Heathkit IC-2108 User manual

PrICe $2.00
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Operation Manual
for the
MODEL IC-2108
ELECTRONIC DESK-TOP
CALCULATOR
HEATH COMPANY
BENTON HARBOR, MICHIGAN .8022

TABLE OF CONTENTS
IntroductJon .3
.4
••
· 7
1
••
••
••
,.
11
12
13
"
15
"
•
•
•
•
a-nl .... "..., ...
Owt t: 1 - AdClhar,
o.n"'2 -SubtJxtian
o.t $:3 -""" bplw.:.tIOft
Owt 44 - D",_ . . .
Ctw1 ~ - "" ....d CeIcu~uat" I., s._
a.rt d - Ml.ltbptyu .. by •ConItwtt •
a..t .7 -DllIong by. ConIUnt
a..t .a - Ra$ni. NumbIr 10' Poww
Q\Irt .e"- RaoIII'I8' ~ 10. ~ USIng ConNnt
Q\Irt d - CllauIMl". Ntgrb ... e ~ of Nwn... . . •
o.td"-~Rclpl'llclh .
a..t Ifl0 -1JNnCI1tMI CD K.y to REnonaaus ~
--
•17
flllid o.c...t
..• • • • • "
21
Reofw .... T ....
72
•

INTRODUCTION
Thil .............. N -.eos-.tIOr'lofYOloll'~IOf. Ta •• '- .......
~ r_ tht ...,.... Md~,.. you bicu •• ~ .. WIth 'fO'IT wt'lJt.
You c.1 ..,idtty Ind ~lIty add. aIbtnct. _1tJIIty. MIl: crr.. In ... ..,.
an","f ... _d ~. In fac1 YGl ".., M:/IOn U. your CaIr;uIMDt for PI .. , >.11'1
__ you lid not ongjnIIly CIOf1Iidw. Common ......... ~ .. PtCI\'tCled
for ..,k* A'f~. you ...-d thin\.

...
OPERATING FEATURES
F ..... 1 po,tta OUt IN OIMntinlll ,..... ,. of 1M ~. Uctt '.tunI II
dIIcr1bed t*ow;
1. POWER SWITCH -r ........ thI 0dcI.I,,* on and off.
2. S.OIGIT READOUT -Dbpa.ys the I"Im1tlen In thI c:ab.itltion ~
bctI dIGit _lion " CIpIbIt of dltplrtin9 IIoIl'l'IbIr1 0 Ihnlu-, 8 -:I I
~IPOl"t.
3. NEGATIVE NUMBER t~OtCATOR - l.¥ID I-I to 1,*,'I'''''u-..
m_.
... OVER RANGE INDICATOR - lJI;\a wIwIlht ~ OfIkrty of
1M c.k:vUtof h-. t.... .c-'-l. S.lhee:twt on'" 18.
5. DECIMAL POINT - I~ 1M klcation of 1M dtclFNll point in thI
nr"m. If10wn on 1M READOUT.
6. DECIMAL PaIHT SWITCH -s.c: •• l:hIr. fuud Of. f1D11ton1 ......
POOttt 1l't*\IOn In m. ~ The feud poWon /I ~1Nd wIwI ytIU
won the uno\. ThI IflOltlngl pcIIllJon P'mWb 1M UNt to 8U""""'tic;alty
pa- "" dKOI'''' poHn WhIr. It ...... 11 ,ndudI tht mott 1'll .... 'Q!'I"t MII'I'lben.
ReI. 10 p ... 21 In tho, M.nu.II lor lvrm. fOfmltJOn on ' .. lId ~
poeM ot*lbOn.
7. IKI CONSTANT SWITCH -Thil ,whdl _illlIP' In """ltl~tJOn or
dlYWon -..... CGl'lIUl'll nutI'ItMr II~ u.s, by not: ,., • .,..lNt IN
oomtanllUT'b« bI ~ tid'! tiIM.ISM hgiIIl0end 11.1
a. lel C1.EAR KEY - PuIh m" k.., 10 dW ... I'UtltMn In IN c.aeu"'1Of
Ind ,_It to Z~.
9. {Col CLEAR DISPLAY KEY - ~ 1tl1l k.., to d_ Itt II ..........'kl'y
MU'Y to N00111I« t'aIl'l'lbw Of futlctlon CIn bI .., ... 'The Co It..,. woll
not: dlAlJrb ... ~t of .. optntHM1 in rtoI'I9I ot.n- on Iht ~
10. NU BER ENTRY KEYBOARD - UN U- k..,. 10 IInW numbln Into
tnt Ctlc:ulMot.
11. I-I SUBTRACTION KEY - 1'\I1Ih ttl. key blfcn '(01.1 '"'*'. ftUf'l\Otr to
bewtJU'ktad fTOf'II an alI.~ nu .... '" the CakulilOf.
12. 1~1 DIVISION KEY - P\I1h dill by befoN yCI.I an_ a,.,rNHr 10 be
d .... idId Into an DIS!,,,'--lr'I1tIeCalaltilllDf.
13. ttl ADDITION KEY - P'\IIh ttl" k.... Mi'on you en .. I numblr 10 tit
IOMd to WI ... ung I'lUII'lblr In tIM ClkWllOf.
14. (XI MULTIPLICATION KEY - PuIh din k .... t.foR YOI.i an .. 1"",,",,*
to bIIIftl1li9111d by an oillinllWolmDw In 1tlI CIIloJtItor.
1S.
(-) EDUALS lTDTAU KEY - ...... h VIii by 10 ,*"",1'1II111 c:ale\.llIItion
and ... tt. rtalltJI'lI __ on 1M A EADOUT.

