Page 1
Page 2
Welcome
to
the
world
of
Victor
calculator
owners
Congratulationsonyour
choiceofa
Victor
electronic
calculator. Careful
design
coupled
with
the useofquality
materials,
painstaking
American
workmanship,
and
advanced
research
and
production
facilities,
have
given
you
an
instrument
which.
with
proper
care,
will
provide
years
of
trouble-free service.
To
keep
your
machineintop
operating
condition-and
to assure
its
giving
you the
long
service
itisdesignedtoprovide-be
sure to ask
your
Victor
representative
about
the
low
cost
protection
offeredbya
Victor
Full
Coverage
Maintenance
Agreement.
VICTOR COMPTOMETER CORPORATION
Contents
Functions
of
operating controls
2-3
Addition Isubtraction 4
Multiplication 5
Division 6
Memory group 7
Special functions
8-9
Power
raising key
Reciprocal key
Square
root
key
Pi
key
Change sign key
Exchange key
Logarithmic group 10-11
Trigonometric group
12-13
Degrees
Radians
The
finest materials and workmanship go
into the Series
1800
Electronic Calculator
assuring you dependable performance
over a long period of time.
Ninety day guarantee.
ThiS
Victor
1800
Electronic Calculatorisguaranteed
for
ninety days for parts and labor.
Any
guarantee.
statutoryorotherwise.
does
not
include replacement or repair
of parts when damage or defectisa result
of accident, abuse,
or
the elements.
Page 3
VICTOR
ELECTRONIC DISPLAY CALCULATOR MODEL 18-1721
'\()c>
rr"'
\..)
i !
Arithmetic:
Add. subtract. multiply.
divide and square
roOt.
Trigonometric:
Sin x. cos x. tan x.
arcsinx.arccos x, and
arctanx.Angles can
be expressed in terms
of
degrees
or radians.
Logarithmic:
Loge x. log,o x.eXand lOx
Special:
xv.
'Ix.
TT.
change sign.
exchange (reverse) operation
and accumulating memory.
Page 4
Function
of
operating
controls
MODEL
18-1721
ON/OFF
SWITCH:
Located beneath the
right
front. Left position is
"ON"
-right
position
is
"OFF".
CLEAR-ALL
KEY:
Clears amounts in the entire
machine. Sets initial state.
CLEAR KEY: Clears display. Also clears over-
flow
condition,
without
clearing keyboard.
ADD
KEY: Adds keyboard entries and causes
running sum
to
be displayed. Also, when
de-
pressed
repeatedly,
performs
constant
addition.
MINUS
KEY: Subtracts keyboard entries and
causes running sum
to
be displayed. Also,
when
depressed repeatedly. performs repeat
subtraction.
MULTIPLY
KEY:
Enters displayed value
as
multiplicand. Also completes a sequential
calculation and sets
that
resultupfor
sub-
sequent multiplication.
DIVIDE
KEY: Enters the displayed value
as
dividend.
Also
completes a sequential cal-
culation and sets
that
resultupfor
subse-
quent
division.
MEMORY
PLUS
KEY:
Adds entries or results
to
the valueinmemory.
MEMORY
RECALL
KEY:
Displays value from
the memory for useasany factororfor
reference.
MEMORY
CLEAR
KEY:
Sets memorytozero
without clearing display.
EQUALS
KEY:
Calculates results in multi-
plication. division, and
power
raising com-
putations. Retains multiplicand or divisor for
further computations.
SQUARE
ROOT
KEY:
Calculates
the
square
rootofany positive displayed value.
CHANGE
SIGN
KEY:
Changes the algebraic
sign of the displayed value.
PI
KEY:
Enters the constant
'IT
into
the dis-
play register.
EXCHANGE
KEY:
Exchanges the displayed
value
with
the
valueinthe
calculating
register.
RECIPROCAL
KEY:
Calculates the
reciprocal
of
displayed value.
POWER
RAISING
KEY: Raises X
to
the wh
ole
number or fractional y power.
