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IBM 7090 User Manual

IBM 7090
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OR
Accumulator
to
Indicators
OAI +0043
(I)
Figure
5.3-55
The
logical
OR of
the
contents
of
the
accumulator
(P,
1-35)
and
the
indicators
is
placed
in
the
sense
indicator
register.
If
a
position
in
either
register
contains
a
one,
a
one
will
be
placed
in
that
position
of
the
indicator.
The
accumulator
is
unchanged.
Exe-
cution
is
accomplished
using
the
sequence
of
PAl
but
omitting
the
indicator
reset.
Reset
Indicators
from
Accumulator
RIA
-0042 (I)
Figure
5.3-55
The
positions
of
the
sense
indicator
register
which
correspond
to
the
positions
of
the
AC
(P,
1-35)
having
"1"
bits
are
reset
to
zero.
Indicator
positions
which
correspond
to
"0"
bits
are
unchanged.
The
AC
is
unchanged.
Invert
Indicator
s
from
Accumulator
IIA
+0041 (I)
Figure
5.3-55
This
instruction
inverts
any
sense
indicator
position
for
which
there
is
a
corre-
sponding
"1"
bit
in
the
accumulator
(P,
1-35).
Transfer
if
Indicators
On
TIO +0042
(1,
L)
Figure
5.3-56
If
all
of
the
ones
in
the
AC
are
matched
by
ones
in
the
indicator
register,
an
instruc-
tion
transfer
is
taken
to
location
X.
AC
positions
containing
zeros
are
not
compared
with
indicator
positions.
If
all
of
the
ones
are
not
matched,
the
computer
takes
the
next
instruction
in
sequence.
To
execute
this
instruction,
the
complement
of
the
AC
is
OR'ed
with
the
indicator.
If
the
ones
match,
the
result
will
be
all
ones.
The
result
of
the
OR
is
stored
in
the
SR and fed
to
the
adder.
A
carry
to
adder
(35)
will
ripple
down
the
adder
and
carry
out of
the
AD(P).
The
adder
(P)
carry
is
used
to
condition
the
transfer.
Transfer
if
Indicators
Off
TIF
+0046 (1, L)
Figure
5.3-56
If
all
of
the
ones
in
the
AC
are
matched
by
zeros
in
the
indicator
register,
an
instruc-
tion
transfer
is
taken
to
location
X.
AC
positions
containing
zeros
are
not
compared
with
indicator
positions.
If
all
of
the
ones
are
not
matched,
the
computer
takes
the
next
instruction
in
sequence.
Execution
of
this
instruction
is
identical
to
that
of TIO,
except
that
the
complement
of
the
indicators
is
OR'ed
to
the
complement
of
the
AC.
Test
procedure
remains
the
same.
On
Test
for
Indicators
ONT +0446 (I,
E,
2L)
Figure
5.3-57
If
the
ones
contained
in
the
word
stored
at
location
X
are
matched
by
ones
in
the
corresponding
indicator
register
positions,
the
next
instruction
will
be
skipped.
If
all
of
the
ones
are
not
matched,
the
computer
will
take
the
next
instruction
in
sequence.
Positions
of
storage
location
X
which
contain
zeros
are
not
compared.
Execution
of
this
instruction
requires
an
E
cycle
to
obtain
the
test
word
from
storage
and two L
cycles
to
complete
the
test.
The
test
is
accomplished
by
moving
the
test
word
to
the
accumulator,
where
it
can
be
complemented.
The
complement
is
OR
'ed
with
the
in-
dicators
and
returned
to
the
SR.
The
result
of
the
OR
will
be
all
ones
if
the
ones
in
the
test
word
match
the
indicator.
To
test
for
all
ones
a
carry
is
added
to
the
OR which
will
result
in
an
adder
(P)
carry
to
condition
the
advance
instruction
counter.
The
contents
of
the
accumulator
are
saved
and
restored
to
normal
during
execution
of
the
instruction.
116

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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