Bowmar MX55 User manual

1. INTRODUCTION:
Your Bowmar Brain is light and small enough to be used in one hand but it
provides a standard keyboard and easily readable LED display, The floating
decimal
point provides accurate solution to any calculation.
Your Bowmar Brain has the ability to solve problems with features such as
clear entry, automatic squaring and an omni-constant that will perform integer
powers, reciprocals and fractions as well as chain and mixed calculations.
We suggest that this Instruction Manual be read with the calculator in hand.
Performing the
operations as you read them will increase your familiarity
with them.
2. CONTROLS AND INDICATORS: (See diagram on back page foldout)
1. Charger cord socket.
2. "ON" switch turns calculator "ON" and "OFF". I
3. II Key. Enters a "subtract" command and performs any possible pre-
ceding
operation.
4. •Key. Enters a "divide" command and performs any possible pre-
ceding operation.
5. EI Key. Enters a "multiply" command and performs any possible pre-
ceding operation.
6. aKey. Enters an "add" command and performs any possible pre-
ceding operation.
1

7. •Key. Enters a decimal point.
8. B-1] Keys. Enters digits of a number.
and conditions a discount or
Key. Completes a percent operation
mark up operatio!1.
Key. Completes previous operation.
9. m
10. I!l
11. m Key. Clear" the calculator and the display of all numbers or the
previous keyboard entry only_
12. ChCHger/Powcr supply.
Overflow Indicator: Indicates a calculation result with more than eight digits.
Appears as
Minus Sign Indicator: Indicates a negative number and Immeciiately precedes
a number.
Appears as
Low Battery Indicator: Warns of need for t,attery recharging during battery
operation:
Appears as
Decimal Point Indicator: Automatically appears to the right of any number
entered, unless inserted in another sequence by use of the decimal key. With
fractionai numbers. it will be preceded by a zero.

3. OPERATIONS:
For AC Operations: Connect the charger to an appropriate electrical outlet
as referenced on your Bowmar Charger. Plug the connector into the calculator
and turn the power switch on.
For Battery Operation: Disconnect the charger cord and turn the power switch
on. When Low Battery Indicator "L" appears on display, batteries need
charging.
Battery Charging: Simply follow the same procedure as in AC operation.
When connected to AC, the internal batteries are automatically charged
whether the power switch is "ON" or "OFF". The calculator may be used
during the charge period. 7 hours are required to fully charge completely
discharged batteries with calculator off.
Note: Although no damage will result from prolonged periods with the charger
connected. it is advisable to remove the charger cord when the calculator is
not in use
after a full recharge cycle.
Caution: To avoid possible damage, use only the charger provided with the
calculator.
3-1 BATTERY NOTES:
1. With
normal use, at room temperature, a full battery charge will provide
5hrs. of accumulated working time.
3
,

2. Recha.rgeable batteries will self discharge when not charged for 2 or 3
months.
3. For optimum performance and long life:
a. Alternate frequently between Battery and AC power.
b. Operate at or near norma) room temperatures.
c. Do not continue to operate on batteries when Low-Battery Indicator
appears or a damaged battery may result.
d. Charge as soon as possible upon appearance of the Low-Battery
Indicator.
4. Ii improper operation occurs, try the Calculator with its charger connected.
If operation is normal, the batteries need charging.
5. Do not store the Calculator in hlgh temperature areas such as the top 01
radiators or the rear deck of automobiles. The Calculator wiIJ operate
sat'lsfaclorlly over an ambient temperature range of 0° to SOcC (320to
122" F) and relative humidity to 95% ,
3-2 INSTRUCTiON:
1. To clear (erase) touch mKey twice. Dlsplay will read
2. To enter (write anumber), Example: Enter 123.45
Touch the number and decimal key for 123.45 one at a time (always start
with the left hand digit and progress from left to right). Display will read
123.45
4
:;;;;;;Jr;;.'.'.L,,;· -·;-;;;,;;;,;;;;;;;;;;;;;;;;;.;;;;;c...;;;-------------·,,-""'···· .. ---- .. ·= - _--, ,"'--- _., __ •
_~l __ l"
•

3. To clear an incorrect entry: Example: 48 +12 =
,.
Enter 48 Read
2. Touch aRead
3.
Enter 13 (Mistake) Read
4. Touch
~ Key once Read
5. Enter 12 Read
6.
Touch II Answer
Read
3-3 OVERFLOW INTERPRETATION:
The Overflow Indicator" L " will appear whenever an answer of more than
eight digits occurs,
E¥ample: 12,345,678 x345,678 =4,267,629,279,684. Will appear as
C42676.292
5
M4*tk td1!. a: t, .Pi itt
• Ji 4li"
; ,XLI
,1'-:'"
1. ,. t

For the actual answer, move decimal point eight places to the right of its
displayed position. So answer is 4,267,629,200,000.
"C8 places_j
Use mKey once to clear overflow condition.
6
, .t
". 'j
,L
Ill!'