Page 5
LOG
BASE
SELECTOR
SWITCH:
COM
po-
sition
(switch
up)
conditions
the calculator
to
compute
common
logs (log,o)orantilogs
(lOX).
NAT
position
(switch
down)
condi-
tions
the
calculatortocompute
natural logs
(loge) or
antilogs
(eX).
LOG
KEY:
Calculates the
common
log
(log,o)
or the natural log (loge).
INVERSE
KEY:
Conditions
the calculator
to
compute
the
following:
(a)
Antilogs
lOx or
eX.
(b)
Inverse trig
functions
sin-
1
,
cos-"
tan-
1
•
Nore: The
INV
key and
then
the LOG key
are
touched
for
calculating antilogs, and
INV
is
touched
priortotouching
the
SIN,
COS
or
TAN
keys
for
calculating inverse
trig
functions.
DEGREE/RADIAN
SELECTOR
SWITCH:
DEG
position
(switch
up)
conditions
the calcula-
tortocompute
the
trigonometric
functions
(sin, cos or
tan)ofan
angle expressed
in
degreesorthe inverse
trigonometric
func-
tions
(sin-
1
,
cos-
1
,
tan-')indegrees.
RAD
position
(switch
down)
conditions
the calculatortocompute
the
sin, cos or tan
ofanangle expressed in radiansorthe
in-
verse
trigonometric
functions
(sin-
1
•
cos-',
tan-
1
)
in radians.
TRIG
FUNCTION
KEYS:
Calculates the sin,
cos or tan
ofanangle expressed in degrees
or radians. The secant.
cosecant
and cotan-
gent
functions
canbeobtainedbyperform-
ing
cosine, sine and
tangent
functions
first
.
IX
. 1
and
touching
1 key I.e.,secanto = :c::-:c-.--;-:
cosine H
Calculates tl18
sin-
1
,
cos-
1
,
or
tan-
1
,
ex-
pressing
the
angles in degrees or radians
when
usedinsequence
wirh
the INV key.
To find
sec-'.
csc-'.
caC"
first invert secant,
cosecantorcotangent
and then
find
C05-
ine-
1
,
sine-
1
,
or
tangenc
1
,
respectively, Le"
secanC1
=cosine-
1
(
1 )
secant
(-)
OVERFLOW:
F is displayed
for
the
following
operations-where
results
are>14digits
to
leftofthe decimal
point
and entries
are>
14
digits
Other
functions
have been
definedtodis-
play
F:
• Divisionbyzero,
including
1/X
where
X
~
a
• Square
Rootofa negative
number
• Arc sine or arc cosineofa
number>
• Log X, I nX,andXvof
zeroora
negative number
•
Computing
tangent
90° ± n
180
where nisan integer
ACCURACY:
All
arithmetic
functions,
+,
-,
+,
X,
'Ix
and
,,-
yield14place
accuracy truncated
to
the
least
significant
digit
where
the valueofX is
:2:
10-14or
,;
10+14-1.
All exponential and
trigonometric
functions
yield12place accuracy rounded
to
the least
significant
digit
within
the
following
rangeofarguments:
log"
X and loge X X is
:2:
10-14or';
10"3
InverseloglOX
Xis:2:
-12.30r<+14
Inverse loge X X is:2:
-28.4
or <
+32.2
Xv
Xis~10-14or:::';;
10+
13
Note: For
Xv
the limitsofyare
dependent
on
the valueofX.
SinX,cosX,
tanX
XiS:2:
-360°or,;
+360
Sin-1X,
Cos-1X Xis:2:,
-lor';
+ 1
Tan-1X
Xis>
-10"or
<
+10"
12 place accuracyisassuredifarguments
are
within.01
of
a degree ± 90°
for
sine
and
cosine;or10
place accuracy
if
arguments are
within
one degree (1°)
± 90"
for
tangent.
To
assure12place accuracy
when
computing
functionsofangles>
360°
first convert
to
an
angle between ± 360",
for
example
convert
3600030°to30".
