Bowmar MX80 User manual

INTRODUCTION
Your Bowmar MX80 Calculator represents a
significant engineering achievement resulting
in full-size capability in a pocket-size package.
Advances in miniaturized computer circuits
using single-chip LSI (Large Scale Integration),
LED (Light Emitting Diode) display technology,
and a unique snap-action keyboard have
provided a rugged, reliable unit, and the self-
contained nickel-cadmium rechargeable
batteries permit convenient use even when AC
power is not available.
The MX8Q performs addition, subtraction,
multiplication, division and percentage
including chain or mixed multiplication and
division. and utilization of a stored constant,
It also has a capability to mark up or discount
a number after the percentage is calculated.
Ten digits are provided for entry and readout
with afull floating decimal and a positive or
negative sign. Additional display indicators
denote Power On, Low Battery, Overflow, Error
and Minus Sign. A "Battery Saver" feature to
extend battery ope1ating time causes the
display to blank out approximately 30 seconds
after the last entry, without the loss of a
problem.
It is suggested that the following instructions
be read with the calculator at hand, and that all
examples be performed with the unit to
increase your familiarity. A short outline of
operating procedures is also printed on the
back of the calculator.
,
•
OPERATION
AC Operation:
Set the switch on the back of the Charger/
Power Supply to the electrical outlet
voltage, Le., 115 or 230 Volts. Plug the
Charger into the outlet and the connector
into the Calculator. (Note that the
connector is keyed.) After these
connections, the power switch may be
turned on and operation started.
Battery Operation:
Disconnect the Charger cord and turn the
power switch "ON". With normal use afull
battery charge can be expected to supply
about 5 hours of working time.
NOTE: When the low battery indicator
(L) on the display is lighted, do not
continue battery operation. This
indicates need for a battery charge.
Use of Ihe Calculator can be continued
during the charge cycle. Charging will
continue whether calculator is on or off.
Battery Charging:
Simply follow the same procedure as in AC
operation. The Calculator may be used
during the charge period if desired. In
order to fUlly charge a battery which has
been completely discharged, 7 hours is
required. In most cases, an overnight
charge should be adequate.
NOTE: Although no damage will result
from prolonged periods with the Charger
connected, il is advisable to remove the
Charger when it is not in use or after
a fu!1 recharge cycle.
CAUTION: To avoid possible damage, use
only the charger provided with the calculator.
•

CONTROLS & INDICATORS
2. 'K' Switch
Adds a minus sign to an
entry, Subtracts the
entered number or
completes a prevlOusly
entered "multiply" or
"divide" command.
Slide sWItch with 2
positions; in the up
position, the 'K' operation
is in effect. Use of 'K'
allows a number to be
entered and retained as a
"constant" for series
multiplication or division .
Performs %, mark~up, and
discount operallon.
Clears the Calculator and
the display of all numbers.
Clears the display of the
previous keyboard entry,
Enters a "multiply"
command.
Enters a "divide" command.
Adds the entered number,
or carries out a previously
entered "multiply" or
"divide" command.
Turns Calculator "ON" &
"OFF".
Key
Key
Key
Key
Key
Key
1. "ON" Switch
9. == Key
•
13.
1.
•3. m
4.
4. a
5.
5.
ri
9.
7.
6.
13
7.
a
6.
8.
all
8.
12.
10.
11.
3.
2.
• __ __ _ -..,. ' 2. ./
~ '- L

F. Finally, touch the :I key for answer
Display will be:
Note: Use m during, or immediately
after entry of anumber.
C. Then you enter 13 by mistake
The display is:
E. Then enter '12'
Display wi\! be",
Amistake!
D. To clear 13, touch the II.key
Display
will be:
•
PRELIMINARY
INSTRUCTIONS
2. To enter (write a number)
Example: enter 123.45
A. First, clear by touchingll
B. Then touch number and decimal keys
for 123.45 one at atime. Always start
with the left hand digit and progress
from left to right.
Display will then be:
1. To clear (erase)
A. Touch thell Key
B. Cleared display will be:
123.45
3. To clear an incorrect entry
Example: 48·+- 12 is your calculation
A. You have already entered 48
Display is;
B. You now touch the == key
Display will be:
-
•
OJ( 151
; 1 1-1 , , t. :.
",J "til';,
Mit ,¢
Ii.