• C
• CD
(lIU In
C.l"
IIHlU
.,.
10
F.."..,
.....

.....
OPERATING PROCEDURE
a-u .. """" 10 hiIIp you bcoi,. bn\1 .. with "Clkut.tDr. 0IInI I
n~ 4, ~ folboot. iIluwt_ '1M four t.oc functions of n c.kulttor:
ADDITION. SUBTRACTION. MULTIPLICATtON. and DIVISION. a.t 6
__ millie! ak:ulltloN; 0w1:I 8 1M 1 thOIII' lI'II.lIuplkldon MCl dw""", by.
conItarot; 0wtJ 8lind g thow how to c:lku1tUl potItlV'I tnd M!l"tN. POWWI of
runMn; Owt 10 1howI1h.1.III of h (CDI CLEAR DISPLAY.
A ample en., kincluded ,,"1 to thorN 1C1LI" r_doIol1 •. 1"-~. In fI~ 1
-S J .. omitted from hfunction c:Nr1L
&eft I'lUmbIAd step (line' of tht OwtIlhows .... tllcn w.p.,11nd ful"ClJOO It.,.. to
PlIIh, InC! what 1M """t 'Mil be. U. WI. flc.1""1 dKl~ modl for "I the
......
CofwMct the Uno! tQ an ~pn." AC pcI'lIIIW -.ource. Th" "Ppfi .. _ ~
ID thI drOollt to gIyt Inwnt-ort oper1ltion 'tIItt«l tht ~ SWlteh I, tum«f on. II
the UM ..... "-' dbtoo. ...... .-d for IOl'nt time, It /Ny'" up to 30 *OnCk fOf
the clapI.y to Jlltlt In. dtmIy ht .....
Befor. yOl,l big.,.. any ulcvlMlCn, It is fOOd prxtlce 10 push Ut. leI CLEAR It ....
to tMt ttM CMc:ulltor.
SAMPLE CHART
READOUT CHARACTERISTtcS
CONSTANT SWITCH: OFF
STEP INPUT FUNCTION READOUT
1[[t
[J[[I~
I
0. 101
ZERO PRECEDES
fRACTIONAL NUMBERS
7
f!:I I
o. II
(DECIMAL fLOATS)
3
~[illrm
I
0.521
lO.l STOREDI
•
[t1l
I
0.621 .

CHART.1 -ADDITION
ADD:
, ... ,
..... CONSTANT SWITot: OFF
, ....
ST"
I ... UT
FUNCTION READOUT
I[[I[[iriri!:l!I[O[ill ~I
155. n
2
[llj~[EJ[llJ
~I
18 G.l.fl
CHART" 2 - SUBTRACTION
SUBTRACT: ,
.....
-41.22 CONSTANT
SWITot: OFF
... "
ST"
INPUT
FUNCTION READOUT
1
~[llJ~[IDj[lJ~[Ul
~
I
10 8. l.f 81
2
~IDJrJill[llJ
l[I
I
60261

.....
CHART ~3MULTIPLlCATION
MUL.TIfILY: m
..!!...!.
CONSTANT SWITCH: OFF
.,.
STEP
INPUT
FUNCTION READOUT
1
rs
[[J[llJriJ
~
I2251
2~ ~ [
fj 751
CHART #4 - DIVISION
DIVIDE:
.......... -111
CONSTANT SWITCH: OFF
STEP
INPUT
FUNCTION READOUT
I~
~[t:J[C:1
lEI
I44
Lf.[
2[B ~III
1.1

CHART ,,5 -MIXED CALCULATIONS IN SERIES
AOO.sueT~ACT.ADO.MULTWLY.AND
DJVlOE IN SEftlES:
COHSTAHT SWllDt: Off
•
lt5+20-'·111 .....
•
STE'
INPUT
FUNCTION .UOOUT
,
[llJ
lliJ[!J
[l:J
I
/5.1
,
rmra
a;) I
351
,
[!J
[I:J
I
30.1
•
lliJrm rt:l
I
Lf 2.1
•
[l:J
lI:J
I3351
•
r!!I
[B B
Lf.
·NOTE: ...... t.onMd.? .. llICNi 04 ........... ".".. ..........
"'rwtoflNpi:l' .-'. t.
.....

