TCA 420 Instruction Manual

OPERATING Model
420
INSTRUCTION
440
MANUAL
CTCA ~)
ELECTRONIC CALCULATOR

FEATURES
o Fast, qu i et printing up to 12 digits plus decimal point, and two symbols;
display 12 digits plus one symbol.
o
Independent, addressable 6 key memory
o Automatic constants in all four functions
o
Percent add on/discount (separate register)
o
Pun ctuation (separation of numbers)
o Add-mode
with over-ride
o One
touch grand total operation
o Bright easy to read display
o Double Item
Counter, counts up to 999 entries
o N
on Print
o Roll-over keyboard with 8 digit Buffer Register
o Paper release

CONTENTS
FE AT URE S.
I
KEyBOARD .. . . .. ... .. . .. .. ... . ....... .. . ..... . . ... ... . .. . . . . . 3
SPECIFICATIONS . . . .. . ............. . ........... .. .... .. . . ... . . 4
E XPLANA TI ON . .. .... .. . .... . . .. . .. . . .. . .. ... . . . .. . . ..... ... . . 5
RIBBON CHANG E . . .. . ..... . .. .. . .. . . ..... . ..... . ... . ... . .. ... . 7
PAPER CHANG E . . .. . ........ . . .... ....... . ....... . ..... . ... .. . 8
OPERA T ING EXAMPLES .. . . ....... . .... .. . . .. . .. . .. . . . . . .. .... . 9
6) Percentage Calculation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. '2
7) Memory Calculation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ' 3
I) Addition and Subtraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 9
2) Multipli ca tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
J) Divisio n. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. II
4) Mix ed Calcula ti ons ..... . ...... .. . . .. .. .. .. . . .... . .. . ...... II
S) Accumulation Ca lc ulation .... . . . ................ . . .... . .. ... 12
8) Invo
ic e Application . . ...... . . . . . .. . .. .... . . .. ...... .. . . . .. . 14
9) Cro ss Footing Applicatio n. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15
10) Percentage Di stribution Application .. ... .. ..... . .. . . . . .. .. . . .. 16
11 ) Percentage of Increase or Decr ease Application . . . ... . .. . .. . .. .. . 16
12) Payroll Application .. ... . . : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2

1 };~~ ~ t==
~
, f6\
L- ____________ 29
l D------------------~
1a ------------------- L------------ - ( 30l
1. Paper Release
2. R
ound Of f Selector
3. Decimal Sele
ctor
4. Me mory Li ght
5. Negati ve Indica tor
6. Overflow Indica tor
7. Feed Key
8.
Item Cou nt er Key
(420 only)
Grand Total
Ke y
(440 only)
9. Clear A ll Key
10.
Cl ear Key
11. Clear E ntry Key
12. Numeral Keys
13. Decimal Key
14. Addition K
ey
15 . S ubtract io n Key
16.
Total K ey
17. Non Add/Sub-Total
Key
18.
Me mory Mi nus Key
19. Non Print Key
20.
Pe rcentage Key
21. Print Key
22.
Me mory Total Key
23. M
emory Sub-Total
Key
24.
Me mory Min us Equal
Key
25.
Me mory Pl us Equal
K
ey
26. Equal Plus Key
27. Division Key
28. Multiplication Key
29. Equal Key
30.
Me mory Pl us Key
3

