EasyManuals Logo

IBM 7090 User Manual

IBM 7090
190 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #150 background imageLoading...
Page #150 background image
6. 1.
02
Manual
Controls
Figure
6.1-1
shows
the
keys
and
switches
on
the
operator's
panel
that
provide
for
starting
and
stopping
the
machine
and
initiating
computer
functions.
All
keys
are
of
the
spring-returned
variety
with
the
exception
of
the
auto-manual
key,
entry
keys,
sense
switches,
and
emergency-off
key.
Power-On
With
the
system
in
normal-off
~tatus,
pressing
the
power-on
key
will
commence
the
power-on
sequence.
Ready
status
(power-on)
will
be
reached
in
about
20
seconds.
As
power
comes
on,
a
clear
operation
is
performed,
resetting
all
registers
and
triggers,
and
setting
memory
to
all
zeros.
Normal-Off
The
normal-off
key
will
initiate
the
following:
1.
Immediate
removal
of
60-cycle
power
from
the
MG
set,
MG
blower,
and
all
frame
blowers
except
memory.
2.
Immediate
removal
of
400-cycle
power
from
the
30-60
volt
memory
power
supply.
3.
After
5
seconds,
removal
of
400-cycle
power
from
the
standard
memory
supply.
4.
After
3
minutes,
removal
of
power
from
the
memory
blowers.
The
dropping
of
the
60-cycle
power
removes
the
input
to
the
MG,
but
the
MG
still
rotates
at
about
full
speed
for
longer
than
5
seconds,
allowing
the
memory
power
to
sequence
down.
Emergency-Off
When
the
emergency-off
switch
is
pulled,
all
power
is
immediately
removed
from
the
7090
system,
except
the
voltage
to
HR 24
and
HR
30
points
in
the
power
control
unit.
The
emergency-off
switch
is
to
be
used
only
in
emergencies,
because
of
possible
dam-
age
to
circuits.
Resets
The
reset
circuits
control
the
resetting
of
various
components
in
the
system.
There
are
three
types
of
resets
which
may
be
initiated
from
the
panel.
An
interlock
reset
is
initiated
by
the
load
keys,
clear
key,
and
power-on
key.
It
causes
the
resetting
of
all
registers
(except
sense
indicator),
panel
light
(except
power
on
and
ready),
all
channels
that
are
in
operation
and
their
associated
registers.
An
operator's
reset
is
initiated
by
the
reset
key.
It
performs
all
the
functions
of
an
interlock
reset
plus
a
bias
reset
for
CPU
triggers.
A
power-on
reset
occurs
when
power
is
applied
to
the
system.
This
reset
accomplishes
an
interlock
reset,
an
operator's
reset,
plus
the
resetting
of
the
clock
and
setting
core
storage
to
all
zeros.
The
clear
key
also
initiates
a
power-on
reset
if
the
machine
is
in
automatic
status.
Automatic
-
Manual
Key
The
auto-manual
switch
controls
the
rest
of
the
switches
on
the
console.
If
a
pro-
gram
is
running
in
automatic
status,
and
the
switch
is
put
in
the
manual
position,
the
program
will
stop
after
it
completes
the
operation
it
is
performing.
If
an
1-0
program
is
running,
1-0
will
complete
the
operation
before
stopping.
The
auto-manual
switch
will
not
affect
the
program
stop
status.
149

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the IBM 7090 and is the answer not in the manual?

IBM 7090 Specifications

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