<s>
The	O
IBM	B-Device
System/360	I-Device
Model	I-Device
65	I-Device
is	O
a	O
member	O
of	O
the	O
IBM	B-Application
System/360	I-Application
family	O
of	O
computers	O
.	O
</s>
<s>
There	O
are	O
six	O
submodels	O
of	O
the	O
S/360	B-Application
-65	O
.	O
</s>
<s>
The	O
MP	O
(	O
multiprocessor	B-Operating_System
)	O
model	O
was	O
added	O
supporting	O
from	O
512K	O
to	O
2MB	O
of	O
system	O
memory	O
.	O
</s>
<s>
The	O
system	O
can	O
also	O
attach	O
IBM	B-Device
2361	I-Device
Large	I-Device
Capacity	I-Device
Storage	I-Device
(	O
LCS	O
)	O
modules	O
which	O
provide	O
up	O
to	O
8MB	O
of	O
additional	O
storage	O
,	O
however	O
with	O
a	O
considerably	O
slower	O
memory	O
cycle	O
time	O
of	O
8	O
microseconds	O
compared	O
to	O
the	O
750	O
nanoseconds	O
of	O
processor	O
storage	O
.	O
</s>
<s>
The	O
performance	O
of	O
the	O
Model	O
65	O
is	O
more	O
than	O
triple	O
that	O
of	O
a	O
S/360	B-Device
-50	I-Device
,	O
whereas	O
the	O
Model	O
75	O
,	O
the	O
next	O
step	O
up	O
,	O
was	O
less	O
than	O
double	O
that	O
of	O
a	O
S/360	B-Application
-65	O
.	O
</s>
<s>
The	O
Model	O
65	O
implements	O
the	O
complete	O
System/360	B-Device
"	I-Device
universal	I-Device
instruction	I-Device
set	I-Device
"	I-Device
architecture	I-Device
,	O
including	O
floating-point	O
,	O
decimal	O
,	O
and	O
character	O
operations	O
as	O
standard	O
features	O
.	O
</s>
<s>
It	O
offers	O
optional	O
compatibility	O
features	O
to	O
permit	O
emulation	B-Application
of	O
the	O
IBM	B-Device
7040	I-Device
and	I-Device
7044	I-Device
and	O
the	O
IBM	B-Device
7090	I-Device
and	I-Device
7094	I-Device
,	O
the	O
IBM	B-Device
7070	I-Device
and	I-Device
7074	I-Device
,	O
and	O
the	O
IBM	B-Device
7080	I-Device
.	O
</s>
<s>
Main	O
memory	O
in	O
the	O
Model	O
65	O
can	O
be	O
interleaved	B-General_Concept
for	O
faster	O
access	O
.	O
</s>
<s>
The	O
Model	O
65	O
,	O
like	O
the	O
Model	B-Device
67	I-Device
,	O
was	O
available	O
in	O
a	O
dual-CPU	O
offering	O
.	O
</s>
<s>
Multi-processing	B-Operating_System
(	O
Dual-CPU	O
)	O
systems	O
have	O
two	O
I65s	O
,	O
IH65s	O
or	O
J65s	O
,	O
and	O
"	O
the	O
main	O
storage	O
of	O
each	O
processing	O
unit	O
is	O
accessible	O
to	O
the	O
other.	O
"	O
</s>
<s>
The	O
Model	O
65	O
supports	O
BPS	B-Application
,	O
DOS/360	O
,	O
TOS/360	B-Application
,	O
and	O
OS/360	B-Application
-	O
PCP	O
,	O
MFT	O
and	O
MVT	O
.	O
</s>
<s>
The	O
Model	O
65MP	O
implements	O
asymmetric	B-Operating_System
multiprocessing	I-Operating_System
:	O
"	O
certain	O
input	O
output	O
equipment	O
is	O
accessible	O
from	O
only	O
one	O
processor.	O
"	O
</s>
<s>
Time-sharing	B-General_Concept
can	O
be	O
provided	O
on	O
a	O
Model	O
65	O
using	O
IBM	O
's	O
Time	B-Application
Sharing	I-Application
Option	I-Application
(	O
TSO	O
)	O
.	O
</s>