SPECIFICATIONS
1. CAPACITY:
Entry .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . .... . . . 12
digits
Addition
and Subtraction ... . .. . . . . .. .. ..... ..... . . .. ..... . . 12 digits
M
ul tiplication :
Multip
li er ... .. . .. . . ... . .. .. . . ... . . .. . . . ..... .. .. . ... .
12 digits
M
ul tipli can d. . . . . . . . . . . . . . . . . . . . . . . . . .. . . ... . .
12 digits
Pr oduc t ....... . .. . . . .. ... . .. .. .. . ... .. . . . . . . .. . . .. . . .
12 digits
Division:
Div
is or ...... . .. . . . . ... . . 12 digits
Divid
en d . . . . ... . .. . . . . 12 digits
Qu
otie nt . .... . .. . .. ...... .. . . 12 digits
Ac cum ul ator .. .. . ... . 12 digits
Max imum De c imals. 12 digits
2. PRINTING:
Nu mber of print c ha ra cter s:
(
12 numer als. 1 decimal point and 2 symhols)
Spe ed: 2.5 lines pe r se co nd
Pap er: Standard ro ll pape r
Wi
dt h ... . ... . .. ... .. . . . .. .... . .. . .. . 2
l/ 4"
Dia me ter . ... . . . ...... . .. . .. .. ... . . ..... .... . . . . . . 2 .l!4"
Ribb on: 2·color (B lack and Re dl
W idth .. . .. . . . . . . . . ..... .. . . .... .. . .... . . . . . · . . . . 1/ 2"
Length .. . .. . . . .. . .. . . . . 210"
Ribb on S po ol ... . .. .. . ... .... . .. ..... . . .. . . ... . .. .
Sta n da rd TY re
3. COMPONENTS:
LSI
4. VOLTAGE:
AC I 17V SO /60 HZ
S. POWER CONSUMPTION:
J8W
6. SERVICE TEMPERATURE:
32 .0 F· 104 .0
oF
7. DIMENSIONS:
9- 1 /8 "(W)X 14.0·'(L IX 3-1/ 8(H)
8. WE IGHT:
7 Ibs.
4

KEY EXPLANATION
1. DECIMAL SELE C TOR
Settings F, A, 0, 1, 2, 3, 4, 6
F,
Floating Decimal. will calculate all decimals in the answer.
A, Add M ode, setting used for addition and subtraction.
0, 1,2,3,4,6 setting determines the number of decimals in the answer only.
2. ROUND
OF F SELECTOR
.r 5/ 4.t
.r Truncate or dr op orr, 5/4 Round orr 5 or m ore , t Round Up 1 or more.
3.IFEEDI
Advan ces paper.
4. [!9 ITEM COUNTE R (420 only)
Recalls numher in the item counter register (add register and = + registerl.
5. B NON-PRI
NT (Latch Down)
Turns o ff print mechanism .
6.0 PRINT KEY
Prints only
the last number when depressed .
7. ~
Clears entire machine.
8. ~ CLEAR KEY
Clears X and -;- func tion only.
9.
~ CLEAR ENTRY
Clears keyboard entry not function X or -;- .
10. ° ... 9 numeral keys.
11. 0 DECIMAL POI NT KEY
Enters decimal point.
12 . G ADDITION KEY
13. B MINUS KEY
14.8 TOTAL KEY
Totals r es ult of addition and subtraction.
5

15 . p/#I
This key has dual function, when depressed immediately after number is in·
dexed acts as non-add, when depressed after +
or -acts as subtotal.
16.
~ MULTIPLICATION KEY
Sets lip multiplication and holds multiplier as c onstant.
17. BDIVISION KEY
Sets up division and holds divisor as constant.
18. GCalculates result of multiplication and division.
19. ~ PERCENT AGE KEY (See examples)
20. BEQUAL PLUS
Ca l culate s results of multiplication and division and automatica ll y accumulates
result in add register.
2
1. 0 MEMORY PLUS EQUALS
Automatically
ca lculates results of multiplication and division and adds results
in memory.
22 . [0 MEMORY MINUS EQUALS
Automatically calculates results of multiplication and division and sub
tr acts
results from memory.
23.IMol MEMORY SUBTOTAL
24.[ill MEMORY TOTAL
25. ~ MEMORY PLUS
Adds directly
to memory .
26.0 MEMORY MINUS
Subtracts directlv from mem()rv
27.
IQ] Prints contents of Grand Tot al Register, Ite m Cou nter of GT Register,
Item Counte r of GT Register and clears (4 40 on ly).
28 . M · UGHT IN DISPLAY PANEL
29.-+-
OVERFLOW LIGHT IN DISPLAY PANEL
30. - NEGATIVE LIGHT IN DISPLAY PANEL

