National Semiconductor 4660 User manual

3
Getting Started
Your calculator 15 designed foreuy leam"'9 and
erhclent operallon 11 is re<»mmendl!d mal you
charge your calculalOr
lor 3 hours belore inilJal use.
see Ballltty Inlof/nahon. To Qet slalted, turn your
cateuL1101' On With the .sw,tch on me left .s,de. The
dISplay Wll shows d~'tor(lIg11S. Depress
10 dear ltIe(lI.splay. The dIsplaysl'\l)Uld now show
•slnglezetO. If II don nol, Ih, baltery probably
needsrecharging,
low Battery Indicator
All 'l IIghtsonthele~srdeofthe(lrs~aywtJe'n
tile battery neeGS red\vs,ng Charge Ihe ballenes
Immediately.
Double labeled Keys
~otiCe thai many OIl'll! keys on )'OCr C'ilIQ;l2.ICr
have TWO lIIbels, I.,e,. a de~llgnation appears above
and below the key. o
Doubly labeled K~
M-
ThIs means tha11he WI has two llJ!lCtJCrlS. When
me key is depressed dUl!C11y after the • the lower
function. e.g (memory pll.ls) is accessed. In
this manual, F Is Illustrated as a requ!red prelix
lO aU secondary IU1ICtIOos.. The M· (me.rr.ory plus)
lorexample .... olItles!'lownas F M~_lf F has
been depressed by mistake. depress to cfeaI
the erroneous dep(l!'$$.on w,lhout aft'eeting lhe
display or calCulatiOn in progress
Keying in Numbers
Aeating Decimal
The Sland,uel formalin ... hlch numbers withIn the
ringe ,0ס0ooooo1 109.999.999.999 are entcred and
ell'played
Is the lIeahng decImal point formal. Num-
2
bel'S anI enlcl&d in the normal calCulalor fashion.
i.e,.
Key In ""mbels by IOUChlng the number keys tn
J" the 58me .sequence as ir you were wrillng!hl!fn
Oown on paper. II a decimal appeals In the number,
key illn sequence as pan ollhe number. The
calcu1410r accepts me IUSI deCimal keyed in as the
decImal in Ihe number. The dec1l1\81 need tIC' be
keyed in .... hen k~,f'g in WhOle numbers.
The dectmAI pcinl Itt !he result ola ealelJla\ion Is
automatically poSllroned.
This is known as "lloatll'lg
point"' nOI&Ilon because the eleelmal pelnt can
"Iloat" 10 any digrt location.
Results of calCtJlallOns \II !'\len eUN(! 9,999.999,999
or va Ies.s than .0ס0ooooo1 are automatteaUy elIS-
played In sclenllflC natallon s,nce the: number of
display digits cannet accommodate these \rery large
or very small numbers in me floaung POint formaL
SCientifIC Notation
Any num~ ... ,th1n me range 10·" to 10" maybe
erl:eree ,nto yow calctJla:or and dISplayed In
sClenllric no18llOn using •Enter Exponenl key.
Entries In scien:.ll(: natallan ve made as !hey are
wtll:en. Ie ,a dl!'CJmAl n!Jl'nela! (relerred 10 as me
rnantissa) between 1 and 9999999999 and a
power of ten,
Scientific Notation Entry Procedure
1. Key Itt !he man\.is.sa a.s a dec,mal number
between 1 and 9999999999
Nole. II the mantissa IS keyed in as a number
OUtside tlM range. 1Jle calallator WlQ automaac-
ally 21:llustlhe manllSsa and ellponent upon
depressiOn 01 aflli'lcliOn key. See example 2.
2_ Depress ;00 is Olsplllyed In lhe exponent
dllplay pOSll1cns-
NOle.- tI amanhSSa entry is nol keyed in prior
to depre.sslng •!he calculator 8\llOmaticaily
assumes end elisplays amantissa of I.
3. Enler the power of len ellponent ellgll(s).

To cancel SclenUllc NotatIon mode and set
Floating Decimal mode.
depress II
Observe in lhe example belOW thai resul1s which
exceed9,999.999.999
or are lass than .000000oo1
are automallcally converted to-sclenlitlc nolallon.
Observe in the next okample thai in the scienlilic
mode. enlries and resulls of calculations are
displayed in scientific nolallon even when you key
in facl0rs withoul an exponenl.
ENlER OISPLAY
COMMENTS
COMt.lENTS
SelS scientific
mOO9.
AlltOlllatical1y
converl.IO
tll)llti~ notation.
5. 00
5. 03
5. 03
2.5 07
OlSPLAY
DISPLAY
5.
1. 01
1.2345 04
2.469 04
5. 00
503
5000.
25000000.
to eslablish Ihe Sclenl;fic
•
•
•
12345 •
2.
Depress
NOlation mode.
ENTER
In scientitlc nOlalion using •• upon depression
01 afunction key they will be convened to l10ating
"' decimall'lOtalion it capacity permits.
Example:
ENTER
5 IEII
3
•
•
2
2. 00
2.
0'
52 15
2 2. 52
7
2.
27
C
Example 3: Enter 2x 101~ and then chatlge the
exponOn! to 27.
ENTER DISPLAY
Reformat Display Keys; and
When the calculator is turned on it is in the Uoaling
decimal mode. Although amoun;s maybe entered
,
4. 19
3.
00
1.2 28
Note: It more than two digit keys ale d.e~ressed
directly following •. the lastlwOdigIts .
entered constitute
1/Ie eJlponent and the earlier
enleted digitsare discarded. See example 3.
Example 1: Solve (4 x101t) X. (3 x 10'):: 1.2 X10
28
EN"TER olSPLAY
44. 00
19 .. 4 19
3 3. 00
8 • 1.2 28
Example 2: Solve the preceding problem, except
enter
40 x lOla instead of <I x10
lt
10 observe
automatic normalization petlormed on mantissa
entries outside the range 1to 9.999999999.
ENTER DISPLAY
40 40. 00

