Calculo K-80W User manual

INTRODUCTION
Your K-8 0W El ec troni c Calcula tor represP.nts a signifi ca nt e ngin ee ring
achieveme nt resul ting in fulI-size capa bility in a compac t package. Major
advances in rnin ia tur izecJ co mputer c ir c uit s using single-c hip LS I ( La rge
Scale Int egration) have prov ide d a rugged and re li able unit, and the
selI-con taine rJ rechargeable batter y pa ck pe rmit s co nv e nient u se without
need f or AC po wer. An AC ada pter is availa ble fo r AC operation and / or
r ec harging.
The K-80W w i ll perform addition, subtraction, multiplication, and
division functions, including chain or mixed multiplication and divisions,
and utilization of stored constant. Eight digits are provided for entry and
read-out, with ful I- floating or fixed decimal point selection, and positive
or negative sign capability. Additional display indicators denote overflow,
error, a nd negative r es ult (minus sign). A meter indicates battery
condition wh en the unit is in use.
It is suggested that the following instructions for operation be read with
the calculator at hand, and th~t alI calcu lation examples be performed to
in crease your familiarity with the unit .
PREPARATION FOR USE
Battery Power
A rechargeable battery pack is permanently installed in the calculator.
A full charge allows at least 3 hours operating time .
AC Power
Th~ calculator may be operated from any AC 50/60 Hz outlet by using
the AC Adapter. Plug the adapter into a convenient wall receptacle, and
insert the small connecter into the ''DC 6V" socket on the back of the
cal cu lat or.

Battery Recharge
The batteries in the calculator are automatically connected to a
recharging circuit whenever the AC Adapter is in use, regardless of the
position of the calculator power switch.
Wh en operati ng the unit on battery, observe the battery check meter.
Wl1 e r1 th e point er pa sses into th e red area of the sca le the battery shouId
bo r ec l 1c.1rged by l ea ving the unit plugged into th e AC line overnight. A
fu lly discharged battery may take 24 hours to recharge. Nickel-cadmium
cells will not be damaged by moderate over- charging. However, if the
K-80W is to be left unused for more than few days, it is desirable to unplug
the power cord.
'
Warning
Do not store the calculator in high-temperature areas such as the top of
a room heater or the rear package shelf of an automobile exposed to the
sun. Satisfactory operation should be obtained over an ambient tempera-
ture range of O to 50 C (32 to 122F), and relative humidity to 95%. Do
not immerse or allow liquids to fall on the unit.

CONTROLS & INDICATORS
Power and "K'' Switch
De c imal Switch
[£]Key
@]Key
[I]Key
8=JKey
I;tJ Key
~ Key
[-·=I Key
QKey
[Q]-l~ Keys
Overflow Indicator
Minus Sign Indicator
'
Error Indic ator
Turn s ca lc ulator power " ON'' & "O F F'' . S lidP.
swit cl1 with 3 po s iti on s; in the top pos ition, th e
"K" opera ti on is in e ff ec t. Use of " K" a ll ows a
nu, n t> er to be e nt er ec l a nd 1e tc:1in ed as 1:1 "co n-
sta nt' ' for se r ies multipli ca ti on or divi sion.
Three - position slide switch selects number of
decimal positions in answer. "AUTO" places
decimal in appropriate position required by
calculation. ''2'' and ''3'' provide fixed decimal
answers, with automatic round -off of additional
decimal digits. When the next digit is O- 4, the
last displayed digit is not changed. When the
next digit is 5 - 9, the last displ ayed digit is
in cr eas ed by 1.
Clears th e calc ulator a nd the display of all
numbers.
Clears last entry ( Error correction)
Ent e rs a ''multiply" command .
Enters a "divide'' command.
.
Adds the entered number, or
a prev iously entered ''mu ltiply''
command.
carries out
or "divide''
Reverse setting of figures from Negative to
Positive or vice versa.
Adds a mi nus sign to an entry. Subtracts the
entered number or completes a previously
entered ''multiply'' or ''d ivide '' command.
Enters a decimal point.
Enters digits of a number (l imit -8 digits).
Indicates a calculation result that co ntains
more than eight digits.
Appears as Iu I
-----------~
Activated by the! - - I Key for operations with
negative numbers .
Indicates an entry of more than 8 digits.
Appears as .... l[ _________ _.!