RIBBON CHANGE
1. Inked Ri bbo n s ho uld be good qua lity and high den si ty in ked ribb on.
2. Inked Ribbon sho uld be set as show n in fi g ures one ( I) and (2). Spo ols sho uld
latch in place.
3. If Ribbo n is l oose. turn spo ol until ribbon is taut.
RIBBON
FRAME
FIG. (1)
FIG. (2)
7

PAPER CHANGE
l. Before loading paper roll, be cer tain the end that is to be insert ed in to the
machine is not torn or irregula r.
2. Mount P aper roll on P ap er Holder . In se rt pa per into the sl ot and de pr ess IFEEDI
Key until paper extends beyond tear o ff blade.
CORRECT
IN CORRECT

OPERATING EXAMPLES
Addition and Subtraction
Prohlem Switches Entry Depress Tape Display
12 .1 + 4 ~ (, + 7RY
De cimal
A. 0, /4
[C ][I] QJ
G 1 23 + 123
0w GJ
G 40,6 +
0,.79
00[TI
G
7~q + tJ.oB
~
II. h8 T tJ.hk
R epea l addition
and suhtrac
ti ll ll A. 0,/4
[IJ00
G
1.23 + 1.2.\
GJ
1.23 +
2. · H,
G 1.
23 +
.1.69
G 1
.23 -Irc:dJ 2.-10
8
2.4 {, T 2.
-16
In + -IS6 - 7tN A.
5/ 4
[i]w0
G 123 +
1.23
ElITJ G 0
4SI ) +
~.7q
[2J[IJGJ G 7 .fN - Irc:d) - 2 .1 0
G
-::. l OT Irc:d I -
llO
9

Multiplication
Prol>lem Switch es Entry
De press Ta pe Display
12 X L\ 2.
;:, 4
DJITJ
0]0
0
El
12
X
u.
1:,n.OO.
J2.
J:'h.O()
Chain J11uhiplicalinn
2 X.\ X 4 2.
5'4 0
W
GJ
0
0
0
2. X
J X
.:\
24,()( )*
],
6
24,{)()
Cnnstanl
Jllullipli c lIi(ln
12 X 2
2. 5/4 [D[IJ
W 0 0
12 X
2
=:
2-l.()O.
12
2UX)
12 X 3
[TI
0
.'l =:
.16'c)() *
.\
.'\6( ~)
12 X -l
0 EJ
-l =:
4R C)()·
.:j
4K()()
12 X ;:,
.
[8
B
~ ~
hO.OO·
~
60.m
10

Division
Problem Switcbes Entry Tape Display
Depress
144 -;- 12 1 44 -;-
2.
:'>/ 4 1 44
GJ00
B
COo]
12 ~
12. 00 -
0 12.00
Chain div ision
1 23 -;- 5 -;- ()
1 23 -;-
[JJITJIT]
2. 5/4 1
23.
B
B 5
.;-
IT]
2·U
[IJ
() ~
El
~ . I()
4. 10-
Constant div i si on
2. 5/4
1 45 -;- 12
145 -;-
I ~:;
QJ8JQJ
El
1 59 -;- 12
eDIT]
12 =:
144 -;- 12
~
1 2.0~
12.01-1 -
QJ [I] QD
1 59 =:
Ll.25-
G
1.' \2:)
144 '=:
G
ITJ0 GJ
12 .00
12 .00 -
Mixed Calculation
Problem Switches Entry Depress Tape Dis
pla y
(1 23 - 23) -;- 4 X 5
2. 5/4
QJ 0 0
0 0
G
m
G
6
8
G
G
~
123.00 +
D.OO -
(red)
100.00 T
100.00
-;-
4 X
5 '=:
125.00·
123.00
100.00
100.00
100.00
25 .00
125.00
125.00
11