Specifications:
Usable
Temperature:
O·
Cto40·
C (32°Fto104°F)
Circuitry:
MOS-LSI
Power Input:
115
Volts
Ale
50/60
Hz
Power
Consumption:
18
Watts
<?{::
115
Volts
Ale
Dimensions:
10" x
11
%" x 5"
Weight:
6 Ibs. 2 ozs.
Page 6
Addition/subtraction
Addition/subtraction-automatic
repeat
Example:
ENTER
TOUCH
DISPLAY
123
123
-456
789.2561
.0039
123
456
789.2561
.0039
Ie'
j
I~
JO
579.26
Individual
totals
and
summary
totals
Example:
ENTER
TOUCH
DISPLAY
ACCUMULATE
MEMORY
8.7 + 15.5 = 24.2
01
U.
I
::1
u
::,
,_I..
L
9.8
5.7
5.5
3.2
9.8
5.7
5.5
3.2
Page 7
Summaryofexamples:
Simple
multiplication
Chain
multiolication
Multiplication
with
constant
multiplicand
Memory
accumulation
Simple
multiplication
and
chain
multiplication
Multiplication
Examples:
12
x
13=156
2
x3
x4
=
24
ENTER
12
13
5.67
2
3
4
TOUCH
DISPLAY
Memory
accumulation
and
constant
multiplicand
Example:
12 x 13 =
156
12x14=168
-(12
x 15) =
-180
ENTER
12
13
14
15
TOUCH
••
•••
.11
DISPLAY
-
-
-
-
-
ACCUMULATE
MEMORY
ACCUMULATED
TOTAL
Page 8
Division
Summaryofexamples:
Simple division
Chain division
Division
with
constant divisor
Memory accumulation
Simple
division
and
chain
division
ENTER TOUCH DISPLAY
15
-
6
-
24
-
4
-
3
-
15+6=2.5
24 + 4 + 3 = 2
Examples:
Memory
accumulation
with
constant
divisor
Example:
ENTER
TOUCH
DISPLAY ACCUMULATE
MEMORY
180
-
20
-
240
-
360
-
-
ACCUMULATED TOTAL
180 +
20
= 9
360+20
= 18
240
+
20=12
Page 9
PRIME
USESOFMEMORY
I
Accumulate
keYboard entriesorresults
II Store keyboard entries or results
Accumulation
and
storage
Memory
group
I.
Accumulating:
(2+3)
-
(3x5)
+
(12~4)
+
10=3
II.
Storage:
1.265 x
(1.265
+ 1)
~5-
ENTER
2
3
3
5
12
4
10
ENTER
1.265
5
1
TOUCH
TOUCH
DISPLAY
DISPLAY
ACCUMULATE
MEMORY
ACCUMULATE
MEMORY
Page 10
Special
functions
Power
raising
key(xto
the y power)
Examples:
12.5
1.3
12.5.
1
.3
ENTER
2
5
12.5
1.3
12.5
1.3
TOUCH
DISPLAY
Reciprocal
key
Calculates reciprocalofdisplayed value.
Example:
Obtain raciprocalof8
Calculate:
2 7(4
ENTER
8
2
4
TOUCH
DISPLAY
Square
root
key
Calculates the square rootofany positive value.
Example:
Compute .../156.25
ENTER
156.25
TOUCH
DISPLAY
Page 11
Pi
key
Enters the value.TTin the display.
Example:
CompUle areaofa
circle where: r = 5
(Trr'
)
ENTER
5
TOUCH
DISPLAY
25
Change
sign
key
Changes the algebraic signofthe displayed value.
Example:
-7.265
x 75
Calculate
4.75-
114
ENTER
1.265
15
4.75
4
TOUCH
DISPLAY
Exchanges
the
displayed value
with
the
value
thatisin
the
cal-
culating
register. This exchange either reduces key depressions
Exchange
key
or the useofthe memory in certain sequential calculations.