THE BOWMAR BRAIN'S UNILANGUAGE INSTRUCTIONS,
~K
...
%
J
+
-
The Calculation Section uses symbols rather than words to show how to
calculate. The Symbols are as follows:
,j- Touch the keys in the sequence as they appear to the right of this
,- symbol.
The Calculator's display should appear as shown to the right of this
symbol.
MUltiplication Symbol
Divide Symbol
Addition Symbol
Subtraction Symbol
Used for decimal point
Symbol used to separate thousands's places
Omni-Constant Symbol
Percentage
x
,
7
- .. ·"'·r..I!IIII!lIII!lI ........... -------- ... - ... ------ ... -----· .... --- ... ---v
_,II!! n_u 't$tit $kJ 4 ;

1.
"+"
10 +5+3+2=20
L,
~~
2.
D
iii
3.
":"
a,
4.
II
5. xi a
6.
"
EI
,
7.
,,; a
.,
8.
/.,
Il
9.
.' :..
II
I
8
] It. k ad tt Jt $

2.
" "
-
15-5~10
1.
~~
,
2.
UBj
3.
'.
iii
4.
;, ;,
Bj
5.
II
,
3
"X"
•
3x2K6=36
1.
2.
3.
4.
.; ~
/' 11
'13
••
ifil
9
Ilb ... i1UJi .. .1l JUS .J
=,._. -- . ,.

5.
/~,
aI
6. -,Dj
7.
.>\
II
4.
,,--> ..
81
73
7
9= 3
1.
/{;
~mJ
.
2.
.r
l'DD
.l
,
3.
'-4'
II
j•
.,
4.
/~'
U)
..
5. J
.r,\
II
!
6. .
... ,Dj
7.
/l'
II
I
00
10
.13;

1
)
)
I
D)
I
•
11
)
.15.
- 8 = -4
,,,. -
tIYk'
-C./
."
C'''',
"+
X".;-"
5.
-
(9 +6-5) x8
20
1. ••~
,
2.
-'~:
D
3. .;a
4.
>\
IJ
5.
",
II
6.
0
7.
0- {a
8.
11
9.
",
II
10.
."y
a
11. ,,{
II
12. "
Il
... q... _I· .• llOl\lIrsll·--· .....· •.• )J .. (-_ .... _-~ .......... _----_ .... - ---- .....

13. •.. iii
6. "::g K"
2.00 +4+4+4+6=20
1.
,.'1,
~
mI
2.
U
II
I!J
I!J
I
3.
.- -,
aI
4.
lJ
I
5.
iii
I
6.
iii
j
7.
iii
I
8. aI
9.
.' ,
II
.I
10.
iii
12 I
2.00
2.00
6.00
10.00
14.00
14.00
20.00
.. ,_ ... £. .. ..d .. 2., .. : ........ : -------------------- ; __ ; .. , !It,JNIlIC.WIIIJ •. JIIl.JU ... :t.uu

0.125
--
"'
,,~
K" x"
on
2' =2x2x2
=8
1.
/(
~
I
2.
j~
fJ •
3.
'\
aI
4.
?~
II
I
•5.
II
I
"lIIIDl
K"l/x
on
Yo
=.125
•
1.
.. '
~•
•
2.
-'{
tI
I
3.
~.,,:
II
)
••
4.
,a
~'(
5.
a13 I
$)kJtlUkii.

.. ~
K" +
-.
2+3=5
6+3=9
8+3= 11
1.
-' i
~
I
2.
/;
aI
3.
••
a
••
4.
?!
II
5.
aI•
6.
<aI
7.
' '.
a
8. g
9.
,~
II
14
.JtSl
MJ .2!2

" ~
K"
..
-
5
-3
=2
8
-3
=5
10
-3=7
1.
,,:-
~,
'.
2. "
~<
Bj
3. <III
4.
;<
II
5
... '.
m
•
6.
't,
iii
7.
"m
•
8. .
•.. ;Ua
9.
<.
II
I
15
,Iii;
j. £At,

.. ~
K" x
..
3x6 == 18
3x5
== 15
3x8 == 24
1.
'';
m
2. fJ
3.
,- 'i
EI
4.
-<,
DI
5. "-
II
6.
0
7.
.,
II
8.
D
9.
-,
II
16
•.,§
,l9;;I~
§L

,. ~
K"
,
."
63 = 2
15
...
3=5
21
.,
3=7
1.
<,
m
2.
.(
D
3. m
4. a
5.
,'"
II
6.
J_f,
D\
7.
.. -,
II
8.
D
II
9.
II
,
17
•. 3 iQ r'
• sa.

•
3.75
150.
6.25
125.
0.05
0.05
1
I
l
l
18
,,
~
%
..
125 x 5%
~ 6.25
150 x5% =
7.50
75 x 5%
~ 3.75
1.
~
2.
0
3. •m
•
4.
EI
5. D
6.
II
7. ID
8.
<-'
II
9. "
Ii
10.
.' ~
iii
.... -rP

125.
125.
6.25
17.2
17.2
7.
"0/0" x
125 x5% ~ 6.25
1.
~~I
2.
D
II
I
3. .,
EI
I
4. iii
•5. f4 I
•
"0/0" +
17.20 + 5% ~ 18.06
1. "
~ ~j
2.
;, 'DD
..
DI
' ",
3. ' 0 i, gI
4.
iii
I
19
h-l
,,':i
jill
,,