The
'8M
Card
Five
units
are
used
with
the
IBM
1620
FORTRAN
System.
The
IBM
1620
Cen-
tral Processing
Unit
contains
the
computer, 20,000 positions of core storage, a
console panel,
and
an
input/output
typewriter.
The
1443
Printer
is
available for
high-speed
printed
output.
Paper
tape
operations
are
permitted
by
the
IBM
1621
Paper
Tape
Unit,
which
also includes
the
paper
tape
controls
and
Tape
Punch.
The
IBM
1622
Card
Read-Punch
is
available for
card
operations.
The
IBM
1623
Storage
Unit
expands
the
20,000 core storage positions in
the
Central
Processing
Unit
to 40,000
or
60,000 positions.
The
console
of
the
1620 contains control keys, switches,
an
indicator panel,
and
a typewriter.
The
control keys
and
switches
are
used
for
manual
or
auto-
matic operation of
the
system.
The
console
panel
provides visual indication of
the
status of various registers
and
indicators.
The
typewriter
provides
direct
entry
of
data
and
instructions into core storage;
it
also provides a
permanent
log
of
the
operator's intervention
during
the
execution
of
a program.
Information is
entered
into
the
system
by
input
devices; namely,
the
IBM
1621
Paper
Tape
Unit,
the
IBM
1622
Card
Read-Punch,
and
the
typewriter.
The
1622 reads 80-column cards
at
a maximum
rate
of
250 cards
per
minute.
The
1621 reads
an
8-track
paper
tape
at
the
rate
of
150 characters
per
second.
The
operator's
typing
speed
determines
the
rate
at
which
information enters
through
the
typewriter.
The
IBM
1622
Card
Read-Punch,
the
Tape
Punch,
the
1443 Printer,
and
the
typewriter
are
output
devices which
record
the
processed data.
The
typewriter
prints
at
a maximum
rate
of 10 characters
per
second;
the
card
punch
and
tape
punch
operate
at
the
rate
of 125 cards
per
minute,
15
characters
per
second,
respectively.
The
1443
Printer
prints 240 lines
per
minute
with
the
52-character-
set
type
bar.
The
IBM
card
is
divided
into
80 vertical areas called "columns"
or
"card
columns."
They
are
numbered
from 1 on the left to 80 on
the
right
side
of
the
card.
Each
column is
then
divided horizontally into twelve
punching
positions.
The
punch-
ing
positions
are
designated
from
the
top
to
the
bottom
of
the
card
by
12,
11
(or
X),
0,
1,
2,
3,
4,
5,
6,
7,
8,
and
9.
The
punching
positions for digits 0
to
9
correspond to
the
numbers
printed
on
the
card.
Each
column of
the
card
is
able
to accommodate a digit, a letter, or a special character.
Thus
the
card
may
con-
tain
up
to 80
individual
pieces of information. Digits
are
recorded
by
holes
punched
in
the
digit
punching
area of
the
card
from 0 to
9.
ABC
D E F 6 H I J K L M N 0 P Q R
STU
v W
~
V 2
123
4 5 6 7
890
I I I I I I I I I
I I I I I I I I I
00000000000000000000000000000000000001010101010101010000000000000000000010000000
1234
56
7891011121314151611181920212i2J242526'171SZS303132JJ.}43!1363738394{1414243444546414849S05152SJS45S56575859606162636465666768697Q7172737475,611781980
11111111111111111111111111111111111111111111111
11
11111
11111111111111111111111111
22212222222222222222212222222222222221;;
2 2 2 2 2 2 2 2 2 2 2 2
22222122222222222222222222222
3 3 3
3313
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
313
3 3 3 3 3 3 3 3 3 3 3 3 3 3
13
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
13
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
44444441444444444444444441444444444444444144444444444444444414444444444444444444
555555555155555555555555555155555555555555515555555
5
555
5 55 5
55515 55555
55 5 5 5 55 5 55 5
66666666666166666666666666666166666666666666
61s
6 6 6 6 6 6 6 6 6
666666661666666666666666
7777777777777177777777777777777177777777777777717777
7 7 7 7 7 7 7 7 7 7 7 7 7
7177777777'77777
8 8 8 8 8 8 8 8 8 8 8 8 8 B
818
8 8 8 8 8 8 8 8 8 8 8 8 8 8 8
81s
8 8 8 8 8 8 8 8 8 8 8 8 8 8
18
8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8
18
8 8 8 8 8 8 8 8 8 8
999999999999999991999999999999999991999999999
S 9 9 9 9
919
9 9 9
9999999999999
q
19
9 9 9 9 9
999
1 2 3 4 5 6 1 8 9
10
II
12
1)
'4
~5
16
11
18 19
20
21
22
2J
24
2S
26
'27
28
29
30
31
32 33 34 35
36
31
3a
39
.\0
41
4~
43 44
4S
46
47
48
49
50
51
52 53 54
:>S
56
57
58
59
60
61
62
5:.1
64 65 66 67
58
69
'I)
II
I~
13
14
75
16
17 18
19
!m
As
illustrated
in
the
drawing, a combination
of
a zone
punch
and
a
digit
punch
is
used
to
accommodate
any
of
the
26 letters
in
one
column.
Introduction to
IBM
FORTRAN
9
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