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IBM 7090 User Manual

IBM 7090
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Set
Sign
Minus
SSM
-0760
...
0003(1, L)
Figure
5.3-50
This
instruction
places
a
one
(a
minus)
in
the
accumulator
sign
position.
Positions
(Q-35) of
the
accumulator
are
unchanged.
Change
Sign
CHS +0760
...
0002(1, L)
Figure
5.3-51
This
instruction
complements
the
sign
position
of
the
accumulator.
A
one
is
re-
placed
by a
zero
and
a
zero
is
changed
to
a
one.
Positions
(Q-35) of
the
accumulator
are
unchanged.
5.3.
09
Sense
Indicator
Instructions
The
sense
indicator
instructions
are
a
group
of
instructions
which
operate
on
the
sense
indicator
register.
These
instructions
enable
the
computer
to
set
and
test
the
indicators
under
program
control.
Load
Indicators
LDI +0441 (I, E)
Figure
5.3-52
The
contents
of
storage
location
X (S,
1-35)
are
placed
in
indicator
positons
(0-35).
The
contents
of
storage
are
unchanged.
Store
Indicators
STI
+0604(1,
E)
The
contents
of
indicator
positions
(0-35)
replace
the
contents
of
storage
location
X.
The
indicators
are
unchanged.
Execution
of
this
instruction
is
the
same
as
STO
(Figure
3.5-1,
Section
3.5.01)
except
that
SI(0-35)
is
taken
to
the
SR
rather
than
AC
(S',
1-35).
SI(0-35)
to
the
SR(S,
1-35)
is
shown
on
Systems
2.12.13.1.
OR
Storage
to
Indicators
OSI
+0442(I,E)
Figure
5.
3-52
This
instruction
places
the
logical
OR
of
the
word
at
storage
location
X
and
the
contents
of
the
indicators
in
the
sense
indicator
register.
Storage
is
unchanged.
Invert
Indicators
from
Storage
lIS +0440(1, E)
Figure
5.
3-52
This
instruction
inverts
the
positions
of
the
SI
register
which
have
corresponding
"1"
bits
in
the
word
at
storage
location
X.
Reset
Indicators
from
Storage
RIS +0445 (I, E)
Figure
5.3-53
This
instruction
utilizes
the
word
at
storage
location
X
to
reset
the
sense
indicator
register
position.
A
"1"
bit
in
any
position
of
the
word
causes
the
corresponding
sense
indicator
trigger
to
be
turned
off.
Indicator
positions
which
correspond
to
"0"
bits
are
unchanged.
Storage
is
unchanged.
Set
Indicators
of
Right
Half
SIR +0055(1)
Figure
5.3-54
For
this
instruction,
the
control
field
(18-35)
of
the
instruction
is
OR led
with
the
right
half
of
the
sense
indicator
register.
A
"1"
bit
in
either
the
control
field
or
the
indicator
places
a
"1"
bit
in
the
corresponding
sense
indicator.
Because
the
only
111

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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