"'0
CHART'-6 -MULTIPLYING BY ACONSTANT
WHERE CONSTANT Ie -X3
CONSTANT SWITCH; Ie
2"
S
8 K- 24
40 K-l20
m,
INPUT
FUNCTION READOUT
!t
1W
!l!J ~
I
21
2
+l1!I
~
I
51
3
l!J
[B
I
241
•
ll!I~ ~
I
/201
•
=1
·NOTE THAT THE CONSTANT IS THE SECOhO NUt.l8EA ENTERED.

...."
CHART if7 - DIVIDING BV ACONSTANT
WHERECONSlANT It-
COfrlISTANT smTCH: It
12 K-J
2OK-S
28K"7
STEP
''''tJT
FUNCTION
.fADOUT
.....
fiII[llI
[i:J
II
21
1
~ """I
2
'EJ
[J
I 3·1
3
[lllm
~I
5.1
•
:Will
[[1
I
7.1
•
=1
°NOTE THAT THE ~STAHT IS THE $lCOND ~U"'BER E~T[AED.

CHART .,. -RAISING ANUMBER TO A POWER
RAISE' TO ITS FOURTH POWER:
CONSTAHT SWITCH: OFF
.. · •• '.'.11·4_
STEr INPUT
FUNCTION READOUT
1
EI
It!J ~ I
al
,
~
~I6
Lf!
,
[I!J
il:J
I5
/21
•
[I!J
[S I
Lf 0 951

CHART "A RAISING ANUMBER TO A POWER USING THE CONSTANT
RAlSE. TO ITS FOURTH !'OWER: CONSTANT SW1TCH: ON
.. ·.1I.1I.x.-408e
STEP
INNT
FU'-'CT~ tliUDOUT
1ill]
~
[;jI
~
~
2I5
Lf·1
J
~
15
/2·1
•
[[jJ
1
Lf 0 95.1
.... "

.... "
CHART 49 -CALCULATING NEGATIVE POWERS OF NUMBERS
CALCULATE: nilE NEGATIVE fOURTH POWER Of 2:
CON$TAHT $W1TCH; OFf
11
,~.-. -1.;.2.;.-2-2.;.2-
"''''
2' 2.2 .. 2.2
ITE,
INPUT
f~CTION READOUT
1
~
]J
EI
/·1
,
[ill]
~
I
0.51
3
[[1
~ I
0.251
•
[[1
~Io /251
•ill
1:]
I006251

CHART #9A CALCULATING RECIPROCALS
CALCULATE: 1
CONSTANT $WITCH: ON
X
X- .015625 tON DlsPLAYI
l.-s.t
X
STEP INPUT FUNCTION
AEADOUT
•
@J
I0.0/55251
1
81
2~1
/·1
J~I5
l.(.1
•
;1
...."

CHART .10 -USING THE CD KEY TO REMOVE AN ERRONEOUS INPUT
MULT"LY, _TRACT, AND DrvlDE
IPllIE.'U(S,
COfif$TAHT SWITCH: OFf
o fSxl0 -21_13
J
ITE,
''PUT
fUNCTION fIlEADOUT
1
I~
ill
~I
51
~
,
~~
B1
I
5a1
~
J
ER"OR
[llJ~
I-
e 0.1
•
CLEAR DISI'LAY ~"'a I
50.1
~
•
[illJ~
~
I
39.1
•
~ ~
I
/31
""""rJlClIbOn ..... 1M .... m. ~11 be torl'4*-.t Mfon Iht
oONOTE; flP'CtlCln ~-.:l onfy foralbncbOn.
O~TE: The
.....of _PI :tllm II wortItd OIJL

