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IBM 7090 User Manual

IBM 7090
190 pages
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It
is
possible
for
a 7090
with
the
full
eight
data
channels
to
have
eight
1-0
programs
and
the
CPU
program
in
operation
simultaneously
--each
independent
of
the
others
and
all
sharing
core
storage.
The
IBM 7302
Core
Storage
is
a
fast,
random-access
storage
unit.
A
unit
of
informa-
tion
can
be
read
into
(or
out
of)
anyone
of
its
32,768
storage
locations
in
2.18
micro-
seconds.
Read-out
is
spoken
of
as
being
nondestructive
in
that
the
information
remains
intact
in
core
storage
after
read-out.-
Storage
serves
both
the
CPU
and
data
channels.
The
only
restriction
is
that
no
two
units
can
be
using
storage
at
exactly
the
same
time.
If
a
data
channel
calls
for
storage
while
CPU
is
using
storage,
the
channel
waits
until
CPU
permits.
storage
priority
to
pass
to
the
channel.
The
IBM 7606
Multiplexor
is
a
time
sharing
and
switching
device.
It
provides
a
path
to
and
from
storage
for
the
CPU
and
data
channels.
The
multiplexor
also
performs
certain
anticipatory,
or
look-ahead
functions
associated
with
data
channel
operations.
The
IBM 7151
CPU
Console
Control
Unit
provides
the
means
to
manually
control
the
system
and
to
display,
in
indicator
lights,
the
contents
of
various
registers,
or
anyone
of
the
storage
locations.
Several
registers
are
continually
displayed.
The
console
also
houses
the
C E
test
panel
and
the
marginal
voltage
check
panel.
1.
4.
00 7090
GENERAL
LOGIC
The
7090
system
operation
can
be
compared
to
a 407
-514
summary
punch
operation.
The
card
feed
in
the
407
is
input;
storage,
arithmetic,
and
control
are
in
the
407;
the
407
print
wheels
and
514
punch
are
output.
The
514
punches
a
card
only
when
instructed
to
do
so
by
the
407
and
information
to
be
punched
must
be
in
storage
and
wired
to
the
514.
The
407
waits
for
a
signal
from
the
514
before
proceeding
to
another
operation.
Similar
requirements
for
control
exist
in
the
7090
system.
Input
waits
in
a
ready
status
until
called
for
by
the
control
section;
the
control
section
manipulates
information
in
a
pre-
determined
manner
and
sequence;
output
operates
when
called
for
by
the
control
section.
Again--as
in
the
accounting
machine,
summary
punch
system--the
control
section
is
continually
informed
of
the
progress
of
events
in
all
sections
so
that
another
operation
can
be
initiated
as
soon
as
the
current
operation
is
complete.
An
example
of
information
flow
and
control
in
the
7090,
is
the
sequence
taken
by
the
system
in
solving
the
following
problem:
Given:
Problem:
The
quantities
A
and
B
punched
in
a
card.
Add B
to
A
and
print
the
result,
C.
(A+B =
C,
print
C)
1.
Cause
the
card
reader
to
run
and
feed
the
card.
2.
Read
the
information
from
the
card
and
place
it
in
storage.
3.
Bring
A
from
storage
into
the
arithmetic
section.
4.
Bring
B
from
storage
and
add
it
to
A.
5.
Place
the
result,
C,
in
storage.
6.
Cause
the
printer
to
run.
7.
Bring
C
from
storage
and
send
it
to
the
print
wheels
for
printing.
9

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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