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IBM 7090 User Manual

IBM 7090
190 pages
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Storage
table
required
for
CRQ
(in
decimal):
Storage
Contents
Location
(
S-5)
(
21-35)
2000
BL
2000
2001 1
2010
2002
2
2010
2003
3
2010
2004
4
2010
2005
5 2010
2006
6
2010
2007
7
2010
2008
8
2010
2009
9
2010
Development
of
Program
LDQ A
CRQ
2000,
0,
6
Series
of
Steps
within
CRQ
1st
Char
Conv
Sl-5
*0
Storage
Contents
Location
(S-5)
(21-35)
2010
0
2010
2011
1
2010
2012
2
2010
2013
3
2010
2014
4 2010
2015
5
2010
2016
6
2010
2017
7
2010
2018
8
2010
2019
9
2010
CONTENTS
OF
MQ
6-11
12-17
-23
-35
MQ
Shift
Left
6
Table
Next
Count
C(MQ)s
Start
Table
C(-)s
Starting
Loc
1-5
Loc
Refer
1-5
C(-)
21-35
*0
+
2000
=
2000
BL
2000
0 9
BL
5
0
+
2000
= 2000
BL
2000
7
+
2000
=
2007
7
2010
1
+
2010
= 2011
1
2010
0
+
2010
= 2010
0
9
+
2010
= 2019
9
9
";'BL}..BL
4
BL:;"BL¥
7
3
B~7~1
2
7~lyO
1
109
0
Count
=
0;
if
Tag
=
1,
XRA
The
execution
of
CRQ
is
accomplished
in
one
L
cycle
and
a
number
of
E
cycles
equal
to
the
count.
Convert
by
Addition
from
MQ
CAQ
-0114(Min
I,
L)
Figure
5.3-73
(Max
I,
L,
6E)
This
instruction
treats
the
MQ
as
six
6-bit
representations,
as
does
CRQ.
This
instruction
does
not
replace
any
of
these
representations,
but
uses
them
to
locate
a
number
of
storage
words
equal
to
the
count
of
the
instruction.
The
storage
words
are
located
at
the
address
developed
by
adding
MQ(S-5)
to
SR(21-35)
(initially
the
instruc-
tion
address)
and
are
brought
to
the
SR.
The
storage
words
are
then
added
to
the
contents
of
the
accumulator.
The
MQ
is
not
replaced,
but
is
merely
rotated
left
six
places
to
allow
the
next
six-bit
representation
to
be
added
to
the
address
portion
of
the
previous
storage
word.
The
process
continues
until
a
number
of
additions
(to
the
AC)
equal
to
the
count
have
been
made.
The
operation
is
then
complete.
The
address
por-
tion
of
the
last
storage
word
used
can
be
stored
in
index
registers
for
future
reference
by
adding
a
tag
bit
in
position
20 of
the
instruction.
137

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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