", .. TEll DISPLAY
• O.
123456 •123456.
789123. 9.742196909 10
Calculator will display 9N219S0000 in scientific
nol8ill)fl because II e~ceeds lO-dlgil capacity.
Changing Signs:
The • change sign key. changes tho algebraic
sign of an entry or result from positive to negative
and vlce versa. Depress a:fler mantissa enlfy
or after depression 01 10 enter these respec-
I/Ve vshJes as negatives.
conlenlS
Of the caleulallflg regISter. OpetalJOfIS are
1'101 ditlturb&d an<:! may be CQnllOued. The Ilurpose
ollhis funcllon ,s 10 enable collection 01 mistellen
dlgll key aepressions.
Depressed directly 10Howing otnar knys
(lnclu<!lng
C. Ie., two COnseeulrve akey depres-
siOns). Clears
display and calcuiating feogiSler,
The key sequence , clear alt. clears tho
display, calculator register liM lIlIth'eo memories.
Any
mode setting. ie .scientifIC notallDn (SCI),
floattng decil'NlJ I"IOtalion (Fl T), (Jagree, radian or
grad mode. 's IlOt cleared by depressron of .11.
2
Example:
E:.~lEll
Basic Arithmetic Operations
The proeedule forperfOrming -simple addlllO(l,
SUbltSCllon, mult,plicaltOn
or dlVislon!s to key I/'l
the problem as ills written,
Enlerflrst number; depress ., •• 01 ••
Enler the second number, dopress •.
Ills a good practice 10 depress beforeperform-
ing calculatIons in order to clear any calculatior.s
pending flom pteV10US key dePl'essions.
COM~EtHS
5000 •
eNTER
Multilactor (Chain) Calculations
The floallesull of any cakuJalionrnay be used In
fUrlhel ealculahOflS, elimlnalng the need:o re-enlel"
the value.
Exompla: Apiece of equipment costs S5OOO.
Thesalvage value Is $1200. Find the deprGCiaJlon
expense per year il tlle equipment haS 8lifetime
of eIght ~·oars 5000 _1200
Formula' =415
•
OtSPu..y
5000
I
DISPLAY
-455.
-456. 00
-456. -00
-456. -02
-456. 02
O.
Observe thaI may be depressed at any
time
during exponenl entry.
Clearing Mistaken Key Depressions:
and
The ,clear key, Is designed 10 keep operator
decision 10 a minimum. Depress dlJeclJy follow-
Inganerroneous key deoression end the calculator
WIll clearthe alleaed reglster(s) only. MOre
explicitly, operates as follows:
Oepressed dIrectly following l1 digit key or
fj Clears the digit key depression and displays the

5'><2x3><;:\
... 7" 8-3=32
6
EfH£Tl DISPLAY COMMENTS
5
5.
210.
Previous lnstruc-
\Jon 8UCUted.
330. Intermedlalll
120, BOSWIlf
4dIsplayed.
620.
727.
,.
35.
3.
32.
Two Factor Function Keys
The fonowin~ srequire fhe entry of two (or more)
factors:. •The firsl factof is
entered on one of lhese keys. The second laclor is
entered
on. 10 complele the calculaliolls,
Although you already know
how to add, subtracT,
multiplyand divide from previous sections; the
following functional descripUon of
II •and
•Is given along with edescription 01 for a
complete unde/standing
01 the relalionship of the
IWO lactor lunclion keys,
Divide Key
Enters the dividend (Iirst number
In diviSfon). For
Example:
Since your calculator uses lrue algebraic logic,
no
guess work orknowledge 01 malhemallcal hierarchy
Is required to perform long. complex problems.
An tnHnire number of problems
ml'lY be chained
together. The calculator
dise!:.YS an intermediate
answer upon depression of
••• ,.,.,11
lor inlormation purposes !!nd to remind you that
upon depression ollhese koys any pending adcl.
subtract mulliply. divide, or power command is
executed,
May be tIl5ed In
fUrlhar caleu!aUolUi.
DISPLAY
3800.
3800.
475.
5000,
3800.
475,
ENTER DISPLAY
144
144.
'Ill
72.
"El
6.
5000 •
1200.
III
'.
Rule for performing chain calculations
Perform the problem as it is wrillen with one
excephon; rewrite formulae which indicate mUllI-
plication in the denomlnalor portion 01 fraclions
as shown below.
Use parenlhesis keys
When necessary. I.e., Vlhen
addllion/subtracUon Is mixed
wUh multipUcationl
dlYislon
to form aparenthecated expression.
See Parenthesis Keys section
of this manual.
Perform
on calculator this Vial':
144';'2';'12=6
Do not perlorm on calculator as wrillan here:
144
_6
2)< 12
The same problem may be performed more elfi-
clelllly. with fewer keystrokeS. by using the cha/nfng
fealure. Perform the problem as you Vlould say it,
depressing. only once, on completion of the
problem: 5000 minus ( ) 1200 divided ( : )
by 8equals (
),
Short Method
ENTER

