<s>
The	O
Univac	B-Device
Series	I-Device
90	I-Device
is	O
an	O
obsolete	O
family	O
of	O
mainframe	O
class	O
computer	O
systems	O
from	O
UNIVAC	O
first	O
introduced	O
in	O
1973	O
.	O
</s>
<s>
The	O
90/60	O
through	O
90/80	O
systems	O
all	O
ran	O
the	O
Univac	O
’s	O
virtual	B-Operating_System
memory	I-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
VS/9	O
.	O
</s>
<s>
The	O
Series	O
90	O
systems	O
were	O
the	O
replacement	O
for	O
the	O
UNIVAC	B-Device
9000	I-Device
series	I-Device
of	O
low	O
end	O
,	O
mainframe	O
systems	O
marketed	O
by	O
Sperry	O
Univac	O
during	O
the	O
1960s	O
.	O
</s>
<s>
The	O
9000	O
series	O
systems	O
were	O
byte-addressable	O
machines	O
with	O
an	O
instruction	O
set	O
that	O
was	O
compatible	O
with	O
the	O
IBM	B-Application
System/360	I-Application
.	O
</s>
<s>
This	O
system	O
was	O
loaded	O
from	O
cards	B-Architecture
,	O
but	O
thereafter	O
also	O
supported	O
magnetic	O
tape	O
or	O
magnetic	B-Architecture
disk	I-Architecture
for	O
programs	O
and	O
data	O
.	O
</s>
<s>
They	O
were	O
also	O
developing	O
a	O
new	O
real	O
memory	O
operating	O
system	O
for	O
the	O
9700	O
called	O
OS/7	B-Operating_System
.	O
</s>
<s>
In	O
January	O
1972	O
,	O
Sperry	O
officially	O
took	O
over	O
the	O
RCA	O
customer	O
base	O
,	O
offering	O
the	O
Spectra	B-Device
70	I-Device
and	O
RCA	O
Series	O
computers	O
as	O
the	O
UNIVAC	B-Device
Series	I-Device
70	I-Device
.	O
</s>
<s>
They	O
cancelled	O
development	O
of	O
OS/7	B-Operating_System
in	O
favor	O
of	O
VS/9	O
,	O
a	O
renamed	O
RCA	O
VMOS	B-Operating_System
.	O
</s>
<s>
Sperry	O
also	O
offered	O
their	O
own	O
1100	B-Device
family	I-Device
of	O
systems	O
and	O
the	O
1100/60	O
provided	O
an	O
entry	O
level	O
system	O
for	O
converting	O
the	O
Series	O
90	O
customer	O
base	O
.	O
</s>
<s>
The	O
Series	O
90	O
Systems	O
suffered	O
from	O
pressure	O
from	O
the	O
IBM	B-Device
4300	I-Device
series	I-Device
systems	O
that	O
offered	O
superior	O
price	O
performance	O
and	O
may	O
have	O
induced	O
Sperry	O
to	O
concentrate	O
on	O
the	O
1100	O
.	O
</s>
<s>
In	O
a	O
short	O
time	O
Digital	O
Equipment	O
Corporation	O
,	O
with	O
their	O
flagship	O
VAX	B-Device
line	O
of	O
midrange	O
computers	O
would	O
pass	O
Sperry	O
in	O
terms	O
of	O
total	O
revenue	O
to	O
become	O
the	O
number	O
two	O
U.S.	O
computer	O
manufacturer	O
after	O
IBM	O
.	O
</s>
