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IBM 1620 User Manual

IBM 1620
111 pages
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Tape
Duplication
Modification of
1620
FORTRAN for
Additional Core Storage
Modifying
the
Processor
The
procedure
for
duplicating
the
"1620
Program
for
Duplicating
the
FORTRAN
Processor
and
Subroutine
Tape"
is:
1.
Thread
the
FORTRAN
processor
and
subroutine
duplicating
tape.
2.
Set
the
parity,
I/O,
MAR
(if
any),
and
OF
LOW
switch
to
STOP.
3.
Ready
the
punch.
4.
Press
the
reset
and
insert
keys.
5.
Insert
36 00500 00300
38 00500 00200
49 00000
6.
Press
the
release
and
start
keys.
To
duplicate
the
1620
FORTRAN-SPS
Modification
tape:
1.
Thread
the
FORTRAN-SPS
Modification tape.
2.
Proceed
as
in
step 2 above.
The
standard
FORTRAN
system decks
and
tapes, as issued, do
not
require
a ma-
chine
system containing
more
than
20,000 positions of core storage.
If
additional
core
storage is
used
in
the
system,
the
processor
tape
or
deck
must
be
modified
(except
in
the
printer-oriented
system),
in
which
the
size
of
core storage is
automatically
determined
by
the
processor. 1\0 modification of
the
subroutines
is
necessary.
In
the
card
system,
the
two
high-order digits of
the
highest
address
in
storage
are
punched
in
card
columns 25
and
26, of
card
number
00025
in
the
processor
deck.
To
modify
the
program
for
additional
storage,
duplicate
card
00025
with
the
proper
digit
in
column
25.
If,
for example,
the
deck
is
to
be
used
with
a
syste~
in
which
the
highest
address
is
39999,
punch
into
column
25
the
Ragged
digit
3.
To
modify
the
tape
system, use
the
1620
program
"Duplicating
the
Processor
and
Subroutine
Tapes."
Analysis
of
the
FORTRAN
Program
71

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IBM 1620 Specifications

General IconGeneral
CategoryDesktop
ManufacturerIBM
Model1620
Introduced1959
WeightApproximately 1, 000 pounds
Memory20, 000 to 60, 000 digits
ProgrammingFORTRAN, Symbolic Programming System (SPS)
CPUDecimal, variable word length
StorageMagnetic disk drive (IBM 1311)

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