Equals Key
Terminates a two lactor calculatIon. +. -. X • ..;.-.
V<, and displays the final result. Causes the value
enlered on .to be stored as aconSlant divisor,
multiplier. subtrahend or addend depending upon
lhe operation. If no algebral¢ operalion is pending,
!'lumbers entered on -WIll
be used for calcu-
laUons with the conSlant.
I!Il Vto the )O;I~ Power Key
Raises anumber enlered on V'" 10 apower
entered
on -
cham calculatIons it completes a "pending lWO
factor calculation" {i.e. a "+.~. X.";'-. '(''' calcu-
lalion which is in progress, not yatlermimlled by a
depression of .). When depression of this key
completes a pending calculal1on. lhe Intermediate
result
is displayed and set up as a dividend.
Times Key
Enters tile multIplicand (firs! number in multiplica-
tion}. For chain calculations, completes a pending
twO factor calculation and sets up intermediate result
asa
multiplicand: displays intermediate result.
Minus Key
Enters lhe minuend (top or lirst number in subtrac·
tion). For chain calculations, compleles a pending
two factor calculallon and sels up lhe intermediate
resull asaminuend,
displays intermediate result.
•
Plus Key
Enlers the addend. For chain calculations, com-
pletes apending lwo factor calculation and selS up
lhe intermediale resull as an addend: displays lhe
Intermediate result.
Performing Constant Calculations
The second factor In a IwO lactor calculaUon is
retained as a constantin the calculaling register.
~)(2=&
COMMENTS
Plobtcm palrormad
In standard manner.
5.
10.
G.
OISPLAV
S
2.
3.
To use the constant:
Petlorm an addition, subtraction. mvltlpl1callon or
division problem in lhe usual manner remembering
10 enter the constant value las!. on •.
Enter variable numbers: depress •. display
shows answers.
ENTER
Example 2: COmpute {125';- 5)-J.2 =.000033619
ENTER OISPLAV
125. 125.
525.
-3.2
•0.000033619
Theexample above lIIustrates thai luncllons just
like ••••• and. In that it completes a
apending two
lactor calculaHon WhIch in thiscase
Is
"'25 divided by 5" and sets up the InlermtK!iate
result. 25. as "Y".
Ymust be positive IV >0). Xvalue is unresl1lcled.
Correcting Mistaken Function Key Depressions
When
you depress an incolTectlWo faclor function
key. adepresslon of the correct IWO faclOr lunction
key
will change lhe mode of operation 10 Ihat which
you originally Inlended. It Is therefore nol necessary
to clear the calculator and re-enter your probtem.
For example,
ij you depress. inSlead ot •• IUSI
depress. dlrectly alter. 10 change Ihe mode
of operation to subtract.
Compute
53 =125
OISP\.AV
s.
125.
E)O;ample 1:
ENTER
S
1Cl
3
iii

One Factor Function Keys
The single laclor function keys are the easiest
10 use and understand, These keys are:
oOS·
To record anewconstanl. simply perform another
addition. subtraction, multiplication, division or
power problem In the usual manner.
When y~ is used, the power, "x" is retained
as acanslam.
ENTER DISPlAY COMMENTS
13.
169.
13'=169
2S.
S'=25
9.
3'=9
,
•
8.
lD .
4,.,2",8
5,,2=10
folloWing key descriplions assume the degree mode
seiling. Adiscussion of lhese modes
foHows on
subsequent pages.
Sine Key
Enter Into Ihe display adecimal angle wilhin the
range -8999.999999° to 8999,999999°,' Depress
Ihls key: display shows sine
(Xl·
Arc Sina Kay
Enler into tha display aslna Within the ranga -1 to
1. Depress these keys; disptay Shows the principal
value, -90°" result" 900,of Iha arc sine (x).
CO Cosine Key
Enter into the display adecimalangle wilhin the
range -8999.999999° to 6999.999999°,' Depress
this key; display shows
cosine (x,}.
'S Arc Cosine Key
Enter into the displayacosine
wilhin Ihe range-1
to 1. Depress these keys: display shows Ihe principal
value.
0°" result" 160°,01 the arc cosine (Xl·
Ageneral procedural statement can be applied
10 Ihasekeys:
With avalue entered inlo the display. depression of
aone laclor function key executes the Indicated.
sin,cos ,r
elc .. function and instantly displays
the answer.
These keys may be depressed a\ an:/ lime o'Ullog
acalculalion wllhou\ disturbing any two laclor
calculation in proglCSs. This feature provides greal
flexibility in problem solving as
shown in the r
examples on subsequent pages.
Trigonometric Keys
Your calC1Jlator has Ihree selectable modes of oper-
atlan lor lrigonomelric and lhe inverse functions:
deglee, grad or radian mode. The calculator
is aulO·
matically5el in degree
mode upon tum on. The
12
Tangenl Key
Enterinto the display adeCimal angle within
the
range -8999.999999° 10 8999.999999".' Depress
this kay: dIsplayshows langent (x). Error will be
displayed
on entries of 90".2700,etc.
rA'J'li Arc Tangent Key
Enter Into lhe display atangent
01 unreslricted
magnitude. Depress these keys: display shows the
principalvalue. -90"'" result" 90°, of arc tangent.
Logarithm Keys
Natural Logarithm Key
Enter InlO lhe displayevaillegreater than zero.
Depless this key:
display shows 1he basee.
naMat logarithm (x).
'Very 'Small numllers. B." •. סס0oooooo1 Qr I X 10->0 arc
mlerpreted 85 ZC/O Wilen IlnlcrC(l on trillonornetn"c keys.
13

