This
part
of
the
manual
provides the information necessary for
implementing
the
FORTRAN
program
on
the
1620 computer.
It
is assumed
that
the
reader
has a prior
knowledge of 1620 operating principles.
OPERATING
PRINCIPLES
is
divided
into
two
parts,
PRODUCING
THE
OBJECT
PROGRAM
and
EXECUTION
OF
THE
OBJECT
PROGRAM.
Producing
the
Object
Program
Clearing Core Storage
to Zero
Switch Settings
The
FORTRAN
program is available in four forms,
card
and
paper
tape
with
or
without
the
1443 Printer. All forms
are
divided into two sections;
the
processor
and
the
subroutines.
The
sequence of operations
that
follows is
written
for all
systems.
Eight
basic steps
are
required
for
producing
the
object program.
These
eight
steps
are
summarized below, followed
by
additional detailed information for
steps
1,
2,
6,
7,
and
8.
l.
Clear core storage to zeros.
2.
Set
the
console program switches for compilation.
3.
Set
the
overflow check switch to
PROGRAM
and
all
other
check switches to
STOP.
4.
Press
the
reset key.
5.
For
the
card
system,
prepare
the
card
punch
for operation
by
loading
blank
cards into
the
punch
hopper
and
by
pressing
the
punch
start
key.
For
the
paper
tape
system,
prepare
the
paper
tape
for operation.
6.
Load
the
compiler program deck or tape.
7.
Ready
the
Printer.
8.
Enter
the
source program statements. These
may
be
read
in
through
the
card
reader,
the
paper
tape
reader, or
typed
in
at
the
console typewriter.
9.
If
required, load
the
subroutine deck or tape.
(Step
1)
A suggested
method
for clearing core storage to zeros is:
l.
Press
the
reset key.
2.
Press
the
insert
key.
3.
Type
the
instruction 16 00010 00000.
4.
Press
the
release key.
5.
Press
the
start
key.
6.
After all storage positions have
been
cleared, press the instant stop key.
(Step
2)
During
compilation
of
the
source program,
the
console
program
switches per-
form
the
following functions:
ON
Switch 1 Causes
the
source statements to
be
typed
or
printed
as
the
are
processed.
The
first 5-digit
field is
the
object program address of
the
first
instruction compiled for
the
source statement.
Switch 2 Causes
trace
instructions to
be
compiled.
OFF
Source statements
are
not
listed.
Trace
instructions
are
not
compiled.
Operating Principles
51
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