<s>
The	O
IBM	B-Device
System/360	I-Device
Model	I-Device
75	I-Device
is	O
a	O
discontinued	O
high	O
end/high	O
performance	O
system	O
that	O
was	O
introduced	O
on	O
April	O
22	O
,	O
1965	O
.	O
</s>
<s>
Although	O
it	O
played	O
many	O
roles	O
in	O
IBM	O
's	O
System/360	B-Application
lineup	O
,	O
it	O
accounted	O
for	O
a	O
small	O
fraction	O
of	O
a	O
percent	O
of	O
the	O
360	O
systems	O
sold	O
.	O
</s>
<s>
Three	O
models	O
,	O
the	O
H75	O
,	O
I75	O
,	O
and	O
J75	O
,	O
were	O
respectively	O
configured	O
with	O
one	O
,	O
two	O
,	O
or	O
four	O
IBM	B-Device
2365	I-Device
Model	O
3	O
Processor	O
Storage	O
units	O
,	O
each	O
of	O
which	O
provided	O
262,144	O
(	O
256K	O
)	O
bytes	O
of	O
core	O
memory	O
,	O
so	O
that	O
the	O
H75	O
had	O
262,144	O
(	O
256K	O
)	O
bytes	O
of	O
core	O
,	O
the	O
I75	O
had	O
524,288	O
(	O
512K	O
)	O
,	O
and	O
the	O
J75	O
1,048,576	O
(	O
1MB	O
)	O
.	O
</s>
<s>
Furthermore	O
,	O
independent	O
storage	O
sections	O
provided	O
two-way	O
(	O
H75	O
)	O
or	O
four-way	O
(	O
I75	O
,	O
J75	O
)	O
interleaving	B-General_Concept
of	I-General_Concept
memory	I-General_Concept
access	I-General_Concept
.	O
</s>
<s>
The	O
Model	O
75	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>