•
CALCULATIONS
1. ADDITION
EXAMPLE : TO CALCULATE 16 +9+8 .3 +4 .1 =
DO THE SE STEPS
DISPLAY WILL BE
a. TOUCH @J ------- ---
I
b. ENTER 16 --- ---- ----
I
c. TOUCH CiJ --- -- --- ---
I
d. ENTER 9 -- ----- -----
I
e. TOUCH rn- -- ---- ----
I
f. ENTER 8.3 - --- ---- ---
--I
g. TOUC HI IJ
--- -----
[
h. EN TER 4.1 -
i. TOUCH rn -
- ,-
-I
-- ANSWER
L _- -
2. SUBTRACTION
EXAMPLE # 1: TO CALCULA TE 1 2.8 1 - 3.6 =
0.
I
16. I
16. I
9.
:
25.
8.3
33 .3
-4. 1 I
-
37 ~ 4]
DO THESE STEPS DISPLAY WI LL BE
-
a. TOUCH m---------1 ___ ___ :_ o_. __,I
b. E NT ER 12.81 I 12-~
c. TOUCH l1] ,_, ----- 1 -2- .8--.11 .
cJ. E NT ER 3.6 - - - - l .__ ___ __ _3_.6 __, · I
e. TOU CHI ·=1- -- A NS WE R L.____ __ _ ---=9'-- .2 __, 1)
EXAMPLE # 2: TO CA LCUL ATE 23 - 6 + 2 .1 - 5 ==
DO THESE STEPS DISPLAY WI LL BE
a.
TOUCH ~ I
0.
I
b. ENTER 23
I
23.
I
C. TOUCH[I}
I
23.
I
d. ENTER 6. I 6. I
e. TOUCH [-= ! I 17. I
f.
ENTER 2 .1
I : 2.1 I
g. TOUCHW
I 19.1 1
h. ENTER 5 I 5. I
.
TOUCH 1--j
ANSWER
I 14.1 I
I.
EXAMPLE # 3: TO CALCULATE 62 - 82 + 10 - 40 =
DO THESE STEPS DISPLAY WI LL BE
. - -
a.
TOUCH [TI
I
0.
l .
b. ENTER 62
I 62. I
-
C. TOUCH (I]
I 62. I
d.
ENTER 82
I 82. I
e.
TOUCH l- -, I-
20 . i
f.
ENTER 10
I 10. I
g.
TOUCH(]
I-
10. I
h. ENTER 40
I
40.
I
TOUCH! - =::I
I
.
I-
50 .
I•

3.
4.
REVERSE SETTING I+/-)
EXAMPLE :
TO CALCULATE 62 - 82 = -20,
Reverse setting I +/-:I
~2 0 = +2 0 + 30 =
DO THESE STEPS
DISPLAY WILL BE
TOU CH [ ._ ~ l
C"
a. --·-
0. I
---
'.. .
b.
E NT ER 62 [
___ --- ·-·
62. I
-.
C.
ToycH W I 6~_
=i
I
·-
d.
E NT ER 82 - - - · s2. J
--.-
---·--
e.
TOUCH f - 1
I-
20. I
f.
TOUCH !+/ -] I 20. I
g.
TOUCHII)
I 20. I
h.
ENTER 30
I 30. I
•
,.
TOUCH~ ANSWER I
50.
I
MULTIPLICATION
EXAMPLE # 1: TO CALCULATE 29.32 x 56.5 =
DO TH ESE STEPS D
ISPLAY WILL BE
a. TOUCH W - - - --- -- -- ._I ___ __ o. _____. l
b. ENTER 29.32 ._I ___ __ 2_ 9_.3 _____ 2)
C. TOUCH [8J ...... 1 _ ____ 2_ 9._3_2 l
d. ENTER 56.5 I 56.5 j
~===========
e. TOUCH rn-- -- ANSWER ~I _ __ _1_6_5_6._5 ___ 81
EXAMPLE # 2: TO CALCULATE 3 x 21 x 6.1 =
DO THESE STEPS
a. TOUCH ITJ-- ---------
b. ENTER 3 ---- -- - -- ---
c. TOUCH [8]--- ---- -- --
d. ENTER 21 ---------- -
e. TOUCH [8J ---- --- - -- --
f. ENTER 6.1 - ----------
--
g. TOUCH l1] ---- ANSWER
EXAMPLE #3: TO CALCULATE 13 x 6 =
USE OF 'K' SWITCH 31 x 8.2 =
DISPLAY WI LL BE
I 0.
I 3.
I 3.
I 21.
I
63 .
I.
6.1
I 384.3
31 X 7.6 =
DO THESE STEPS
DISPLAY WILL BE
a. TOUCH IT] -- - - ---- - --
I 0. I
b. PUSH POWER SWITCH TO ''K'' -- --
I 0. ]
c. ENTER 31- -- --- ---- -I 31. I
d. TOUCH (RI - - ---- --- --
I 31. ·1
e. ENTER 6 --- - ---- ----
I 6. I
f. TOUCH rn-- -- 1st ANSWER I 186. I
g. ENTER 8.2 - --- ---- - --
I
8.2
I
h. TOUCH (!J -- -- 2nd ANSWER [
254.2
I
i. ENTER 7 .6 --- --- -----
I 7.6 I
j. TOUCHrn ----3 rd ANSWER
I
235.6 I
k. PUSH 'K' OFF (POWER SWITCH "ON")
I
I
I
I
I
I
I