30 G.5
60 0.866025403
•0.433012701
144 12.
•12,433G127
EJeample Problem: What is the equivalent ,esls·
lance ora nO·ohm reslslor, a l45·ohm resIstor.
and a175-ohm reslslOr connecled in parall&[ \,lS11I9
lhe following eo.uation?
R --'c
'
-~
... - 1/R
1
-+-l!R2+
t/R3
1
ObselVe In tha a~amples abovo and belew.thal
one laClor tuncUon keys may be depressed while
atwo laclor operation Is pendIng wilhout allacting
the pending calculalJOn,
175
•IlIlI
1S
DtSPLAY
0.004545454
0.cl04545454
0.006896551
om 1442006
0.005114285
0.017156291
58.28765335
-
1/220-1/145 .... 1/175
(sin 30)< Sin 60) '4- \1144
OtSl'LAY
Find the cube rOOI 01125
Formula:
3y"i25::: 1251/3
DISPLAY
125.
0.333333333
S.
'"
•
EHlER
125.
3.
•
Example:
ENTER
uample:
,
,
Olher One Factor Function Keys
Square Root Ke~
ner apositiVe radicand into the display. Depress
this key; displayshows the square root.
• "X" Squared Key
Enter avalue less than
or equal to 10'0 inlo Ihe
display. Depress Ihese keys: displayshows the
value squared.
Reciprocal Key
Enler 8non zero value Into the display. Depress
these keys; display shows result of 1divldeo by (Je).
Factorlal Key
Enler apositive Inlegerwithin the range 0to 69.
Depress these keys; display shows the faclorial.
•• Natural Antilogarithm Key
Enter analtJralloganthm wlthln
lhe range -2279
to 230.2. Depress Ihesa ke~s: display shows e
ralsed 10 lha power enlered.
Common Logarithm Key
Enter into the display avalue greater than zero.
Deptess lhis key:
displa~ shows the base 10,
common logarithm (Je).
II Common AnlHogarlthm Ke~
Enter acommon logarithm wlth!n the range
-99,99999999 to 99.99999999. Depress these
ke~s; displayshows lO~.
One Factor FuncUon Key Examples
Example: Compute 5.121011 2.3
ENTER DtSPLAY
5.12 5.12
2.3 0.361727836
•1.805355312
14

COMMENTS
-, -;;0"''"'''' ~
(10-4) I
0.707106761
Impartanl NOlO: Remember Ihal your calculator will
remaIn in the angular mode last selected unlll you
turn
off the catculator orchange the mode to
degree or ladian.
Degree/Grad/Radian Conversion
Converting angles (for example, from degrees 10
grads) is done by compUling atrigonometric func-
Iron in one mode. switching modes. than computing
the inverse trigonometric function.
I r~lllian
57.29517951
deoreeS
45 dcgrellS-
SO grads
0.541470964
0.641470984
57.29577951
0.707106781
0.707106761
50.
How many degrees is 1radian?
OISPLAY COMMENTS
How many grads is 45 deglees?
OISPLAY COMMENTS
Calculate lhe sine 0150 grads.
OISPLAY
Example:
ENTER
Example:
ENTER
E
Conversion Keys
Polar. Rectangular Conversion
The angle of Inclination inpul for polarto rectang-
ular and angutar
Ol,nput tor rectangulal to polarIs
affecled by
rhe degree/grad/radIan mode selllflQ. 17
Example:
ENTER
,
{
p _ _c--"".c
'
~
.,
(n-r) !
OISPLAY
'".
720. {10 - 4)1
720.
720.
• 50~O.
Observe that in the exampte above. lhe x-y key
(see
Olher Keys seclion for adiscussion of x-y)
is ~sed to swap the dividend and divisor. In orher
wOlds. lhe
ploblem was performed such thai
(1D-4) 1/10! was pendIng. Theformula was
leversed; 1
OU(l 0-4) Iby depressIng
Examplo: Permulatfons
For example: Out 01 adinner parly for 10. how many
ways can the hostess assIgn players to One table
of bridge
(4 posillons)? The equarlon for permuta_
tions
wUh random arrangement 01 n ilems laken r
at a
lime is:
Degree/Grad/Radian Mode:
IlmiI [ClB1\:Ql
As staled previously. yourcalculator has three
seleclablemodes
of operalion for lrigonomelric and
Ihe inverse tunctions: degree. grad
or radian mode.
When you
lurn your calculatoron. il is automatically
selin degree mode. In de ree mode. numbers
entered
on are inlerpreted as
degrees. Angular results displayed
altel depression
olB .n .11 are given
in degrees.
Depressing
or ,sets the
calCulator In radian or
glad mode respectively.
Angular input
on Irig lunct!ons and angular results
on Inverse trig funCllons are then lead as radians
orgrads.
16

