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IBM 7090 User Manual

IBM 7090
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End
Operation
The
end
operation
indicator
is
turned
on
whenever
the
end
operation
trigger
on
Systems
8.00.09.1
is
turned
on.
AND
The
AND
lamp
indicates
the
condition
of
the
AND
trigger
on
Systems
2.09.46.1.
It
can
be
used
to
distinguish
between
the
first
and
second
E
cycles
of
an
ANS
operation.
It
is
on
during
the
first
E
cycle
of
an
ANS
or
ANA
and
off
during
the
second
E
cycle
of
an
ANS.
See
Figure
6.2-2.
CAQ
The
CAQ
indicator
signifies
the
condition
of
the
CAQ
trigger
on
Systems
2.09.49.1.
It
denotes
the
difference
between
the
first
and
succeeding
E
cycles
of a CAQ
instruction.
The
trigger
is
off
for
the
first
E
cycle
and
on
for
the
remaining
E
cycles
and
I
time
of
next
instruction.
See
Figure
6.2-2.
X
Carry
The
X
carry
lamp
indicates
the
condition
of
the
X
carry
trigger
on
Systems
2.12.76.1.
The
trigger
is
on
when
the
machine
is
not
in
memory
nullification
mode
and
a
carry
occurs
from
adder
position
3.
If
the
machine
is
in
memory
nullification
mode,
a
carry
from
adder
position
4,
when
in
16K
mode,
or
a
carry
from
adder
posi-
tion
5,
when
in
24K
mode,
turns
on
the
trigger.
6.2.02
Switches
I-a
Interlock
Switch
The
I-a
interlock
switch
is
effective
only
when
the
system
is
in
manual
status.
It
has
two
positions:
automatic
and
manual.
With
both
the
automatic-manual
and
I-a
inter-
lock
switches
set
in
the
manual
position,
the
computer
will
stop
after
executing
each
instruction.
With
the
I-a
interlock
switch
set
to
automatic,
the
machine
will
not
stop
if
an
I-a
device
is
in
operation.
The
normal
setting
(automatic)
of
the
I-a
interlock
switch
allows
the
computer
to
continue
at
high
speed
after
I-a
selection,
to
allow
normal
opera-
tion
of
the
I-a
device.
The
machine
will
stop
after
each
instruction,
providing
no
I-a
device
or
data
channel
is
in
use.
Continuous
Enter
Instruction
(Figure
6.2-3)
The
continuous
enter
instruction
switch
is
effective
in
automatic
or
manual
status.
With
this
switch
on,
all
instructions
are
obtained
from
the
operator's
panel
entry
keys,
not
memory.
The
instruction
counter
is
not
used
and
does
not
advance.
The
IC
contents
will
not
be
altered
unless
a
skip,
trap,
or
transfer
results
from
the
instruction
in
the
entry
keys.
If
the
system
is
in
automatic
status,
the
instruction
will
be
executed
at
normal
operating
speeds;
if
in
manual
status,
the
speed
will
be
under
control
of
multi-
step
or
single-step
operations.
162

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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