5. DIVISION
•
EXAMPLE # 1: TO CALCULATE 376 -:- 53 =
DO THESE STEPS DISPLAY WI LL BE
a. TOUCH w -- --------1 0. I
b. ENTER 376 --- ----- -- I 376. I
c.
TOUCH El
-- - ---- --! 376. 7
d. ENTER 53
· --------! 53. l
e.
TOUCHII) ANSWER
1 1 .0943396 J
EXAMPLE #2: TO CALCULATE 81-.;... 3 7 9 =
DO THESE STEPS
DISPLAY WILL BE
--
a.
TOUCH re- ] I 0. I
l ,.
E NT ER 81 - --L :a1. l
-c· -
-- - J
c.
TOUCH GJ
81.
-
--
d.
ENTER 3 I 3. l
e.
TOUCHG]
I
27.
I
f.
ENTER 9 I
9.
I
g.
TOUCH [] ANSWER
I 3. I
EXAMPLE #3: TO CALCULATE 181 ..;.. 15 =
USE OF I K' SWITCH 96 ...:.. 15 =
•
117 .:. 15 =
•
DO THE SE STEPS DISPLAY WI LL BE
- ---
a. TOUCH W -:--·--- · -· - - --- I 0.
b. PUSH POWER SW ITCH TO" K'' I
~ === =========~
0.
c. ENTER 181 I
::::= ========= === ===:
181.
d. TOUCH E] ~I ___ _1_8_1. __,
e. ENTER 15 [ 15.
:=::============= ===:
f. TOUCH [!] ---- 1st ANSWER := I ====== 12= ·=06=6=6 = 66 ===:
g. ENTER 96 ._I ___ _..; 9 ;c._;; 6~. __,
h. TOUCH !!) --- - 2nd ANSWER IL-._ _ _ ___ 6_ .4 __, ]
i. ENTER 117 - - --
- - - - -1 11 1. I
1
~====== ====== ~1
. 7.8
j. TOUCH [!j -- - 3rd ANSWER
k. PUSH 'K' OFF (POWER SWITCH ''ON")
6. MIXED ARITHMETIC
EXAMPLE #1: TO CALCULATE 23 x (-4) _:_ (-6) =
•
DO THESE STEPS DISPLAY WI LL READ
a. TOUCH W ---- --- - -- 1 0. I
b. ENTER 23 I 23 . I
c. TOUCH [Kj j 23. I
d. ENTER 4 I 4. I
e. TOUCH !- =/ J 92. J
f. TOUCH G) I 92. ]
g. ENTER 6 j 6. I
h. TOUCH !- I I 15. 333333 I