Example: Convert the foliowirIJ polarcoordinates
to reClangular coordinates:
Aadlus=10.5 0=55°
Radius =70::: 30"
ENtER DISPLAV
10.5. 10.5
55 •6.022552562
•8.601096465
7. 7.
30. 6.062177827
3.5
The angle of inclination, 8,1$ read in deg/o&s.
radiaM or grads according 10 the mode selting.
Con~erls reclangularcoordinates to polar coordI-
nates. The ''Y'', northing coordinate is entered on
.' the "X", easting coordinate Is entered on
POL. The displa\!shows the 0angle expressed
in degrees, radians
or grads depending on the
mode selting. Depress to read the radius.
Converls
polar coordinates to rectangular coordi·
nates. The radius IS entered on 8: the angle
explessed In degrees, radians or grads depending
on the mode sat\lng, IS entered on •The
"X", easting coordinate is displayed. Depress
to read lhe "y", nonhing COOldinate.
1
!
11II
2.'
t4.'ii142162
10.33247308
Angle 9
RaduJIf
,
,
Example: Converttl:le following rectangular
coordinates to polarcoordinates:
Y=5 X=3
Y=2.6· X=10
COMMENTS
OecimallHlu,v.
011Iooas·,5·
OISPLAY
O.
5.
59.03624347
5.830951895
COMMENTS
Angle a
Radous
I
I
Degrees, Minutes, Seconds/Decimal Degree
Conversion
III
The key sequence •• ,to degrees, convens
degrees, minutes, seconds
to decimal degrees.
Enter the angle e~pressed in deg/ees. mInutesand
seconds as follows:
1. Key In degrees.
2. Depress the decimal point 10 separatedegrees
from the
minutes/seconds portion oi your entry.
3. Key in minutes as atwo-digit number, e.g"
3minuteswould be keyed in as 03.
4. Key in seconds.
Depress".; display shows degrees. minutes,
seconds
con~erted to decimaldegreos.
Examplo: Con~ertll0 degrees, 35 minutes,
15 seCOnds to decimal degfees.
ENTER DISPLAV
110.3515 II 110.5875
19

Converts the number in the display from centi-
meters to inches.
Example: II the electrical schematic for your
Mercedes calls lor a45.S-cm lead wire, how many
inches of wire would you need?
ENTER DISi>LAY
45.5 17.9t336583
III
Converts the numbor in the display Irom
tdlograms to pounds.
Example: l! an
U.S, Importer receives 1:1 42·kg
shipmentlrom Holland
IlIld Ihe shipping charge on
lhe AmerIcan ship is 23¢ per pound, hOw much
does
the Imporler pay lorshIpping?
ENTER OISPLAY
42 92.59414399
.23 •21.29665312
C
Converts the numberin the display from inches
10 cenlimelers.
Example: II to Ox adress, awoman needs a
5-lnch
lipper, how many centimeters of zipper
should she order 'rom the french slore?
ENTER OISPLAY
12.7
Declmal manllours
38 hrs, 15 min,
2.25
38,25
38.15
degrees to degrees,
•
DISPLAY COMMENTS
45.59t7 or4S059'11-
Compute the langenl
of 56°42'16~.
OISPLAY COMMENTS
Not necessary II
pravrousl)' Sellor
deglCe mode.
56.4216
2,15
17.
T~js key converts decIma' drees to degrees,
minutes and seconds.
Example: Converl45,
minutes
and second
"""
45.988
Example:
ENTER
56.70444444
1.522611881
The and keys are especially useful!n
calculations dealing with time. Hours. minutes and
seconds correspond to degrees, minutes and
seconds, thelefore, the and keys can
be used to convert hours, minutes and seconds
fHMS) to decimal hoursand back.
Example: How many manhours are expended
if17 people work an aproject ror 2hours and
15 minutes?
eNTER DISPLAY COMMENTS
21
Converts the number in the display from U,S.
gallons to lilers.
Example:
II aDUlch Ilrmimports 30gallons 01
Cahfomia wine. how many 2-lIlercarafes will thay
need to bollle the wine?
ENTER OISPLAY
30 II •113.56236
2 - 56.78t 18
COMMENTS
Kilograms 01
sugar used.
DISPLAY
1.'3607772
Converls the number in the display Irom pounds
to kilograms.
Example; 11 a FrenCh chefuses an English recipe
calling for3pounds
01 sugar, how many kltograms
must the chef use?
ENTER
Metric Conversions
3111 ..
20

