<s>
IBM	O
7070	O
is	O
a	O
decimal-architecture	B-Device
intermediate	O
data-processing	O
system	O
that	O
was	O
introduced	O
by	O
IBM	O
in	O
1958	O
.	O
</s>
<s>
It	O
was	O
part	O
of	O
the	O
IBM	B-Device
700/7000	I-Device
series	I-Device
,	O
and	O
was	O
based	O
on	O
discrete	O
transistors	B-Application
rather	O
than	O
the	O
vacuum	O
tubes	O
of	O
the	O
1950s	O
.	O
</s>
<s>
The	O
7070	O
was	O
expected	O
to	O
be	O
a	O
"	O
common	O
successor	O
to	O
at	O
least	O
the	O
650	B-Device
and	O
the	O
705	O
"	O
.	O
</s>
<s>
The	O
7070	O
was	O
not	O
designed	O
to	O
be	O
instruction	O
set	O
compatible	O
with	O
the	O
650	B-Device
,	O
as	O
the	O
latter	O
had	O
a	O
second	O
jump	O
address	O
in	O
every	O
instruction	O
to	O
allow	O
optimal	O
use	O
of	O
the	O
drum	O
,	O
something	O
unnecessary	O
and	O
wasteful	O
in	O
a	O
computer	O
with	O
random-access	O
core	B-General_Concept
memory	I-General_Concept
.	O
</s>
<s>
The	O
7070	O
was	O
also	O
marketed	O
as	O
an	O
IBM	B-Device
705	I-Device
upgrade	O
,	O
but	O
failed	O
miserably	O
due	O
to	O
its	O
incompatibilities	O
,	O
including	O
an	O
inability	O
to	O
fully	O
represent	O
the	O
705	O
character	O
set	O
;	O
forcing	O
IBM	O
to	O
quickly	O
introduce	O
the	O
IBM	B-Device
7080	I-Device
as	O
a	O
"	O
transistorized	O
IBM	B-Device
705	I-Device
"	O
that	O
was	O
fully	O
compatible	O
.	O
</s>
<s>
The	O
machine	O
shipped	O
with	O
5,000	O
or	O
9,990	O
words	O
of	O
core	B-General_Concept
memory	I-General_Concept
and	O
the	O
CPU	O
speed	O
was	O
about	O
27KIPS	O
.	O
</s>
<s>
and	O
the	O
IBM	O
7072	O
(	O
1961	O
)	O
,	O
a	O
less	O
expensive	O
system	O
using	O
the	O
slower	O
7330	B-Device
instead	O
of	O
729	B-Device
tape	O
drives	O
.	O
</s>
<s>
They	O
were	O
eventually	O
replaced	O
by	O
the	O
System/360	B-Application
,	O
announced	O
in	O
1964	O
.	O
</s>
<s>
The	O
7070	O
was	O
implemented	O
using	O
both	O
CTDL	O
(	O
in	O
the	O
logic	O
and	O
control	O
sections	O
)	O
and	O
current-mode	B-General_Concept
logic	I-General_Concept
(	O
in	O
the	O
timing	O
storage	O
and	O
core	O
storage	O
sections	O
)	O
on	O
Standard	B-Device
Modular	I-Device
System	I-Device
(	O
SMS	O
)	O
cards	O
.	O
</s>
<s>
A	O
total	O
of	O
about	O
30,000	O
alloy-junction	O
germanium	O
transistors	B-Application
and	O
22,000	O
germanium	O
diodes	O
are	O
used	O
,	O
on	O
approximately	O
14,000	O
SMS	O
cards	O
.	O
</s>
<s>
including	O
up	O
to	O
1	O
7150	O
console	O
typewriter	O
,	O
4	O
7300	B-Device
Disk-Storage	O
units	O
attached	O
to	O
an	O
IBM	O
7604	O
Tape	O
Control	O
via	O
an	O
IBM	O
7605	O
RAMAC	O
Control	O
,	O
40	O
729	B-Device
models	O
II	O
and	O
IV	O
tape	O
drives	O
attached	O
to	O
an	O
IBM	O
7604	O
Tape	O
Control	O
,	O
and	O
6	O
(	O
3	O
input	O
,	O
3	O
output	O
)	O
unit	O
record	O
devices	O
attached	O
to	O
an	O
IBM	O
7603	O
Input/Output	O
Synchronizer	O
via	O
an	O
IBM	O
7600	O
Input/Output	O
control	O
.	O
</s>
<s>
Ten	O
729	B-Device
tape	O
drives	O
can	O
be	O
attached	O
to	O
each	O
of	O
4	O
I/O	O
channels	O
.	O
</s>
<s>
Four	O
7300	B-Device
disk	O
drives	O
can	O
be	O
attached	O
to	O
the	O
first	O
two	O
channels	O
.	O
</s>
<s>
The	O
IBM	B-Device
729	I-Device
is	O
a	O
7-track	O
tape	O
drive	O
common	O
to	O
most	O
of	O
the	O
IBM	O
14xx	B-Device
and	O
70xx	B-Device
computers	O
.	O
</s>
<s>
The	O
models	O
II	O
and	O
IV	O
normally	O
record	O
at	O
556	O
BPI	O
,	O
but	O
they	O
support	O
200	O
BPI	O
for	O
compatibility	O
with	O
the	O
older	O
IBM	B-Device
727	I-Device
and	O
729	B-Device
model	O
I	O
.	O
</s>
<s>
The	O
729	B-Device
is	O
not	O
used	O
on	O
the	O
7072	O
.	O
</s>
<s>
The	O
7151	O
console	O
card	O
reader	O
is	O
a	O
modified	O
keypunch	B-Device
that	O
can	O
only	O
read	O
.	O
</s>
<s>
The	O
IBM	B-Device
7300	I-Device
Disk	O
Storage	O
Unit	O
has	O
a	O
capacity	O
of	O
6	O
million	O
digits	O
.	O
</s>
<s>
The	O
IBM	B-Device
1301	I-Device
replaced	O
it	O
in	O
1961	O
.	O
</s>
<s>
The	O
IBM	B-Device
7330	I-Device
is	O
a	O
slower	O
,	O
less	O
expensive	O
,	O
alternative	O
to	O
the	O
729	B-Device
;	O
it	O
is	O
not	O
used	O
on	O
the	O
7070	O
or	O
7074	O
.	O
</s>
<s>
Like	O
the	O
729	B-Device
II	O
and	O
IV	O
,	O
the	O
7330	B-Device
supports	O
dual	O
(	O
200	O
BPI/556	O
BPI	O
)	O
density	O
.	O
</s>
<s>
IBM	B-Device
7300	I-Device
Disk	O
Storage	O
Units	O
.	O
</s>
<s>
In	O
1963	O
,	O
IBM	O
announced	O
the	O
IBM	B-Device
1302	I-Device
,	O
with	O
quadruple	O
the	O
capacity	O
of	O
the	O
1301	O
.	O
</s>
<s>
In	O
1961	O
,	O
IBM	O
announced	O
the	O
IBM	B-Device
7340	I-Device
Hypertape	O
.	O
</s>
