IBM 1130 User Manual page 563

Section
Subsections Page
70
40
I
20
12
Working with Zone Punches -- NZONE
The top three rows of the data processing card are
commonly called the "zone" rows, and a punch in
one of them is called a zone punch. The top row is
called the 12 zone; the next, the 11 zone; and the
next (the 0 row), the 0 zone. (See Figure 7
O.
32. )
A digit overpunched with .a 12 zone punch is taken
to be positive; an 11 punch indicates negative. This
is quite reasonable, since an 11 punch alone is a
minus sign, and a 12 punch is an ampersand
(&)
or
plus sign
(+),
depending on the coding scheme and
cardpimch used. (While many people use the term
"X punch" instead of 11 punch, both mean the same. )
The 12 punch is rarely used, since it is easier
to have no zone punch for positive numbers.
The zone punch, when used to indicate the sign,
should be placed over the units (rightmost) position
of the field. For example, -1675 would be punched
with an 11 punch over the 5.
This practice will result in a card code equiva-
lent to one of the letters J through R, or a negative
·zero. The table below shows the card code equiva-
lents:
These punches
Mean either this Or this
11,0 -0
0
11,1 -1 J
11,2 -2
K
11,3 -3
L
11,4 -4
M
11,5 -5 N
11,6 -6 0
11,7 -7
P
11,8
-8
Q
11,9 -9 R
If
the card containing the 1675 field were inter-
preted, or listed character for character, it would
appear as 167N, where the character N is equiva-
lent to a 5 and an 11 punch.
In a few cases, zone punches may also be found
in card columns other than the low-order digits of
a numeric field. This is particularly true in instal-
lations that once had a unit record, or punched card,
system.
In
such a system, zone punches provided
an easy way to pack additional data into a punched
card.
One of the advantages of the CSP overlapped
I/O routines is that they allow the input and output
of fields with zone punches. This is normally quite
difficult with standard FORTRAN READs and
WRITEs, since the 11,0 (- zero) punch is not per-
mitted.
etc,
. - - - - - - An 11-punch, X-punch,
or
minus sign
. . . - - - - A 12-punch, &,
or
plus sign
An N or a 5 with an 11-punch
':(
~l
I
I I
0000000000000000000000000000900000000000
1111 5 6 18 910111113111511111111212122232125161111213031313331353131313911
1111111111111111111111111111111111111111
2 2 2 2 2 2 2 2 2 Z 2 2 2 2 2 2 2 22 2 2 2 2 2 2 2 2 2 2 2 22 2 2 2 22 2 2 2 2
33333333333333333333333333333333333333333
4 4 4 4 4 4 4 4 4 4 4 • 4 4 4 4 4 4 4 4 4 4 4 44 4 4 4 4 4 4 44 4 4 44 44 4 44
555555515555555555555555555555555555555555
6666666666666666666666&666666666666666&6&6
7 7 7 7 7 7 1111'11 11 7
1
11 1 1 I 11111 1 1 I 11111 111 1111
8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 I 8 8 8 8 8 8 8 8 8 8 8 8 18 88 8 8 8 I
ggJ99999999~9999999992999999999999999999
I 2 3 4
~
6 1 , 9 10 11 12 13 14 IS 16 11 11 II 20 21 22 23 24
2~.
25 21 21 21 31 31 32 13 S. :t5 l5 11 1I 31 41
Figure 70.32.