23
numberIs s:oreoln the lesoeCwememory one,
two or ltIree Arrt number Ple"l'tNJ51y SIC>fed U'\
memoryis erued; i.e.ltIe new number "Wl'1tes
ovef" an: previous mem0'Y contents. The dIsplay
does not chllnge.
Key Sequence
,
II 2Memory Recall Kay
III'
Depress. lollowed by a dlglt key t • 2or 3:
contents ollhe respective memory ara recalled
to Ihedisplay. Recalling mam0'YcontenlS WIll not
clear the memory.
Memory One Plus Key
aya numberInto the display, depress this key: the
displayed number IS added 10 conlents of memo'Y
one and the resulting sum Is SIOled in thaI memory,
Depress. 1to fead \he sum.
Key Sequence
.. ,
iii 2Memory Plus Key
,
ey anumberInlO the display. deplessthese keys;
the numbosr is added 10 the respewve memory one.
two ollhree and the sum is slO~ In lhal memory.
The display does nol ctIange, Recall mell'lOry con·
tems 10 the display using \he MR keylollowed by
adigl! key to see the sum.
Key Sequence
.m,
• 2 Memory Minus Key
•• '
Key anumber InlO rhe display. depress thase keys:
the
numbel.s subltacled from the lespectlve
memory one. two or three and Ine rllS\lllingdilfel-
ence Is slOfed itt that memory. The d,splaydol!!s
nOlchange,
COMMENTS
(Close, but
not (llllle']
DISPLAY
-32.7771771827
Converts the number In the display from C'egrees
centigrade 10 degrees fahrenhe,t
Example; I( the dO'Clor In Toronto leUs you lhalyou
have aremperalure 01 37<>C. should you worry?
ENTER O'SPLAY COM"'ENT$
37 98.6 (No neea
10 WOfJ)II
/
(They need 56 cerales. and lhe;e"s aIInle
left over 10 drink!). ,;
~nYCflS lhe numbor 1,.~sPtaY 'rom lilers
10 U.S. gallons, /
Example: If the Flelyou buy in Italy hasa48-lIler
lank capaCity, how many gallons will tho carhokl1
ENTER DISPLAY
48 12.68025779
Convons the number in lhe display from degrees
lahrenhelllodegrees centigrade.
Example: The anlilreelc sticker on your Catica
saj'S thai antlfreeze should
be added.aI-3S°C.
If lhe temperature is -27°F. shOllId you add lhe
antllrecte?
"" ..
Memory Operations
Yourcalculal0r fealures lhree Independent
memories Which operaleas
10110''1$:
;pj) ~quenco
= ~ Memory Store Key
", f1'i anumberInto tha display depress MS
allOWed by, " . , •
22 gil '1'/ 1 • 2 or 3; the displayed

•
152 til
7.41 •
7 ••
6,73.
<sa
255 II
Sequence
,
2 Memory Times I(ey
3
Key a number Into thedISplay, dapress lhesekeys;
the
number Is mulllplied by conlenlS 01 the respec_
live memory and Iho resulllng product is Slored
In thaI memory. Tho display does not chango.
Key Sequence
R ,
Ell 2 Memory Divide Key
3
Key a number into the display. depress these keys;
the contents of the respecllVe memory are dlvided
by display contenls and the resulting quotIent is
sloled in Ihat memory, Display does not change.
Key Sequence
,
2 DIsplay/Memory Exchange Key
3
Key a,.,umber inlo the dIsplay. depress these
keys; the contents of the respective memory are
excha,.,ged ...... th the conlenls 01 the display.
Ctear Alt Key
Depress these keys to clear memori~ Also clears
dIsplay and any
pending operation (add. subtract,
etc 1 in the calculator register.
Memory
Overllow
If the result of amemory operation exceeds the
capac,tyof :hecalculator. 10-" to 10", &'01 Is
displayed, The alfel;led memory ..... ill contaIn the
value dISplayed pnor 10 the overflow condition.
Example: The fo110will9 quantities of parts for
constructIon of adevice ate priced as follows
Pourr NO. QUANTITY PRICE
A152 57.41
a. 76 S6.73
24 C 45 52.55
Find the lotalcost of conslluetlon.
ENTER OllPLAVO.
152.
1126.32
7.
511.48
<S.
11475
1752.55
Example: w,n three works of mvsic. Olle fastIng
Ihour, 14 minules, 43 seconds. lhe second laslH1g
36 minutes.22 seconds and lhe thIrd taS\.lng 1l1our.
9 mllw:es and 2seconds fil 0,., e 3-hour \ape?
EHlER OISl"lAY o
1245277778
0606111111
U50555556
3.001944444
3.0007
Calculating Mean and
Standard Deviation
The followlnl41 keys allOW fast end easy catculation
of slarl(!atO deviahon and mean.
.. Sigma Plus Key
Key in adata point, "x"; depressthis key
1. "lI" is added on memory ana
2, "x~" Is added In memory lwa
3. Memory lhree Is oncremenled by I lor U'l6 n
01 ilem coun!.