EXAMPLE # 2: TO CALCULATE (g + 6 -5) x 8 - 8 =
20
. DO THE SE STEPS DI
SP LAY WI LL BE
a.
TOU CH CT]
I
0.
I
b. E
NT ER 9 I
9.
I
c.
TOUC H !}" j I
9.
I
(i. NTER 6 6. I
J
-·-
TOUC HIT] I
e. 15.
f. EN
TER 5 5. I
g.
TO UCH ( =I
10.
I
h.
TOU CH [8J
I
10.
I
.
ENT ER 8 I 8. I I•
.
TOUCH [±]-
I
80 . I
J.
k.
E NT ER 20 I
20 . I
I. TO UCHI]] I 4. I
m. EN TER 8 I
8.
I
n.
TOUC H □
ANSWER I- 4. I
7. EXPONENTS
EX AMPLE #1: TO CALCUL ATE (3)5 =
DO TH ESE STEPS
DISPLAY WI LL BE
a.
TOUCH IT]
I 0. I
b. PUSH POWER
SWITCH TO'' K" I 0. l
C.
ENTER 3 I 3. I
d.
TOU CH IKJ
I 3. I
TOUCH II] I I
e. 9.
•
f.
TOUCH II] [
__
27.
I
g.
TOUCH (IJ
I 81. I
h. TOUCH II] ANSWER I:
243 . I
. PUSH '
K' OFF (POWER SWITCH ''ON'')
I.
EXAMPLE #2: TO CALCULATE 6 EJ (3)3 =
DO THE SE STEPS
DISPLAY WI LL BE
a.
TOUCH CTJ
I 0. I
b. PUSH POWER SWITCH TO ''K''
' I
0.
I
c. ENTER
6 I 6. I
d. TOUCH
EJ
I
6.
I
e.
ENTER 3 I 3. l
f.
TOUCH II] I
2.
I
g.
TOUCH W I 0.
6666666
I
•
h.
TOUCH (I] ANSWER
I
0.2222222
I
. PUSH
'K' OFF (POWER SWITCH ''ON'') I.

OPERATION OUTLINE
(REFER TO INSTRUCTION MANUAL FOR COMPLETE INFORMATION)
BATTERIES
POWER
DECIMAL
RECHARGEABLE BATTERY PACK INSTALLED.
SLIDE POWER SWITCH TO ''ON''. DO NOT MOVE TO
''K'' (CONSTANT) POSITION UNLESS REQUIRED FOR
CALCULATIONS. WHE~ AC ADAPTER IS USED, RE -
CHARGEABLE BATTERIES WILL CHARGE EVEN WHEN
POWER SWITCH IS ''OFF''.
SET TO ''AUTO'' FOR FLOATING DECIMAL.
SET TO ''2'' I.E. 4.555 ➔ 4.56 0R 4.544 ➔ 4.54
.
SET TO ''3'' I.E. 4.5555 ➔ 4.556 0R 4.5551\ ➔ 4.555.
INDICATO · Rs [ SHOWS iNPUT EXCEEDS IJ DIGITS. CALCULATIONS
- MAY PROCEED USING 8 MOST - SIGN I Fl CANT DIGITS.
u SHOWS RESULT EXCEEDS 8 DIGITS. CALCULATION
STOPPED, ANO ANSWER CORRECT WHEN DECIMAL
MOVED 8 PLACES · ro RIGHT OF DISPLAYED
POSITION.
METER -WHEN POINTER STAYS IN RED ZONE, RE-
CHARGE BATTERIES, OR USE AC ADAPTER.
CALCULATIONS ALWAYS BEGIN BY PUSHING (CJ
IF MISTAKE IS MADE IN ENTRY, [CE] KEY WI LL CLEAR
ENTRY BUT NOT ACCUMULATOR .
A+B=X ENTER A, I§; ENTER B, [EJ; READ X.
A-B=X ENTER A, [B; ENTER B, E§l; READ X.
AxB=X ENTER A, OO; ENTER B, [El; READ X.
(-A)xB=X ENTER A, l+/-!r8]; ENTER B, l+=J; READ X.
Ax(-B)=X ENTER A, OO; ENTER B,l!Bf§; READ
A7 8=X ENTER A, ffi; ENTER B, [B; READ X.
USING CONSTANT (POWER SWITCH AT ''K'')
KxA=X ENTER K, IX]; ENTER A, IE]; READ X.
KxB=Y ENTER B, IE; READY.
KxC=Z ENTER C, [±§]; READ Z.
A3 =X ENTER A, I!]; [El, [B; READ X.
A7K=X ENTER A, ffl; ENTER K, IE; READ X.
B7 K=Y ENTER B, [§; READY.
C7 K=Z ENTER C, lB; READ Z.
I / A=X ENTER A, G; ~, [E]; READ X.