Table of Contents
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Preface
Each of the six sections of this manual is developed for a specific need of a
FORTRAN
user. This preface was designed to enable you to quickly locate and ex-
tract the segments of 1620
FORTRAN
that are most important to you.
Part l.
INTRODUCTION TO IBM FORTRAN
is intended for readers who have
neither a previous knowledge of other
FORTRAN
systems nor a background in data
processing. This part tells what
FORTRAN
is, and what the 1620 Data Processing
System is.
Part 2.
WRITING THE
1620
FORTRAN PROGRAM
is developed primarily for the
"nonprofessional programmer," a person not engaged in programming as a full
time occupation. This part of the manual tells how to write a
FORTRAN
program.
If your responsibilities are concerned with only writing
FORTRAN
programs, and
not processing them on the computer, you need not read the other parts of the
manual. Appendix A contains a summary of 1620
FORTRAN
statements.
Part 3.
OPERATING PRINCIPLES
provides the information necessary to imple-
ment the
FORTRAN
syst~m
on the 1620 computer. If you are a machine operator,
or a programmer processing a program, this part of the manual will show you
how to place the program into the machine, provide the proper setting of the
switches, explain the use of the keys on the 1620, explain the type of program-
ming errors that the
FORTRAN
program will detect, and show you how to enter
input data.
Part 4.
ANALYSIS OF THE FORTE-AN PROGRAM
is intended for the experienced
programmer. This part of the manual describes certain features of the program,
shows where data is located during processing, shows how the program may be
amended, and provides the general format for card and paper tape input data.
Part 5. The
FORTRAN PRE-COMPILER
program is described in this part. The
Pre-Compiler is a special program provided by
IBM
to enable the
FORTRAN
pro-
grammer to "pre-test"
FORTRAN
programs. This program detects and permits cor-
rections of the more common programming errors. Read Parts 1 and 2 before
reading this part of the manual.
Part 6. Appendix B is a summary of the operating principles described in the
following
IBM
publications:
IBM 1620 Central Processing Unit, "}Y1odel1 (Form A26-5706)
IBM
1621
Paper Tape Unit (Form A26-5836)
IBM
1622
Card Read-Punch (Form A26-5835)
IBM 1443 Printer for 1620/1710 Systems (Form A26-5730)
This appendix is intended for the
FORTRAN
user who has no previous 1620
operating experience.
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