<s>
The	O
IBM	B-Device
7080	I-Device
was	O
a	O
variable	O
word	O
length	O
BCD	O
transistor	B-Device
computer	I-Device
in	O
the	O
IBM	B-Device
700/7000	I-Device
series	I-Device
commercial	O
architecture	O
line	O
,	O
introduced	O
in	O
August	O
1961	O
,	O
that	O
provided	O
an	O
upgrade	O
path	O
from	O
the	O
vacuum	O
tube	O
IBM	B-Device
705	I-Device
computer	O
.	O
</s>
<s>
After	O
the	O
introduction	O
of	O
the	O
IBM	B-Device
7070	I-Device
,	O
in	O
June	O
1960	O
,	O
as	O
an	O
upgrade	O
path	O
for	O
both	O
the	O
IBM	B-Device
650	I-Device
and	O
IBM	B-Device
705	I-Device
computers	O
,	O
IBM	O
realized	O
that	O
it	O
was	O
so	O
incompatible	O
with	O
the	O
705	O
that	O
few	O
users	O
of	O
that	O
system	O
wanted	O
to	O
upgrade	O
to	O
the	O
7070	O
.	O
</s>
<s>
For	O
backward	B-General_Concept
compatibility	I-General_Concept
with	O
the	O
IBM	B-Device
705	I-Device
the	O
machine	O
had	O
two	O
switches	O
on	O
the	O
operator	O
's	O
control	O
panel	O
,	O
705	O
I-II	O
and	O
40K	O
memory	O
,	O
that	O
selected	O
the	O
mode	O
the	O
machine	O
started	O
in	O
.	O
</s>
<s>
The	O
IBM	O
7622	O
Signal	O
Control	O
unit	O
could	O
be	O
added	O
to	O
the	O
system	O
to	O
convert	O
transistor	O
signal	O
levels	O
to	O
levels	O
usable	O
with	O
first	O
generation	O
equipment	O
,	O
allowing	O
all	O
705	O
peripherals	O
,	O
including	O
punched	B-Device
card	I-Device
input/output	I-Device
with	O
the	O
IBM	O
7502	O
card	B-Device
reader	I-Device
,	O
line	O
printers	O
and	O
the	O
IBM	B-Device
727	I-Device
magnetic	O
tape	O
drives	O
,	O
to	O
be	O
used	O
on	O
the	O
7080	O
.	O
</s>
<s>
Second	O
generation	O
IBM	B-Device
729	I-Device
magnetic	O
tape	O
drives	O
connected	O
to	O
the	O
CPU	O
via	O
the	O
IBM	O
7621	O
Tape	O
Control	O
.	O
</s>