=
OPERATING CONSIDERATIONS
OPERATING TEMPERATURE
1M lOI,d~w. delIn In 1tle CIbllltof .. ~ to (lpInte l'Illl'mdy It
... ptntUNi blt\t<w. 10 Ind 40 dtgrMs <Ant9D 160 to 104 __
FIh,.. ....II. If you ~. the elk:ul,uor In ...... ...,. outIIde of 1his ,....
yo.I m-v tntOUnnr INCltUJaUI oplndon.
NEGA liVE NUMBERS
~iv. flI,/!T'b«'I un be uMd in "''1' UJcuIa\l~ To _tab!1$h •negll.....
""mber, pwh ltIe 1-) key Immtd~ItlV btfor. yw enur 1M 11l,Inm..
DECIMAL PLACES
Tht location of m. dec>mtl point In the __ ilMtby tM DECIMAL POINT
JWiu:h. For I'Clmplt. with •DECIMAL POINT Maine of o. bolt! of ttM
foIlow1,. MtditlOnt would be shown on the f"Mldout .. 33.
In ~latior. ....... m. _. lndudlt'l9 .ny l'lUfTltNn to .,. ~t of N
_11'I\II1 poln!., D;~ tiftlt digiti. oNy the f",1t ~1 digiti of tM.,... wilt
be dhpl.yed. FIX blftl9l'. in m. foaowing Idd,tiotl WIth •DECIMAL POINT
IIttltlg of 3. 1ht AEADOUT woukl !how 1M _ .. 14208.650. If ttl •• UIM
probltm _. _bd out WIth •dlC-ll'Nll point 1II1tJI'lg of c, lht. W\Witf would
lUll be ttM Am'llfn 1M <:aku1Mot will not cut off th, "'" '1m. lett (mort
wgnlflc.ant numblrlto dll!P"V 1M "6" It the '9'1 lI_c\ lignlf~t numberl.
68436819
(t) 7382.9587
~"~,~",~.",,,!9i:_-- NOT SHOWN
a.OIGIT DISPLAY
'A)
10
It) 17
33
'0'
18.5963
(t) 11.102"
33JI987
"'th Iftl»tl11ll DECIMAL POINT Mltlne. only N ~ .... rfk,.,1 digit lwhttlrl
1M
8-dtoIt QClkity of 1M CDIIlDtl to the rll;\t of NItItIn'llll point 151how¥n.
Sine- ''S'. hthe _t 5igNrant ditit In 1tlt ....,. to ltMI tdditJOn ~e, Iht
...- d1tCl1..,.c1 would be 14201Ui5.
To 1M the full _fOf 8dd'11on IBI. you would haW lI:I U. In. F lfloltlngj
IIIUlnll ..
It. dw1I:tIJ1JtJC of 1tlt C4IkuIator II Nt ...,., hcUontI number It .. --,.
Pi iiC«*I tw a (zwol or. whoM nurNMr. Th .. thtrW:1aiftic 11m,g the \nfIut Mel
~t ~ity of ltMI Clkut.1Of U) ..." c1gju to the rieht of 1ht declmtl
polnt

.... ,.
OVERRANGE
The OVERRAAGE INDICATOR" tIM: ~t end of the READOUT ".fI1 Il{ltlt
...n-o tht ~numblr Inw~ or flNl ....- to Icakulttion 11 Wyand the
&dtgot elllptCity of the Cak:I.lll=r. 11'1 ., cw.r .. tondltion. ttl. p.-t of the
amwlIl' IhO'Wn WIll 1M eorTltt. bUt tIM: ~ poltIt w, t 1M .'It!t ~ to tIM:
Nft GIlts comlClloution and VI. Plrl of the _ brtOf'd"'1 d.gou Woll not
........
To .hmirwt• .., OVtnlngttond.,klrl '(OU Iftln pr-. th.le) CLEAR k..,.
OVERRANGE INDICATIONS CHART
COMBINATION
INITIAL RESULT ENTRV AND
EXCESS ENTRY OF OPERATION OPERATION
.......
[U
[j
-E0
fj
CAUTION: A,.,.,...,.I NIt,"Y r .. ,..1hIt~ in 1h<I O¥..,. .. condltlon
6nlhc:It_ b ~bIl1fy of an wnw' _ U'l0l0l1tl the ditfQy it con1C1.
ENDING A CALCULATION
~ you h .... tompktm IU "'Puts for •C8lallI1lon. pultl .,. I-I EQUALS
k..,. 'Thos d •• vs the __ Ind Jnl*ft the CMala.tor for «l1fY of the hnt
r-.lmo- of th<t next e.k:lllttlon wi1tlout MYK'It to push tIM lei CLEAR by.
SUBTOTA.lING
In _i. Cllk::ulttoonl, VOU Qn puth 1M I-I EQUALS kr, to d\lP&ly. IUbtotal.
To (Otltinut with the alcUlttfOf\ you mult pull'! •function hv It. - •• ,or +1
blfor. WlI.i...,1he nat l'N1tbet.