IBM 1130 User Manual page 123

1130 Considerations
1.
Lining up similar fields between cards is
desirable for ease of recognition, for offline
punched card processing, and for ease of card
handling. A program can as easily define a field in
one set of columns as in another.
2. The results of calculations often do not have
to be punched into cards.
It
takes but a few milli-
seconds for the computer to recalculate the same
figure the next time it needs it.
3. The EBCDIC character set contains 256
possible codes. However, many of them cannot be
handled by standard FORTRAN programs. Only 53
characters are permitted in card input (see the
FORTRAN manual, C26-3715); of these, only 48
may be printed by the 1132 Printer.
Section Subsections
Page
20 30
I
10
4. Normally, an II-punch over the units posi-
tion of a field indicates to the 1130 Commercial
Subroutine Package that a field is negative, while
01
a 12-punch or no-zone indicates that it is positive.
The combinations (11-0) and (12-0) are not valid
FORTRAN codes. However, the 1130 Commercial
Subroutine Overlapped I/O Package can handle them.
5. Punching speed for serial punches (1442)
varies with the last column punched. For example,
if the card is to be punched in cc 1-10, 176 cards
per minute can be punched on a 1442, Model 6. The
same data can be punched in cc 71-80 at only 49
cards per minute. Therefore, fields to be punched
should be placed close to column 1. Fields to be
read can then be placed anywhere to the right of
fields to be punched, with no effect on card reading
speed.