(Profit)
(Bargain
price)
(Loss)
+) 99+4= 24.75
5-4
Memory
Calculations
*
The
contents
of
the
memory
will
be
retained
even
after
the
power
is
turned
OFF.
*
When
a
new
number
is
entered
into
the
memory
by
f4
key,
the
previous
number
stored
is
automatically
cleared
and
the
new
number
is
put
in
the
memory.
*
To
clear
the
contents,
press
&
J
or
(@
mJ
in
sequence.
READ-OUT
EXAMPLE
OPERATION
53+6=
59
53068
23-8=
15
2388)
56x2=112
56E2m)
99 fi 4)
210.75
567-7
4123)
+
(2K3)+(2%3)—(2X3I=19
7M
2933eBeo
we
-17-
eye nT ere
ts Se wee