<s>
The	O
IBM	B-Device
System/360	I-Device
Model	I-Device
44	I-Device
is	O
a	O
specialized	O
member	O
of	O
the	O
IBM	B-Application
System/360	I-Application
family	O
,	O
with	O
a	O
variant	O
of	O
the	O
System/360	B-Application
computer	B-General_Concept
architecture	I-General_Concept
,	O
designed	O
for	O
scientific	O
computing	O
,	O
real-time	B-General_Concept
computing	I-General_Concept
,	O
process	O
control	O
and	O
numerical	O
control	O
(	O
NC	O
)	O
.	O
</s>
<s>
The	O
base	O
Model	O
44	O
lacks	O
the	O
storage-to-storage	O
character	O
and	O
decimal	O
instruction	O
sets	O
of	O
a	O
standard	O
System/360	B-Application
,	O
however	O
an	O
"	O
extended	O
instruction	O
set	O
"	O
feature	O
was	O
available	O
to	O
provide	O
the	O
missing	O
instructions	O
.	O
</s>
<s>
The	O
system	O
comes	O
with	O
four	O
memory	O
sizes	O
:	O
E	O
(	O
32KiB	O
)	O
,	O
F	O
(	O
64KiB	O
)	O
,	O
G	O
(	O
128KiB	O
)	O
,	O
and	O
H	O
(	O
256KiB	O
)	O
,	O
with	O
an	O
access	O
time	O
of	O
1μs	O
,	O
which	O
puts	O
it	O
closer	O
to	O
the	O
Model	B-Device
65	I-Device
(	O
.75μs	O
)	O
than	O
the	O
Model	B-Device
50	I-Device
(	O
2.0μs	O
)	O
.	O
</s>
<s>
General	B-General_Concept
purpose	I-General_Concept
registers	I-General_Concept
are	O
normally	O
located	O
in	O
a	O
non-addressable	O
portion	O
of	O
1μs	O
core	O
storage	O
termed	O
"	O
bump	O
storage	O
"	O
.	O
</s>
<s>
For	O
added	O
speed	O
,	O
the	O
general	B-General_Concept
purpose	I-General_Concept
registers	I-General_Concept
can	O
be	O
implemented	O
in	O
Solid	B-Algorithm
Logic	I-Algorithm
Technology	I-Algorithm
(	O
SLT	O
)	O
circuitry	O
with	O
an	O
access	O
time	O
of	O
.25μs	O
.	O
</s>
<s>
It	O
has	O
the	O
same	O
short	O
floating-point	O
instructions	O
and	O
long	O
floating-point	O
instructions	O
as	O
the	O
other	O
models	O
in	O
the	O
System/360	B-Application
line	O
,	O
but	O
it	O
also	O
has	O
a	O
rotary	O
switch	O
on	O
the	O
front	O
panel	O
which	O
can	O
be	O
used	O
to	O
set	O
the	O
precision	O
of	O
long	O
floating-point	O
numbers	O
.	O
</s>
<s>
This	O
differs	O
from	O
the	O
standard	O
System/360	B-Application
direct	O
control	O
feature	O
which	O
transfers	O
a	O
single	O
byte	O
.	O
</s>
<s>
Controlled	O
by	O
standard	O
System/360	B-Application
I/O	O
instructions	O
and	O
commands	O
,	O
it	O
allows	O
the	O
connection	O
of	O
external	O
devices	O
that	O
perform	O
word-by-word	O
data	O
transfers	O
with	O
the	O
Model	O
44	O
CPU	O
at	O
transfer	O
rates	O
up	O
to	O
4MiB/s	O
.	O
</s>
<s>
The	O
Model	O
44	O
can	O
support	O
up	O
to	O
one	O
standard	O
and	O
two	O
high-speed	O
System/360	B-Application
multiplexer	O
channels	O
in	O
addition	O
to	O
integrated	O
adapters	O
for	O
the	O
single	O
disk	O
storage	O
and	O
the	O
console	O
1052	B-Device
printer/keyboard	I-Device
.	O
</s>
<s>
The	O
Model	O
44	O
Programming	O
System	O
software	O
includes	O
a	O
supervisor	O
,	O
utility	B-Application
programs	I-Application
,	O
assembler	B-Device
,	O
FORTRAN	B-Application
IV	O
compiler	O
,	O
and	O
a	O
library	O
of	O
scientific	O
subroutines	O
.	O
</s>
