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IBM 7090 User Manual

IBM 7090
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Off
Test
for
Indicators
OFT
+0444 (I,
E,
L,
L)
Figure
5.3-57
If
the
ones
contained
in
the
word
stored
at
location
X
are
matched
by
zeros
in
the
corresponding
indicator
positions,
the
computer
will
skip
one
instruction.
If
all
of
the
ones
are
not
matched
by
zeros,
the
computer
will
take
the
next
instruction
in
sequence.
Positions
in
the
test
word
from
storage
which
contain
zeros
are
not
compared.
Execu-
tion
of
this
instruction
is
identical
to
that
of
ONT,
except
that
the
complement
of
the
indicator
is
used
for
the
OR
operation
instead
of
the
true
indicator.
Right-Half
Indicators,
On
Test
RNT
+0056 (I,
L,
L)
Figure
5.3-58
This
instruction
matches
the
ones
in
the
control
field
(18-35) of
the
instruction
against
the
corresponding
positions
of
the
right
half
of
the
indicator
register.
If
all
of
the
ones
are
matched
by
ones,
the
computer
skips
one
instruction.
If
all
are
not
matched,
the
computer
takes
the
next
instruction
in
sequence.
Positions
of
the
control
field
containing
zeros
are
not
compared.
Execution
of
this
instruction
is
the
same
as
ONT
except
that
only
positions
(18-35)
of SR
are
used.
Left-Half
Indicators,
On
Test
LNT
-0056
(I,
L,
L)
Figure
5.3-58
If
the
ones
in
the
control
field
of
the
instruction
are
matched
by
ones
in
the
corre-
sponding
positions
of
the
left
half
of
the
indicator
regi
ster,
the
computer
will
skip
the
next
instruction.
If
all
ones
are
not
matched,
the
computer
takes
the
next
instruction
in
sequence.
Execution
of
this
instruction
is
the
same
as
ONT,
except
that
the
SR
(18 -35)
is
compared
against
SI(0-17).
Right-Half
Indicators,
Off
Test
-
RFT
+0054 (I,
L,
L)
Figure
5.3-58
If
the
ones
in
the
control
field
of
this
instruction
are
matched
by
zeros
in
the
right
half
of
the
indicator
register,
the
computer
will
skip
one
instruction.
If
all
ones
are
not
matched
by
zeros,
the
computer
will
take
the
next
instruction
in
sequence.
Posi-
tions
of
the
control
field
containing
zeros
are
not
compared.
This
instruction
is
exe-
cuted
the
same
as
OFT,
except
that
only
positions
(18-35)
of
the
SR
are
used.
Left-Half
Indicators,
Off
Test
LFT
-0054
(I,
L,
L)
Figure
5.3-58
If
the
ones
in
the
control
field
of
this
instruction
are
matched
by
zeros
in
the
left
half
of
the
indicator
register,
the
computer
will
skip
one
instruction.
If
all
are
not
matched,
the
computer
will
take
the
next
instruction
in
sequence.
Positions
of
the
control
field
containing
zeros
are
not
compared.
The
control
field
and
the
indicator
register
are
unchanged.
Execution
of
this
instruction
is
the
same
as
OFT,
except
that
SR(18-35)
is
compared
with
SI(0-17).
5.3.10
Index
Transmission
Instructions
These
are
the
instructions
which
operate
on
or
with
the
index
registers.
They
are
used
to
load
or
modify
the
index
registers,
to
alter
instructions
from
the
index
regis-
ters,
or
to
control
program
flow.
There
are
three
shift
cell
index
registers
containing
15
positions
each.
The
tag
bit
positions
(18-20)
of
the
instruction
control
which
index
registers
are
to
be
used.
Any
119

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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