Accumulation Calculation
Tape Display
Depress
Problem Swilches Enlry 0 12 X
12
12 X
12
[TI m
A. 5/ 4
OJ [I] J2 =:
10 x 10 B
14 4,()() +
14 4,00
[Q[QJ
10
1,2,
::; + 10 X
0 10
=:
B
OJOD
I
()() ()()
l o(),n o +
G 1
,2 5 + 24. i 25
QJ mGJ
24,i25
24:'> ,2:' T
GJ
Percentage Calculalion
Prohlem
100 X 1 0" \,
250
-;- 25° {,
Percent. Add on
an d Disco un t
12 5. l ess " 'Yo
Disco un t plu s'
6% Tax
Switches
2. 51 4
2.
5/ 4
2. 5/4
Tape Display
Depress
Entry
OJ QiJl2U
OJ@]
ITl ITl GJ
WG]
OJ [I] [8
G
W
I 100
J(X l X
0
[7J
I () 'x.
I () , m·
I°,(X)
2~ () -;- 2:'0
B I
O()() ,00
[Z]
I 000 ,00 *
0 125
1 2 ~ X
~
5 · ~ · l
h,2 5
(, ,2 ~ *
G I I
R.75
11 11.75 - %
0 I P
U5 X
5J
7. LI
(" %
7, IJ.
EJ
1
25,RR
125 ,1\H + %
12
I

Memory Calculation
Problem Switches
Entry
Depress Tape
Display
o X 5
4 X 8
2. 5/ 4
~
IT]
0
~
o X
5 ~
0
5
7X9
---
To tal·
J
GJ
[]J
0
0
JO . oo + M
4X
8~
M 3 0.00
4
8
[I]
[I]
0
0
32.oo+M
7X
9 ;"
32.
00
7
9
03. oo+M 63.00
~ 12S()()
·M
12 5. 00
Memo ry Calc.
with
Conswnt
12 X 1. 25
12 X 4.25
2. 5/ 4
00
ITJ DITJITJ
0
~
12 X
1.25;"
12
12 X 7YS
00 [}] [I]
~
IS.
OO+ M
4.25
~
I \(X)
51.()()+ M
:; 100
[2JD~ITl
~ 7.
YS ~
0
l)S.40+M
IhlAO*M
Y:;.40
101.40
Additi
on and
Suhtra c tion
into M emory
12 .\ -4:,h + '7HY
A. 5/4
[][TI0
~[I][IJ
C2JITJw
0
~
0
fill
l.2 3+ M
4.56- M(red)
7. 89+M
4.50
1.2:\
4.50
7.89
4.56
13

Invoicing
Problem Switches
Entry
Depress Tape Display
12 Items @ 1.2 5
24 Items @ 2.98
A. 5/ 4
OJ [I]
OJ 00[}]
0
0
12 X
1.2 5 ~
12
1.2 5
5 Items @
1.59
Total
Di scount 2%
mIT]
GJO[2J[I]
0
~
15. 00 +M
24 X
2.9R ~
1 .00
24
2.9R
Ta x 5%
Total
IT]
[IJO[IJeTI
0
~
7 1.5 2+ N1
5X
1.59 =:
7 1. 52
5
1. 59
m B
0
[8
, 0
7.95+M
94.47-M
9
4.47 X
2 O,{ l
7 .9 5
9447
94.47
2
IT]
EJ
0
5J
1. 89 -
92 . 58 - %
92.511 X
5 ~~ l
1.8 9
92 .5 8
92 . 511
5
G
4. 63 -
97.2 1+ %
4.6:1-
97 .21
14

Cross Footing
Example:
1.23
4.56
7. 89
1.4 7
2. 58
3.69
13 .68 7. 74
Grand Total 21.42
Switches
EDtry
Depress Tape Display
Decimal
A. 5/4
[HI] []
1. 23 + 1.23
GJ
4.56 + 5.79
mITlru
G
[fJ
ITJ0[1J
7. 89 + 13.68
8 13.68 T 13.68
[B
QJmITJ 1.4 7 + 1.47
[±]
ITJITl[]J
4.05
2.58 +
G 7.74
3.68 +
0mCIl
8 7.74 T 7.74
21.42 G 21.42
~
15

