<s>
The	O
University	B-Application
of	I-Application
Michigan	I-Application
Executive	I-Application
System	I-Application
,	O
or	O
UMES	O
,	O
a	O
batch	B-General_Concept
operating	B-General_Concept
system	I-General_Concept
developed	O
at	O
the	O
University	O
of	O
Michigan	O
in	O
1958	O
,	O
was	O
widely	O
used	O
at	O
many	O
universities	O
.	O
</s>
<s>
Based	O
on	O
the	O
General	B-Application
Motors	I-Application
Executive	I-Application
System	I-Application
for	O
the	O
IBM	B-Device
701	I-Device
,	O
UMES	O
was	O
revised	O
to	O
work	O
on	O
the	O
mainframe	O
computers	O
in	O
use	O
at	O
the	O
University	O
of	O
Michigan	O
during	O
this	O
time	O
(	O
IBM	B-Device
704	I-Device
,	O
709	B-Device
,	O
and	O
7090	B-Device
)	O
and	O
to	O
work	O
better	O
for	O
the	O
small	O
student	O
jobs	O
that	O
were	O
expected	O
to	O
be	O
the	O
primary	O
work	O
load	O
at	O
the	O
University	O
.	O
</s>
<s>
UMES	O
was	O
in	O
use	O
at	O
the	O
University	O
of	O
Michigan	O
until	O
1967	O
,	O
when	O
MTS	B-Application
was	O
phased	O
in	O
to	O
take	O
advantage	O
of	O
the	O
newer	O
virtual	B-Architecture
memory	I-Architecture
time-sharing	B-General_Concept
technology	O
that	O
became	O
available	O
on	O
the	O
IBM	B-Device
System/360	I-Device
Model	I-Device
67	I-Device
.	O
</s>
