<s>
The	O
IBM	B-Device
System/370	I-Device
Model	I-Device
168	I-Device
and	O
Model	O
158	O
were	O
both	O
announced	O
on	O
August	O
2	O
,	O
1972	O
.	O
</s>
<s>
Main	O
memory	O
,	O
which	O
was	O
four-way	O
doubleword	O
interleaved	B-General_Concept
,	O
could	O
be	O
1	O
to	O
8	O
megabytes	O
,	O
with	O
offerings	O
selectable	O
in	O
increments	O
of	O
one	O
megabyte	O
.	O
</s>
<s>
The	O
Model	O
168	O
used	O
semiconductor	B-Architecture
memory	I-Architecture
,	O
rather	O
than	O
the	O
magnetic-core	O
memory	O
used	O
by	O
the	O
370/165	B-Device
introduced	O
2	O
years	O
prior	O
,	O
resulting	O
in	O
a	O
system	O
that	O
was	O
faster	O
and	O
physically	O
smaller	O
than	O
a	O
Model	O
165	O
.	O
</s>
<s>
as	O
with	O
the	O
165	O
's	O
Model	O
1	O
,	O
had	O
a	O
microfiche	O
document	O
viewer	O
,	O
a	O
feature	O
introduced	O
for	O
the	O
360/85	B-Device
'	O
s	O
console	B-Device
.	O
</s>
<s>
A	O
console	B-Device
printer	O
(	O
up	O
to	O
85	O
characters	O
per	O
second	O
)	O
to	O
provide	O
hard	O
copy	O
was	O
optional	O
when	O
the	O
console	B-Device
was	O
in	O
display	O
mode	O
,	O
and	O
required	O
when	O
it	O
was	O
in	O
printer-keyboard	O
mode	O
.	O
</s>
<s>
The	O
newly	O
introduced	O
Model	O
11	O
of	O
IBM	O
's	O
3330	B-Device
family	O
of	O
disk	O
drives	O
,	O
featuring	O
removable	O
disk	O
packs	O
,	O
has	O
double	O
the	O
capacity	O
of	O
the	O
prior	O
100-megabyte	O
offerings	O
.	O
</s>
<s>
It	O
ca	O
n't	O
be	O
attached	O
to	O
a	O
370/165	B-Device
.	O
</s>
<s>
Both	O
the	O
370/168	O
and	O
the	O
370/158	O
had	O
MP	O
(	O
multiprocessing	B-Operating_System
)	O
models	O
that	O
offered	O
"	O
tightly	O
coupled	O
multiprocessing	B-Operating_System
.	O
</s>
<s>
The	O
168	O
was	O
described	O
as	O
having	O
"	O
two	O
types	O
of	O
multiprocessing	B-Operating_System
support	O
"	O
since	O
it	O
also	O
offered	O
attaching	O
a	O
second	O
processing	O
unit	O
,	O
an	O
IBM	O
3062	O
Attached	O
Processing	O
Unit	O
,	O
which	O
lacked	O
access	O
to	O
Input/Output	O
channels	O
.	O
</s>
<s>
The	O
optional	O
IBM	O
7070/7074	O
Compatibility	O
Feature	O
allowed	O
the	O
168	O
to	O
"	O
run	O
7070	B-Device
and	O
7074	B-Device
programs	O
at	O
speeds	O
that	O
,	O
in	O
general	O
,	O
equal	O
or	O
exceed	O
those	O
of	O
the	O
original	O
systems	O
"	O
and	O
yet	O
"	O
not	O
affect	O
normal	O
operation	O
of	O
System/370.	O
"	O
</s>
<s>
IBM	O
referred	O
to	O
the	O
System/370	B-Device
Model	O
168-3	O
as	O
"	O
the	O
company	O
's	O
...	O
</s>