CALCULATIONS
1. ADDITION
Example ff1: To calculate 16.39 +9.83 =
Do these steps display will be
2. SUBTRACTION
Example #1: To calculate 12.81 -- 3.6:.=
Do these steps display will be
a.
Touch II
b
Enter 16.39
c. Touch =:
d.
Enter 9.83
e. Touch =: Answer
16.39
16.39
9.83
,26.22
a.
ToUChll
,b.
Enter 12.81
c.
Touchll
•d. Enter
3.6
e. Touch=
Answer
12.81
12.81
9.21
19.1
14.1
Example #2: To calculate 23"~ 6+ 2.1 - 5 =
Do these steps display will be
a.
TouchB
b. Enter 23
c.
TouCh=:
d. Enter 6
e.
Touch=
f
Enter 2.1
•g.
Touch II
h
Enter 5
i.
TouCh=
Answer
37.4
33.3
c. Touch =
d. Enter 9
Example #2:
To calculate 16 --I- 9+8.3 + 4.1 :.=
Do these steps display will be
a, TOUChl!
b. Enter 16
e. Touch ==
1
Enter 8.3
g.
Touch =
h
Enter4,7
I TouchCl
Answer
•
Lit

384.3
,6.1
Example #2: To calculate 3 x 21 x 6.1·
Do these steps display will be
Example #3: To calculate 31 x 6
Use of 'K' Switch 31 x8.2 :=
31 x7.6=
Do these steps display will be
a.
Touch II
b.
Enter 3
,c.
Touch EI
I
1d.
Enter 21
Touch EI
e.
f.
Enter 6.1
g.
Touch ==
Answer
. 10.
- 20.
~ 10.
.- 50. Answer
f. Enter 10
c, Touch=:;
d. Enter 82
e. Touch II
Example #3:
To calculate 62 -82 +10 -40-=:
Do these steps display will be
8. Touch II
b. Enter 62
g. TouChl:l"
h. Enter 40
I. Touch ==
186.
31.
a.
Touch II
b.
Push 'K' on (up)
fc
Enter 31
t
d.
Touch 13
Enter 6
e
I.
Touch 1:1
1st Answer
g.
Enter 8.2
29.32
56.5
29.32
16[,6.58
Answer
3. MULTIPLICATION
Example #1: To calculate 29.32 x 56.5::..::
Do these steps display will be
a. Touch II
e. Touch 1:1"
b. Enter 29.32
c. Touch EI
dEnter 565
'*

h Touch 1:1 2nd Answer
Enter 7.6
254.2 e. Touch a
f. Enter f:J
.. '
j, Touch II 3rd Answer
235.6 g.
Touch:l Answer
181.
181.
117.
,6.4
12.06666666
e. Enter 15
c. Enter 181
d. Touch a
a. Touch II
f. Touch =:I
1st Answer
9
Enter 96
h Touch II 2nd Answer
,
Enter11?
b. Push 'K' on (up)
Example #3: To calculate 181 -;-. 15 =
Use of 'K' switch 96 -;. 15 =
117715=
Do these steps display will be
J. Touch II 3rd Answer
•
376.
376.
,7.094339622
,53.
k. Push 'K' off (down)
c. Touch a
d. Enter 53
4. DIVISION
Example #1: To calculate 376 53 ~,~
Do these steps display will be
a. Touch II.
b. Enter 376
e, Touch =- Answer
Example ·#2: To calculate 81 ---:- 3-:-- 9 -
00 these steps display will be
a, Touch II
b. Enter 81
c, Touch a
d, Enter 3
k. Push 'K' olf (down)
,

5. PERCENTAGE
Example :;'1: To calculate 5% of 375
Do these steps display will be
Example ,13: 10% discount, 5% sales tax
on an item at $250.
Do these steps display will be
a.
TOUChS
b.
Enter 5
c.
TouChm
d.
Touch EI
e. Enter 375
f.
Touch =
Answer
0.05
0.05
375.
18.75
a. Enter 250
b.
Touch 13
c. Enter 10
•d.
TouChm
e.
Touch == Value After
•100j<,Olscoun
f.
Touch EI
g.
Enter 5
250.
250.
225.
225.
Example ;;,2: Markup after adding 3% sales
tax on an item of $16.00
Do these steps display will be
h, Touch m
I. Touch DlFinal Amount
to be Paid
11.25
236.25
a, Enter 16
b. TouchEi
.16.
Example ;;'4: What % is 75 of 125?
Do these steps display will be
C. Enter 3
8. Touch a!Final Amount
0.48
16.48
a.
Enter 75
Touch a
'C'
b.
~
~
c. Enter 125
d. Touch
em
Answer
75 ..
125.

g.
Touch=
hTouch
13
,
Enter 8
J.
TouchD
. -_. -
•
k.
Enter 20
I.
Touch II
m
Enter 8
n
Touch =
Answer
15.33333333
-92.
-92.
Example ;3: 5% of (5 + 16 + 17) xa
Answer Do these steps display will be
(9 +6 - 5) x8
_. ....- 8"
20
b.
Enter 23
c.
Touch EI
d.
Enter 4
eTouch II
f.
Touch a
9
Enter 6
h. Touch
;;
Example #2:
To calculate
6. MIXED ARITHMETIC
Example #1: To calculate 23 x (--4) --:- (---6) =---
00 these steps display will be
a. Touch II
Do these steps
a, Touch II
display will be
b. Enter 9
c. Touch II
,38.
d. Enter 6
e, Touch =
f. Enter 5304.
.,. . 1: La;
•