Percentage Distribution
What Pe
rce nt is ea ch num ber of the Total ')
Example: Amo unt Pe rcent age
12 3. 00 . 09 %
456.00 .33%
7119 .00 .5 8%
13611. 00
1. 00%
Switcbes Entry Depress Tape Display
De cima l
2. 5/4
OJ ITJ DJ
G
[B
00ITJ
GJ
[i][IJ[I]
0
~
B
[D[I]0
~
[i]mIT]
~
G
1 2J.~
1 2.1
12 3.00 + 1
2.1.00
45<' .00 +
579 .00
7k Y.()0 +
1J6R . OO
I :1 08.00 T
Ll61\ . 00
136R =:
J:l6 R.00
O
.Ol) + 0
.0 9
456
=:
456
O .. "l:l + 0.33
789 =:
711 9
0.58 +
0.511
1. 00 T 1.00
Percent of Increase or Decrease
Example: Sales 1974 Sales
197 5 Incr
ea se Per ce nt
In
crease
789,65 4. 00 987.456.00
19 7,802. 00 25 . 05
Switches Entry Depress Tape Display
D ec imal
2, 5/4
[I] [I] [2J[TIww
[2J[I][TIw[I]0
B
0
B
B
987456.00 +
789654 .()() +M
789 654 .00 :::: "
197802.00
.;-
9874 56 .00
789654.( )()
19 7802.00
197802.00
~
7896S4.00 ·M 78 96 54.00
~
789654. %
8
25 .0 5-
197802.00 T
25 .0 5
19 7802.00
16

Payroll
Example:
Rate per hour
Overtime
Hours (Reg.)
Hou
rs (O.T.)
Soc
ial Security
State Tax
In come Tax
Hospitalization
4.
52
1.1 12
40
8.3/4
.0 585 (factor)
.02 5 (factor)
(Se e Inco me Tax Chart)
6. 50
Swilches
Decimal
A. 5/4
Entry
EJ D [TI [I] I Kat e)
o ~ (H rs Reg .)
Depress
0
~
Tape
4. 52 +
-+ 0 ~
Displa~
-+.52
IT] D IT] iO.T. Rate) B I
Ku.H O+M
1 5
~
I HO.H()
{ , . 7 ~
IIID [I] [JJ (OT. Hrs l 0
0
h. 7R*
6. 78 X
H.
75 ~
6.71'
h. 7h
59 . JJ +M
S <). 3J
D OD IT] [I] IT] (5. 5 .1
~
0
EJ
240. I JOM
240 .1 3 X
0.0585 =:
240 .1 3
240.1J
o [QJ OJ IT] (State Tax)
EJ
14 .05 +
0.025
~
14. 05
6.00 + 6.CXl
~~D~][ Il
(Income T ax Chart)
m Om[I]
(Hospitalization)
G
0
8
~
~
48.03 +
6.
50 +
74.58T
74.58-M
(red)
1 65 .5S*M
61\08
74 . 51\
7 4. 58
74 . 58
165.55
I7

CORPORATE OFFIC ES
TCAINCORPOR ATED
1701 SOUTH PENN SYLVANIA AVENUE
MORRISVILL E, P ENNSYLVANIA 19067
C_T _C_A ___ )
SERVICE CENTER LOCATIONS
You may cont actany of these Service Centers
to obtain the location of the nearest author-
iz ed TCA dealer.
NEW JERSEY
65 W. Sheffield Avenue
Englewoo
d, New Jersey 07631
[phone]
GEORGIA
3955 Pl easantdale Road
Sui
te #108
Atlanta, Geo rgia 30340
[phone]
ILLINOIS
2510 Dempster
Suite
#10 6
Des Plaines, Illinois 60018
[phone]
TEXAS
6350 LBJ Freeway
Registry, Suite #137
Dallas, Tex
as 75240
(2 14) 233-7215
CALIFORNIA
3605 W. MacArt hur Boulevard
Suite
#708-709
Santa An a, California 92704
[phone]
PENNSYLVANIA
1701 So. Pennsylvania Avenue
Morrisville, Pennsylvania 19067
( 21 5) 736-0047

PRINTED IN ,JAPAN