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IBM 7090 User Manual

IBM 7090
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Indirect
addressing
controls
are
shown
in
Figure
5.2-1.
Once
an
indirect
addressing
condition
is
recognized,
the
IA
control
trigger
is
turned
on
to
block
normal
operations
and
an
E
cycle
is
initiated.
When
the
E
cycle
is
completed,
the
trigger
is
turned
off,
and
normal
execution
is
resumed.
5.3.00
INSTRUCTIONS
5.3.01
Word
Transmission
Instructions*
Word
transmission
instructions
are
necessary
to
move
information
into
and
out of
the
CPU.
Factors
must
be
brought
in
from
core
storage
and
results
must
be
returned.
Instructions
are
available
to
move
parts
of
words
or
whole
words
to
or
from
core
stor-
age.
Store
STO +0601 (I,
E)
Figure
5.3-1
This
instruction
moves
a
full
word
to
core
storage.
The
contents
of
the
AC(S,
1-35)
replace
the
contents
of
storage
location
X.
The
AC
is
unchangedo
The
store
prefix,
decrement,
tag,
address,
and
MF
store
control
lines
are
activated
so
a full
word
can
be
put
into
core
storage.
Store
Logical
Word
SLW +0602 (I,
E)
Figure
5.3-1
This
instruction
replaces
the
contents
of
storage
location
X
with
the
contents
of
the
AC(P-35).
The
AC
is
unchanged.
Execution
of
this
instruction
is
identical
to
that
of
store
except
for
the
routing
of AC(P)
to
the
storage
register
sign
position.
AC(P-35)
is
gated
to
SR(S-35) on
Systems
2.
12.02.
1.
Store
MQ
STQ
-0600
(I,
E)
Figure
5.3-1
The
contents
of
core
storage
location
X
are
replaced
by
the
contents
of
the
MQ(S,
1-35)
register.
The
contents
of
the
MQ
are
unchanged.
This
instruction
operates
similarly
to
store,
except
that
the
word
sent
to
the
SR
comes
from
the
MQ
rather
than
from
the
AC.
Store
Zero
STZ +0600(1, E)
Figure
5.
3-1
This
instruction
causes
zeros
to
be
placed
in
all
positions
of
storage
location
X.
The
operation
of
this
instruction
is
similar
to
store,
except
that
nothing
is
put
on
the
SB.
Therefore
t
when
the
storage
bus
is
gated
to
core
storage,
zeros
are
put
into
that
location
of
storage.
Store
Prefix
STP
+0630 (I, E)
Figure
5.3-2
This
instruction
places
the
contents
of
AC
positions
(P,
1
and
2)
into
core
storage
location
X,
positions
(S, 1 and 2).
The
contents
of
the
AC
and
storage
positions
( 3
through
35)
are
unchanged.
MF
store
prefix
and
MF
store
control
are
activated
to
cause
core
storage
to
store
what
is
on SB(S, 1
and
2).
To
get
the
information
to
the
storage
bus,
it
must
be
moved
from
the
accumulator
to
the
SR.
*See
Store
Location
and
Trap,
and
Figure
5.3-34.
47

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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