2.588435821 New Standard
O8'o'lalloo
The open parentheseskey. when depressed,
signals the calculator to save ,esults
01 SUbsequent
key depresslons In a special inlernal register.
There
are two such regIsters pel"milling double
nesting 01 parentheses•
Using Parentheses Keys
The calCulator is capable 01 handling two levels of
parentheses which. in combination with the inde-
pendent calcl.llator regIster and memory, allow
very
complex problems \0 be solved elliciently.
Think 01 the lunction 01 ({ a(ld }) in terms 01
internal machIne reg1stelS which are accessed upon
depressIon 01 m.
The close parentheses key. when depressed,
causes the
calculator to execute the key depres-
sions
made rrom the time or the last .depressloll,
The Imermedlate result 01 these operatIons
Is dlsplilyed.
•
The equals- key is used In COIl!unctiol"l with 'he
parontheses keys to linally completS lhO ectuellon.27
';.5 New mun
Nllw data polnls can be added to rhe s\lmmallons
In memory 1l!9lsters and anew mean andstandard
devialfon obtamed.
Exampte: Add \0 the summatIons computed In
tho previous example, the dam polnrS. Find the
newmean and standard devJallof!,
E.IHER DISPLAY CoMMENtS
• ••
COMMENTS
M• ."
Slluldard Oilvlarion
o.
2.
5.
7.
3.
2.
3.'
2.167948339
••
2.
5.
'. 3.
2.
••
••
The display does not c!'lange thereby enabling
repeated depressionso
...... hlch sum a single
dale point 10 the required rlequency.
•Sigma Minus Key
TIlls key Isused to delete summations of adale
point incorrectly entered on as follOws: Keyln
the "x" to be deleled (nOl necessary if already
In display). depress
1. "x" Is sublraclcd 'rom memory one
2. "x2"15 subtracted from memory two
3. Memory three IS decrememed by 1for lhe
nor hem ceun1.
DStandard Devialion Key
~ress.these keys after entering dala points on
• 10 display the standard deviation according
10 the formula:
~~
I
~X2-r.:x)t';'n / m2 rn1
2
+m3
50-\ 0-1 -y m3 1
8. Mean Key
Depress these keys after enlering dala points
on II 10 dIsplay the mean.
~X
,,- --
,
Example: Find the mean and slandard deviation
of the dale points 2, S. 7, 3, 2.
EmER DISPLAY

Sals up
(512)'·(· .. ··;
DISPlJ,'I'
2.234561901
5. }
1.111111111 IS,~.5l'
1234561901
1. 1. (5/• .5)"
~
3 •
38400'/3" 12.&10
6111,549815 2~"t~SJ'
20.25 ,
301,~9291
5Ea
'ionl w,lhOul an IhleNG1\lnll (10$11 P8,entl'\j)s"
kW( aepren'on dUfl"O a(aleul.bon.
Rewnte formula IS d,scussed in BasIC AriltLmelic
Operallons $«I,on:
:
~3~'~'~2~.8OO~:
2 (1 • {slt.5)~1~f2 -2252.73558
•
'.S'
~"
3.
>2800 IilI
Eumple: F,nd the veltlcal sIren ala polol in asoil
wlllch Is 4 51eel ceep and Iocllled 5feet hOlizonla1ly
hom aconceotratOCI surface load of 1'-.800 pou~_
3>< 12.800
Verl,cal Suess - 2': >f{4,5)J II • t~f".5)21~12
13 +1
PCl10rllls
In pallns
I"'el 2.
'.211
E>:eculu In
parens ~12
an(! d,splays
lesu!1. 4.
Tal:es d,splay contell:$,
S, completes pend,ng
01l'l!1I1101'l1n C41CUfalOl'
register. Displays final
resull. 23.
Opens 2nd
levcl parens,
III
DlSpJ.ys conlents.
20. set uD to (l,!t>de
In Ol.lens leYel1.
Opons 111
lev.1 parens
Yes; (5 +2) +(32) =
or 32 +5-+2=
Smce yx Is ,two laclor function l<ey and theretJy
eompletllS apenchno calculauon. the lett most
m.lnod ptrlorrTl$ (5-+2+ 3)'.Olsplay $I\OW$ 100
A1s.o.th'S key seQuence allows no (!quaIs Il.ey
d.pl'$$lon.
No: (ts +2) -+ 3:l) =
Clurs IWllens
~eI2."d
bf'\nll'lnull.
20, to dJSDlay
r&glllel'.
T.kes d'SDlayed result. ".
.tId operales on lnslJ'UCllons
SlOfed In...,.ns Iriell.
d,1p1ays resull ol20~" =S
Rules for Using Parentheses:
leI math symbols represent keys: (indicates
oepresslon,) ioolcales oepressiOn.
No; (S+2){4-2)= Yes: (5-+2)>1.(4-2)=
Ollflator (X (Iepressionl required.
No ~,mpUecl" limes.
No~ 2(5-+3)= Yes: 2x{5+31=
OptralOl (x l;!eprusion) required.
No ",mpl.ed" limes.
ElCtlmple:
28 -[(13 +7) : (6-2)J _ 23
Key in: 28 -t( (( 13 + 7» ..;.. «6
- 2 )) » =. Display shows~ 23.
Reglsler Action
,,-
28 m,nU$
"utruchon In
e.lculatOl'
reg,st'.
No: t ... t..,(... Yes: ( .•. { ... ) .. (.
MIrlOf cood,loon ...-,n occurwl'len ll'lera ale
mOllS lhan \WO opon palenlhos,s key dePles-
ElCample: Solve
25.6' 5,3 - fl2.3 + 8) +(2'" 6.5/.)J
-21.34105882