Example:
4+3
(6 x
2)
+ 7 - 5
-.5
ENTER
6
2
7
5
4
3
TOUCH
DISPLAY
Page 12
Logarithmic
group
Computes:
Logarithms log,o and loge (In)
Antilogs
lOx and
eX
COM
Set
log base
NAT
Computing
common
logarithms
10910
Examples:
Evaluate:
The
log,0
700
The
10glO
101
The
lagro
.001
ENTER
100
101
.001
TOUCH
DISPLAY
Computing
antilogarithms
10
x
Examples:
Evaluate:
The
antilogof3
The
antilogof- 3
The
antilogof5.5
ENTER
3
3
5.5
TOUCH
•
II
•
DISPLAY
Page 13
Logarithmic
group
COM
Set log base
NAT
Computing
natural
logarithms
10ge (In)
Examples:
ENTER
TOUCH
DISPLAY
Evaluate:
The
loge
1
The
loge 100
100
Computing
antilogarithms
e'
-
, "
~
...
)1:";'-:
Examples:
ENTER
TOUCH
DISPLAY
Evaluate:
1
•
4
II
•
12
•
•
-,..,
The
antilogeof
1
The
antilogeof
12
The
antilogeof
4
Page 14
Trigonometric
group
Computes:
Trigonometric functions sine (SIN) cosine (COS)
tangent
(TAN)
Inverse trigonometric functions arcsine
(SIN-
1
)
arccosine
(COS-')
arctangent
(TAN-')
Degrees
DEG
Set degree mode
RAD
Computing
trigonometric
functions
Angles expressed in degrees
Examples:
The
sinof30'
The cos
of
45'
The
tan
of
135
0
The
sin
of
395'
ENTER
30
45
135
395
TOUCH
DISPLAY
flll1"'1
rnc
10
( rn"'l
U.
ILl
I
lULl
ILl1Ie'
f
Note: The signs
of
the trig
functions
are correct and depend on the
quadrant
of
the argument.
Computing
inverse
trigonometric
functions
Results expressed in degrees
Examples:
ENTER
TOUCH
DISPLAY
The
arcsin .511
.511
•
II
,..' ·tjj
;"'~:;J
The
arccos .9763
.9763
•
The
arctan 1.0427
1.0427
•
II
12
Page 15
Radians
DEG
Set
radian
mode
RAD
Computing
the
trigonometric
functions
Trigonometric
group
Angles expressedinradians
Examples:
The
sine
of.
5 radian
The
cosine
of.
6532
radians
The
tangentof.875
radians
ENTER
.5
.6532
.875
TOUCH
DISPLAY
Computing
inverse
trigonometric
functions
Results expressed in radians
Examples:
ENTER
TOUCH DISPLAY
The
arcsin 7 1
••
The
arccos .9876
.9876
••
The
arctan 7.1254
1.1254
••
<13
Page 16
rictor
products
and
services
The Series
1800isonly
oneofa vast
family
of products made by Victor, America's foremost
producer
of
desk-top
figuring machines.
Included in its array
of
related productsisa
complete range
of
electronic and mechanical
display and printing calculators and adding
machines.
Other business products include electronic and
mechanical retail
point-of-sale
systems,
Electrowriter and facsimile transmission systems
for
business, institutional. and industrial
communications. Victor Temporaries. a national
networkofcompany-owned
temporary help
offices, make a variety
of
administrative, clerical
and marketing skills available
to
the business
and industrial user.
Victor
is also diversified in its manufacture and
marketing
of
leisure time products.
Among
these
are
PGA
and Burke
golf
clubs and accessories,
Daisy-Heddon sport shooting and fishing
equipment;
Bear Archery equipment, Valley Pool
Tables, Ertl toys, and Nissen trampolines and
gymnastic equipment.
~VICTOR
120-82-1
ViCTOR
COMPTOMETEA
CORPORATION
BUSINESS
PROOUCTS
QIVISION
CHICAGO.
ILLINOIS
60618
IN
CANADA:
VICTOR
COMPTOMETEA
LIMITED•GALT,
ONTARIO
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