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IBM 7090 User Manual

IBM 7090
190 pages
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The
input
section
of a
computer
system
accepts
information
from
any
outside
source
and
places
it
in
the
storage
section.
This
information
may
come
from
punched
cards,
magnetic
tape,
or
manually
operated
keys.
The
information
may
be
instructions,
data
(numbers
for
arithmetic
calculations),
or
alphabetic
characters
for
printing
page
headings,
comments,
and
so
forth.
The
storage
unit
accepts
and
stores
information
that
com
es
into
the
system
through
the
input
section.
When
any
portion
of
the
information
in
storage
is
needed,
that
por-
tion
is
located
and
sent
out
to
the
section
that
requested
it.
All
information
in
the
sys-
tem
is
at
one
time
or
another,
in
storage;
therefore,
computer
speed
depends
on
storage
speed.
The
storage
scheme
of
most
computer
systems
today
is
random
access--
any
portion
of
information
can
be
located
directly
without
searching
other
locations.
The
arithmetic
section
is
the
calculating
section
of
the
computer
system.
Here,
portions
of
information
~
either
instructions
or
data,
can
be
transformed,
combined,
or
altered.
The
control
section
directs
the
other
sections.
It
tells
them
what
to
do
and
when
to
do
it.
Instructions
come
into
the
control
section
from
storage.
The
control
section
also
controls
itself
in
that
it
keeps
account
of
the
instruction
it
is
using
and
the
one
that
it
will
use
next.
The
output
section
takes
calculated
information
from
storage
and
presents
it
to
an
outside
user.
Commonly
used
forms
of
output
are:
information
on
magnetic
tape,
punched
cards,
printed
reports,
or
indicator
lights.
1.
3.
00 7090 SYSTEM
MAKE-UP
The
7090
system
includes
all
five
of
the
sections
previously
mentioned.
Figure
1.
3-1
shows
the
general
grouping
of
these
sections
in
the
7090
system;
arrows
indicate
the
general
flow
of
information.
Although
the
functional
sections
can
be
neatly
separ-
ated,
in
practical
application
it
is
more
likely
that
some
will
be
combined
and
others
~
separated.
Input
and
output
are
combined
with
a
portion
of
control
in
a
data
channel,
and
arithmetic
with
another
portion
of
control
in
the
central
processing
unit
(CPU).
Storage
is
the
only
functional
section
that
is
a
separate
machine
unit.
The
mUltiplexor
controls
the
routing
of
information
into
and
out
of
storage.
The
arrangement
shown
in
Figure
1.
3-1
allows
input-output
to
operate
somewhat
independently,
sharing
storage
with
CPU.
The
highest
order
of
controls
is
in
the
CPU,
where
control
is
delegated
to
the
lower
order
controls
in
the
data
channel
and
multi-
plexor.
A
representative
7090
system
appears
in
Figure
1.
3-2;
the
physical
grouping
of
7090
functions
is
shown,
with
machine
types.
The
tBM
7100
Central
Processing
Unit
is
contained
in
two
cabinets,
or
frames,
CPU1
and
CPU2.
The
7151
Console
Control
Unit
provides
manual
controls
for
the
system
operated
as
a
whole.
The
IBM 7606
Multiplexor
and
IBM 7302
Core
Storage
correspond
to
the
same
units
shown
in
Figure
1.
3-1.
The
number
of
machines
available
for
7090
input-output
(1-0)
operations
is
variable,
but
only
seven
types
are
ordinarily
used:
6

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IBM 7090 Specifications

General IconGeneral
CategoryMainframe Computer
Introduced1959
Transistor-basedYes
Word Length36 bits
Add Time4.8 microseconds
MemoryCore memory
Memory (words)32, 768 words