78.53961634
3.141592654
3.1-41592654
1510196327
Dlsplay/RegiSlar EJrchange Kay
T1>8 x-y iJWaps contenlS oltha dIsplay and
calculalo, 'eglste.s Ills use-d primarily10'
•Reoa.lhl'g \he rad'usor1.. eoDI'dll'lilte aller
llt'PfesslOnot_ or._
• W,th y' ut~;lallO". See IJ3lTl1l1e 1.
fOf $DIY,ng formulae OOnstS:,ng of fractiOfl$.
whose denomln.\Ot$ are surns Of d,fferenc:es.
See example 2
Example I: So~:
~u
5.6.
".
" •••
2.8
To I~or-.:erol
_ra'_1forn
IN(S ,_ 2.1 ><3 3}'"
,.
,.
..,
OISP,",,~
6.28318!:0307
6,283185307
31.4 15926So1
32.91861189
12 _ 1.2
2·3.5
(lIV,""Y
,
5.
3658626t11
2.6L"~·1aL11l31
D1SP\.A1'
"
11.16
3.658626411
II
ENUIl
'. 3
5.
".
•
EKTEIl
••
•
5.
Example 2: SoIYe:
OHEIl
DISPLAY
""," "'"
256.
25.6
5.3 ••
30.9 P'oblem
123.
123
petf""fl'.KI
8 •••
20.3
elil~tl1 as
wroUom,
'.
,.
65.
85
' •.•
21.34105882
5.
5.
•25. "
•25
alii
3.141592654
•78.53981634
Other Keys: II
• PIKey
The •• pi key. display", to ten dec,mal places.
3.14159265-4.
Eumple: Ca!culale Ihe area 01 acircle 01 radrus 5
USIng thllormula. Area _ f~.
ENTal OISPlAY COIJl.IE7fT'$
nilS ploblem may also be perfolfTled;
onEIl DISPLAY
•
•
5.
•
•Two-Pi Key
The. _two-pi key dIsplays 6.283165301.
Example: C8lculale the clrcumh!lence 01 acircle 01
radius 5 us,ng tne IOlfnula; CIrcumference - 2'::"r.

United States
H.C P.S.-c.nl/lll u.s.
po, 8"ll 1000
WUI Jordan. UT &1080'
Overflow and En .
Any I.'uilia/gef Ihan 9.999999 or IndlCatOls
than 1 II 10-19 or logicetrors 999 x ~O" 01 sm.r.
will resuilin the error 1-"; ,'·E,g· clMS,on t¥rlr:<,Q-'
I . , .... cao, florbel .
payed. Touel1l1\O .Will clear h ng d,s-
exceptio lhe case 0' m.~~ I e afleCled 1000lS!Ezl
o ' ....... 1}' overtlow See M
perellO"s. Touching any other k . ~
lInua\Jon of the calculatIOn Wllh th:V c':r:~1s 00l1-
assuming [hatlhe COnlents of the dis t, ... IGf
p-, are~ro
Results and operations Ie$ullin In n
Error indication. 9 a
Results >9999999999 x 10"
ResullS> 1. x 10-"
Division by zero
LOG,LN<O
SIN. COS, TAN ~ 25 revolutions (9000")
TAN 90", 270" tile. TAN of 89.99939999
SlN-I, COS-I> III
SIN-I. COS-1 <'o-so
VX<O
'f' where Y" 0
More tnilSllW'O ({ {( depressions wi!i1Otrt
aII dunng calculation
DMS/D COll'lersjOl'lS > 10
10
Xl where X< Oor> 69
Battery Information
Your calculator i$ powered by rechargeable NiCad
bauorles. illS imperlanl!O charge your ballery fOf
II minimum 013 houl'$ before Inilial use becauseil
Ihe bauerlcs are complelely drained from along
Sio/ago period, uSing Ihe calculator In thIS Slale c:llJ'
permanently damage Iho balleries. The dis;llay Wli
blank when b3ueues need l;:harging. To l;:harge
Ihe Dallery, l;:Onne<:llhe AC charger 10 Ille jack
32
elille lOp or Inc mechlne, AlulleN'<)<l \a1tU Il\1e
hOtlrl and las\$ allprOllimalcly 1M! oou,*. 'l'ou can
~ your fMchlne whil.nle charger Is Plvglle<l '"
!lUlU w,ll c:hsroe IMlI!f II yOI.I lur/\ 11 011 The mlchlne
WIll not ()\'lllc:ha,~e, BE SURE TO 1\JRN YOUR
CALCULATOR OFF BEFORE CONNECl'1NG THE
AC CHARGER.
II your calculalor is lell on for an extend!!d period
oluma, the ballcnes may be chained 10 th4l exla'll
Ihal the C<llc:ulalor w,1l nOI operalo afler being
recrnugeo for II few mtnues. The lllnerles can
usually l>O restor!!d by charg,ng O¥effUght.
Repealed exlenslvo dralntng 01 banel'ltlS causes
permanent damage 10 !)lltleries.
Mailing Instructions
Shoutd )'OUr calculator need Sl!riiClng, pack 'I cale-
hilly In II SIU/ely bo£ for sh,pptn; Proof 01 original
purdlaSe dala musl be eodosed. Be sure 10 ~
your Mrtte end relurn address The p;sc:kage shoUld
be mailed postpaJd 10 the !'lUre$! Na1JOnal $emkOn-
due;tOf serv.ce cen:e/.Il your catculator i:$ returned
lotwarranty repaor$ more than 1Wle:'{ d3)'$ altel' the
onginal purchase data, you must e:roclose lheapPCO-
priate sel'VlU charge (d the 5e!VIee charge d1JT'rlljl
lhf: POST WARRANT'!' panod has beCO d'langed.
Na:,onaJ Sefl\leonduC'Or WIll reqUC$1 you 10 ~
the add,:iOnaI amoun1. if any is neecled. Of mal<e.lhe.
approor;"le relund, ,f there is any d,fference, by cnec;ll:
or money order payeble to Nallonal semiconductor).
Product Service Locations
.".
NS EltcvonlC-l
·.H...... ;p$' .. ••
,.:_ T_
H_II_