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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