<s>
The	O
IBM	B-Device
4300	I-Device
series	I-Device
are	O
mid-range	O
systems	O
compatible	O
with	O
System/370	B-Device
that	O
were	O
sold	O
from	O
1979	O
through	O
1992	O
.	O
</s>
<s>
They	O
had	O
a	O
disruptive	O
effect	O
on	O
the	O
market	O
,	O
allowing	O
customers	O
to	O
provide	O
internal	O
IBM	O
computing	O
services	O
at	O
a	O
cost	O
point	O
lower	O
than	O
commercial	O
time-sharing	B-General_Concept
services	O
.	O
</s>
<s>
All	O
4300	O
processors	O
used	O
a	O
3278-2A	O
,	O
3279-C	O
or	O
3205	O
display	O
console	O
rather	O
than	O
a	O
3210	O
or	O
3215	O
keyboard/printer	O
console	O
.	O
</s>
<s>
They	O
were	O
positioned	O
between	O
the	O
IBM	B-Device
9370	I-Device
and	O
IBM	B-Device
3090	I-Device
in	O
performance	O
at	O
the	O
time	O
of	O
announcement	O
.	O
</s>
<s>
The	O
4381-3	O
,	O
4381-14	O
,	O
4381-24	O
and	O
4381-92	O
are	O
dual-CPU	B-Operating_System
models	O
.	O
</s>
<s>
It	O
came	O
with	O
an	O
integrated	O
adapter	O
that	O
permitted	O
attaching	O
up	O
to	O
16	O
of	O
two	O
newly	O
introduced	O
direct-access	B-Application
storage	I-Application
devices	I-Application
(	O
DASD	B-Application
)	O
:	O
</s>
<s>
Like	O
the	O
4331	O
,	O
it	O
came	O
with	O
an	O
integrated	O
adapter	O
that	O
permitted	O
attaching	O
up	O
to	O
16	O
of	O
the	O
newly	O
introduced	O
IBM	O
3370	O
DASD	B-Application
.	O
</s>
<s>
The	O
4341	O
Introduced	O
the	O
Extended	O
Control	O
Program	O
Support:VM	O
(	O
ECPS:VM	O
)	O
,	O
Extended	O
Control	O
Program	O
Support:VS1	O
(	O
ECPS:VS1	O
)	O
and	O
Extended	O
Control	O
Program	O
Support:Virtual	O
Storage	O
Extended	O
(	O
ECPS:VSE	O
)	O
features	O
.	O
</s>
<s>
The	O
4341-2	O
introduced	O
the	O
Extended	O
Control	O
Program	O
Support	O
(	O
ECPS:MVS	O
)	O
option	O
,	O
a	O
subset	O
of	O
System/370	B-Device
extended	O
facility	O
.	O
</s>
<s>
A	O
Workstation	O
Adapter	O
that	O
includes	O
support	O
for	O
terminals	O
with	O
APL	B-Language
keyboards	O
,	O
supporting	O
the	O
APL	B-Language
syntax	I-Language
and	I-Language
symbols	I-Language
.	O
</s>
<s>
While	O
Floating-Point	B-Algorithm
Arithmetic	I-Algorithm
capability	O
has	O
long	O
been	O
part	O
of	O
computing	O
history	O
,	O
and	O
was	O
present	O
in	O
System/360	B-Application
,	O
this	O
feature	O
's	O
advancement	O
,	O
conceptualization	O
of	O
which	O
,	O
as	O
Karlsruhe	B-Algorithm
Accurate	I-Algorithm
Arithmetic	I-Algorithm
,	O
had	O
been	O
under	O
development	O
for	O
decades	O
,	O
was	O
implemented	O
as	O
an	O
optional	O
feature	O
on	O
the	O
4361	O
.	O
</s>
<s>
supported	O
the	O
4300	O
series	O
as	O
well	O
as	O
other	O
System/370	B-Device
-compatible	O
processors	O
.	O
</s>
<s>
Small	O
Systems	O
Executive/Virtual	O
Storage	O
Extended	O
(	O
SSX/VSE	O
)	O
,	O
a	O
simplified	O
version	O
of	O
the	O
DOS/VSE	B-Application
operating	O
system	O
for	O
the	O
IBM	O
4321	O
and	O
IBM	O
4331	O
processors	O
.	O
</s>