J. Touch EI
k. Enter 5
I. Touch m
Answer
For example, multiplication of two
positive numbers
12345678 X 345678
will give the following display
r426.7629279
will give the tollowlng display
or mUltiplication of a positive and a
negative number
7. EXPONENTS
Example;;1: To calculate (3)5 -
Do these steps display will be
12345678' 345678
9. TO RECALL THE DISPLAY
AFTER 'BLANKING'
During battery operation, the display will
automallcally turn off, il there is no keyboard
activity for about 30 seconds. This feature
is provided to conserve the battery power.
Depress any key on the keyboard to reeaU
the 'blanked' display.
c426.7629279
The ",'. "or "::.: ,. symbol jndicates positive
or negative "overflow" respectlvely, and
indicates an answer of more than 10 digits
shown. To obtain the correct decimal
location lor either case, simply record the
displayed number and move the decimal
point 10 places to the right. The real answer
will then be:
+4.267,629,279,000.
~C 10 places ~
This procedure applies to all operations;
multiplication, division, addition,
subtraction and per-centage. Use the 'C'
key to clear the overflow.
8. OVERFLOW INTERPRETATION
The positive or negative overHow indicator
indicated by" or:= respectively, will
appear W~len the display capacity of the
calculator is exceeded.
a. Touch e
bPush
'K'
on (uP)
c
Enter 3
d. Touch EI
e. Touch
1:11
I. Touch ail
g.
Touch =-
h.
Touch ==
Answer
I.
Push 'K' off (down)
" .. _-----------_ ...... -----------------
b ... :'1:; • l¢ (£4, 'lOP •

BAlTERY NOTES
1. With normal USB at room temperature, a fuB
battery charge can be expected to supply about
5hours of accumulated working time,
2. The Calculator may be used while 'Its battery IS
charging.
3. Batteries thathave been neither used nor charged
for as long as 2 or 3 months will sutler substantial
loss
of operating time through atendency to
self-discharge. As agenera! rule, batteries lose
about '1"/0 charge per day due 10 sel f-dIscharge.
at normal temperatures
4For optimum perforrnance and long life
a. Alternate treqlJently between Battery and
AC power
b. Operate at or near normal room temperatures.
c, Charge as soon 85 possible upon appearance
of the Low~Battery indicator.
5. Recharge time is 7 hours for afully discharged
battery.
6The Low-Battery indicator is designetl to appear
as soon as batteryvoltage drops to the lowest
value that will support optImum performance of
theCalculator. Should further discharge occur,
through continued operations or self-discharge,
the
Low-sattery indicator may fail to appear.
00 not continue 1:0 operate on baHeries when
this condition is noted. or a damaged battery
may result.
7, As ageneral rule, if improper opera1\on occurs,
first tly the Calculator with its charger connected,
lf operation is then nonna!, thiS indicates the
baHeries are loW.
8. 00 not store the unit in high temperature areas
such as the top of radiators or the rear deck of
automobiles exposed to the sun. The Calculator
will operate satisfactonly over an ambient tem-
perature range of a to SOC (32 to 122F) and
relative numidlty to 95
%•
WARRANTY
80Wr1l,HALI, Inc, ' .... alrants 10 the purchas(~:, at
lhi~j flew ;30'Nnl,H Cidc;uliltor thdt j! trw IlIaC;llne
Dr ,my pan the-rDol \Il \he !udDment ,,: Bowillar
IS pl'OVen 10 D8 drciecttve In Iiiater:,li Dr work-
rnanshl.~) Within [JIW vei\l rro,,) (!ille of ~),-;qif'a!
purGh<l~;r", ~,;i;c-rl defects will be rep<JI:-<2d or
replaced ial thG Ci)mpall~'s opt,orl) treo 0'
ch'Hge :qr p,Hts 'H\f1 lHbol
lr-'\,; w;).lI'ani'f does !lo\ <>pply 10 ,lny pwc!l.IC'.
which has been claO'laged by accider.1 01 which
113s be~,f1 mjsu$ed, illnlsed, ililered, or repaired
by anyone other than 80wmar
Hlis warranty IS In lieu ot all other Wi3:'ranties
expressed or JlTlpiied, and no perSon :s Buthor-
ized 10 ",S3ume lor 80wmar any other liiJ.billty
in conner;llon Wil)' the saie of this prodUCt
To obtain repairs, the CalcuI;:IlOr should be
dBli\lered, pre-paid, \0 Bowm,:l!;"U. Inc. at
address shown belOW In"warranty units will
be tclurnt,d postage prepaid.
BOWMAR/AU, INC. ACTON. MASS. 01720
1\90) ·C~j7 Ij
Ii J.i H
it
.